Merge branch 'main' into feature/tldr-on-empty-response

Makefile

@@ -204,6 +204,44 @@ check: deps fmt vet test
 run: build
 	@$(BUILD_DIR)/$(BINARY_NAME) $(ARGS)
 
+## docker-build: Build Docker image (minimal Alpine-based)
+docker-build:
+	@echo "Building minimal Docker image (Alpine-based)..."
+	docker compose -f docker/docker-compose.yml build picoclaw-agent picoclaw-gateway
+
+## docker-build-full: Build Docker image with full MCP support (Node.js 24)
+docker-build-full:
+	@echo "Building full-featured Docker image (Node.js 24)..."
+	docker compose -f docker/docker-compose.full.yml build picoclaw-agent picoclaw-gateway
+
+## docker-test: Test MCP tools in Docker container
+docker-test:
+	@echo "Testing MCP tools in Docker..."
+	@chmod +x scripts/test-docker-mcp.sh
+	@./scripts/test-docker-mcp.sh
+
+## docker-run: Run picoclaw gateway in Docker (Alpine-based)
+docker-run:
+	docker compose -f docker/docker-compose.yml --profile gateway up
+
+## docker-run-full: Run picoclaw gateway in Docker (full-featured)
+docker-run-full:
+	docker compose -f docker/docker-compose.full.yml --profile gateway up
+
+## docker-run-agent: Run picoclaw agent in Docker (interactive, Alpine-based)
+docker-run-agent:
+	docker compose -f docker/docker-compose.yml run --rm picoclaw-agent
+
+## docker-run-agent-full: Run picoclaw agent in Docker (interactive, full-featured)
+docker-run-agent-full:
+	docker compose -f docker/docker-compose.full.yml run --rm picoclaw-agent
+
+## docker-clean: Clean Docker images and volumes
+docker-clean:
+	docker compose -f docker/docker-compose.yml down -v
+	docker compose -f docker/docker-compose.full.yml down -v
+	docker rmi picoclaw:latest picoclaw:full 2>/dev/null || true
+
 ## help: Show this help message
 help:
 	@echo "picoclaw Makefile"
@@ -219,6 +257,8 @@ help:
 	@echo "  make install            # Install to ~/.local/bin"
 	@echo "  make uninstall          # Remove from /usr/local/bin"
 	@echo "  make install-skills     # Install skills to workspace"
+	@echo "  make docker-build       # Build minimal Docker image"
+	@echo "  make docker-test        # Test MCP tools in Docker"
 	@echo ""
 	@echo "Environment Variables:"
 	@echo "  INSTALL_PREFIX          # Installation prefix (default: ~/.local)"

README.md

@@ -721,6 +721,20 @@ PicoClaw stores data in your configured workspace (default: `~/.picoclaw/workspa
 └── USER.md           # User preferences
 ```
 
+### Skill Sources
+
+By default, skills are loaded from:
+
+1. `~/.picoclaw/workspace/skills` (workspace)
+2. `~/.picoclaw/skills` (global)
+3. `<current-working-directory>/skills` (builtin)
+
+For advanced/test setups, you can override the builtin skills root with:
+
+```bash
+export PICOCLAW_BUILTIN_SKILLS=/path/to/skills
+```
+
 ### 🔒 Security Sandbox
 
 PicoClaw runs in a sandboxed environment by default. The agent can only access files and execute commands within the configured workspace.
@@ -925,7 +939,7 @@ This design also enables **multi-agent support** with flexible provider selectio
 #### 📋 All Supported Vendors
 
 | Vendor              | `model` Prefix    | Default API Base                                    | Protocol  | API Key                                                          |
-| ------------------- | ----------------- | --------------------------------------------------- | --------- | ---------------------------------------------------------------- |
+| ------------------- | ----------------- |-----------------------------------------------------| --------- | ---------------------------------------------------------------- |
 | **OpenAI**          | `openai/`         | `https://api.openai.com/v1`                         | OpenAI    | [Get Key](https://platform.openai.com)                           |
 | **Anthropic**       | `anthropic/`      | `https://api.anthropic.com/v1`                      | Anthropic | [Get Key](https://console.anthropic.com)                         |
 | **智谱 AI (GLM)**   | `zhipu/`          | `https://open.bigmodel.cn/api/paas/v4`              | OpenAI    | [Get Key](https://open.bigmodel.cn/usercenter/proj-mgmt/apikeys) |
@@ -937,6 +951,7 @@ This design also enables **multi-agent support** with flexible provider selectio
 | **NVIDIA**          | `nvidia/`         | `https://integrate.api.nvidia.com/v1`               | OpenAI    | [Get Key](https://build.nvidia.com)                              |
 | **Ollama**          | `ollama/`         | `http://localhost:11434/v1`                         | OpenAI    | Local (no key needed)                                            |
 | **OpenRouter**      | `openrouter/`     | `https://openrouter.ai/api/v1`                      | OpenAI    | [Get Key](https://openrouter.ai/keys)                            |
+| **LiteLLM Proxy**   | `litellm/`        | `http://localhost:4000/v1                           | OpenAI    | Your LiteLLM proxy key                                            |
 | **VLLM**            | `vllm/`           | `http://localhost:8000/v1`                          | OpenAI    | Local                                                            |
 | **Cerebras**        | `cerebras/`       | `https://api.cerebras.ai/v1`                        | OpenAI    | [Get Key](https://cerebras.ai)                                   |
 | **火山引擎**        | `volcengine/`     | `https://ark.cn-beijing.volces.com/api/v3`          | OpenAI    | [Get Key](https://console.volcengine.com)                        |
@@ -1038,6 +1053,19 @@ This design also enables **multi-agent support** with flexible provider selectio
 }
 ```
 
+**LiteLLM Proxy**
+
+```json
+{
+  "model_name": "lite-gpt4",
+  "model": "litellm/lite-gpt4",
+  "api_base": "http://localhost:4000/v1",
+  "api_key": "sk-..."
+}
+```
+
+PicoClaw strips only the outer `litellm/` prefix before sending the request, so proxy aliases like `litellm/lite-gpt4` send `lite-gpt4`, while `litellm/openai/gpt-4o` sends `openai/gpt-4o`.
+
 #### Load Balancing
 
 Configure multiple endpoints for the same model name—PicoClaw will automatically round-robin between them:

README.zh.md

@@ -362,6 +362,20 @@ PicoClaw 将数据存储在您配置的工作区中（默认：`~/.picoclaw/work
 
 ```
 
+### 技能来源 (Skill Sources)
+
+默认情况下，技能会按以下顺序加载：
+
+1. `~/.picoclaw/workspace/skills`（工作区）
+2. `~/.picoclaw/skills`（全局）
+3. `<current-working-directory>/skills`（内置）
+
+在高级/测试场景下，可通过以下环境变量覆盖内置技能目录：
+
+```bash
+export PICOCLAW_BUILTIN_SKILLS=/path/to/skills
+```
+
 ### 心跳 / 周期性任务 (Heartbeat)
 
 PicoClaw 可以自动执行周期性任务。在工作区创建 `HEARTBEAT.md` 文件：

cmd/picoclaw-launcher-tui/internal/ui/style.go

@@ -5,6 +5,19 @@ import (
 	"github.com/rivo/tview"
 )
 
+const (
+	colorBlue = "[#3e5db9]"
+	colorRed  = "[#d54646]"
+	banner    = "\r\n[::b]" +
+		colorBlue + "██████╗ ██╗ ██████╗ ██████╗ " + colorRed + " ██████╗██╗      █████╗ ██╗    ██╗\n" +
+		colorBlue + "██╔══██╗██║██╔════╝██╔═══██╗" + colorRed + "██╔════╝██║     ██╔══██╗██║    ██║\n" +
+		colorBlue + "██████╔╝██║██║     ██║   ██║" + colorRed + "██║     ██║     ███████║██║ █╗ ██║\n" +
+		colorBlue + "██╔═══╝ ██║██║     ██║   ██║" + colorRed + "██║     ██║     ██╔══██║██║███╗██║\n" +
+		colorBlue + "██║     ██║╚██████╗╚██████╔╝" + colorRed + "╚██████╗███████╗██║  ██║╚███╔███╔╝\n" +
+		colorBlue + "╚═╝     ╚═╝ ╚═════╝ ╚═════╝ " + colorRed + " ╚═════╝╚══════╝╚═╝  ╚═╝ ╚══╝╚══╝\n " +
+		"[:]"
+)
+
 func applyStyles() {
 	tview.Styles.PrimitiveBackgroundColor = tcell.NewRGBColor(12, 13, 22)
 	tview.Styles.ContrastBackgroundColor = tcell.NewRGBColor(34, 19, 53)
@@ -24,14 +37,7 @@ func bannerView() *tview.TextView {
 	text.SetDynamicColors(true)
 	text.SetTextAlign(tview.AlignCenter)
 	text.SetBackgroundColor(tview.Styles.PrimitiveBackgroundColor)
-	text.SetText(
+	text.SetText(banner)
-		"[::b][#84aaff]██████╗ ██╗ ██████╗ ██████╗  ██████╗██╗      █████╗ ██╗    ██╗\n" +
-			"[#84aaff]██╔══██╗██║██╔════╝██╔═══██╗██╔════╝██║     ██╔══██╗██║    ██║\n" +
-			"[#84aaff]██████╔╝██║██║     ██║   ██║██║     ██║     ███████║██║ █╗ ██║\n" +
-			"[#84aaff]██╔═══╝ ██║██║     ██║   ██║██║     ██║     ██╔══██║██║███╗██║\n" +
-			"[#84aaff]██║     ██║╚██████╗╚██████╔╝╚██████╗███████╗██║  ██║╚███╔███╔╝\n" +
-			"[#84aaff]╚═╝     ╚═╝ ╚═════╝ ╚═════╝  ╚═════╝╚══════╝╚═╝  ╚═╝ ╚══╝╚══╝",
-	)
 	text.SetBorder(false)
 	return text
 }

cmd/picoclaw/main.go

@@ -48,7 +48,21 @@ func NewPicoclawCommand() *cobra.Command {
 	return cmd
 }
 
+const (
+	colorBlue = "\033[1;38;2;62;93;185m"
+	colorRed  = "\033[1;38;2;213;70;70m"
+	banner    = "\r\n" +
+		colorBlue + "██████╗ ██╗ ██████╗ ██████╗ " + colorRed + " ██████╗██╗      █████╗ ██╗    ██╗\n" +
+		colorBlue + "██╔══██╗██║██╔════╝██╔═══██╗" + colorRed + "██╔════╝██║     ██╔══██╗██║    ██║\n" +
+		colorBlue + "██████╔╝██║██║     ██║   ██║" + colorRed + "██║     ██║     ███████║██║ █╗ ██║\n" +
+		colorBlue + "██╔═══╝ ██║██║     ██║   ██║" + colorRed + "██║     ██║     ██╔══██║██║███╗██║\n" +
+		colorBlue + "██║     ██║╚██████╗╚██████╔╝" + colorRed + "╚██████╗███████╗██║  ██║╚███╔███╔╝\n" +
+		colorBlue + "╚═╝     ╚═╝ ╚═════╝ ╚═════╝ " + colorRed + " ╚═════╝╚══════╝╚═╝  ╚═╝ ╚══╝╚══╝\n " +
+		"\033[0m\r\n"
+)
+
 func main() {
+	fmt.Printf("%s", banner)
 	cmd := NewPicoclawCommand()
 	if err := cmd.Execute(); err != nil {
 		os.Exit(1)

config/config.example.json

@@ -49,6 +49,7 @@
     "telegram": {
       "enabled": false,
       "token": "YOUR_TELEGRAM_BOT_TOKEN",
+      "base_url": "",
       "proxy": "",
       "allow_from": [
         "YOUR_USER_ID"
@@ -243,6 +244,71 @@
     "cron": {
       "exec_timeout_minutes": 5
     },
+    "mcp": {
+      "enabled": false,
+      "servers": {
+        "context7": {
+          "enabled": false,
+          "type": "http",
+          "url": "https://mcp.context7.com/mcp",
+          "headers": {
+            "CONTEXT7_API_KEY": "ctx7sk-xx"
+          }
+        },
+        "filesystem": {
+          "enabled": false,
+          "command": "npx",
+          "args": [
+            "-y",
+            "@modelcontextprotocol/server-filesystem",
+            "/tmp"
+          ]
+        },
+        "github": {
+          "enabled": false,
+          "command": "npx",
+          "args": [
+            "-y",
+            "@modelcontextprotocol/server-github"
+          ],
+          "env": {
+            "GITHUB_PERSONAL_ACCESS_TOKEN": "YOUR_GITHUB_TOKEN"
+          }
+        },
+        "brave-search": {
+          "enabled": false,
+          "command": "npx",
+          "args": [
+            "-y",
+            "@modelcontextprotocol/server-brave-search"
+          ],
+          "env": {
+            "BRAVE_API_KEY": "YOUR_BRAVE_API_KEY"
+          }
+        },
+        "postgres": {
+          "enabled": false,
+          "command": "npx",
+          "args": [
+            "-y",
+            "@modelcontextprotocol/server-postgres",
+            "postgresql://user:password@localhost/dbname"
+          ]
+        },
+        "slack": {
+          "enabled": false,
+          "command": "npx",
+          "args": [
+            "-y",
+            "@modelcontextprotocol/server-slack"
+          ],
+          "env": {
+            "SLACK_BOT_TOKEN": "YOUR_SLACK_BOT_TOKEN",
+            "SLACK_TEAM_ID": "YOUR_SLACK_TEAM_ID"
+          }
+        }
+      }
+    },
     "exec": {
       "enable_deny_patterns": false,
       "custom_deny_patterns": []

docker/Dockerfile.full

@@ -0,0 +1,44 @@
+# ============================================================
+# Stage 1: Build the picoclaw binary
+# ============================================================
+FROM golang:1.26.0-alpine AS builder
+
+RUN apk add --no-cache git make
+
+WORKDIR /src
+
+# Cache dependencies
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source and build
+COPY . .
+RUN make build
+
+# ============================================================
+# Stage 2: Node.js-based runtime with full MCP support
+# ============================================================
+FROM node:24-alpine3.23
+
+# Install runtime dependencies
+RUN apk add --no-cache \
+  ca-certificates \
+  curl \
+  git \
+  python3 \
+  py3-pip
+
+# Install uv and symlink to system path
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh && \
+  ln -s /root/.local/bin/uv /usr/local/bin/uv && \
+  ln -s /root/.local/bin/uvx /usr/local/bin/uvx && \
+  uv --version
+
+# Copy binary
+COPY --from=builder /src/build/picoclaw /usr/local/bin/picoclaw
+
+# Create picoclaw home directory
+RUN /usr/local/bin/picoclaw onboard
+
+ENTRYPOINT ["picoclaw"]
+CMD ["gateway"]

docker/docker-compose.full.yml

@@ -0,0 +1,44 @@
+services:
+  # ─────────────────────────────────────────────
+  # PicoClaw Agent (one-shot query) - Full MCP Support
+  #   docker compose -f docker/docker-compose.full.yml run --rm picoclaw-agent -m "Hello"
+  # ─────────────────────────────────────────────
+  picoclaw-agent:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.full
+    container_name: picoclaw-agent-full
+    profiles:
+      - agent
+    volumes:
+      - ../config/config.json:/root/.picoclaw/config.json:ro
+      - picoclaw-workspace:/root/.picoclaw/workspace
+      - picoclaw-npm-cache:/root/.npm # npm cache for faster MCP server installs
+    entrypoint: ["picoclaw", "agent"]
+    stdin_open: true
+    tty: true
+
+  # ─────────────────────────────────────────────
+  # PicoClaw Gateway (Long-running Bot) - Full MCP Support
+  #   docker compose -f docker/docker-compose.full.yml --profile gateway up
+  # ─────────────────────────────────────────────
+  picoclaw-gateway:
+    build:
+      context: ..
+      dockerfile: docker/Dockerfile.full
+    container_name: picoclaw-gateway-full
+    restart: unless-stopped
+    profiles:
+      - gateway
+    volumes:
+      # Configuration file
+      - ../config/config.json:/root/.picoclaw/config.json:ro
+      # Persistent workspace (sessions, memory, logs)
+      - picoclaw-workspace:/root/.picoclaw/workspace
+      # NPM cache for faster MCP server installs
+      - picoclaw-npm-cache:/root/.npm
+    command: ["gateway"]
+
+volumes:
+  picoclaw-workspace:
+  picoclaw-npm-cache: # Cache npm packages to speed up MCP server installations

docs/tools_configuration.md

@@ -8,6 +8,7 @@ PicoClaw's tools configuration is located in the `tools` field of `config.json`.
 {
   "tools": {
     "web": { ... },
+    "mcp": { ... },
     "exec": { ... },
     "cron": { ... },
     "skills": { ... }
@@ -22,7 +23,7 @@ Web tools are used for web search and fetching.
 ### Brave
 
 | Config        | Type   | Default | Description               |
-|--------|------|---------|-------------|
+| ------------- | ------ | ------- | ------------------------- |
 | `enabled`     | bool   | false   | Enable Brave search       |
 | `api_key`     | string | -       | Brave Search API key      |
 | `max_results` | int    | 5       | Maximum number of results |
@@ -30,14 +31,14 @@ Web tools are used for web search and fetching.
 ### DuckDuckGo
 
 | Config        | Type | Default | Description               |
-|--------|------|---------|-------------|
+| ------------- | ---- | ------- | ------------------------- |
 | `enabled`     | bool | true    | Enable DuckDuckGo search  |
 | `max_results` | int  | 5       | Maximum number of results |
 
 ### Perplexity
 
 | Config        | Type   | Default | Description               |
-|--------|------|---------|-------------|
+| ------------- | ------ | ------- | ------------------------- |
 | `enabled`     | bool   | false   | Enable Perplexity search  |
 | `api_key`     | string | -       | Perplexity API key        |
 | `max_results` | int    | 5       | Maximum number of results |
@@ -47,7 +48,7 @@ Web tools are used for web search and fetching.
 The exec tool is used to execute shell commands.
 
 | Config                 | Type  | Default | Description                                |
-|--------|------|---------|-------------|
+| ---------------------- | ----- | ------- | ------------------------------------------ |
 | `enable_deny_patterns` | bool  | true    | Enable default dangerous command blocking  |
 | `custom_deny_patterns` | array | []      | Custom deny patterns (regular expressions) |
 
@@ -80,10 +81,7 @@ By default, PicoClaw blocks the following dangerous commands:
   "tools": {
     "exec": {
       "enable_deny_patterns": true,
-      "custom_deny_patterns": [
+      "custom_deny_patterns": ["\\brm\\s+-r\\b", "\\bkillall\\s+python"]
-        "\\brm\\s+-r\\b",
-        "\\bkillall\\s+python"
-      ]
     }
   }
 }
@@ -94,9 +92,84 @@ By default, PicoClaw blocks the following dangerous commands:
 The cron tool is used for scheduling periodic tasks.
 
 | Config                 | Type | Default | Description                                    |
-|--------|------|---------|-------------|
+| ---------------------- | ---- | ------- | ---------------------------------------------- |
 | `exec_timeout_minutes` | int  | 5       | Execution timeout in minutes, 0 means no limit |
 
+## MCP Tool
+
+The MCP tool enables integration with external Model Context Protocol servers.
+
+### Global Config
+
+| Config    | Type   | Default | Description                         |
+| --------- | ------ | ------- | ----------------------------------- |
+| `enabled` | bool   | false   | Enable MCP integration globally     |
+| `servers` | object | `{}`    | Map of server name to server config |
+
+### Per-Server Config
+
+| Config     | Type   | Required | Description                                |
+| ---------- | ------ | -------- | ------------------------------------------ |
+| `enabled`  | bool   | yes      | Enable this MCP server                     |
+| `type`     | string | no       | Transport type: `stdio`, `sse`, `http`     |
+| `command`  | string | stdio    | Executable command for stdio transport     |
+| `args`     | array  | no       | Command arguments for stdio transport      |
+| `env`      | object | no       | Environment variables for stdio process    |
+| `env_file` | string | no       | Path to environment file for stdio process |
+| `url`      | string | sse/http | Endpoint URL for `sse`/`http` transport    |
+| `headers`  | object | no       | HTTP headers for `sse`/`http` transport    |
+
+### Transport Behavior
+
+- If `type` is omitted, transport is auto-detected:
+  - `url` is set → `sse`
+  - `command` is set → `stdio`
+- `http` and `sse` both use `url` + optional `headers`.
+- `env` and `env_file` are only applied to `stdio` servers.
+
+### Configuration Examples
+
+#### 1) Stdio MCP server
+
+```json
+{
+  "tools": {
+    "mcp": {
+      "enabled": true,
+      "servers": {
+        "filesystem": {
+          "enabled": true,
+          "command": "npx",
+          "args": ["-y", "@modelcontextprotocol/server-filesystem", "/tmp"]
+        }
+      }
+    }
+  }
+}
+```
+
+#### 2) Remote SSE/HTTP MCP server
+
+```json
+{
+  "tools": {
+    "mcp": {
+      "enabled": true,
+      "servers": {
+        "remote-mcp": {
+          "enabled": true,
+          "type": "sse",
+          "url": "https://example.com/mcp",
+          "headers": {
+            "Authorization": "Bearer YOUR_TOKEN"
+          }
+        }
+      }
+    }
+  }
+}
+```
+
 ## Skills Tool
 
 The skills tool configures skill discovery and installation via registries like ClawHub.
@@ -104,7 +177,7 @@ The skills tool configures skill discovery and installation via registries like
 ### Registries
 
 | Config                             | Type   | Default              | Description             |
-|--------|------|---------|-------------|
+| ---------------------------------- | ------ | -------------------- | ----------------------- |
 | `registries.clawhub.enabled`       | bool   | true                 | Enable ClawHub registry |
 | `registries.clawhub.base_url`      | string | `https://clawhub.ai` | ClawHub base URL        |
 | `registries.clawhub.search_path`   | string | `/api/v1/search`     | Search API path         |
@@ -136,8 +209,10 @@ The skills tool configures skill discovery and installation via registries like
 All configuration options can be overridden via environment variables with the format `PICOCLAW_TOOLS_<SECTION>_<KEY>`:
 
 For example:
+
 - `PICOCLAW_TOOLS_WEB_BRAVE_ENABLED=true`
 - `PICOCLAW_TOOLS_EXEC_ENABLE_DENY_PATTERNS=false`
 - `PICOCLAW_TOOLS_CRON_EXEC_TIMEOUT_MINUTES=10`
+- `PICOCLAW_TOOLS_MCP_ENABLED=true`
 
-Note: Array-type environment variables are not currently supported and must be set via the config file.
+Note: Nested map-style config (for example `tools.mcp.servers.<name>.*`) is configured in `config.json` rather than environment variables.

go.mod

@@ -8,13 +8,16 @@ require (
 	github.com/bwmarrin/discordgo v0.29.0
 	github.com/caarlos0/env/v11 v11.3.1
 	github.com/chzyer/readline v1.5.1
+	github.com/gdamore/tcell/v2 v2.13.8
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/websocket v1.5.3
 	github.com/larksuite/oapi-sdk-go/v3 v3.5.3
 	github.com/mdp/qrterminal/v3 v3.2.1
+	github.com/modelcontextprotocol/go-sdk v1.3.0
 	github.com/mymmrac/telego v1.6.0
 	github.com/open-dingtalk/dingtalk-stream-sdk-go v0.9.1
 	github.com/openai/openai-go/v3 v3.22.0
+	github.com/rivo/tview v0.42.0
 	github.com/slack-go/slack v0.17.3
 	github.com/spf13/cobra v1.10.2
 	github.com/stretchr/testify v1.11.1
@@ -35,6 +38,7 @@ require (
 	github.com/elliotchance/orderedmap/v3 v3.1.0 // indirect
 	github.com/gdamore/encoding v1.0.1 // indirect
 	github.com/gdamore/tcell/v2 v2.13.8 // indirect
+	github.com/h2non/filetype v1.1.3 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect
@@ -43,7 +47,6 @@ require (
 	github.com/petermattis/goid v0.0.0-20260113132338-7c7de50cc741 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
-	github.com/rivo/tview v0.42.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/rs/zerolog v1.34.0 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
@@ -81,6 +84,7 @@ require (
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasthttp v1.69.0 // indirect
 	github.com/valyala/fastjson v1.6.7 // indirect
+	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
 	golang.org/x/arch v0.24.0 // indirect
 	golang.org/x/crypto v0.48.0 // indirect
 	golang.org/x/net v0.50.0 // indirect

go.sum

@@ -66,6 +66,8 @@ github.com/go-test/deep v1.1.1/go.mod h1:5C2ZWiW0ErCdrYzpqxLbTX7MG14M9iiw8DgHncV
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8=
+github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
 github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
@@ -96,6 +98,8 @@ github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aN
 github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/grbit/go-json v0.11.0 h1:bAbyMdYrYl/OjYsSqLH99N2DyQ291mHy726Mx+sYrnc=
 github.com/grbit/go-json v0.11.0/go.mod h1:IYpHsdybQ386+6g3VE6AXQ3uTGa5mquBme5/ZWmtzek=
+github.com/h2non/filetype v1.1.3 h1:FKkx9QbD7HR/zjK1Ia5XiBsq9zdLi5Kf3zGyFTAFkGg=
+github.com/h2non/filetype v1.1.3/go.mod h1:319b3zT68BvV+WRj7cwy856M2ehB3HqNOt6sy1HndBY=
 github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
 github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
@@ -130,6 +134,8 @@ github.com/mattn/go-sqlite3 v1.14.34 h1:3NtcvcUnFBPsuRcno8pUtupspG/GM+9nZ88zgJcp
 github.com/mattn/go-sqlite3 v1.14.34/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
 github.com/mdp/qrterminal/v3 v3.2.1 h1:6+yQjiiOsSuXT5n9/m60E54vdgFsw0zhADHhHLrFet4=
 github.com/mdp/qrterminal/v3 v3.2.1/go.mod h1:jOTmXvnBsMy5xqLniO0R++Jmjs2sTm9dFSuQ5kpz/SU=
+github.com/modelcontextprotocol/go-sdk v1.3.0 h1:gMfZkv3DzQF5q/DcQePo5rahEY+sguyPfXDfNBcT0Zs=
+github.com/modelcontextprotocol/go-sdk v1.3.0/go.mod h1:AnQ//Qc6+4nIyyrB4cxBU7UW9VibK4iOZBeyP/rF1IE=
 github.com/mymmrac/telego v1.6.0 h1:Zc8rgyHozvd/7ZgyrigyHdAF9koHYMfilYfyB6wlFC0=
 github.com/mymmrac/telego v1.6.0/go.mod h1:xt6ZWA8zi8KmuzryE1ImEdl9JSwjHNpM4yhC7D8hU4Y=
 github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
@@ -212,6 +218,8 @@ github.com/vektah/gqlparser/v2 v2.5.27 h1:RHPD3JOplpk5mP5JGX8RKZkt2/Vwj/PZv0HxTd
 github.com/vektah/gqlparser/v2 v2.5.27/go.mod h1:D1/VCZtV3LPnQrcPBeR/q5jkSQIPti0uYCP/RI0gIeo=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
 github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
+github.com/yosida95/uritemplate/v3 v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zIM+UJPGz4=
+github.com/yosida95/uritemplate/v3 v3.0.2/go.mod h1:ILOh0sOhIJR3+L/8afwt/kE++YT040gmv5BQTMR2HP4=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=

pkg/agent/context.go

@@ -34,6 +34,11 @@ type ContextBuilder struct {
 	// created (didn't exist at cache time, now exist) or deleted (existed at
 	// cache time, now gone) — both of which should trigger a cache rebuild.
 	existedAtCache map[string]bool
+
+	// skillFilesAtCache snapshots the skill tree file set and mtimes at cache
+	// build time. This catches nested file creations/deletions/mtime changes
+	// that may not update the top-level skill root directory mtime.
+	skillFilesAtCache map[string]time.Time
 }
 
 func getGlobalConfigDir() string {
@@ -47,8 +52,11 @@ func getGlobalConfigDir() string {
 func NewContextBuilder(workspace string) *ContextBuilder {
 	// builtin skills: skills directory in current project
 	// Use the skills/ directory under the current working directory
+	builtinSkillsDir := strings.TrimSpace(os.Getenv("PICOCLAW_BUILTIN_SKILLS"))
+	if builtinSkillsDir == "" {
 		wd, _ := os.Getwd()
-	builtinSkillsDir := filepath.Join(wd, "skills")
+		builtinSkillsDir = filepath.Join(wd, "skills")
+	}
 	globalSkillsDir := filepath.Join(getGlobalConfigDir(), "skills")
 
 	return &ContextBuilder{
@@ -148,6 +156,7 @@ func (cb *ContextBuilder) BuildSystemPromptWithCache() string {
 	cb.cachedSystemPrompt = prompt
 	cb.cachedAt = baseline.maxMtime
 	cb.existedAtCache = baseline.existed
+	cb.skillFilesAtCache = baseline.skillFiles
 
 	logger.DebugCF("agent", "System prompt cached",
 		map[string]any{
@@ -167,14 +176,14 @@ func (cb *ContextBuilder) InvalidateCache() {
 	cb.cachedSystemPrompt = ""
 	cb.cachedAt = time.Time{}
 	cb.existedAtCache = nil
+	cb.skillFilesAtCache = nil
 
 	logger.DebugCF("agent", "System prompt cache invalidated", nil)
 }
 
-// sourcePaths returns the workspace source file paths tracked for cache
+// sourcePaths returns non-skill workspace source files tracked for cache
-// invalidation (bootstrap files + memory). The skills directory is handled
+// invalidation (bootstrap files + memory). Skill roots are handled separately
-// separately in sourceFilesChangedLocked because it requires both directory-
+// because they require both directory-level and recursive file-level checks.
-// level and recursive file-level mtime checks.
 func (cb *ContextBuilder) sourcePaths() []string {
 	return []string{
 		filepath.Join(cb.workspace, "AGENTS.md"),
@@ -185,10 +194,25 @@ func (cb *ContextBuilder) sourcePaths() []string {
 	}
 }
 
+// skillRoots returns all skill root directories that can affect
+// BuildSkillsSummary output (workspace/global/builtin).
+func (cb *ContextBuilder) skillRoots() []string {
+	if cb.skillsLoader == nil {
+		return []string{filepath.Join(cb.workspace, "skills")}
+	}
+
+	roots := cb.skillsLoader.SkillRoots()
+	if len(roots) == 0 {
+		return []string{filepath.Join(cb.workspace, "skills")}
+	}
+	return roots
+}
+
 // cacheBaseline holds the file existence snapshot and the latest observed
 // mtime across all tracked paths. Used as the cache reference point.
 type cacheBaseline struct {
 	existed    map[string]bool
+	skillFiles map[string]time.Time
 	maxMtime   time.Time
 }
 
@@ -196,12 +220,13 @@ type cacheBaseline struct {
 // the latest mtime across all tracked files + skills directory contents.
 // Called under write lock when the cache is built.
 func (cb *ContextBuilder) buildCacheBaseline() cacheBaseline {
-	skillsDir := filepath.Join(cb.workspace, "skills")
+	skillRoots := cb.skillRoots()
 
-	// All paths whose existence we track: source files + skills dir.
+	// All paths whose existence we track: source files + all skill roots.
-	allPaths := append(cb.sourcePaths(), skillsDir)
+	allPaths := append(cb.sourcePaths(), skillRoots...)
 
 	existed := make(map[string]bool, len(allPaths))
+	skillFiles := make(map[string]time.Time)
 	var maxMtime time.Time
 
 	for _, p := range allPaths {
@@ -212,17 +237,21 @@ func (cb *ContextBuilder) buildCacheBaseline() cacheBaseline {
 		}
 	}
 
-	// Walk skills files to capture their mtimes too.
+	// Walk all skill roots recursively to snapshot skill files and mtimes.
-	// Use os.Stat (not d.Info) to match the stat method used in
+	// Use os.Stat (not d.Info) for consistency with sourceFilesChanged checks.
-	// fileChangedSince / skillFilesModifiedSince for consistency.
+	for _, root := range skillRoots {
-	_ = filepath.WalkDir(skillsDir, func(path string, d fs.DirEntry, walkErr error) error {
+		_ = filepath.WalkDir(root, func(path string, d fs.DirEntry, walkErr error) error {
 			if walkErr == nil && !d.IsDir() {
-			if info, err := os.Stat(path); err == nil && info.ModTime().After(maxMtime) {
+				if info, err := os.Stat(path); err == nil {
+					skillFiles[path] = info.ModTime()
+					if info.ModTime().After(maxMtime) {
 						maxMtime = info.ModTime()
 					}
 				}
+			}
 			return nil
 		})
+	}
 
 	// If no tracked files exist yet (empty workspace), maxMtime is zero.
 	// Use a very old non-zero time so that:
@@ -234,7 +263,7 @@ func (cb *ContextBuilder) buildCacheBaseline() cacheBaseline {
 		maxMtime = time.Unix(1, 0)
 	}
 
-	return cacheBaseline{existed: existed, maxMtime: maxMtime}
+	return cacheBaseline{existed: existed, skillFiles: skillFiles, maxMtime: maxMtime}
 }
 
 // sourceFilesChangedLocked checks whether any workspace source file has been
@@ -254,21 +283,17 @@ func (cb *ContextBuilder) sourceFilesChangedLocked() bool {
 		return true
 	}
 
-	// --- Skills directory (handled separately from sourcePaths) ---
+	// --- Skill roots (workspace/global/builtin) ---
 	//
-	// 1. Creation/deletion: tracked via existedAtCache, same as bootstrap files.
+	// For each root:
-	skillsDir := filepath.Join(cb.workspace, "skills")
+	// 1. Creation/deletion and root directory mtime changes are tracked by fileChangedSince.
-	if cb.fileChangedSince(skillsDir) {
+	// 2. Nested file create/delete/mtime changes are tracked by the skill file snapshot.
+	for _, root := range cb.skillRoots() {
+		if cb.fileChangedSince(root) {
 			return true
 		}
-
+	}
-	// 2. Structural changes (add/remove entries inside the dir) are reflected
+	if skillFilesChangedSince(cb.skillRoots(), cb.skillFilesAtCache) {
-	//    in the directory's own mtime, which fileChangedSince already checks.
-	//
-	// 3. Content-only edits to files inside skills/ do NOT update the parent
-	//    directory mtime on most filesystems, so we recursively walk to check
-	//    individual file mtimes at any nesting depth.
-	if skillFilesModifiedSince(skillsDir, cb.cachedAt) {
 		return true
 	}
 
@@ -309,28 +334,64 @@ func (cb *ContextBuilder) fileChangedSince(path string) bool {
 // if the callback returned nil when its err parameter is non-nil.
 var errWalkStop = errors.New("walk stop")
 
-// skillFilesModifiedSince recursively walks the skills directory and checks
+// skillFilesChangedSince compares the current recursive skill file tree
-// whether any file was modified after t. This catches content-only edits at
+// against the cache-time snapshot. Any create/delete/mtime drift invalidates
-// any nesting depth (e.g. skills/name/docs/extra.md) that don't update
+// the cache.
-// parent directory mtimes.
+func skillFilesChangedSince(skillRoots []string, filesAtCache map[string]time.Time) bool {
-func skillFilesModifiedSince(skillsDir string, t time.Time) bool {
+	// Defensive: if the snapshot was never initialized, force rebuild.
-	changed := false
+	if filesAtCache == nil {
-	err := filepath.WalkDir(skillsDir, func(path string, d fs.DirEntry, walkErr error) error {
+		return true
-		if walkErr == nil && !d.IsDir() {
-			if info, statErr := os.Stat(path); statErr == nil && info.ModTime().After(t) {
-				changed = true
-				return errWalkStop // stop walking
 	}
+
+	// Check cached files still exist and keep the same mtime.
+	for path, cachedMtime := range filesAtCache {
+		info, err := os.Stat(path)
+		if err != nil {
+			// A previously tracked file disappeared (or became inaccessible):
+			// either way, cached skill summary may now be stale.
+			return true
+		}
+		if !info.ModTime().Equal(cachedMtime) {
+			return true
+		}
+	}
+
+	// Check no new files appeared under any skill root.
+	changed := false
+	for _, root := range skillRoots {
+		if strings.TrimSpace(root) == "" {
+			continue
+		}
+
+		err := filepath.WalkDir(root, func(path string, d fs.DirEntry, walkErr error) error {
+			if walkErr != nil {
+				// Treat unexpected walk errors as changed to avoid stale cache.
+				if !os.IsNotExist(walkErr) {
+					changed = true
+					return errWalkStop
+				}
+				return nil
+			}
+			if d.IsDir() {
+				return nil
+			}
+			if _, ok := filesAtCache[path]; !ok {
+				changed = true
+				return errWalkStop
 			}
 			return nil
 		})
-	// errWalkStop is expected (early exit on first changed file).
+
-	// os.IsNotExist means the skills dir doesn't exist yet — not an error.
+		if changed {
-	// Any other error is unexpected and worth logging.
+			return true
+		}
 		if err != nil && !errors.Is(err, errWalkStop) && !os.IsNotExist(err) {
 			logger.DebugCF("agent", "skills walk error", map[string]any{"error": err.Error()})
+			return true
 		}
-	return changed
+	}
+
+	return false
 }
 
 func (cb *ContextBuilder) LoadBootstrapFiles() string {
@@ -466,10 +527,14 @@ func (cb *ContextBuilder) BuildMessages(
 
 	// Add current user message
 	if strings.TrimSpace(currentMessage) != "" {
-		messages = append(messages, providers.Message{
+		msg := providers.Message{
 			Role:    "user",
 			Content: currentMessage,
-		})
+		}
+		if len(media) > 0 {
+			msg.Media = media
+		}
+		messages = append(messages, msg)
 	}
 
 	return messages

pkg/agent/context_cache_test.go

@@ -383,6 +383,162 @@ Updated content.`
 	}
 }
 
+// TestGlobalSkillFileContentChange verifies that modifying a global skill
+// (~/.picoclaw/skills) invalidates the cached system prompt.
+func TestGlobalSkillFileContentChange(t *testing.T) {
+	tmpHome := t.TempDir()
+	t.Setenv("HOME", tmpHome)
+
+	tmpDir := setupWorkspace(t, nil)
+	defer os.RemoveAll(tmpDir)
+
+	globalSkillPath := filepath.Join(tmpHome, ".picoclaw", "skills", "global-skill", "SKILL.md")
+	if err := os.MkdirAll(filepath.Dir(globalSkillPath), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	v1 := `---
+name: global-skill
+description: global-v1
+---
+# Global Skill v1`
+	if err := os.WriteFile(globalSkillPath, []byte(v1), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	cb := NewContextBuilder(tmpDir)
+	sp1 := cb.BuildSystemPromptWithCache()
+	if !strings.Contains(sp1, "global-v1") {
+		t.Fatal("expected initial prompt to contain global skill description")
+	}
+
+	v2 := `---
+name: global-skill
+description: global-v2
+---
+# Global Skill v2`
+	if err := os.WriteFile(globalSkillPath, []byte(v2), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	future := time.Now().Add(2 * time.Second)
+	if err := os.Chtimes(globalSkillPath, future, future); err != nil {
+		t.Fatalf("failed to update mtime for %s: %v", globalSkillPath, err)
+	}
+
+	cb.systemPromptMutex.RLock()
+	changed := cb.sourceFilesChangedLocked()
+	cb.systemPromptMutex.RUnlock()
+	if !changed {
+		t.Fatal("sourceFilesChangedLocked() should detect global skill file content change")
+	}
+
+	sp2 := cb.BuildSystemPromptWithCache()
+	if !strings.Contains(sp2, "global-v2") {
+		t.Error("rebuilt prompt should contain updated global skill description")
+	}
+	if sp1 == sp2 {
+		t.Error("cache should be invalidated when global skill file content changes")
+	}
+}
+
+// TestBuiltinSkillFileContentChange verifies that modifying a builtin skill
+// invalidates the cached system prompt.
+func TestBuiltinSkillFileContentChange(t *testing.T) {
+	tmpHome := t.TempDir()
+	t.Setenv("HOME", tmpHome)
+
+	tmpDir := setupWorkspace(t, nil)
+	defer os.RemoveAll(tmpDir)
+
+	builtinRoot := t.TempDir()
+	t.Setenv("PICOCLAW_BUILTIN_SKILLS", builtinRoot)
+
+	builtinSkillPath := filepath.Join(builtinRoot, "builtin-skill", "SKILL.md")
+	if err := os.MkdirAll(filepath.Dir(builtinSkillPath), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	v1 := `---
+name: builtin-skill
+description: builtin-v1
+---
+# Builtin Skill v1`
+	if err := os.WriteFile(builtinSkillPath, []byte(v1), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	cb := NewContextBuilder(tmpDir)
+	sp1 := cb.BuildSystemPromptWithCache()
+	if !strings.Contains(sp1, "builtin-v1") {
+		t.Fatal("expected initial prompt to contain builtin skill description")
+	}
+
+	v2 := `---
+name: builtin-skill
+description: builtin-v2
+---
+# Builtin Skill v2`
+	if err := os.WriteFile(builtinSkillPath, []byte(v2), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	future := time.Now().Add(2 * time.Second)
+	if err := os.Chtimes(builtinSkillPath, future, future); err != nil {
+		t.Fatalf("failed to update mtime for %s: %v", builtinSkillPath, err)
+	}
+
+	cb.systemPromptMutex.RLock()
+	changed := cb.sourceFilesChangedLocked()
+	cb.systemPromptMutex.RUnlock()
+	if !changed {
+		t.Fatal("sourceFilesChangedLocked() should detect builtin skill file content change")
+	}
+
+	sp2 := cb.BuildSystemPromptWithCache()
+	if !strings.Contains(sp2, "builtin-v2") {
+		t.Error("rebuilt prompt should contain updated builtin skill description")
+	}
+	if sp1 == sp2 {
+		t.Error("cache should be invalidated when builtin skill file content changes")
+	}
+}
+
+// TestSkillFileDeletionInvalidatesCache verifies that deleting a nested skill
+// file invalidates the cached system prompt.
+func TestSkillFileDeletionInvalidatesCache(t *testing.T) {
+	tmpDir := setupWorkspace(t, map[string]string{
+		"skills/delete-me/SKILL.md": `---
+name: delete-me
+description: delete-me-v1
+---
+# Delete Me`,
+	})
+	defer os.RemoveAll(tmpDir)
+
+	cb := NewContextBuilder(tmpDir)
+	sp1 := cb.BuildSystemPromptWithCache()
+	if !strings.Contains(sp1, "delete-me-v1") {
+		t.Fatal("expected initial prompt to contain skill description")
+	}
+
+	skillPath := filepath.Join(tmpDir, "skills", "delete-me", "SKILL.md")
+	if err := os.Remove(skillPath); err != nil {
+		t.Fatal(err)
+	}
+
+	cb.systemPromptMutex.RLock()
+	changed := cb.sourceFilesChangedLocked()
+	cb.systemPromptMutex.RUnlock()
+	if !changed {
+		t.Fatal("sourceFilesChangedLocked() should detect deleted skill file")
+	}
+
+	sp2 := cb.BuildSystemPromptWithCache()
+	if strings.Contains(sp2, "delete-me-v1") {
+		t.Error("rebuilt prompt should not contain deleted skill description")
+	}
+	if sp1 == sp2 {
+		t.Error("cache should be invalidated when skill file is deleted")
+	}
+}
+
 // TestConcurrentBuildSystemPromptWithCache verifies that multiple goroutines
 // can safely call BuildSystemPromptWithCache concurrently without producing
 // empty results, panics, or data races.

pkg/agent/loop.go

@@ -23,6 +23,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/constants"
 	"github.com/sipeed/picoclaw/pkg/logger"
+	"github.com/sipeed/picoclaw/pkg/mcp"
 	"github.com/sipeed/picoclaw/pkg/media"
 	"github.com/sipeed/picoclaw/pkg/providers"
 	"github.com/sipeed/picoclaw/pkg/routing"
@@ -50,6 +51,7 @@ type processOptions struct {
 	Channel         string   // Target channel for tool execution
 	ChatID          string   // Target chat ID for tool execution
 	UserMessage     string   // User message content (may include prefix)
+	Media           []string // media:// refs from inbound message
 	DefaultResponse string   // Response when LLM returns empty
 	EnableSummary   bool     // Whether to trigger summarization
 	SendResponse    bool     // Whether to send response via bus
@@ -58,7 +60,11 @@ type processOptions struct {
 
 const defaultResponse = "I've completed processing but have no response to give. Increase `max_tool_iterations` in config.json."
 
-func NewAgentLoop(cfg *config.Config, msgBus *bus.MessageBus, provider providers.LLMProvider) *AgentLoop {
+func NewAgentLoop(
+	cfg *config.Config,
+	msgBus *bus.MessageBus,
+	provider providers.LLMProvider,
+) *AgentLoop {
 	registry := NewAgentRegistry(cfg, provider)
 
 	// Register shared tools to all agents
@@ -170,6 +176,72 @@ func registerSharedTools(
 func (al *AgentLoop) Run(ctx context.Context) error {
 	al.running.Store(true)
 
+	// Initialize MCP servers for all agents
+	if al.cfg.Tools.MCP.Enabled {
+		mcpManager := mcp.NewManager()
+		// Ensure MCP connections are cleaned up on exit, regardless of initialization success
+		// This fixes resource leak when LoadFromMCPConfig partially succeeds then fails
+		defer func() {
+			if err := mcpManager.Close(); err != nil {
+				logger.ErrorCF("agent", "Failed to close MCP manager",
+					map[string]any{
+						"error": err.Error(),
+					})
+			}
+		}()
+
+		defaultAgent := al.registry.GetDefaultAgent()
+		var workspacePath string
+		if defaultAgent != nil && defaultAgent.Workspace != "" {
+			workspacePath = defaultAgent.Workspace
+		} else {
+			workspacePath = al.cfg.WorkspacePath()
+		}
+
+		if err := mcpManager.LoadFromMCPConfig(ctx, al.cfg.Tools.MCP, workspacePath); err != nil {
+			logger.WarnCF("agent", "Failed to load MCP servers, MCP tools will not be available",
+				map[string]any{
+					"error": err.Error(),
+				})
+		} else {
+			// Register MCP tools for all agents
+			servers := mcpManager.GetServers()
+			uniqueTools := 0
+			totalRegistrations := 0
+			agentIDs := al.registry.ListAgentIDs()
+			agentCount := len(agentIDs)
+
+			for serverName, conn := range servers {
+				uniqueTools += len(conn.Tools)
+				for _, tool := range conn.Tools {
+					for _, agentID := range agentIDs {
+						agent, ok := al.registry.GetAgent(agentID)
+						if !ok {
+							continue
+						}
+						mcpTool := tools.NewMCPTool(mcpManager, serverName, tool)
+						agent.Tools.Register(mcpTool)
+						totalRegistrations++
+						logger.DebugCF("agent", "Registered MCP tool",
+							map[string]any{
+								"agent_id": agentID,
+								"server":   serverName,
+								"tool":     tool.Name,
+								"name":     mcpTool.Name(),
+							})
+					}
+				}
+			}
+			logger.InfoCF("agent", "MCP tools registered successfully",
+				map[string]any{
+					"server_count":        len(servers),
+					"unique_tools":        uniqueTools,
+					"total_registrations": totalRegistrations,
+					"agent_count":         agentCount,
+				})
+		}
+	}
+
 	for al.running.Load() {
 		select {
 		case <-ctx.Done():
@@ -310,7 +382,10 @@ func (al *AgentLoop) RecordLastChatID(chatID string) error {
 	return al.state.SetLastChatID(chatID)
 }
 
-func (al *AgentLoop) ProcessDirect(ctx context.Context, content, sessionKey string) (string, error) {
+func (al *AgentLoop) ProcessDirect(
+	ctx context.Context,
+	content, sessionKey string,
+) (string, error) {
 	return al.ProcessDirectWithChannel(ctx, content, sessionKey, "cli", "direct")
 }
 
@@ -331,7 +406,10 @@ func (al *AgentLoop) ProcessDirectWithChannel(
 
 // ProcessHeartbeat processes a heartbeat request without session history.
 // Each heartbeat is independent and doesn't accumulate context.
-func (al *AgentLoop) ProcessHeartbeat(ctx context.Context, content, channel, chatID string) (string, error) {
+func (al *AgentLoop) ProcessHeartbeat(
+	ctx context.Context,
+	content, channel, chatID string,
+) (string, error) {
 	agent := al.registry.GetDefaultAgent()
 	if agent == nil {
 		return "", fmt.Errorf("no default agent for heartbeat")
@@ -356,13 +434,16 @@ func (al *AgentLoop) processMessage(ctx context.Context, msg bus.InboundMessage)
 	} else {
 		logContent = utils.Truncate(msg.Content, 80)
 	}
-	logger.InfoCF("agent", fmt.Sprintf("Processing message from %s:%s: %s", msg.Channel, msg.SenderID, logContent),
+	logger.InfoCF(
+		"agent",
+		fmt.Sprintf("Processing message from %s:%s: %s", msg.Channel, msg.SenderID, logContent),
 		map[string]any{
 			"channel":     msg.Channel,
 			"chat_id":     msg.ChatID,
 			"sender_id":   msg.SenderID,
 			"session_key": msg.SessionKey,
-		})
+		},
+	)
 
 	// Route system messages to processSystemMessage
 	if msg.Channel == "system" {
@@ -417,15 +498,22 @@ func (al *AgentLoop) processMessage(ctx context.Context, msg bus.InboundMessage)
 		Channel:         msg.Channel,
 		ChatID:          msg.ChatID,
 		UserMessage:     msg.Content,
+		Media:           msg.Media,
 		DefaultResponse: defaultResponse,
 		EnableSummary:   true,
 		SendResponse:    false,
 	})
 }
 
-func (al *AgentLoop) processSystemMessage(ctx context.Context, msg bus.InboundMessage) (string, error) {
+func (al *AgentLoop) processSystemMessage(
+	ctx context.Context,
+	msg bus.InboundMessage,
+) (string, error) {
 	if msg.Channel != "system" {
-		return "", fmt.Errorf("processSystemMessage called with non-system message channel: %s", msg.Channel)
+		return "", fmt.Errorf(
+			"processSystemMessage called with non-system message channel: %s",
+			msg.Channel,
+		)
 	}
 
 	logger.InfoCF("agent", "Processing system message",
@@ -483,14 +571,22 @@ func (al *AgentLoop) processSystemMessage(ctx context.Context, msg bus.InboundMe
 }
 
 // runAgentLoop is the core message processing logic.
-func (al *AgentLoop) runAgentLoop(ctx context.Context, agent *AgentInstance, opts processOptions) (string, error) {
+func (al *AgentLoop) runAgentLoop(
+	ctx context.Context,
+	agent *AgentInstance,
+	opts processOptions,
+) (string, error) {
 	// 0. Record last channel for heartbeat notifications (skip internal channels)
 	if opts.Channel != "" && opts.ChatID != "" {
 		// Don't record internal channels (cli, system, subagent)
 		if !constants.IsInternalChannel(opts.Channel) {
 			channelKey := fmt.Sprintf("%s:%s", opts.Channel, opts.ChatID)
 			if err := al.RecordLastChannel(channelKey); err != nil {
-				logger.WarnCF("agent", "Failed to record last channel", map[string]any{"error": err.Error()})
+				logger.WarnCF(
+					"agent",
+					"Failed to record last channel",
+					map[string]any{"error": err.Error()},
+				)
 			}
 		}
 	}
@@ -509,11 +605,15 @@ func (al *AgentLoop) runAgentLoop(ctx context.Context, agent *AgentInstance, opt
 		history,
 		summary,
 		opts.UserMessage,
-		nil,
+		opts.Media,
 		opts.Channel,
 		opts.ChatID,
 	)
 
+	// Resolve media:// refs to base64 data URLs (streaming)
+	maxMediaSize := al.cfg.Agents.Defaults.GetMaxMediaSize()
+	messages = resolveMediaRefs(messages, al.mediaStore, maxMediaSize)
+
 	// 3. Save user message to session
 	agent.Sessions.AddMessage(opts.SessionKey, "user", opts.UserMessage)
 
@@ -581,7 +681,10 @@ func (al *AgentLoop) targetReasoningChannelID(channelName string) (chatID string
 	return ""
 }
 
-func (al *AgentLoop) handleReasoning(ctx context.Context, reasoningContent, channelName, channelID string) {
+func (al *AgentLoop) handleReasoning(
+	ctx context.Context,
+	reasoningContent, channelName, channelID string,
+) {
 	if reasoningContent == "" || channelName == "" || channelID == "" {
 		return
 	}
@@ -675,22 +778,33 @@ func (al *AgentLoop) runLLMIteration(
 
 		callLLM := func() (*providers.LLMResponse, error) {
 			if len(agent.Candidates) > 1 && al.fallback != nil {
-				fbResult, fbErr := al.fallback.Execute(ctx, agent.Candidates,
+				fbResult, fbErr := al.fallback.Execute(
+					ctx,
+					agent.Candidates,
 					func(ctx context.Context, provider, model string) (*providers.LLMResponse, error) {
-						return agent.Provider.Chat(ctx, messages, providerToolDefs, model, map[string]any{
+						return agent.Provider.Chat(
+							ctx,
+							messages,
+							providerToolDefs,
+							model,
+							map[string]any{
 								"max_tokens":       agent.MaxTokens,
 								"temperature":      agent.Temperature,
 								"prompt_cache_key": agent.ID,
-						})
+							},
+						)
 					},
 				)
 				if fbErr != nil {
 					return nil, fbErr
 				}
 				if fbResult.Provider != "" && len(fbResult.Attempts) > 0 {
-					logger.InfoCF("agent", fmt.Sprintf("Fallback: succeeded with %s/%s after %d attempts",
+					logger.InfoCF(
+						"agent",
+						fmt.Sprintf("Fallback: succeeded with %s/%s after %d attempts",
 							fbResult.Provider, fbResult.Model, len(fbResult.Attempts)+1),
-						map[string]any{"agent_id": agent.ID, "iteration": iteration})
+						map[string]any{"agent_id": agent.ID, "iteration": iteration},
+					)
 				}
 				return fbResult.Response, nil
 			}
@@ -741,10 +855,14 @@ func (al *AgentLoop) runLLMIteration(
 			}
 
 			if isContextError && retry < maxRetries {
-				logger.WarnCF("agent", "Context window error detected, attempting compression", map[string]any{
+				logger.WarnCF(
+					"agent",
+					"Context window error detected, attempting compression",
+					map[string]any{
 						"error": err.Error(),
 						"retry": retry,
-				})
+					},
+				)
 
 				if retry == 0 && !constants.IsInternalChannel(opts.Channel) {
 					al.bus.PublishOutbound(ctx, bus.OutboundMessage{
@@ -776,7 +894,12 @@ func (al *AgentLoop) runLLMIteration(
 			return "", iteration, fmt.Errorf("LLM call failed after retries: %w", err)
 		}
 
-		go al.handleReasoning(ctx, response.Reasoning, opts.Channel, al.targetReasoningChannelID(opts.Channel))
+		go al.handleReasoning(
+			ctx,
+			response.Reasoning,
+			opts.Channel,
+			al.targetReasoningChannelID(opts.Channel),
+		)
 
 		logger.DebugCF("agent", "LLM response",
 			map[string]any{
@@ -1081,7 +1204,11 @@ func formatMessagesForLog(messages []providers.Message) string {
 			for _, tc := range msg.ToolCalls {
 				fmt.Fprintf(&sb, "    - ID: %s, Type: %s, Name: %s\n", tc.ID, tc.Type, tc.Name)
 				if tc.Function != nil {
-					fmt.Fprintf(&sb, "      Arguments: %s\n", utils.Truncate(tc.Function.Arguments, 200))
+					fmt.Fprintf(
+						&sb,
+						"      Arguments: %s\n",
+						utils.Truncate(tc.Function.Arguments, 200),
+					)
 				}
 			}
 		}
@@ -1110,7 +1237,11 @@ func formatToolsForLog(toolDefs []providers.ToolDefinition) string {
 		fmt.Fprintf(&sb, "  [%d] Type: %s, Name: %s\n", i, tool.Type, tool.Function.Name)
 		fmt.Fprintf(&sb, "      Description: %s\n", tool.Function.Description)
 		if len(tool.Function.Parameters) > 0 {
-			fmt.Fprintf(&sb, "      Parameters: %s\n", utils.Truncate(fmt.Sprintf("%v", tool.Function.Parameters), 200))
+			fmt.Fprintf(
+				&sb,
+				"      Parameters: %s\n",
+				utils.Truncate(fmt.Sprintf("%v", tool.Function.Parameters), 200),
+			)
 		}
 	}
 	sb.WriteString("]")
@@ -1207,7 +1338,9 @@ func (al *AgentLoop) summarizeBatch(
 	existingSummary string,
 ) (string, error) {
 	var sb strings.Builder
-	sb.WriteString("Provide a concise summary of this conversation segment, preserving core context and key points.\n")
+	sb.WriteString(
+		"Provide a concise summary of this conversation segment, preserving core context and key points.\n",
+	)
 	if existingSummary != "" {
 		sb.WriteString("Existing context: ")
 		sb.WriteString(existingSummary)

pkg/agent/loop_media.go

@@ -0,0 +1,122 @@
+// PicoClaw - Ultra-lightweight personal AI agent
+// Inspired by and based on nanobot: https://github.com/HKUDS/nanobot
+// License: MIT
+//
+// Copyright (c) 2026 PicoClaw contributors
+
+package agent
+
+import (
+	"bytes"
+	"encoding/base64"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/h2non/filetype"
+
+	"github.com/sipeed/picoclaw/pkg/logger"
+	"github.com/sipeed/picoclaw/pkg/media"
+	"github.com/sipeed/picoclaw/pkg/providers"
+)
+
+// resolveMediaRefs replaces media:// refs in message Media fields with base64 data URLs.
+// Uses streaming base64 encoding (file handle → encoder → buffer) to avoid holding
+// both raw bytes and encoded string in memory simultaneously.
+// Returns a new slice; original messages are not mutated.
+func resolveMediaRefs(messages []providers.Message, store media.MediaStore, maxSize int) []providers.Message {
+	if store == nil {
+		return messages
+	}
+
+	result := make([]providers.Message, len(messages))
+	copy(result, messages)
+
+	for i, m := range result {
+		if len(m.Media) == 0 {
+			continue
+		}
+
+		resolved := make([]string, 0, len(m.Media))
+		for _, ref := range m.Media {
+			if !strings.HasPrefix(ref, "media://") {
+				resolved = append(resolved, ref)
+				continue
+			}
+
+			localPath, meta, err := store.ResolveWithMeta(ref)
+			if err != nil {
+				logger.WarnCF("agent", "Failed to resolve media ref", map[string]any{
+					"ref":   ref,
+					"error": err.Error(),
+				})
+				continue
+			}
+
+			info, err := os.Stat(localPath)
+			if err != nil {
+				logger.WarnCF("agent", "Failed to stat media file", map[string]any{
+					"path":  localPath,
+					"error": err.Error(),
+				})
+				continue
+			}
+			if info.Size() > int64(maxSize) {
+				logger.WarnCF("agent", "Media file too large, skipping", map[string]any{
+					"path":     localPath,
+					"size":     info.Size(),
+					"max_size": maxSize,
+				})
+				continue
+			}
+
+			// Determine MIME type: prefer metadata, fallback to magic-bytes detection
+			mime := meta.ContentType
+			if mime == "" {
+				kind, ftErr := filetype.MatchFile(localPath)
+				if ftErr != nil || kind == filetype.Unknown {
+					logger.WarnCF("agent", "Unknown media type, skipping", map[string]any{
+						"path": localPath,
+					})
+					continue
+				}
+				mime = kind.MIME.Value
+			}
+
+			// Streaming base64: open file → base64 encoder → buffer
+			// Peak memory: ~1.33x file size (buffer only, no raw bytes copy)
+			f, err := os.Open(localPath)
+			if err != nil {
+				logger.WarnCF("agent", "Failed to open media file", map[string]any{
+					"path":  localPath,
+					"error": err.Error(),
+				})
+				continue
+			}
+
+			prefix := "data:" + mime + ";base64,"
+			encodedLen := base64.StdEncoding.EncodedLen(int(info.Size()))
+			var buf bytes.Buffer
+			buf.Grow(len(prefix) + encodedLen)
+			buf.WriteString(prefix)
+
+			encoder := base64.NewEncoder(base64.StdEncoding, &buf)
+			if _, err := io.Copy(encoder, f); err != nil {
+				f.Close()
+				logger.WarnCF("agent", "Failed to encode media file", map[string]any{
+					"path":  localPath,
+					"error": err.Error(),
+				})
+				continue
+			}
+			encoder.Close()
+			f.Close()
+
+			resolved = append(resolved, buf.String())
+		}
+
+		result[i].Media = resolved
+	}
+
+	return result
+}

pkg/agent/loop_test.go

@@ -6,12 +6,14 @@ import (
 	"os"
 	"path/filepath"
 	"slices"
+	"strings"
 	"testing"
 	"time"
 
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/channels"
 	"github.com/sipeed/picoclaw/pkg/config"
+	"github.com/sipeed/picoclaw/pkg/media"
 	"github.com/sipeed/picoclaw/pkg/providers"
 	"github.com/sipeed/picoclaw/pkg/tools"
 )
@@ -808,3 +810,142 @@ func TestHandleReasoning(t *testing.T) {
 		}
 	})
 }
+
+func TestResolveMediaRefs_ResolvesToBase64(t *testing.T) {
+	store := media.NewFileMediaStore()
+	dir := t.TempDir()
+
+	// Create a minimal valid PNG (8-byte header is enough for filetype detection)
+	pngPath := filepath.Join(dir, "test.png")
+	// PNG magic: 0x89 P N G \r \n 0x1A \n + minimal IHDR
+	pngHeader := []byte{
+		0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, // PNG signature
+		0x00, 0x00, 0x00, 0x0D, // IHDR length
+		0x49, 0x48, 0x44, 0x52, // "IHDR"
+		0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x08, 0x02, // 1x1 RGB
+		0x00, 0x00, 0x00, // no interlace
+		0x90, 0x77, 0x53, 0xDE, // CRC
+	}
+	if err := os.WriteFile(pngPath, pngHeader, 0o644); err != nil {
+		t.Fatal(err)
+	}
+	ref, err := store.Store(pngPath, media.MediaMeta{}, "test")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	messages := []providers.Message{
+		{Role: "user", Content: "describe this", Media: []string{ref}},
+	}
+	result := resolveMediaRefs(messages, store, config.DefaultMaxMediaSize)
+
+	if len(result[0].Media) != 1 {
+		t.Fatalf("expected 1 resolved media, got %d", len(result[0].Media))
+	}
+	if !strings.HasPrefix(result[0].Media[0], "data:image/png;base64,") {
+		t.Fatalf("expected data:image/png;base64, prefix, got %q", result[0].Media[0][:40])
+	}
+}
+
+func TestResolveMediaRefs_SkipsOversizedFile(t *testing.T) {
+	store := media.NewFileMediaStore()
+	dir := t.TempDir()
+
+	bigPath := filepath.Join(dir, "big.png")
+	// Write PNG header + padding to exceed limit
+	data := make([]byte, 1024+1) // 1KB + 1 byte
+	copy(data, []byte{0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A})
+	if err := os.WriteFile(bigPath, data, 0o644); err != nil {
+		t.Fatal(err)
+	}
+	ref, _ := store.Store(bigPath, media.MediaMeta{}, "test")
+
+	messages := []providers.Message{
+		{Role: "user", Content: "hi", Media: []string{ref}},
+	}
+	// Use a tiny limit (1KB) so the file is oversized
+	result := resolveMediaRefs(messages, store, 1024)
+
+	if len(result[0].Media) != 0 {
+		t.Fatalf("expected 0 media (oversized), got %d", len(result[0].Media))
+	}
+}
+
+func TestResolveMediaRefs_SkipsUnknownType(t *testing.T) {
+	store := media.NewFileMediaStore()
+	dir := t.TempDir()
+
+	txtPath := filepath.Join(dir, "readme.txt")
+	if err := os.WriteFile(txtPath, []byte("hello world"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	ref, _ := store.Store(txtPath, media.MediaMeta{}, "test")
+
+	messages := []providers.Message{
+		{Role: "user", Content: "hi", Media: []string{ref}},
+	}
+	result := resolveMediaRefs(messages, store, config.DefaultMaxMediaSize)
+
+	if len(result[0].Media) != 0 {
+		t.Fatalf("expected 0 media (unknown type), got %d", len(result[0].Media))
+	}
+}
+
+func TestResolveMediaRefs_PassesThroughNonMediaRefs(t *testing.T) {
+	messages := []providers.Message{
+		{Role: "user", Content: "hi", Media: []string{"https://example.com/img.png"}},
+	}
+	result := resolveMediaRefs(messages, nil, config.DefaultMaxMediaSize)
+
+	if len(result[0].Media) != 1 || result[0].Media[0] != "https://example.com/img.png" {
+		t.Fatalf("expected passthrough of non-media:// URL, got %v", result[0].Media)
+	}
+}
+
+func TestResolveMediaRefs_DoesNotMutateOriginal(t *testing.T) {
+	store := media.NewFileMediaStore()
+	dir := t.TempDir()
+	pngPath := filepath.Join(dir, "test.png")
+	pngHeader := []byte{
+		0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A,
+		0x00, 0x00, 0x00, 0x0D, 0x49, 0x48, 0x44, 0x52,
+		0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x08, 0x02,
+		0x00, 0x00, 0x00, 0x90, 0x77, 0x53, 0xDE,
+	}
+	os.WriteFile(pngPath, pngHeader, 0o644)
+	ref, _ := store.Store(pngPath, media.MediaMeta{}, "test")
+
+	original := []providers.Message{
+		{Role: "user", Content: "hi", Media: []string{ref}},
+	}
+	originalRef := original[0].Media[0]
+
+	resolveMediaRefs(original, store, config.DefaultMaxMediaSize)
+
+	if original[0].Media[0] != originalRef {
+		t.Fatal("resolveMediaRefs mutated original message slice")
+	}
+}
+
+func TestResolveMediaRefs_UsesMetaContentType(t *testing.T) {
+	store := media.NewFileMediaStore()
+	dir := t.TempDir()
+
+	// File with JPEG content but stored with explicit content type
+	jpegPath := filepath.Join(dir, "photo")
+	jpegHeader := []byte{0xFF, 0xD8, 0xFF, 0xE0} // JPEG magic bytes
+	os.WriteFile(jpegPath, jpegHeader, 0o644)
+	ref, _ := store.Store(jpegPath, media.MediaMeta{ContentType: "image/jpeg"}, "test")
+
+	messages := []providers.Message{
+		{Role: "user", Content: "hi", Media: []string{ref}},
+	}
+	result := resolveMediaRefs(messages, store, config.DefaultMaxMediaSize)
+
+	if len(result[0].Media) != 1 {
+		t.Fatalf("expected 1 media, got %d", len(result[0].Media))
+	}
+	if !strings.HasPrefix(result[0].Media[0], "data:image/jpeg;base64,") {
+		t.Fatalf("expected jpeg prefix, got %q", result[0].Media[0][:30])
+	}
+}

pkg/channels/feishu/common.go

@@ -1,5 +1,16 @@
 package feishu
 
+import (
+	"encoding/json"
+	"regexp"
+	"strings"
+
+	larkim "github.com/larksuite/oapi-sdk-go/v3/service/im/v1"
+)
+
+// mentionPlaceholderRegex matches @_user_N placeholders inserted by Feishu for mentions.
+var mentionPlaceholderRegex = regexp.MustCompile(`@_user_\d+`)
+
 // stringValue safely dereferences a *string pointer.
 func stringValue(v *string) string {
 	if v == nil {
@@ -7,3 +18,69 @@ func stringValue(v *string) string {
 	}
 	return *v
 }
+
+// buildMarkdownCard builds a Feishu Interactive Card JSON 2.0 string with markdown content.
+// JSON 2.0 cards support full CommonMark standard markdown syntax.
+func buildMarkdownCard(content string) (string, error) {
+	card := map[string]any{
+		"schema": "2.0",
+		"body": map[string]any{
+			"elements": []map[string]any{
+				{
+					"tag":     "markdown",
+					"content": content,
+				},
+			},
+		},
+	}
+	data, err := json.Marshal(card)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+// extractJSONStringField unmarshals content as JSON and returns the value of the given string field.
+// Returns "" if the content is invalid JSON or the field is missing/empty.
+func extractJSONStringField(content, field string) string {
+	var m map[string]json.RawMessage
+	if err := json.Unmarshal([]byte(content), &m); err != nil {
+		return ""
+	}
+	raw, ok := m[field]
+	if !ok {
+		return ""
+	}
+	var s string
+	if err := json.Unmarshal(raw, &s); err != nil {
+		return ""
+	}
+	return s
+}
+
+// extractImageKey extracts the image_key from a Feishu image message content JSON.
+// Format: {"image_key": "img_xxx"}
+func extractImageKey(content string) string { return extractJSONStringField(content, "image_key") }
+
+// extractFileKey extracts the file_key from a Feishu file/audio message content JSON.
+// Format: {"file_key": "file_xxx", "file_name": "...", ...}
+func extractFileKey(content string) string { return extractJSONStringField(content, "file_key") }
+
+// extractFileName extracts the file_name from a Feishu file message content JSON.
+func extractFileName(content string) string { return extractJSONStringField(content, "file_name") }
+
+// stripMentionPlaceholders removes @_user_N placeholders from the text content.
+// These are inserted by Feishu when users @mention someone in a message.
+func stripMentionPlaceholders(content string, mentions []*larkim.MentionEvent) string {
+	if len(mentions) == 0 {
+		return content
+	}
+	for _, m := range mentions {
+		if m.Key != nil && *m.Key != "" {
+			content = strings.ReplaceAll(content, *m.Key, "")
+		}
+	}
+	// Also clean up any remaining @_user_N patterns
+	content = mentionPlaceholderRegex.ReplaceAllString(content, "")
+	return strings.TrimSpace(content)
+}

pkg/channels/feishu/common_test.go

@@ -0,0 +1,292 @@
+package feishu
+
+import (
+	"encoding/json"
+	"testing"
+
+	larkim "github.com/larksuite/oapi-sdk-go/v3/service/im/v1"
+)
+
+func TestExtractJSONStringField(t *testing.T) {
+	tests := []struct {
+		name    string
+		content string
+		field   string
+		want    string
+	}{
+		{
+			name:    "valid field",
+			content: `{"image_key": "img_v2_xxx"}`,
+			field:   "image_key",
+			want:    "img_v2_xxx",
+		},
+		{
+			name:    "missing field",
+			content: `{"image_key": "img_v2_xxx"}`,
+			field:   "file_key",
+			want:    "",
+		},
+		{
+			name:    "invalid JSON",
+			content: `not json at all`,
+			field:   "image_key",
+			want:    "",
+		},
+		{
+			name:    "empty content",
+			content: "",
+			field:   "image_key",
+			want:    "",
+		},
+		{
+			name:    "non-string field value",
+			content: `{"count": 42}`,
+			field:   "count",
+			want:    "",
+		},
+		{
+			name:    "empty string value",
+			content: `{"image_key": ""}`,
+			field:   "image_key",
+			want:    "",
+		},
+		{
+			name:    "multiple fields",
+			content: `{"file_key": "file_xxx", "file_name": "test.pdf"}`,
+			field:   "file_name",
+			want:    "test.pdf",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractJSONStringField(tt.content, tt.field)
+			if got != tt.want {
+				t.Errorf("extractJSONStringField(%q, %q) = %q, want %q", tt.content, tt.field, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestExtractImageKey(t *testing.T) {
+	tests := []struct {
+		name    string
+		content string
+		want    string
+	}{
+		{
+			name:    "normal",
+			content: `{"image_key": "img_v2_abc123"}`,
+			want:    "img_v2_abc123",
+		},
+		{
+			name:    "missing key",
+			content: `{"file_key": "file_xxx"}`,
+			want:    "",
+		},
+		{
+			name:    "malformed JSON",
+			content: `{broken`,
+			want:    "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractImageKey(tt.content)
+			if got != tt.want {
+				t.Errorf("extractImageKey(%q) = %q, want %q", tt.content, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestExtractFileKey(t *testing.T) {
+	tests := []struct {
+		name    string
+		content string
+		want    string
+	}{
+		{
+			name:    "normal",
+			content: `{"file_key": "file_v2_abc123", "file_name": "test.doc"}`,
+			want:    "file_v2_abc123",
+		},
+		{
+			name:    "missing key",
+			content: `{"image_key": "img_xxx"}`,
+			want:    "",
+		},
+		{
+			name:    "malformed JSON",
+			content: `not json`,
+			want:    "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractFileKey(tt.content)
+			if got != tt.want {
+				t.Errorf("extractFileKey(%q) = %q, want %q", tt.content, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestExtractFileName(t *testing.T) {
+	tests := []struct {
+		name    string
+		content string
+		want    string
+	}{
+		{
+			name:    "normal",
+			content: `{"file_key": "file_xxx", "file_name": "report.pdf"}`,
+			want:    "report.pdf",
+		},
+		{
+			name:    "missing name",
+			content: `{"file_key": "file_xxx"}`,
+			want:    "",
+		},
+		{
+			name:    "malformed JSON",
+			content: `{bad`,
+			want:    "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractFileName(tt.content)
+			if got != tt.want {
+				t.Errorf("extractFileName(%q) = %q, want %q", tt.content, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestBuildMarkdownCard(t *testing.T) {
+	tests := []struct {
+		name    string
+		content string
+	}{
+		{
+			name:    "normal content",
+			content: "Hello **world**",
+		},
+		{
+			name:    "empty content",
+			content: "",
+		},
+		{
+			name:    "special characters",
+			content: `Code: "foo" & <bar> 'baz'`,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := buildMarkdownCard(tt.content)
+			if err != nil {
+				t.Fatalf("buildMarkdownCard(%q) unexpected error: %v", tt.content, err)
+			}
+
+			// Verify valid JSON
+			var parsed map[string]any
+			if err := json.Unmarshal([]byte(result), &parsed); err != nil {
+				t.Fatalf("buildMarkdownCard(%q) produced invalid JSON: %v", tt.content, err)
+			}
+
+			// Verify schema
+			if parsed["schema"] != "2.0" {
+				t.Errorf("schema = %v, want %q", parsed["schema"], "2.0")
+			}
+
+			// Verify body.elements[0].content == input
+			body, ok := parsed["body"].(map[string]any)
+			if !ok {
+				t.Fatal("missing body in card JSON")
+			}
+			elements, ok := body["elements"].([]any)
+			if !ok || len(elements) == 0 {
+				t.Fatal("missing or empty elements in card JSON")
+			}
+			elem, ok := elements[0].(map[string]any)
+			if !ok {
+				t.Fatal("first element is not an object")
+			}
+			if elem["tag"] != "markdown" {
+				t.Errorf("tag = %v, want %q", elem["tag"], "markdown")
+			}
+			if elem["content"] != tt.content {
+				t.Errorf("content = %v, want %q", elem["content"], tt.content)
+			}
+		})
+	}
+}
+
+func TestStripMentionPlaceholders(t *testing.T) {
+	strPtr := func(s string) *string { return &s }
+
+	tests := []struct {
+		name     string
+		content  string
+		mentions []*larkim.MentionEvent
+		want     string
+	}{
+		{
+			name:     "no mentions",
+			content:  "Hello world",
+			mentions: nil,
+			want:     "Hello world",
+		},
+		{
+			name:    "single mention",
+			content: "@_user_1 hello",
+			mentions: []*larkim.MentionEvent{
+				{Key: strPtr("@_user_1")},
+			},
+			want: "hello",
+		},
+		{
+			name:    "multiple mentions",
+			content: "@_user_1 @_user_2 hey",
+			mentions: []*larkim.MentionEvent{
+				{Key: strPtr("@_user_1")},
+				{Key: strPtr("@_user_2")},
+			},
+			want: "hey",
+		},
+		{
+			name:     "empty content",
+			content:  "",
+			mentions: []*larkim.MentionEvent{{Key: strPtr("@_user_1")}},
+			want:     "",
+		},
+		{
+			name:     "empty mentions slice",
+			content:  "@_user_1 test",
+			mentions: []*larkim.MentionEvent{},
+			want:     "@_user_1 test",
+		},
+		{
+			name:    "mention with nil key",
+			content: "@_user_1 test",
+			mentions: []*larkim.MentionEvent{
+				{Key: nil},
+			},
+			want: "test",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := stripMentionPlaceholders(tt.content, tt.mentions)
+			if got != tt.want {
+				t.Errorf("stripMentionPlaceholders(%q, ...) = %q, want %q", tt.content, got, tt.want)
+			}
+		})
+	}
+}

pkg/channels/feishu/feishu_32.go

@@ -16,6 +16,8 @@ type FeishuChannel struct {
 	*channels.BaseChannel
 }
 
+var errUnsupported = errors.New("feishu channel is not supported on 32-bit architectures")
+
 // NewFeishuChannel returns an error on 32-bit architectures where the Feishu SDK is not supported
 func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (*FeishuChannel, error) {
 	return nil, errors.New(
@@ -25,15 +27,35 @@ func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (*FeishuChan
 
 // Start is a stub method to satisfy the Channel interface
 func (c *FeishuChannel) Start(ctx context.Context) error {
-	return nil
+	return errUnsupported
 }
 
 // Stop is a stub method to satisfy the Channel interface
 func (c *FeishuChannel) Stop(ctx context.Context) error {
-	return nil
+	return errUnsupported
 }
 
 // Send is a stub method to satisfy the Channel interface
 func (c *FeishuChannel) Send(ctx context.Context, msg bus.OutboundMessage) error {
-	return errors.New("feishu channel is not supported on 32-bit architectures")
+	return errUnsupported
+}
+
+// EditMessage is a stub method to satisfy MessageEditor
+func (c *FeishuChannel) EditMessage(ctx context.Context, chatID, messageID, content string) error {
+	return errUnsupported
+}
+
+// SendPlaceholder is a stub method to satisfy PlaceholderCapable
+func (c *FeishuChannel) SendPlaceholder(ctx context.Context, chatID string) (string, error) {
+	return "", errUnsupported
+}
+
+// ReactToMessage is a stub method to satisfy ReactionCapable
+func (c *FeishuChannel) ReactToMessage(ctx context.Context, chatID, messageID string) (func(), error) {
+	return func() {}, errUnsupported
+}
+
+// SendMedia is a stub method to satisfy MediaSender
+func (c *FeishuChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessage) error {
+	return errUnsupported
 }

pkg/channels/feishu/feishu_64.go

@@ -6,10 +6,15 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
 	"sync"
-	"time"
+	"sync/atomic"
 
 	lark "github.com/larksuite/oapi-sdk-go/v3"
+	larkcore "github.com/larksuite/oapi-sdk-go/v3/core"
 	larkdispatcher "github.com/larksuite/oapi-sdk-go/v3/event/dispatcher"
 	larkim "github.com/larksuite/oapi-sdk-go/v3/service/im/v1"
 	larkws "github.com/larksuite/oapi-sdk-go/v3/ws"
@@ -19,6 +24,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/config"
 	"github.com/sipeed/picoclaw/pkg/identity"
 	"github.com/sipeed/picoclaw/pkg/logger"
+	"github.com/sipeed/picoclaw/pkg/media"
 	"github.com/sipeed/picoclaw/pkg/utils"
 )
 
@@ -28,6 +34,8 @@ type FeishuChannel struct {
 	client   *lark.Client
 	wsClient *larkws.Client
 
+	botOpenID atomic.Value // stores string; populated lazily for @mention detection
+
 	mu     sync.Mutex
 	cancel context.CancelFunc
 }
@@ -38,11 +46,13 @@ func NewFeishuChannel(cfg config.FeishuConfig, bus *bus.MessageBus) (*FeishuChan
 		channels.WithReasoningChannelID(cfg.ReasoningChannelID),
 	)
 
-	return &FeishuChannel{
+	ch := &FeishuChannel{
 		BaseChannel: base,
 		config:      cfg,
 		client:      lark.NewClient(cfg.AppID, cfg.AppSecret),
-	}, nil
+	}
+	ch.SetOwner(ch)
+	return ch, nil
 }
 
 func (c *FeishuChannel) Start(ctx context.Context) error {
@@ -50,6 +60,13 @@ func (c *FeishuChannel) Start(ctx context.Context) error {
 		return fmt.Errorf("feishu app_id or app_secret is empty")
 	}
 
+	// Fetch bot open_id via API for reliable @mention detection.
+	if err := c.fetchBotOpenID(ctx); err != nil {
+		logger.ErrorCF("feishu", "Failed to fetch bot open_id, @mention detection may not work", map[string]any{
+			"error": err.Error(),
+		})
+	}
+
 	dispatcher := larkdispatcher.NewEventDispatcher(c.config.VerificationToken, c.config.EncryptKey).
 		OnP2MessageReceiveV1(c.handleMessageReceive)
 
@@ -93,46 +110,213 @@ func (c *FeishuChannel) Stop(ctx context.Context) error {
 	return nil
 }
 
+// Send sends a message using Interactive Card format for markdown rendering.
 func (c *FeishuChannel) Send(ctx context.Context, msg bus.OutboundMessage) error {
 	if !c.IsRunning() {
 		return channels.ErrNotRunning
 	}
 
 	if msg.ChatID == "" {
-		return fmt.Errorf("chat ID is empty")
+		return fmt.Errorf("chat ID is empty: %w", channels.ErrSendFailed)
 	}
 
-	payload, err := json.Marshal(map[string]string{"text": msg.Content})
+	// Build interactive card with markdown content
+	cardContent, err := buildMarkdownCard(msg.Content)
 	if err != nil {
-		return fmt.Errorf("failed to marshal feishu content: %w", err)
+		return fmt.Errorf("feishu send: card build failed: %w", err)
+	}
+	return c.sendCard(ctx, msg.ChatID, cardContent)
+}
+
+// EditMessage implements channels.MessageEditor.
+// Uses Message.Patch to update an interactive card message.
+func (c *FeishuChannel) EditMessage(ctx context.Context, chatID, messageID, content string) error {
+	cardContent, err := buildMarkdownCard(content)
+	if err != nil {
+		return fmt.Errorf("feishu edit: card build failed: %w", err)
+	}
+
+	req := larkim.NewPatchMessageReqBuilder().
+		MessageId(messageID).
+		Body(larkim.NewPatchMessageReqBodyBuilder().Content(cardContent).Build()).
+		Build()
+
+	resp, err := c.client.Im.V1.Message.Patch(ctx, req)
+	if err != nil {
+		return fmt.Errorf("feishu edit: %w", err)
+	}
+	if !resp.Success() {
+		return fmt.Errorf("feishu edit api error (code=%d msg=%s)", resp.Code, resp.Msg)
+	}
+	return nil
+}
+
+// SendPlaceholder implements channels.PlaceholderCapable.
+// Sends an interactive card with placeholder text and returns its message ID.
+func (c *FeishuChannel) SendPlaceholder(ctx context.Context, chatID string) (string, error) {
+	if !c.config.Placeholder.Enabled {
+		logger.DebugCF("feishu", "Placeholder disabled, skipping", map[string]any{
+			"chat_id": chatID,
+		})
+		return "", nil
+	}
+
+	text := c.config.Placeholder.Text
+	if text == "" {
+		text = "Thinking..."
+	}
+
+	cardContent, err := buildMarkdownCard(text)
+	if err != nil {
+		return "", fmt.Errorf("feishu placeholder: card build failed: %w", err)
 	}
 
 	req := larkim.NewCreateMessageReqBuilder().
 		ReceiveIdType(larkim.ReceiveIdTypeChatId).
 		Body(larkim.NewCreateMessageReqBodyBuilder().
-			ReceiveId(msg.ChatID).
+			ReceiveId(chatID).
-			MsgType(larkim.MsgTypeText).
+			MsgType(larkim.MsgTypeInteractive).
-			Content(string(payload)).
+			Content(cardContent).
-			Uuid(fmt.Sprintf("picoclaw-%d", time.Now().UnixNano())).
 			Build()).
 		Build()
 
 	resp, err := c.client.Im.V1.Message.Create(ctx, req)
 	if err != nil {
-		return fmt.Errorf("feishu send: %w", channels.ErrTemporary)
+		return "", fmt.Errorf("feishu placeholder send: %w", err)
 	}
-
 	if !resp.Success() {
-		return fmt.Errorf("feishu api error (code=%d msg=%s): %w", resp.Code, resp.Msg, channels.ErrTemporary)
+		return "", fmt.Errorf("feishu placeholder api error (code=%d msg=%s)", resp.Code, resp.Msg)
 	}
 
-	logger.DebugCF("feishu", "Feishu message sent", map[string]any{
+	if resp.Data != nil && resp.Data.MessageId != nil {
-		"chat_id": msg.ChatID,
+		return *resp.Data.MessageId, nil
+	}
+	return "", nil
+}
+
+// ReactToMessage implements channels.ReactionCapable.
+// Adds an "Pin" reaction and returns an undo function to remove it.
+func (c *FeishuChannel) ReactToMessage(ctx context.Context, chatID, messageID string) (func(), error) {
+	req := larkim.NewCreateMessageReactionReqBuilder().
+		MessageId(messageID).
+		Body(larkim.NewCreateMessageReactionReqBodyBuilder().
+			ReactionType(larkim.NewEmojiBuilder().EmojiType("Pin").Build()).
+			Build()).
+		Build()
+
+	resp, err := c.client.Im.V1.MessageReaction.Create(ctx, req)
+	if err != nil {
+		logger.ErrorCF("feishu", "Failed to add reaction", map[string]any{
+			"message_id": messageID,
+			"error":      err.Error(),
 		})
+		return func() {}, fmt.Errorf("feishu react: %w", err)
+	}
+	if !resp.Success() {
+		logger.ErrorCF("feishu", "Reaction API error", map[string]any{
+			"message_id": messageID,
+			"code":       resp.Code,
+			"msg":        resp.Msg,
+		})
+		return func() {}, fmt.Errorf("feishu react api error (code=%d msg=%s)", resp.Code, resp.Msg)
+	}
+
+	var reactionID string
+	if resp.Data != nil && resp.Data.ReactionId != nil {
+		reactionID = *resp.Data.ReactionId
+	}
+	if reactionID == "" {
+		return func() {}, nil
+	}
+
+	var undone atomic.Bool
+	undo := func() {
+		if !undone.CompareAndSwap(false, true) {
+			return
+		}
+		delReq := larkim.NewDeleteMessageReactionReqBuilder().
+			MessageId(messageID).
+			ReactionId(reactionID).
+			Build()
+		_, _ = c.client.Im.V1.MessageReaction.Delete(context.Background(), delReq)
+	}
+	return undo, nil
+}
+
+// SendMedia implements channels.MediaSender.
+// Uploads images/files via Feishu API then sends as messages.
+func (c *FeishuChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessage) error {
+	if !c.IsRunning() {
+		return channels.ErrNotRunning
+	}
+
+	if msg.ChatID == "" {
+		return fmt.Errorf("chat ID is empty: %w", channels.ErrSendFailed)
+	}
+
+	store := c.GetMediaStore()
+	if store == nil {
+		return fmt.Errorf("no media store available: %w", channels.ErrSendFailed)
+	}
+
+	for _, part := range msg.Parts {
+		if err := c.sendMediaPart(ctx, msg.ChatID, part, store); err != nil {
+			return err
+		}
+	}
 
 	return nil
 }
 
+// sendMediaPart resolves and sends a single media part.
+func (c *FeishuChannel) sendMediaPart(
+	ctx context.Context,
+	chatID string,
+	part bus.MediaPart,
+	store media.MediaStore,
+) error {
+	localPath, err := store.Resolve(part.Ref)
+	if err != nil {
+		logger.ErrorCF("feishu", "Failed to resolve media ref", map[string]any{
+			"ref":   part.Ref,
+			"error": err.Error(),
+		})
+		return nil // skip this part
+	}
+
+	file, err := os.Open(localPath)
+	if err != nil {
+		logger.ErrorCF("feishu", "Failed to open media file", map[string]any{
+			"path":  localPath,
+			"error": err.Error(),
+		})
+		return nil // skip this part
+	}
+	defer file.Close()
+
+	switch part.Type {
+	case "image":
+		err = c.sendImage(ctx, chatID, file)
+	default:
+		filename := part.Filename
+		if filename == "" {
+			filename = "file"
+		}
+		err = c.sendFile(ctx, chatID, file, filename, part.Type)
+	}
+
+	if err != nil {
+		logger.ErrorCF("feishu", "Failed to send media", map[string]any{
+			"type":  part.Type,
+			"error": err.Error(),
+		})
+		return fmt.Errorf("feishu send media: %w", channels.ErrTemporary)
+	}
+	return nil
+}
+
+// --- Inbound message handling ---
+
 func (c *FeishuChannel) handleMessageReceive(ctx context.Context, event *larkim.P2MessageReceiveV1) error {
 	if event == nil || event.Event == nil || event.Event.Message == nil {
 		return nil
@@ -151,34 +335,68 @@ func (c *FeishuChannel) handleMessageReceive(ctx context.Context, event *larkim.
 		senderID = "unknown"
 	}
 
-	content := extractFeishuMessageContent(message)
+	messageType := stringValue(message.MessageType)
+	messageID := stringValue(message.MessageId)
+	rawContent := stringValue(message.Content)
+
+	// Check allowlist early to avoid downloading media for rejected senders.
+	// BaseChannel.HandleMessage will check again, but this avoids wasted network I/O.
+	senderInfo := bus.SenderInfo{
+		Platform:    "feishu",
+		PlatformID:  senderID,
+		CanonicalID: identity.BuildCanonicalID("feishu", senderID),
+	}
+	if !c.IsAllowedSender(senderInfo) {
+		return nil
+	}
+
+	// Extract content based on message type
+	content := extractContent(messageType, rawContent)
+
+	// Handle media messages (download and store)
+	var mediaRefs []string
+	if store := c.GetMediaStore(); store != nil && messageID != "" {
+		mediaRefs = c.downloadInboundMedia(ctx, chatID, messageID, messageType, rawContent, store)
+	}
+
+	// Append media tags to content (like Telegram does)
+	content = appendMediaTags(content, messageType, mediaRefs)
+
 	if content == "" {
 		content = "[empty message]"
 	}
 
 	metadata := map[string]string{}
-	messageID := ""
+	if messageID != "" {
-	if mid := stringValue(message.MessageId); mid != "" {
+		metadata["message_id"] = messageID
-		messageID = mid
 	}
-	if messageType := stringValue(message.MessageType); messageType != "" {
+	if messageType != "" {
 		metadata["message_type"] = messageType
 	}
-	if chatType := stringValue(message.ChatType); chatType != "" {
+	chatType := stringValue(message.ChatType)
+	if chatType != "" {
 		metadata["chat_type"] = chatType
 	}
 	if sender != nil && sender.TenantKey != nil {
 		metadata["tenant_key"] = *sender.TenantKey
 	}
 
-	chatType := stringValue(message.ChatType)
 	var peer bus.Peer
 	if chatType == "p2p" {
 		peer = bus.Peer{Kind: "direct", ID: senderID}
 	} else {
 		peer = bus.Peer{Kind: "group", ID: chatID}
+
+		// Check if bot was mentioned
+		isMentioned := c.isBotMentioned(message)
+
+		// Strip mention placeholders from content before group trigger check
+		if len(message.Mentions) > 0 {
+			content = stripMentionPlaceholders(content, message.Mentions)
+		}
+
 		// In group chats, apply unified group trigger filtering
-		respond, cleaned := c.ShouldRespondInGroup(false, content)
+		respond, cleaned := c.ShouldRespondInGroup(isMentioned, content)
 		if !respond {
 			return nil
 		}
@@ -188,20 +406,396 @@ func (c *FeishuChannel) handleMessageReceive(ctx context.Context, event *larkim.
 	logger.InfoCF("feishu", "Feishu message received", map[string]any{
 		"sender_id":  senderID,
 		"chat_id":    chatID,
+		"message_id": messageID,
 		"preview":    utils.Truncate(content, 80),
 	})
 
-	senderInfo := bus.SenderInfo{
+	c.HandleMessage(ctx, peer, messageID, senderID, chatID, content, mediaRefs, metadata, senderInfo)
-		Platform:    "feishu",
+	return nil
-		PlatformID:  senderID,
+}
-		CanonicalID: identity.BuildCanonicalID("feishu", senderID),
+
+// --- Internal helpers ---
+
+// fetchBotOpenID calls the Feishu bot info API to retrieve and store the bot's open_id.
+func (c *FeishuChannel) fetchBotOpenID(ctx context.Context) error {
+	resp, err := c.client.Do(ctx, &larkcore.ApiReq{
+		HttpMethod:                http.MethodGet,
+		ApiPath:                   "/open-apis/bot/v3/info",
+		SupportedAccessTokenTypes: []larkcore.AccessTokenType{larkcore.AccessTokenTypeTenant},
+	})
+	if err != nil {
+		return fmt.Errorf("bot info request: %w", err)
 	}
 
-	if !c.IsAllowedSender(senderInfo) {
+	var result struct {
+		Code int `json:"code"`
+		Bot  struct {
+			OpenID string `json:"open_id"`
+		} `json:"bot"`
+	}
+	if err := json.Unmarshal(resp.RawBody, &result); err != nil {
+		return fmt.Errorf("bot info parse: %w", err)
+	}
+	if result.Code != 0 {
+		return fmt.Errorf("bot info api error (code=%d)", result.Code)
+	}
+	if result.Bot.OpenID == "" {
+		return fmt.Errorf("bot info: empty open_id")
+	}
+
+	c.botOpenID.Store(result.Bot.OpenID)
+	logger.InfoCF("feishu", "Fetched bot open_id from API", map[string]any{
+		"open_id": result.Bot.OpenID,
+	})
+	return nil
+}
+
+// isBotMentioned checks if the bot was @mentioned in the message.
+func (c *FeishuChannel) isBotMentioned(message *larkim.EventMessage) bool {
+	if message.Mentions == nil {
+		return false
+	}
+
+	knownID, _ := c.botOpenID.Load().(string)
+	if knownID == "" {
+		logger.DebugCF("feishu", "Bot open_id unknown, cannot detect @mention", nil)
+		return false
+	}
+
+	for _, m := range message.Mentions {
+		if m.Id == nil {
+			continue
+		}
+		if m.Id.OpenId != nil && *m.Id.OpenId == knownID {
+			return true
+		}
+	}
+	return false
+}
+
+// extractContent extracts text content from different message types.
+func extractContent(messageType, rawContent string) string {
+	if rawContent == "" {
+		return ""
+	}
+
+	switch messageType {
+	case larkim.MsgTypeText:
+		var textPayload struct {
+			Text string `json:"text"`
+		}
+		if err := json.Unmarshal([]byte(rawContent), &textPayload); err == nil {
+			return textPayload.Text
+		}
+		return rawContent
+
+	case larkim.MsgTypePost:
+		// Pass raw JSON to LLM — structured rich text is more informative than flattened plain text
+		return rawContent
+
+	case larkim.MsgTypeImage:
+		// Image messages don't have text content
+		return ""
+
+	case larkim.MsgTypeFile, larkim.MsgTypeAudio, larkim.MsgTypeMedia:
+		// File/audio/video messages may have a filename
+		name := extractFileName(rawContent)
+		if name != "" {
+			return name
+		}
+		return ""
+
+	default:
+		return rawContent
+	}
+}
+
+// downloadInboundMedia downloads media from inbound messages and stores in MediaStore.
+func (c *FeishuChannel) downloadInboundMedia(
+	ctx context.Context,
+	chatID, messageID, messageType, rawContent string,
+	store media.MediaStore,
+) []string {
+	var refs []string
+	scope := channels.BuildMediaScope("feishu", chatID, messageID)
+
+	switch messageType {
+	case larkim.MsgTypeImage:
+		imageKey := extractImageKey(rawContent)
+		if imageKey == "" {
 			return nil
 		}
+		ref := c.downloadResource(ctx, messageID, imageKey, "image", ".jpg", store, scope)
+		if ref != "" {
+			refs = append(refs, ref)
+		}
 
-	c.HandleMessage(ctx, peer, messageID, senderID, chatID, content, nil, metadata, senderInfo)
+	case larkim.MsgTypeFile, larkim.MsgTypeAudio, larkim.MsgTypeMedia:
+		fileKey := extractFileKey(rawContent)
+		if fileKey == "" {
+			return nil
+		}
+		// Derive a fallback extension from the message type.
+		var ext string
+		switch messageType {
+		case larkim.MsgTypeAudio:
+			ext = ".ogg"
+		case larkim.MsgTypeMedia:
+			ext = ".mp4"
+		default:
+			ext = "" // generic file — rely on resp.FileName
+		}
+		ref := c.downloadResource(ctx, messageID, fileKey, "file", ext, store, scope)
+		if ref != "" {
+			refs = append(refs, ref)
+		}
+	}
+
+	return refs
+}
+
+// downloadResource downloads a message resource (image/file) from Feishu,
+// writes it to the project media directory, and stores the reference in MediaStore.
+// fallbackExt (e.g. ".jpg") is appended when the resolved filename has no extension.
+func (c *FeishuChannel) downloadResource(
+	ctx context.Context,
+	messageID, fileKey, resourceType, fallbackExt string,
+	store media.MediaStore,
+	scope string,
+) string {
+	req := larkim.NewGetMessageResourceReqBuilder().
+		MessageId(messageID).
+		FileKey(fileKey).
+		Type(resourceType).
+		Build()
+
+	resp, err := c.client.Im.V1.MessageResource.Get(ctx, req)
+	if err != nil {
+		logger.ErrorCF("feishu", "Failed to download resource", map[string]any{
+			"message_id": messageID,
+			"file_key":   fileKey,
+			"error":      err.Error(),
+		})
+		return ""
+	}
+	if !resp.Success() {
+		logger.ErrorCF("feishu", "Resource download api error", map[string]any{
+			"code": resp.Code,
+			"msg":  resp.Msg,
+		})
+		return ""
+	}
+
+	if resp.File == nil {
+		return ""
+	}
+	// Safely close the underlying reader if it implements io.Closer (e.g. HTTP response body).
+	if closer, ok := resp.File.(io.Closer); ok {
+		defer closer.Close()
+	}
+
+	filename := resp.FileName
+	if filename == "" {
+		filename = fileKey
+	}
+	// If filename still has no extension, append the fallback (like Telegram's ext parameter).
+	if filepath.Ext(filename) == "" && fallbackExt != "" {
+		filename += fallbackExt
+	}
+
+	// Write to the shared picoclaw_media directory using a unique name to avoid collisions.
+	mediaDir := filepath.Join(os.TempDir(), "picoclaw_media")
+	if mkdirErr := os.MkdirAll(mediaDir, 0o700); mkdirErr != nil {
+		logger.ErrorCF("feishu", "Failed to create media directory", map[string]any{
+			"error": mkdirErr.Error(),
+		})
+		return ""
+	}
+	ext := filepath.Ext(filename)
+	localPath := filepath.Join(mediaDir, utils.SanitizeFilename(messageID+"-"+fileKey+ext))
+
+	out, err := os.Create(localPath)
+	if err != nil {
+		logger.ErrorCF("feishu", "Failed to create local file for resource", map[string]any{
+			"error": err.Error(),
+		})
+		return ""
+	}
+
+	if _, copyErr := io.Copy(out, resp.File); copyErr != nil {
+		out.Close()
+		os.Remove(localPath)
+		logger.ErrorCF("feishu", "Failed to write resource to file", map[string]any{
+			"error": copyErr.Error(),
+		})
+		return ""
+	}
+	out.Close()
+
+	ref, err := store.Store(localPath, media.MediaMeta{
+		Filename: filename,
+		Source:   "feishu",
+	}, scope)
+	if err != nil {
+		logger.ErrorCF("feishu", "Failed to store downloaded resource", map[string]any{
+			"file_key": fileKey,
+			"error":    err.Error(),
+		})
+		os.Remove(localPath)
+		return ""
+	}
+
+	return ref
+}
+
+// appendMediaTags appends media type tags to content (like Telegram's "[image: photo]").
+func appendMediaTags(content, messageType string, mediaRefs []string) string {
+	if len(mediaRefs) == 0 {
+		return content
+	}
+
+	var tag string
+	switch messageType {
+	case larkim.MsgTypeImage:
+		tag = "[image: photo]"
+	case larkim.MsgTypeAudio:
+		tag = "[audio]"
+	case larkim.MsgTypeMedia:
+		tag = "[video]"
+	case larkim.MsgTypeFile:
+		tag = "[file]"
+	default:
+		tag = "[attachment]"
+	}
+
+	if content == "" {
+		return tag
+	}
+	return content + " " + tag
+}
+
+// sendCard sends an interactive card message to a chat.
+func (c *FeishuChannel) sendCard(ctx context.Context, chatID, cardContent string) error {
+	req := larkim.NewCreateMessageReqBuilder().
+		ReceiveIdType(larkim.ReceiveIdTypeChatId).
+		Body(larkim.NewCreateMessageReqBodyBuilder().
+			ReceiveId(chatID).
+			MsgType(larkim.MsgTypeInteractive).
+			Content(cardContent).
+			Build()).
+		Build()
+
+	resp, err := c.client.Im.V1.Message.Create(ctx, req)
+	if err != nil {
+		return fmt.Errorf("feishu send card: %w", channels.ErrTemporary)
+	}
+
+	if !resp.Success() {
+		return fmt.Errorf("feishu api error (code=%d msg=%s): %w", resp.Code, resp.Msg, channels.ErrTemporary)
+	}
+
+	logger.DebugCF("feishu", "Feishu card message sent", map[string]any{
+		"chat_id": chatID,
+	})
+
+	return nil
+}
+
+// sendImage uploads an image and sends it as a message.
+func (c *FeishuChannel) sendImage(ctx context.Context, chatID string, file *os.File) error {
+	// Upload image to get image_key
+	uploadReq := larkim.NewCreateImageReqBuilder().
+		Body(larkim.NewCreateImageReqBodyBuilder().
+			ImageType("message").
+			Image(file).
+			Build()).
+		Build()
+
+	uploadResp, err := c.client.Im.V1.Image.Create(ctx, uploadReq)
+	if err != nil {
+		return fmt.Errorf("feishu image upload: %w", err)
+	}
+	if !uploadResp.Success() {
+		return fmt.Errorf("feishu image upload api error (code=%d msg=%s)", uploadResp.Code, uploadResp.Msg)
+	}
+	if uploadResp.Data == nil || uploadResp.Data.ImageKey == nil {
+		return fmt.Errorf("feishu image upload: no image_key returned")
+	}
+
+	imageKey := *uploadResp.Data.ImageKey
+
+	// Send image message
+	content, _ := json.Marshal(map[string]string{"image_key": imageKey})
+	req := larkim.NewCreateMessageReqBuilder().
+		ReceiveIdType(larkim.ReceiveIdTypeChatId).
+		Body(larkim.NewCreateMessageReqBodyBuilder().
+			ReceiveId(chatID).
+			MsgType(larkim.MsgTypeImage).
+			Content(string(content)).
+			Build()).
+		Build()
+
+	resp, err := c.client.Im.V1.Message.Create(ctx, req)
+	if err != nil {
+		return fmt.Errorf("feishu image send: %w", err)
+	}
+	if !resp.Success() {
+		return fmt.Errorf("feishu image send api error (code=%d msg=%s)", resp.Code, resp.Msg)
+	}
+	return nil
+}
+
+// sendFile uploads a file and sends it as a message.
+func (c *FeishuChannel) sendFile(ctx context.Context, chatID string, file *os.File, filename, fileType string) error {
+	// Map part type to Feishu file type
+	feishuFileType := "stream"
+	switch fileType {
+	case "audio":
+		feishuFileType = "opus"
+	case "video":
+		feishuFileType = "mp4"
+	}
+
+	// Upload file to get file_key
+	uploadReq := larkim.NewCreateFileReqBuilder().
+		Body(larkim.NewCreateFileReqBodyBuilder().
+			FileType(feishuFileType).
+			FileName(filename).
+			File(file).
+			Build()).
+		Build()
+
+	uploadResp, err := c.client.Im.V1.File.Create(ctx, uploadReq)
+	if err != nil {
+		return fmt.Errorf("feishu file upload: %w", err)
+	}
+	if !uploadResp.Success() {
+		return fmt.Errorf("feishu file upload api error (code=%d msg=%s)", uploadResp.Code, uploadResp.Msg)
+	}
+	if uploadResp.Data == nil || uploadResp.Data.FileKey == nil {
+		return fmt.Errorf("feishu file upload: no file_key returned")
+	}
+
+	fileKey := *uploadResp.Data.FileKey
+
+	// Send file message
+	content, _ := json.Marshal(map[string]string{"file_key": fileKey})
+	req := larkim.NewCreateMessageReqBuilder().
+		ReceiveIdType(larkim.ReceiveIdTypeChatId).
+		Body(larkim.NewCreateMessageReqBodyBuilder().
+			ReceiveId(chatID).
+			MsgType(larkim.MsgTypeFile).
+			Content(string(content)).
+			Build()).
+		Build()
+
+	resp, err := c.client.Im.V1.Message.Create(ctx, req)
+	if err != nil {
+		return fmt.Errorf("feishu file send: %w", err)
+	}
+	if !resp.Success() {
+		return fmt.Errorf("feishu file send api error (code=%d msg=%s)", resp.Code, resp.Msg)
+	}
 	return nil
 }
 
@@ -222,20 +816,3 @@ func extractFeishuSenderID(sender *larkim.EventSender) string {
 
 	return ""
 }
-
-func extractFeishuMessageContent(message *larkim.EventMessage) string {
-	if message == nil || message.Content == nil || *message.Content == "" {
-		return ""
-	}
-
-	if message.MessageType != nil && *message.MessageType == larkim.MsgTypeText {
-		var textPayload struct {
-			Text string `json:"text"`
-		}
-		if err := json.Unmarshal([]byte(*message.Content), &textPayload); err == nil {
-			return textPayload.Text
-		}
-	}
-
-	return *message.Content
-}

pkg/channels/feishu/feishu_64_test.go

@@ -0,0 +1,256 @@
+//go:build amd64 || arm64 || riscv64 || mips64 || ppc64
+
+package feishu
+
+import (
+	"testing"
+
+	larkim "github.com/larksuite/oapi-sdk-go/v3/service/im/v1"
+)
+
+func TestExtractContent(t *testing.T) {
+	tests := []struct {
+		name        string
+		messageType string
+		rawContent  string
+		want        string
+	}{
+		{
+			name:        "text message",
+			messageType: "text",
+			rawContent:  `{"text": "hello world"}`,
+			want:        "hello world",
+		},
+		{
+			name:        "text message invalid JSON",
+			messageType: "text",
+			rawContent:  `not json`,
+			want:        "not json",
+		},
+		{
+			name:        "post message returns raw JSON",
+			messageType: "post",
+			rawContent:  `{"title": "test post"}`,
+			want:        `{"title": "test post"}`,
+		},
+		{
+			name:        "image message returns empty",
+			messageType: "image",
+			rawContent:  `{"image_key": "img_xxx"}`,
+			want:        "",
+		},
+		{
+			name:        "file message with filename",
+			messageType: "file",
+			rawContent:  `{"file_key": "file_xxx", "file_name": "report.pdf"}`,
+			want:        "report.pdf",
+		},
+		{
+			name:        "file message without filename",
+			messageType: "file",
+			rawContent:  `{"file_key": "file_xxx"}`,
+			want:        "",
+		},
+		{
+			name:        "audio message with filename",
+			messageType: "audio",
+			rawContent:  `{"file_key": "file_xxx", "file_name": "recording.ogg"}`,
+			want:        "recording.ogg",
+		},
+		{
+			name:        "media message with filename",
+			messageType: "media",
+			rawContent:  `{"file_key": "file_xxx", "file_name": "video.mp4"}`,
+			want:        "video.mp4",
+		},
+		{
+			name:        "unknown message type returns raw",
+			messageType: "sticker",
+			rawContent:  `{"sticker_id": "sticker_xxx"}`,
+			want:        `{"sticker_id": "sticker_xxx"}`,
+		},
+		{
+			name:        "empty raw content",
+			messageType: "text",
+			rawContent:  "",
+			want:        "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractContent(tt.messageType, tt.rawContent)
+			if got != tt.want {
+				t.Errorf("extractContent(%q, %q) = %q, want %q", tt.messageType, tt.rawContent, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestAppendMediaTags(t *testing.T) {
+	tests := []struct {
+		name        string
+		content     string
+		messageType string
+		mediaRefs   []string
+		want        string
+	}{
+		{
+			name:        "no refs returns content unchanged",
+			content:     "hello",
+			messageType: "image",
+			mediaRefs:   nil,
+			want:        "hello",
+		},
+		{
+			name:        "empty refs returns content unchanged",
+			content:     "hello",
+			messageType: "image",
+			mediaRefs:   []string{},
+			want:        "hello",
+		},
+		{
+			name:        "image with content",
+			content:     "check this",
+			messageType: "image",
+			mediaRefs:   []string{"ref1"},
+			want:        "check this [image: photo]",
+		},
+		{
+			name:        "image empty content",
+			content:     "",
+			messageType: "image",
+			mediaRefs:   []string{"ref1"},
+			want:        "[image: photo]",
+		},
+		{
+			name:        "audio",
+			content:     "listen",
+			messageType: "audio",
+			mediaRefs:   []string{"ref1"},
+			want:        "listen [audio]",
+		},
+		{
+			name:        "media/video",
+			content:     "watch",
+			messageType: "media",
+			mediaRefs:   []string{"ref1"},
+			want:        "watch [video]",
+		},
+		{
+			name:        "file",
+			content:     "report.pdf",
+			messageType: "file",
+			mediaRefs:   []string{"ref1"},
+			want:        "report.pdf [file]",
+		},
+		{
+			name:        "unknown type",
+			content:     "something",
+			messageType: "sticker",
+			mediaRefs:   []string{"ref1"},
+			want:        "something [attachment]",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := appendMediaTags(tt.content, tt.messageType, tt.mediaRefs)
+			if got != tt.want {
+				t.Errorf(
+					"appendMediaTags(%q, %q, %v) = %q, want %q",
+					tt.content,
+					tt.messageType,
+					tt.mediaRefs,
+					got,
+					tt.want,
+				)
+			}
+		})
+	}
+}
+
+func TestExtractFeishuSenderID(t *testing.T) {
+	strPtr := func(s string) *string { return &s }
+
+	tests := []struct {
+		name   string
+		sender *larkim.EventSender
+		want   string
+	}{
+		{
+			name:   "nil sender",
+			sender: nil,
+			want:   "",
+		},
+		{
+			name:   "nil sender ID",
+			sender: &larkim.EventSender{SenderId: nil},
+			want:   "",
+		},
+		{
+			name: "userId preferred",
+			sender: &larkim.EventSender{
+				SenderId: &larkim.UserId{
+					UserId:  strPtr("u_abc123"),
+					OpenId:  strPtr("ou_def456"),
+					UnionId: strPtr("on_ghi789"),
+				},
+			},
+			want: "u_abc123",
+		},
+		{
+			name: "openId fallback",
+			sender: &larkim.EventSender{
+				SenderId: &larkim.UserId{
+					UserId:  strPtr(""),
+					OpenId:  strPtr("ou_def456"),
+					UnionId: strPtr("on_ghi789"),
+				},
+			},
+			want: "ou_def456",
+		},
+		{
+			name: "unionId fallback",
+			sender: &larkim.EventSender{
+				SenderId: &larkim.UserId{
+					UserId:  strPtr(""),
+					OpenId:  strPtr(""),
+					UnionId: strPtr("on_ghi789"),
+				},
+			},
+			want: "on_ghi789",
+		},
+		{
+			name: "all empty strings",
+			sender: &larkim.EventSender{
+				SenderId: &larkim.UserId{
+					UserId:  strPtr(""),
+					OpenId:  strPtr(""),
+					UnionId: strPtr(""),
+				},
+			},
+			want: "",
+		},
+		{
+			name: "nil userId pointer falls through",
+			sender: &larkim.EventSender{
+				SenderId: &larkim.UserId{
+					UserId:  nil,
+					OpenId:  strPtr("ou_def456"),
+					UnionId: nil,
+				},
+			},
+			want: "ou_def456",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractFeishuSenderID(tt.sender)
+			if got != tt.want {
+				t.Errorf("extractFeishuSenderID() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}

pkg/channels/telegram/telegram.go

@@ -72,6 +72,10 @@ func NewTelegramChannel(cfg *config.Config, bus *bus.MessageBus) (*TelegramChann
 		}))
 	}
 
+	if baseURL := strings.TrimRight(strings.TrimSpace(telegramCfg.BaseURL), "/"); baseURL != "" {
+		opts = append(opts, telego.WithAPIServer(baseURL))
+	}
+
 	bot, err := telego.NewBot(telegramCfg.Token, opts...)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create telegram bot: %w", err)

pkg/config/config.go

@@ -181,6 +181,16 @@ type AgentDefaults struct {
 	Temperature               *float64 `json:"temperature,omitempty"           env:"PICOCLAW_AGENTS_DEFAULTS_TEMPERATURE"`
 	MaxToolIterations         int      `json:"max_tool_iterations"             env:"PICOCLAW_AGENTS_DEFAULTS_MAX_TOOL_ITERATIONS"`
 	TLDRIncludeMessage        bool     `json:"tldr_include_message"            env:"PICOCLAW_AGENTS_DEFAULTS_TLDR_INCLUDE_MESSAGE"`
+	MaxMediaSize              int      `json:"max_media_size,omitempty"        env:"PICOCLAW_AGENTS_DEFAULTS_MAX_MEDIA_SIZE"`
+}
+
+const DefaultMaxMediaSize = 20 * 1024 * 1024 // 20 MB
+
+func (d *AgentDefaults) GetMaxMediaSize() int {
+	if d.MaxMediaSize > 0 {
+		return d.MaxMediaSize
+	}
+	return DefaultMaxMediaSize
 }
 
 // GetModelName returns the effective model name for the agent defaults.
@@ -238,6 +248,7 @@ type WhatsAppConfig struct {
 type TelegramConfig struct {
 	Enabled            bool                `json:"enabled"                 env:"PICOCLAW_CHANNELS_TELEGRAM_ENABLED"`
 	Token              string              `json:"token"                   env:"PICOCLAW_CHANNELS_TELEGRAM_TOKEN"`
+	BaseURL            string              `json:"base_url"                env:"PICOCLAW_CHANNELS_TELEGRAM_BASE_URL"`
 	Proxy              string              `json:"proxy"                   env:"PICOCLAW_CHANNELS_TELEGRAM_PROXY"`
 	AllowFrom          FlexibleStringSlice `json:"allow_from"              env:"PICOCLAW_CHANNELS_TELEGRAM_ALLOW_FROM"`
 	GroupTrigger       GroupTriggerConfig  `json:"group_trigger,omitempty"`
@@ -254,6 +265,7 @@ type FeishuConfig struct {
 	VerificationToken  string              `json:"verification_token"      env:"PICOCLAW_CHANNELS_FEISHU_VERIFICATION_TOKEN"`
 	AllowFrom          FlexibleStringSlice `json:"allow_from"              env:"PICOCLAW_CHANNELS_FEISHU_ALLOW_FROM"`
 	GroupTrigger       GroupTriggerConfig  `json:"group_trigger,omitempty"`
+	Placeholder        PlaceholderConfig   `json:"placeholder,omitempty"`
 	ReasoningChannelID string              `json:"reasoning_channel_id"    env:"PICOCLAW_CHANNELS_FEISHU_REASONING_CHANNEL_ID"`
 }
 
@@ -400,6 +412,7 @@ type DevicesConfig struct {
 type ProvidersConfig struct {
 	Anthropic     ProviderConfig       `json:"anthropic"`
 	OpenAI        OpenAIProviderConfig `json:"openai"`
+	LiteLLM       ProviderConfig       `json:"litellm"`
 	OpenRouter    ProviderConfig       `json:"openrouter"`
 	Groq          ProviderConfig       `json:"groq"`
 	Zhipu         ProviderConfig       `json:"zhipu"`
@@ -423,6 +436,7 @@ type ProvidersConfig struct {
 func (p ProvidersConfig) IsEmpty() bool {
 	return p.Anthropic.APIKey == "" && p.Anthropic.APIBase == "" &&
 		p.OpenAI.APIKey == "" && p.OpenAI.APIBase == "" &&
+		p.LiteLLM.APIKey == "" && p.LiteLLM.APIBase == "" &&
 		p.OpenRouter.APIKey == "" && p.OpenRouter.APIBase == "" &&
 		p.Groq.APIKey == "" && p.Groq.APIBase == "" &&
 		p.Zhipu.APIKey == "" && p.Zhipu.APIBase == "" &&
@@ -566,6 +580,7 @@ type ToolsConfig struct {
 	Exec            ExecConfig         `json:"exec"`
 	Skills          SkillsToolsConfig  `json:"skills"`
 	MediaCleanup    MediaCleanupConfig `json:"media_cleanup"`
+	MCP             MCPConfig          `json:"mcp"`
 }
 
 type SkillsToolsConfig struct {
@@ -595,6 +610,34 @@ type ClawHubRegistryConfig struct {
 	MaxResponseSize int    `json:"max_response_size" env:"PICOCLAW_SKILLS_REGISTRIES_CLAWHUB_MAX_RESPONSE_SIZE"`
 }
 
+// MCPServerConfig defines configuration for a single MCP server
+type MCPServerConfig struct {
+	// Enabled indicates whether this MCP server is active
+	Enabled bool `json:"enabled"`
+	// Command is the executable to run (e.g., "npx", "python", "/path/to/server")
+	Command string `json:"command"`
+	// Args are the arguments to pass to the command
+	Args []string `json:"args,omitempty"`
+	// Env are environment variables to set for the server process (stdio only)
+	Env map[string]string `json:"env,omitempty"`
+	// EnvFile is the path to a file containing environment variables (stdio only)
+	EnvFile string `json:"env_file,omitempty"`
+	// Type is "stdio", "sse", or "http" (default: stdio if command is set, sse if url is set)
+	Type string `json:"type,omitempty"`
+	// URL is used for SSE/HTTP transport
+	URL string `json:"url,omitempty"`
+	// Headers are HTTP headers to send with requests (sse/http only)
+	Headers map[string]string `json:"headers,omitempty"`
+}
+
+// MCPConfig defines configuration for all MCP servers
+type MCPConfig struct {
+	// Enabled globally enables/disables MCP integration
+	Enabled bool `json:"enabled" env:"PICOCLAW_TOOLS_MCP_ENABLED"`
+	// Servers is a map of server name to server configuration
+	Servers map[string]MCPServerConfig `json:"servers,omitempty"`
+}
+
 func LoadConfig(path string) (*Config, error) {
 	cfg := DefaultConfig()
 

pkg/config/defaults.go

@@ -361,6 +361,10 @@ func DefaultConfig() *Config {
 					TTLSeconds: 300,
 				},
 			},
+			MCP: MCPConfig{
+				Enabled: false,
+				Servers: map[string]MCPServerConfig{},
+			},
 		},
 		Heartbeat: HeartbeatConfig{
 			Enabled:  true,

pkg/config/migration.go

@@ -88,6 +88,23 @@ func ConvertProvidersToModelList(cfg *Config) []ModelConfig {
 				}, true
 			},
 		},
+		{
+			providerNames: []string{"litellm"},
+			protocol:      "litellm",
+			buildConfig: func(p ProvidersConfig) (ModelConfig, bool) {
+				if p.LiteLLM.APIKey == "" && p.LiteLLM.APIBase == "" {
+					return ModelConfig{}, false
+				}
+				return ModelConfig{
+					ModelName:      "litellm",
+					Model:          "litellm/auto",
+					APIKey:         p.LiteLLM.APIKey,
+					APIBase:        p.LiteLLM.APIBase,
+					Proxy:          p.LiteLLM.Proxy,
+					RequestTimeout: p.LiteLLM.RequestTimeout,
+				}, true
+			},
+		},
 		{
 			providerNames: []string{"openrouter"},
 			protocol:      "openrouter",

pkg/config/migration_test.go

@@ -63,6 +63,33 @@ func TestConvertProvidersToModelList_Anthropic(t *testing.T) {
 	}
 }
 
+func TestConvertProvidersToModelList_LiteLLM(t *testing.T) {
+	cfg := &Config{
+		Providers: ProvidersConfig{
+			LiteLLM: ProviderConfig{
+				APIKey:  "litellm-key",
+				APIBase: "http://localhost:4000/v1",
+			},
+		},
+	}
+
+	result := ConvertProvidersToModelList(cfg)
+
+	if len(result) != 1 {
+		t.Fatalf("len(result) = %d, want 1", len(result))
+	}
+
+	if result[0].ModelName != "litellm" {
+		t.Errorf("ModelName = %q, want %q", result[0].ModelName, "litellm")
+	}
+	if result[0].Model != "litellm/auto" {
+		t.Errorf("Model = %q, want %q", result[0].Model, "litellm/auto")
+	}
+	if result[0].APIBase != "http://localhost:4000/v1" {
+		t.Errorf("APIBase = %q, want %q", result[0].APIBase, "http://localhost:4000/v1")
+	}
+}
+
 func TestConvertProvidersToModelList_Multiple(t *testing.T) {
 	cfg := &Config{
 		Providers: ProvidersConfig{
@@ -115,6 +142,7 @@ func TestConvertProvidersToModelList_AllProviders(t *testing.T) {
 	cfg := &Config{
 		Providers: ProvidersConfig{
 			OpenAI:        OpenAIProviderConfig{ProviderConfig: ProviderConfig{APIKey: "key1"}},
+			LiteLLM:       ProviderConfig{APIKey: "key-litellm", APIBase: "http://localhost:4000/v1"},
 			Anthropic:     ProviderConfig{APIKey: "key2"},
 			OpenRouter:    ProviderConfig{APIKey: "key3"},
 			Groq:          ProviderConfig{APIKey: "key4"},
@@ -137,9 +165,9 @@ func TestConvertProvidersToModelList_AllProviders(t *testing.T) {
 
 	result := ConvertProvidersToModelList(cfg)
 
-	// All 18 providers should be converted
+	// All 19 providers should be converted
-	if len(result) != 18 {
+	if len(result) != 19 {
-		t.Errorf("len(result) = %d, want 18", len(result))
+		t.Errorf("len(result) = %d, want 19", len(result))
 	}
 }
 

pkg/mcp/manager.go

@@ -0,0 +1,532 @@
+package mcp
+
+import (
+	"bufio"
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"sync"
+	"sync/atomic"
+
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+
+	"github.com/sipeed/picoclaw/pkg/config"
+	"github.com/sipeed/picoclaw/pkg/logger"
+)
+
+// headerTransport is an http.RoundTripper that adds custom headers to requests
+type headerTransport struct {
+	base    http.RoundTripper
+	headers map[string]string
+}
+
+func (t *headerTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	// Clone the request to avoid modifying the original
+	req = req.Clone(req.Context())
+
+	// Add custom headers
+	for key, value := range t.headers {
+		req.Header.Set(key, value)
+	}
+
+	// Use the base transport
+	base := t.base
+	if base == nil {
+		base = http.DefaultTransport
+	}
+	return base.RoundTrip(req)
+}
+
+// loadEnvFile loads environment variables from a file in .env format
+// Each line should be in the format: KEY=value
+// Lines starting with # are comments
+// Empty lines are ignored
+func loadEnvFile(path string) (map[string]string, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open env file: %w", err)
+	}
+	defer file.Close()
+
+	envVars := make(map[string]string)
+	scanner := bufio.NewScanner(file)
+	lineNum := 0
+
+	for scanner.Scan() {
+		lineNum++
+		line := strings.TrimSpace(scanner.Text())
+
+		// Skip empty lines and comments
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+
+		// Parse KEY=value
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) != 2 {
+			return nil, fmt.Errorf("invalid format at line %d: %s", lineNum, line)
+		}
+
+		key := strings.TrimSpace(parts[0])
+		value := strings.TrimSpace(parts[1])
+
+		if key == "" {
+			return nil, fmt.Errorf("invalid format at line %d: empty key", lineNum)
+		}
+
+		// Remove surrounding quotes if present
+		if len(value) >= 2 {
+			if (value[0] == '"' && value[len(value)-1] == '"') ||
+				(value[0] == '\'' && value[len(value)-1] == '\'') {
+				value = value[1 : len(value)-1]
+			}
+		}
+
+		envVars[key] = value
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, fmt.Errorf("error reading env file: %w", err)
+	}
+
+	return envVars, nil
+}
+
+// ServerConnection represents a connection to an MCP server
+type ServerConnection struct {
+	Name    string
+	Client  *mcp.Client
+	Session *mcp.ClientSession
+	Tools   []*mcp.Tool
+}
+
+// Manager manages multiple MCP server connections
+type Manager struct {
+	servers map[string]*ServerConnection
+	mu      sync.RWMutex
+	closed  atomic.Bool    // changed from bool to atomic.Bool to avoid TOCTOU race
+	wg      sync.WaitGroup // tracks in-flight CallTool calls
+}
+
+// NewManager creates a new MCP manager
+func NewManager() *Manager {
+	return &Manager{
+		servers: make(map[string]*ServerConnection),
+	}
+}
+
+// LoadFromConfig loads MCP servers from configuration
+func (m *Manager) LoadFromConfig(ctx context.Context, cfg *config.Config) error {
+	return m.LoadFromMCPConfig(ctx, cfg.Tools.MCP, cfg.WorkspacePath())
+}
+
+// LoadFromMCPConfig loads MCP servers from MCP configuration and workspace path.
+// This is the minimal dependency version that doesn't require the full Config object.
+func (m *Manager) LoadFromMCPConfig(
+	ctx context.Context,
+	mcpCfg config.MCPConfig,
+	workspacePath string,
+) error {
+	if !mcpCfg.Enabled {
+		logger.InfoCF("mcp", "MCP integration is disabled", nil)
+		return nil
+	}
+
+	if len(mcpCfg.Servers) == 0 {
+		logger.InfoCF("mcp", "No MCP servers configured", nil)
+		return nil
+	}
+
+	logger.InfoCF("mcp", "Initializing MCP servers",
+		map[string]any{
+			"count": len(mcpCfg.Servers),
+		})
+
+	var wg sync.WaitGroup
+	errs := make(chan error, len(mcpCfg.Servers))
+	enabledCount := 0
+
+	for name, serverCfg := range mcpCfg.Servers {
+		if !serverCfg.Enabled {
+			logger.DebugCF("mcp", "Skipping disabled server",
+				map[string]any{
+					"server": name,
+				})
+			continue
+		}
+
+		enabledCount++
+		wg.Add(1)
+		go func(name string, serverCfg config.MCPServerConfig, workspace string) {
+			defer wg.Done()
+
+			// Resolve relative envFile paths relative to workspace
+			if serverCfg.EnvFile != "" && !filepath.IsAbs(serverCfg.EnvFile) {
+				if workspace == "" {
+					err := fmt.Errorf(
+						"workspace path is empty while resolving relative envFile %q for server %s",
+						serverCfg.EnvFile,
+						name,
+					)
+					logger.ErrorCF("mcp", "Invalid MCP server configuration",
+						map[string]any{
+							"server":   name,
+							"env_file": serverCfg.EnvFile,
+							"error":    err.Error(),
+						})
+					errs <- err
+					return
+				}
+				serverCfg.EnvFile = filepath.Join(workspace, serverCfg.EnvFile)
+			}
+
+			if err := m.ConnectServer(ctx, name, serverCfg); err != nil {
+				logger.ErrorCF("mcp", "Failed to connect to MCP server",
+					map[string]any{
+						"server": name,
+						"error":  err.Error(),
+					})
+				errs <- fmt.Errorf("failed to connect to server %s: %w", name, err)
+			}
+		}(name, serverCfg, workspacePath)
+	}
+
+	wg.Wait()
+	close(errs)
+
+	// Collect errors
+	var allErrors []error
+	for err := range errs {
+		allErrors = append(allErrors, err)
+	}
+
+	connectedCount := len(m.GetServers())
+
+	// If all enabled servers failed to connect, return aggregated error
+	if enabledCount > 0 && connectedCount == 0 {
+		logger.ErrorCF("mcp", "All MCP servers failed to connect",
+			map[string]any{
+				"failed": len(allErrors),
+				"total":  enabledCount,
+			})
+		return errors.Join(allErrors...)
+	}
+
+	if len(allErrors) > 0 {
+		logger.WarnCF("mcp", "Some MCP servers failed to connect",
+			map[string]any{
+				"failed":    len(allErrors),
+				"connected": connectedCount,
+				"total":     enabledCount,
+			})
+		// Don't fail completely if some servers successfully connected
+	}
+
+	logger.InfoCF("mcp", "MCP server initialization complete",
+		map[string]any{
+			"connected": connectedCount,
+			"total":     enabledCount,
+		})
+
+	return nil
+}
+
+// ConnectServer connects to a single MCP server
+func (m *Manager) ConnectServer(
+	ctx context.Context,
+	name string,
+	cfg config.MCPServerConfig,
+) error {
+	logger.InfoCF("mcp", "Connecting to MCP server",
+		map[string]any{
+			"server":     name,
+			"command":    cfg.Command,
+			"args_count": len(cfg.Args),
+		})
+
+	// Create client
+	client := mcp.NewClient(&mcp.Implementation{
+		Name:    "picoclaw",
+		Version: "1.0.0",
+	}, nil)
+
+	// Create transport based on configuration
+	// Auto-detect transport type if not explicitly specified
+	var transport mcp.Transport
+	transportType := cfg.Type
+
+	// Auto-detect: if URL is provided, use SSE; if command is provided, use stdio
+	if transportType == "" {
+		if cfg.URL != "" {
+			transportType = "sse"
+		} else if cfg.Command != "" {
+			transportType = "stdio"
+		} else {
+			return fmt.Errorf("either URL or command must be provided")
+		}
+	}
+
+	switch transportType {
+	case "sse", "http":
+		if cfg.URL == "" {
+			return fmt.Errorf("URL is required for SSE/HTTP transport")
+		}
+		logger.DebugCF("mcp", "Using SSE/HTTP transport",
+			map[string]any{
+				"server": name,
+				"url":    cfg.URL,
+			})
+
+		sseTransport := &mcp.StreamableClientTransport{
+			Endpoint: cfg.URL,
+		}
+
+		// Add custom headers if provided
+		if len(cfg.Headers) > 0 {
+			// Create a custom HTTP client with header-injecting transport
+			sseTransport.HTTPClient = &http.Client{
+				Transport: &headerTransport{
+					base:    http.DefaultTransport,
+					headers: cfg.Headers,
+				},
+			}
+			logger.DebugCF("mcp", "Added custom HTTP headers",
+				map[string]any{
+					"server":       name,
+					"header_count": len(cfg.Headers),
+				})
+		}
+
+		transport = sseTransport
+	case "stdio":
+		if cfg.Command == "" {
+			return fmt.Errorf("command is required for stdio transport")
+		}
+		logger.DebugCF("mcp", "Using stdio transport",
+			map[string]any{
+				"server":  name,
+				"command": cfg.Command,
+			})
+		// Create command with context
+		cmd := exec.CommandContext(ctx, cfg.Command, cfg.Args...)
+
+		// Build environment variables with proper override semantics
+		// Use a map to ensure config variables override file variables
+		envMap := make(map[string]string)
+
+		// Start with parent process environment
+		for _, e := range cmd.Environ() {
+			if idx := strings.Index(e, "="); idx > 0 {
+				envMap[e[:idx]] = e[idx+1:]
+			}
+		}
+
+		// Load environment variables from file if specified
+		if cfg.EnvFile != "" {
+			envVars, err := loadEnvFile(cfg.EnvFile)
+			if err != nil {
+				return fmt.Errorf("failed to load env file %s: %w", cfg.EnvFile, err)
+			}
+			for k, v := range envVars {
+				envMap[k] = v
+			}
+			logger.DebugCF("mcp", "Loaded environment variables from file",
+				map[string]any{
+					"server":    name,
+					"envFile":   cfg.EnvFile,
+					"var_count": len(envVars),
+				})
+		}
+
+		// Environment variables from config override those from file
+		for k, v := range cfg.Env {
+			envMap[k] = v
+		}
+
+		// Convert map to slice
+		env := make([]string, 0, len(envMap))
+		for k, v := range envMap {
+			env = append(env, fmt.Sprintf("%s=%s", k, v))
+		}
+		cmd.Env = env
+
+		transport = &mcp.CommandTransport{Command: cmd}
+	default:
+		return fmt.Errorf(
+			"unsupported transport type: %s (supported: stdio, sse, http)",
+			transportType,
+		)
+	}
+
+	// Connect to server
+	session, err := client.Connect(ctx, transport, nil)
+	if err != nil {
+		return fmt.Errorf("failed to connect: %w", err)
+	}
+
+	// Get server info
+	initResult := session.InitializeResult()
+	logger.InfoCF("mcp", "Connected to MCP server",
+		map[string]any{
+			"server":        name,
+			"serverName":    initResult.ServerInfo.Name,
+			"serverVersion": initResult.ServerInfo.Version,
+			"protocol":      initResult.ProtocolVersion,
+		})
+
+	// List available tools if supported
+	var tools []*mcp.Tool
+	if initResult.Capabilities.Tools != nil {
+		for tool, err := range session.Tools(ctx, nil) {
+			if err != nil {
+				logger.WarnCF("mcp", "Error listing tool",
+					map[string]any{
+						"server": name,
+						"error":  err.Error(),
+					})
+				continue
+			}
+			tools = append(tools, tool)
+		}
+
+		logger.InfoCF("mcp", "Listed tools from MCP server",
+			map[string]any{
+				"server":    name,
+				"toolCount": len(tools),
+			})
+	}
+
+	// Store connection
+	m.mu.Lock()
+	m.servers[name] = &ServerConnection{
+		Name:    name,
+		Client:  client,
+		Session: session,
+		Tools:   tools,
+	}
+	m.mu.Unlock()
+
+	return nil
+}
+
+// GetServers returns all connected servers
+func (m *Manager) GetServers() map[string]*ServerConnection {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	result := make(map[string]*ServerConnection, len(m.servers))
+	for k, v := range m.servers {
+		result[k] = v
+	}
+	return result
+}
+
+// GetServer returns a specific server connection
+func (m *Manager) GetServer(name string) (*ServerConnection, bool) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	conn, ok := m.servers[name]
+	return conn, ok
+}
+
+// CallTool calls a tool on a specific server
+func (m *Manager) CallTool(
+	ctx context.Context,
+	serverName, toolName string,
+	arguments map[string]any,
+) (*mcp.CallToolResult, error) {
+	// Check if closed before acquiring lock (fast path)
+	if m.closed.Load() {
+		return nil, fmt.Errorf("manager is closed")
+	}
+
+	m.mu.RLock()
+	// Double-check after acquiring lock to prevent TOCTOU race
+	if m.closed.Load() {
+		m.mu.RUnlock()
+		return nil, fmt.Errorf("manager is closed")
+	}
+	conn, ok := m.servers[serverName]
+	if ok {
+		m.wg.Add(1) // Add to WaitGroup while holding the lock
+	}
+	m.mu.RUnlock()
+
+	if !ok {
+		return nil, fmt.Errorf("server %s not found", serverName)
+	}
+	defer m.wg.Done()
+
+	params := &mcp.CallToolParams{
+		Name:      toolName,
+		Arguments: arguments,
+	}
+
+	result, err := conn.Session.CallTool(ctx, params)
+	if err != nil {
+		return nil, fmt.Errorf("failed to call tool: %w", err)
+	}
+
+	return result, nil
+}
+
+// Close closes all server connections
+func (m *Manager) Close() error {
+	// Use Swap to atomically set closed=true and get the previous value
+	// This prevents TOCTOU race with CallTool's closed check
+	if m.closed.Swap(true) {
+		return nil // already closed
+	}
+
+	// Wait for all in-flight CallTool calls to finish before closing sessions
+	// After closed=true is set, no new CallTool can start (they check closed first)
+	m.wg.Wait()
+
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	logger.InfoCF("mcp", "Closing all MCP server connections",
+		map[string]any{
+			"count": len(m.servers),
+		})
+
+	var errs []error
+	for name, conn := range m.servers {
+		if err := conn.Session.Close(); err != nil {
+			logger.ErrorCF("mcp", "Failed to close server connection",
+				map[string]any{
+					"server": name,
+					"error":  err.Error(),
+				})
+			errs = append(errs, fmt.Errorf("server %s: %w", name, err))
+		}
+	}
+
+	m.servers = make(map[string]*ServerConnection)
+
+	if len(errs) > 0 {
+		return fmt.Errorf("failed to close %d server(s): %w", len(errs), errors.Join(errs...))
+	}
+
+	return nil
+}
+
+// GetAllTools returns all tools from all connected servers
+func (m *Manager) GetAllTools() map[string][]*mcp.Tool {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	result := make(map[string][]*mcp.Tool)
+	for name, conn := range m.servers {
+		if len(conn.Tools) > 0 {
+			result[name] = conn.Tools
+		}
+	}
+	return result
+}

pkg/mcp/manager_test.go

@@ -0,0 +1,298 @@
+package mcp
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	sdkmcp "github.com/modelcontextprotocol/go-sdk/mcp"
+
+	"github.com/sipeed/picoclaw/pkg/config"
+)
+
+func TestLoadEnvFile(t *testing.T) {
+	tests := []struct {
+		name      string
+		content   string
+		expected  map[string]string
+		expectErr bool
+	}{
+		{
+			name: "basic env file",
+			content: `API_KEY=secret123
+DATABASE_URL=postgres://localhost/db
+PORT=8080`,
+			expected: map[string]string{
+				"API_KEY":      "secret123",
+				"DATABASE_URL": "postgres://localhost/db",
+				"PORT":         "8080",
+			},
+			expectErr: false,
+		},
+		{
+			name: "with comments and empty lines",
+			content: `# This is a comment
+API_KEY=secret123
+
+# Another comment
+DATABASE_URL=postgres://localhost/db
+
+PORT=8080`,
+			expected: map[string]string{
+				"API_KEY":      "secret123",
+				"DATABASE_URL": "postgres://localhost/db",
+				"PORT":         "8080",
+			},
+			expectErr: false,
+		},
+		{
+			name: "with quoted values",
+			content: `API_KEY="secret with spaces"
+NAME='single quoted'
+PLAIN=no-quotes`,
+			expected: map[string]string{
+				"API_KEY": "secret with spaces",
+				"NAME":    "single quoted",
+				"PLAIN":   "no-quotes",
+			},
+			expectErr: false,
+		},
+		{
+			name: "with spaces around equals",
+			content: `API_KEY = secret123
+DATABASE_URL= postgres://localhost/db
+PORT =8080`,
+			expected: map[string]string{
+				"API_KEY":      "secret123",
+				"DATABASE_URL": "postgres://localhost/db",
+				"PORT":         "8080",
+			},
+			expectErr: false,
+		},
+		{
+			name:      "invalid format - no equals",
+			content:   `INVALID_LINE`,
+			expectErr: true,
+		},
+		{
+			name:      "empty file",
+			content:   ``,
+			expected:  map[string]string{},
+			expectErr: false,
+		},
+		{
+			name: "only comments",
+			content: `# Comment 1
+# Comment 2`,
+			expected:  map[string]string{},
+			expectErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tmpDir := t.TempDir()
+			envFile := filepath.Join(tmpDir, ".env")
+
+			if err := os.WriteFile(envFile, []byte(tt.content), 0o644); err != nil {
+				t.Fatalf("Failed to create test file: %v", err)
+			}
+
+			result, err := loadEnvFile(envFile)
+
+			if tt.expectErr {
+				if err == nil {
+					t.Errorf("Expected error but got none")
+				}
+				return
+			}
+
+			if err != nil {
+				t.Errorf("Unexpected error: %v", err)
+				return
+			}
+
+			if len(result) != len(tt.expected) {
+				t.Errorf("Expected %d variables, got %d", len(tt.expected), len(result))
+			}
+
+			for key, expectedValue := range tt.expected {
+				if actualValue, ok := result[key]; !ok {
+					t.Errorf("Expected key %s not found", key)
+				} else if actualValue != expectedValue {
+					t.Errorf("For key %s: expected %q, got %q", key, expectedValue, actualValue)
+				}
+			}
+		})
+	}
+}
+
+func TestLoadEnvFileNotFound(t *testing.T) {
+	_, err := loadEnvFile("/nonexistent/file.env")
+	if err == nil {
+		t.Error("Expected error for nonexistent file")
+	}
+}
+
+func TestEnvFilePriority(t *testing.T) {
+	// Create a temporary .env file
+	tmpDir := t.TempDir()
+	envFile := filepath.Join(tmpDir, ".env")
+
+	envContent := `API_KEY=from_file
+DATABASE_URL=from_file
+SHARED_VAR=from_file`
+
+	if err := os.WriteFile(envFile, []byte(envContent), 0o644); err != nil {
+		t.Fatalf("Failed to create .env file: %v", err)
+	}
+
+	// Load envFile
+	envVars, err := loadEnvFile(envFile)
+	if err != nil {
+		t.Fatalf("Failed to load env file: %v", err)
+	}
+
+	// Verify envFile variables
+	if envVars["API_KEY"] != "from_file" {
+		t.Errorf("Expected API_KEY=from_file, got %s", envVars["API_KEY"])
+	}
+
+	// Simulate config.Env overriding envFile
+	configEnv := map[string]string{
+		"SHARED_VAR": "from_config",
+		"NEW_VAR":    "from_config",
+	}
+
+	// Merge: envFile first, then config overrides
+	merged := make(map[string]string)
+	for k, v := range envVars {
+		merged[k] = v
+	}
+	for k, v := range configEnv {
+		merged[k] = v
+	}
+
+	// Verify priority: config.Env should override envFile
+	if merged["SHARED_VAR"] != "from_config" {
+		t.Errorf(
+			"Expected SHARED_VAR=from_config (config should override file), got %s",
+			merged["SHARED_VAR"],
+		)
+	}
+	if merged["API_KEY"] != "from_file" {
+		t.Errorf("Expected API_KEY=from_file, got %s", merged["API_KEY"])
+	}
+	if merged["NEW_VAR"] != "from_config" {
+		t.Errorf("Expected NEW_VAR=from_config, got %s", merged["NEW_VAR"])
+	}
+}
+
+func TestLoadFromMCPConfig_EmptyWorkspaceWithRelativeEnvFile(t *testing.T) {
+	mgr := NewManager()
+
+	mcpCfg := config.MCPConfig{
+		Enabled: true,
+		Servers: map[string]config.MCPServerConfig{
+			"test-server": {
+				Enabled: true,
+				Command: "echo",
+				Args:    []string{"ok"},
+				EnvFile: ".env",
+			},
+		},
+	}
+
+	err := mgr.LoadFromMCPConfig(context.Background(), mcpCfg, "")
+	if err == nil {
+		t.Fatal("expected error for relative env_file with empty workspace path, got nil")
+	}
+
+	if !strings.Contains(err.Error(), "workspace path is empty") {
+		t.Fatalf("expected workspace path validation error, got: %v", err)
+	}
+}
+
+func TestNewManager_InitialState(t *testing.T) {
+	mgr := NewManager()
+	if mgr == nil {
+		t.Fatal("expected manager instance, got nil")
+	}
+	if len(mgr.GetServers()) != 0 {
+		t.Fatalf("expected no servers on new manager, got %d", len(mgr.GetServers()))
+	}
+}
+
+func TestLoadFromMCPConfig_DisabledOrEmptyServers(t *testing.T) {
+	mgr := NewManager()
+
+	err := mgr.LoadFromMCPConfig(context.Background(), config.MCPConfig{Enabled: false}, "/tmp")
+	if err != nil {
+		t.Fatalf("expected nil error when MCP disabled, got: %v", err)
+	}
+
+	err = mgr.LoadFromMCPConfig(context.Background(), config.MCPConfig{Enabled: true}, "/tmp")
+	if err != nil {
+		t.Fatalf("expected nil error when no servers configured, got: %v", err)
+	}
+}
+
+func TestGetServers_ReturnsCopy(t *testing.T) {
+	mgr := NewManager()
+	mgr.servers["s1"] = &ServerConnection{Name: "s1"}
+
+	servers := mgr.GetServers()
+	delete(servers, "s1")
+
+	if _, ok := mgr.GetServer("s1"); !ok {
+		t.Fatal("expected internal manager state to remain unchanged")
+	}
+}
+
+func TestGetAllTools_FiltersEmptyTools(t *testing.T) {
+	mgr := NewManager()
+	mgr.servers["empty"] = &ServerConnection{Name: "empty", Tools: nil}
+	mgr.servers["with-tools"] = &ServerConnection{Name: "with-tools", Tools: []*sdkmcp.Tool{{}}}
+
+	all := mgr.GetAllTools()
+	if _, ok := all["empty"]; ok {
+		t.Fatal("expected server without tools to be excluded")
+	}
+	if _, ok := all["with-tools"]; !ok {
+		t.Fatal("expected server with tools to be included")
+	}
+}
+
+func TestCallTool_ErrorsForClosedOrMissingServer(t *testing.T) {
+	t.Run("manager closed", func(t *testing.T) {
+		mgr := NewManager()
+		mgr.closed.Store(true)
+
+		_, err := mgr.CallTool(context.Background(), "s1", "tool", nil)
+		if err == nil || !strings.Contains(err.Error(), "manager is closed") {
+			t.Fatalf("expected manager closed error, got: %v", err)
+		}
+	})
+
+	t.Run("server missing", func(t *testing.T) {
+		mgr := NewManager()
+
+		_, err := mgr.CallTool(context.Background(), "missing", "tool", nil)
+		if err == nil || !strings.Contains(err.Error(), "not found") {
+			t.Fatalf("expected server not found error, got: %v", err)
+		}
+	})
+}
+
+func TestClose_IdempotentOnEmptyManager(t *testing.T) {
+	mgr := NewManager()
+
+	if err := mgr.Close(); err != nil {
+		t.Fatalf("first close should succeed, got: %v", err)
+	}
+	if err := mgr.Close(); err != nil {
+		t.Fatalf("second close should be idempotent, got: %v", err)
+	}
+}

pkg/providers/factory.go

@@ -102,6 +102,15 @@ func resolveProviderSelection(cfg *config.Config) (providerSelection, error) {
 					sel.apiBase = "https://openrouter.ai/api/v1"
 				}
 			}
+		case "litellm":
+			if cfg.Providers.LiteLLM.APIKey != "" || cfg.Providers.LiteLLM.APIBase != "" {
+				sel.apiKey = cfg.Providers.LiteLLM.APIKey
+				sel.apiBase = cfg.Providers.LiteLLM.APIBase
+				sel.proxy = cfg.Providers.LiteLLM.Proxy
+				if sel.apiBase == "" {
+					sel.apiBase = "http://localhost:4000/v1"
+				}
+			}
 		case "zhipu", "glm":
 			if cfg.Providers.Zhipu.APIKey != "" {
 				sel.apiKey = cfg.Providers.Zhipu.APIKey

pkg/providers/factory_provider.go

@@ -53,7 +53,7 @@ func ExtractProtocol(model string) (protocol, modelID string) {
 
 // CreateProviderFromConfig creates a provider based on the ModelConfig.
 // It uses the protocol prefix in the Model field to determine which provider to create.
-// Supported protocols: openai, anthropic, antigravity, claude-cli, codex-cli, github-copilot
+// Supported protocols: openai, litellm, anthropic, antigravity, claude-cli, codex-cli, github-copilot
 // Returns the provider, the model ID (without protocol prefix), and any error.
 func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, error) {
 	if cfg == nil {
@@ -92,7 +92,7 @@ func CreateProviderFromConfig(cfg *config.ModelConfig) (LLMProvider, string, err
 			cfg.RequestTimeout,
 		), modelID, nil
 
-	case "openrouter", "groq", "zhipu", "gemini", "nvidia",
+	case "litellm", "openrouter", "groq", "zhipu", "gemini", "nvidia",
 		"ollama", "moonshot", "shengsuanyun", "deepseek", "cerebras",
 		"volcengine", "vllm", "qwen", "mistral":
 		// All other OpenAI-compatible HTTP providers
@@ -180,6 +180,8 @@ func getDefaultAPIBase(protocol string) string {
 		return "https://api.openai.com/v1"
 	case "openrouter":
 		return "https://openrouter.ai/api/v1"
+	case "litellm":
+		return "http://localhost:4000/v1"
 	case "groq":
 		return "https://api.groq.com/openai/v1"
 	case "zhipu":

pkg/providers/factory_provider_test.go

@@ -135,6 +135,32 @@ func TestCreateProviderFromConfig_DefaultAPIBase(t *testing.T) {
 	}
 }
 
+func TestGetDefaultAPIBase_LiteLLM(t *testing.T) {
+	if got := getDefaultAPIBase("litellm"); got != "http://localhost:4000/v1" {
+		t.Fatalf("getDefaultAPIBase(%q) = %q, want %q", "litellm", got, "http://localhost:4000/v1")
+	}
+}
+
+func TestCreateProviderFromConfig_LiteLLM(t *testing.T) {
+	cfg := &config.ModelConfig{
+		ModelName: "test-litellm",
+		Model:     "litellm/my-proxy-alias",
+		APIKey:    "test-key",
+		APIBase:   "http://localhost:4000/v1",
+	}
+
+	provider, modelID, err := CreateProviderFromConfig(cfg)
+	if err != nil {
+		t.Fatalf("CreateProviderFromConfig() error = %v", err)
+	}
+	if provider == nil {
+		t.Fatal("CreateProviderFromConfig() returned nil provider")
+	}
+	if modelID != "my-proxy-alias" {
+		t.Errorf("modelID = %q, want %q", modelID, "my-proxy-alias")
+	}
+}
+
 func TestCreateProviderFromConfig_Anthropic(t *testing.T) {
 	cfg := &config.ModelConfig{
 		ModelName: "test-anthropic",

pkg/providers/factory_test.go

@@ -17,6 +17,27 @@ func TestResolveProviderSelection(t *testing.T) {
 		wantProxy     string
 		wantErrSubstr string
 	}{
+		{
+			name: "explicit litellm provider uses configured base",
+			setup: func(cfg *config.Config) {
+				cfg.Agents.Defaults.Provider = "litellm"
+				cfg.Providers.LiteLLM.APIKey = "litellm-key"
+				cfg.Providers.LiteLLM.APIBase = "http://localhost:4000/v1"
+				cfg.Providers.LiteLLM.Proxy = "http://127.0.0.1:7890"
+			},
+			wantType:    providerTypeHTTPCompat,
+			wantAPIBase: "http://localhost:4000/v1",
+			wantProxy:   "http://127.0.0.1:7890",
+		},
+		{
+			name: "explicit litellm provider defaults base when only key is configured",
+			setup: func(cfg *config.Config) {
+				cfg.Agents.Defaults.Provider = "litellm"
+				cfg.Providers.LiteLLM.APIKey = "litellm-key"
+			},
+			wantType:    providerTypeHTTPCompat,
+			wantAPIBase: "http://localhost:4000/v1",
+		},
 		{
 			name: "explicit claude-cli provider routes to cli provider type",
 			setup: func(cfg *config.Config) {

pkg/providers/openai_compat/provider.go

@@ -116,7 +116,7 @@ func (p *Provider) Chat(
 
 	requestBody := map[string]any{
 		"model":    model,
-		"messages": stripSystemParts(messages),
+		"messages": serializeMessages(messages),
 	}
 
 	if len(tools) > 0 {
@@ -296,19 +296,55 @@ type openaiMessage struct {
 	ToolCallID       string     `json:"tool_call_id,omitempty"`
 }
 
-// stripSystemParts converts []Message to []openaiMessage, dropping the
+// serializeMessages converts internal Message structs to the OpenAI wire format.
-// SystemParts field so it doesn't leak into the JSON payload sent to
+// - Strips SystemParts (unknown to third-party endpoints)
-// OpenAI-compatible APIs (some strict endpoints reject unknown fields).
+// - Converts messages with Media to multipart content format (text + image_url parts)
-func stripSystemParts(messages []Message) []openaiMessage {
+// - Preserves ToolCallID, ToolCalls, and ReasoningContent for all messages
-	out := make([]openaiMessage, len(messages))
+func serializeMessages(messages []Message) []any {
-	for i, m := range messages {
+	out := make([]any, 0, len(messages))
-		out[i] = openaiMessage{
+	for _, m := range messages {
+		if len(m.Media) == 0 {
+			out = append(out, openaiMessage{
 				Role:             m.Role,
 				Content:          m.Content,
 				ReasoningContent: m.ReasoningContent,
 				ToolCalls:        m.ToolCalls,
 				ToolCallID:       m.ToolCallID,
+			})
+			continue
 		}
+
+		// Multipart content format for messages with media
+		parts := make([]map[string]any, 0, 1+len(m.Media))
+		if m.Content != "" {
+			parts = append(parts, map[string]any{
+				"type": "text",
+				"text": m.Content,
+			})
+		}
+		for _, mediaURL := range m.Media {
+			parts = append(parts, map[string]any{
+				"type": "image_url",
+				"image_url": map[string]any{
+					"url": mediaURL,
+				},
+			})
+		}
+
+		msg := map[string]any{
+			"role":    m.Role,
+			"content": parts,
+		}
+		if m.ToolCallID != "" {
+			msg["tool_call_id"] = m.ToolCallID
+		}
+		if len(m.ToolCalls) > 0 {
+			msg["tool_calls"] = m.ToolCalls
+		}
+		if m.ReasoningContent != "" {
+			msg["reasoning_content"] = m.ReasoningContent
+		}
+		out = append(out, msg)
 	}
 	return out
 }
@@ -325,7 +361,7 @@ func normalizeModel(model, apiBase string) string {
 
 	prefix := strings.ToLower(before)
 	switch prefix {
-	case "moonshot", "nvidia", "groq", "ollama", "deepseek", "google", "openrouter", "zhipu", "mistral":
+	case "litellm", "moonshot", "nvidia", "groq", "ollama", "deepseek", "google", "openrouter", "zhipu", "mistral":
 		return after
 	default:
 		return model

pkg/providers/openai_compat/provider_test.go

@@ -5,8 +5,11 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"net/url"
+	"strings"
 	"testing"
 	"time"
+
+	"github.com/sipeed/picoclaw/pkg/providers/protocoltypes"
 )
 
 func TestProviderChat_UsesMaxCompletionTokensForGLM(t *testing.T) {
@@ -256,6 +259,11 @@ func TestProviderChat_StripsGroqAndOllamaPrefixes(t *testing.T) {
 		input     string
 		wantModel string
 	}{
+		{
+			name:      "strips litellm prefix and preserves proxy model name",
+			input:     "litellm/my-proxy-alias",
+			wantModel: "my-proxy-alias",
+		},
 		{
 			name:      "strips groq prefix and keeps nested model",
 			input:     "groq/openai/gpt-oss-120b",
@@ -411,3 +419,97 @@ func TestProvider_FunctionalOptionRequestTimeoutNonPositive(t *testing.T) {
 		t.Fatalf("http timeout = %v, want %v", p.httpClient.Timeout, defaultRequestTimeout)
 	}
 }
+
+func TestSerializeMessages_PlainText(t *testing.T) {
+	messages := []protocoltypes.Message{
+		{Role: "user", Content: "hello"},
+		{Role: "assistant", Content: "hi", ReasoningContent: "thinking..."},
+	}
+	result := serializeMessages(messages)
+
+	data, err := json.Marshal(result)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var msgs []map[string]any
+	json.Unmarshal(data, &msgs)
+
+	if msgs[0]["content"] != "hello" {
+		t.Fatalf("expected plain string content, got %v", msgs[0]["content"])
+	}
+	if msgs[1]["reasoning_content"] != "thinking..." {
+		t.Fatalf("reasoning_content not preserved, got %v", msgs[1]["reasoning_content"])
+	}
+}
+
+func TestSerializeMessages_WithMedia(t *testing.T) {
+	messages := []protocoltypes.Message{
+		{Role: "user", Content: "describe this", Media: []string{"data:image/png;base64,abc123"}},
+	}
+	result := serializeMessages(messages)
+
+	data, _ := json.Marshal(result)
+	var msgs []map[string]any
+	json.Unmarshal(data, &msgs)
+
+	content, ok := msgs[0]["content"].([]any)
+	if !ok {
+		t.Fatalf("expected array content for media message, got %T", msgs[0]["content"])
+	}
+	if len(content) != 2 {
+		t.Fatalf("expected 2 content parts, got %d", len(content))
+	}
+
+	textPart := content[0].(map[string]any)
+	if textPart["type"] != "text" || textPart["text"] != "describe this" {
+		t.Fatalf("text part mismatch: %v", textPart)
+	}
+
+	imgPart := content[1].(map[string]any)
+	if imgPart["type"] != "image_url" {
+		t.Fatalf("expected image_url type, got %v", imgPart["type"])
+	}
+	imgURL := imgPart["image_url"].(map[string]any)
+	if imgURL["url"] != "data:image/png;base64,abc123" {
+		t.Fatalf("image url mismatch: %v", imgURL["url"])
+	}
+}
+
+func TestSerializeMessages_MediaWithToolCallID(t *testing.T) {
+	messages := []protocoltypes.Message{
+		{Role: "tool", Content: "image result", Media: []string{"data:image/png;base64,xyz"}, ToolCallID: "call_1"},
+	}
+	result := serializeMessages(messages)
+
+	data, _ := json.Marshal(result)
+	var msgs []map[string]any
+	json.Unmarshal(data, &msgs)
+
+	if msgs[0]["tool_call_id"] != "call_1" {
+		t.Fatalf("tool_call_id not preserved with media, got %v", msgs[0]["tool_call_id"])
+	}
+	// Content should be multipart array
+	if _, ok := msgs[0]["content"].([]any); !ok {
+		t.Fatalf("expected array content, got %T", msgs[0]["content"])
+	}
+}
+
+func TestSerializeMessages_StripsSystemParts(t *testing.T) {
+	messages := []protocoltypes.Message{
+		{
+			Role:    "system",
+			Content: "you are helpful",
+			SystemParts: []protocoltypes.ContentBlock{
+				{Type: "text", Text: "you are helpful"},
+			},
+		},
+	}
+	result := serializeMessages(messages)
+
+	data, _ := json.Marshal(result)
+	raw := string(data)
+	if strings.Contains(raw, "system_parts") {
+		t.Fatal("system_parts should not appear in serialized output")
+	}
+}

pkg/providers/protocoltypes/types.go

@@ -65,6 +65,7 @@ type ContentBlock struct {
 type Message struct {
 	Role             string         `json:"role"`
 	Content          string         `json:"content"`
+	Media            []string       `json:"media,omitempty"`
 	ReasoningContent string         `json:"reasoning_content,omitempty"`
 	SystemParts      []ContentBlock `json:"system_parts,omitempty"` // structured system blocks for cache-aware adapters
 	ToolCalls        []ToolCall     `json:"tool_calls,omitempty"`

pkg/skills/loader.go

@@ -64,6 +64,29 @@ type SkillsLoader struct {
 	builtinSkills   string // builtin skills
 }
 
+// SkillRoots returns all unique skill root directories used by this loader.
+// The order follows resolution priority: workspace > global > builtin.
+func (sl *SkillsLoader) SkillRoots() []string {
+	roots := []string{sl.workspaceSkills, sl.globalSkills, sl.builtinSkills}
+	seen := make(map[string]struct{}, len(roots))
+	out := make([]string, 0, len(roots))
+
+	for _, root := range roots {
+		trimmed := strings.TrimSpace(root)
+		if trimmed == "" {
+			continue
+		}
+		clean := filepath.Clean(trimmed)
+		if _, ok := seen[clean]; ok {
+			continue
+		}
+		seen[clean] = struct{}{}
+		out = append(out, clean)
+	}
+
+	return out
+}
+
 func NewSkillsLoader(workspace string, globalSkills string, builtinSkills string) *SkillsLoader {
 	return &SkillsLoader{
 		workspace:       workspace,

pkg/skills/loader_test.go

@@ -326,3 +326,19 @@ func TestStripFrontmatter(t *testing.T) {
 		})
 	}
 }
+
+func TestSkillRootsTrimsWhitespaceAndDedups(t *testing.T) {
+	tmp := t.TempDir()
+	workspace := filepath.Join(tmp, "workspace")
+	global := filepath.Join(tmp, "global")
+	builtin := filepath.Join(tmp, "builtin")
+
+	sl := NewSkillsLoader(workspace, "  "+global+"  ", "\t"+builtin+"\n")
+	roots := sl.SkillRoots()
+
+	assert.Equal(t, []string{
+		filepath.Join(workspace, "skills"),
+		global,
+		builtin,
+	}, roots)
+}

pkg/tools/mcp_tool.go

@@ -0,0 +1,246 @@
+package tools
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"hash/fnv"
+	"strings"
+
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+)
+
+// MCPManager defines the interface for MCP manager operations
+// This allows for easier testing with mock implementations
+type MCPManager interface {
+	CallTool(
+		ctx context.Context,
+		serverName, toolName string,
+		arguments map[string]any,
+	) (*mcp.CallToolResult, error)
+}
+
+// MCPTool wraps an MCP tool to implement the Tool interface
+type MCPTool struct {
+	manager    MCPManager
+	serverName string
+	tool       *mcp.Tool
+}
+
+// NewMCPTool creates a new MCP tool wrapper
+func NewMCPTool(manager MCPManager, serverName string, tool *mcp.Tool) *MCPTool {
+	return &MCPTool{
+		manager:    manager,
+		serverName: serverName,
+		tool:       tool,
+	}
+}
+
+// sanitizeIdentifierComponent normalizes a string so it can be safely used
+// as part of a tool/function identifier for downstream providers.
+// It:
+//   - lowercases the string
+//   - replaces any character not in [a-z0-9_-] with '_'
+//   - collapses multiple consecutive '_' into a single '_'
+//   - trims leading/trailing '_'
+//   - falls back to "unnamed" if the result is empty
+//   - truncates overly long components to a reasonable length
+func sanitizeIdentifierComponent(s string) string {
+	const maxLen = 64
+
+	s = strings.ToLower(s)
+	var b strings.Builder
+	b.Grow(len(s))
+
+	prevUnderscore := false
+	for _, r := range s {
+		isAllowed := (r >= 'a' && r <= 'z') ||
+			(r >= '0' && r <= '9') ||
+			r == '_' || r == '-'
+
+		if !isAllowed {
+			// Normalize any disallowed character to '_'
+			if !prevUnderscore {
+				b.WriteRune('_')
+				prevUnderscore = true
+			}
+			continue
+		}
+
+		if r == '_' {
+			if prevUnderscore {
+				continue
+			}
+			prevUnderscore = true
+		} else {
+			prevUnderscore = false
+		}
+
+		b.WriteRune(r)
+	}
+
+	result := strings.Trim(b.String(), "_")
+	if result == "" {
+		result = "unnamed"
+	}
+
+	if len(result) > maxLen {
+		result = result[:maxLen]
+	}
+
+	return result
+}
+
+// Name returns the tool name, prefixed with the server name.
+// The total length is capped at 64 characters (OpenAI-compatible API limit).
+// A short hash of the original (unsanitized) server and tool names is appended
+// whenever sanitization is lossy or the name is truncated, ensuring that two
+// names which differ only in disallowed characters remain distinct after sanitization.
+func (t *MCPTool) Name() string {
+	// Prefix with server name to avoid conflicts, and sanitize components
+	sanitizedServer := sanitizeIdentifierComponent(t.serverName)
+	sanitizedTool := sanitizeIdentifierComponent(t.tool.Name)
+	full := fmt.Sprintf("mcp_%s_%s", sanitizedServer, sanitizedTool)
+
+	// Check if sanitization was lossless (only lowercasing, no char replacement/truncation)
+	lossless := strings.ToLower(t.serverName) == sanitizedServer &&
+		strings.ToLower(t.tool.Name) == sanitizedTool
+
+	const maxTotal = 64
+	if lossless && len(full) <= maxTotal {
+		return full
+	}
+
+	// Sanitization was lossy or name too long: append hash of the ORIGINAL names
+	// (not the sanitized names) so different originals always yield different hashes.
+	h := fnv.New32a()
+	_, _ = h.Write([]byte(t.serverName + "\x00" + t.tool.Name))
+	suffix := fmt.Sprintf("%08x", h.Sum32()) // 8 chars
+
+	base := full
+	if len(base) > maxTotal-9 {
+		base = strings.TrimRight(full[:maxTotal-9], "_")
+	}
+	return base + "_" + suffix
+}
+
+// Description returns the tool description
+func (t *MCPTool) Description() string {
+	desc := t.tool.Description
+	if desc == "" {
+		desc = fmt.Sprintf("MCP tool from %s server", t.serverName)
+	}
+	// Add server info to description
+	return fmt.Sprintf("[MCP:%s] %s", t.serverName, desc)
+}
+
+// Parameters returns the tool parameters schema
+func (t *MCPTool) Parameters() map[string]any {
+	// The InputSchema is already a JSON Schema object
+	schema := t.tool.InputSchema
+
+	// Handle nil schema
+	if schema == nil {
+		return map[string]any{
+			"type":       "object",
+			"properties": map[string]any{},
+			"required":   []string{},
+		}
+	}
+
+	// Try direct conversion first (fast path)
+	if schemaMap, ok := schema.(map[string]any); ok {
+		return schemaMap
+	}
+
+	// Handle json.RawMessage and []byte - unmarshal directly
+	var jsonData []byte
+	if rawMsg, ok := schema.(json.RawMessage); ok {
+		jsonData = rawMsg
+	} else if bytes, ok := schema.([]byte); ok {
+		jsonData = bytes
+	}
+
+	if jsonData != nil {
+		var result map[string]any
+		if err := json.Unmarshal(jsonData, &result); err == nil {
+			return result
+		}
+		// Fallback on error
+		return map[string]any{
+			"type":       "object",
+			"properties": map[string]any{},
+			"required":   []string{},
+		}
+	}
+
+	// For other types (structs, etc.), convert via JSON marshal/unmarshal
+	var err error
+	jsonData, err = json.Marshal(schema)
+	if err != nil {
+		// Fallback to empty schema if marshaling fails
+		return map[string]any{
+			"type":       "object",
+			"properties": map[string]any{},
+			"required":   []string{},
+		}
+	}
+
+	var result map[string]any
+	if err := json.Unmarshal(jsonData, &result); err != nil {
+		// Fallback to empty schema if unmarshaling fails
+		return map[string]any{
+			"type":       "object",
+			"properties": map[string]any{},
+			"required":   []string{},
+		}
+	}
+
+	return result
+}
+
+// Execute executes the MCP tool
+func (t *MCPTool) Execute(ctx context.Context, args map[string]any) *ToolResult {
+	result, err := t.manager.CallTool(ctx, t.serverName, t.tool.Name, args)
+	if err != nil {
+		return ErrorResult(fmt.Sprintf("MCP tool execution failed: %v", err)).WithError(err)
+	}
+
+	if result == nil {
+		nilErr := fmt.Errorf("MCP tool returned nil result without error")
+		return ErrorResult("MCP tool execution failed: nil result").WithError(nilErr)
+	}
+
+	// Handle error result from server
+	if result.IsError {
+		errMsg := extractContentText(result.Content)
+		return ErrorResult(fmt.Sprintf("MCP tool returned error: %s", errMsg)).
+			WithError(fmt.Errorf("MCP tool error: %s", errMsg))
+	}
+
+	// Extract text content from result
+	output := extractContentText(result.Content)
+
+	return &ToolResult{
+		ForLLM:  output,
+		IsError: false,
+	}
+}
+
+// extractContentText extracts text from MCP content array
+func extractContentText(content []mcp.Content) string {
+	var parts []string
+	for _, c := range content {
+		switch v := c.(type) {
+		case *mcp.TextContent:
+			parts = append(parts, v.Text)
+		case *mcp.ImageContent:
+			// For images, just indicate that an image was returned
+			parts = append(parts, fmt.Sprintf("[Image: %s]", v.MIMEType))
+		default:
+			// For other content types, use string representation
+			parts = append(parts, fmt.Sprintf("[Content: %T]", v))
+		}
+	}
+	return strings.Join(parts, "\n")
+}

pkg/tools/mcp_tool_test.go

@@ -0,0 +1,492 @@
+package tools
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"testing"
+
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+)
+
+// MockMCPManager is a mock implementation of MCPManager interface for testing
+type MockMCPManager struct {
+	callToolFunc func(ctx context.Context, serverName, toolName string, arguments map[string]any) (*mcp.CallToolResult, error)
+}
+
+func (m *MockMCPManager) CallTool(
+	ctx context.Context,
+	serverName, toolName string,
+	arguments map[string]any,
+) (*mcp.CallToolResult, error) {
+	if m.callToolFunc != nil {
+		return m.callToolFunc(ctx, serverName, toolName, arguments)
+	}
+	return &mcp.CallToolResult{
+		Content: []mcp.Content{
+			&mcp.TextContent{Text: "mock result"},
+		},
+		IsError: false,
+	}, nil
+}
+
+// TestNewMCPTool verifies MCP tool creation
+func TestNewMCPTool(t *testing.T) {
+	manager := &MockMCPManager{}
+	tool := &mcp.Tool{
+		Name:        "test_tool",
+		Description: "A test tool",
+		InputSchema: map[string]any{
+			"type": "object",
+			"properties": map[string]any{
+				"input": map[string]any{
+					"type":        "string",
+					"description": "Test input",
+				},
+			},
+		},
+	}
+
+	mcpTool := NewMCPTool(manager, "test_server", tool)
+
+	if mcpTool == nil {
+		t.Fatal("NewMCPTool should not return nil")
+	}
+	// Verify tool properties we can access
+	if mcpTool.Name() != "mcp_test_server_test_tool" {
+		t.Errorf("Expected tool name with prefix, got '%s'", mcpTool.Name())
+	}
+}
+
+// TestMCPTool_Name verifies tool name with server prefix
+func TestMCPTool_Name(t *testing.T) {
+	tests := []struct {
+		name       string
+		serverName string
+		toolName   string
+		expected   string
+	}{
+		{
+			name:       "simple name",
+			serverName: "github",
+			toolName:   "create_issue",
+			expected:   "mcp_github_create_issue",
+		},
+		{
+			name:       "filesystem server",
+			serverName: "filesystem",
+			toolName:   "read_file",
+			expected:   "mcp_filesystem_read_file",
+		},
+		{
+			name:       "remote server",
+			serverName: "remote-api",
+			toolName:   "fetch_data",
+			expected:   "mcp_remote-api_fetch_data",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			manager := &MockMCPManager{}
+			tool := &mcp.Tool{Name: tt.toolName}
+			mcpTool := NewMCPTool(manager, tt.serverName, tool)
+
+			result := mcpTool.Name()
+			if result != tt.expected {
+				t.Errorf("Expected name '%s', got '%s'", tt.expected, result)
+			}
+		})
+	}
+}
+
+// TestMCPTool_Description verifies tool description generation
+func TestMCPTool_Description(t *testing.T) {
+	tests := []struct {
+		name            string
+		serverName      string
+		toolDescription string
+		expectContains  []string
+	}{
+		{
+			name:            "with description",
+			serverName:      "github",
+			toolDescription: "Create a GitHub issue",
+			expectContains:  []string{"[MCP:github]", "Create a GitHub issue"},
+		},
+		{
+			name:            "empty description",
+			serverName:      "filesystem",
+			toolDescription: "",
+			expectContains:  []string{"[MCP:filesystem]", "MCP tool from filesystem server"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			manager := &MockMCPManager{}
+			tool := &mcp.Tool{
+				Name:        "test_tool",
+				Description: tt.toolDescription,
+			}
+			mcpTool := NewMCPTool(manager, tt.serverName, tool)
+
+			result := mcpTool.Description()
+
+			for _, expected := range tt.expectContains {
+				if !strings.Contains(result, expected) {
+					t.Errorf("Description should contain '%s', got: %s", expected, result)
+				}
+			}
+		})
+	}
+}
+
+// TestMCPTool_Parameters verifies parameter schema conversion
+func TestMCPTool_Parameters(t *testing.T) {
+	tests := []struct {
+		name           string
+		inputSchema    any
+		expectType     string
+		checkProperty  string
+		expectProperty bool
+	}{
+		{
+			name: "map schema",
+			inputSchema: map[string]any{
+				"type": "object",
+				"properties": map[string]any{
+					"query": map[string]any{
+						"type":        "string",
+						"description": "Search query",
+					},
+				},
+				"required": []string{"query"},
+			},
+			expectType:     "object",
+			checkProperty:  "query",
+			expectProperty: true,
+		},
+		{
+			name:           "nil schema",
+			inputSchema:    nil,
+			expectType:     "object",
+			expectProperty: false,
+		},
+		{
+			name: "json.RawMessage schema",
+			inputSchema: []byte(`{
+				"type": "object",
+				"properties": {
+					"repo": {
+						"type": "string",
+						"description": "Repository name"
+					},
+					"stars": {
+						"type": "integer",
+						"description": "Minimum stars"
+					}
+				},
+				"required": ["repo"]
+			}`),
+			expectType:     "object",
+			checkProperty:  "repo",
+			expectProperty: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			manager := &MockMCPManager{}
+			tool := &mcp.Tool{
+				Name:        "test_tool",
+				InputSchema: tt.inputSchema,
+			}
+			mcpTool := NewMCPTool(manager, "test_server", tool)
+
+			params := mcpTool.Parameters()
+
+			if params == nil {
+				t.Fatal("Parameters should not be nil")
+			}
+
+			if params["type"] != tt.expectType {
+				t.Errorf("Expected type '%s', got '%v'", tt.expectType, params["type"])
+			}
+
+			// Check if property exists when expected
+			if tt.checkProperty != "" {
+				properties, ok := params["properties"].(map[string]any)
+				if !ok && tt.expectProperty {
+					t.Errorf("Expected properties to be a map")
+					return
+				}
+				if ok {
+					_, hasProperty := properties[tt.checkProperty]
+					if hasProperty != tt.expectProperty {
+						t.Errorf("Expected property '%s' existence: %v, got: %v",
+							tt.checkProperty, tt.expectProperty, hasProperty)
+					}
+				}
+			}
+		})
+	}
+}
+
+// TestMCPTool_Execute_Success tests successful tool execution
+func TestMCPTool_Execute_Success(t *testing.T) {
+	manager := &MockMCPManager{
+		callToolFunc: func(ctx context.Context, serverName, toolName string, arguments map[string]any) (*mcp.CallToolResult, error) {
+			// Verify correct parameters passed
+			if serverName != "github" {
+				t.Errorf("Expected serverName 'github', got '%s'", serverName)
+			}
+			if toolName != "search_repos" {
+				t.Errorf("Expected toolName 'search_repos', got '%s'", toolName)
+			}
+
+			return &mcp.CallToolResult{
+				Content: []mcp.Content{
+					&mcp.TextContent{Text: "Found 3 repositories"},
+				},
+				IsError: false,
+			}, nil
+		},
+	}
+
+	tool := &mcp.Tool{
+		Name:        "search_repos",
+		Description: "Search GitHub repositories",
+	}
+	mcpTool := NewMCPTool(manager, "github", tool)
+
+	ctx := context.Background()
+	args := map[string]any{
+		"query": "golang mcp",
+	}
+
+	result := mcpTool.Execute(ctx, args)
+
+	if result == nil {
+		t.Fatal("Result should not be nil")
+	}
+	if result.IsError {
+		t.Errorf("Expected no error, got error: %s", result.ForLLM)
+	}
+	if result.ForLLM != "Found 3 repositories" {
+		t.Errorf("Expected 'Found 3 repositories', got '%s'", result.ForLLM)
+	}
+}
+
+// TestMCPTool_Execute_ManagerError tests execution when manager returns error
+func TestMCPTool_Execute_ManagerError(t *testing.T) {
+	manager := &MockMCPManager{
+		callToolFunc: func(ctx context.Context, serverName, toolName string, arguments map[string]any) (*mcp.CallToolResult, error) {
+			return nil, fmt.Errorf("connection failed")
+		},
+	}
+
+	tool := &mcp.Tool{Name: "test_tool"}
+	mcpTool := NewMCPTool(manager, "test_server", tool)
+
+	ctx := context.Background()
+	result := mcpTool.Execute(ctx, map[string]any{})
+
+	if result == nil {
+		t.Fatal("Result should not be nil")
+	}
+	if !result.IsError {
+		t.Error("Expected IsError to be true")
+	}
+	if !strings.Contains(result.ForLLM, "MCP tool execution failed") {
+		t.Errorf("Error message should mention execution failure, got: %s", result.ForLLM)
+	}
+	if !strings.Contains(result.ForLLM, "connection failed") {
+		t.Errorf("Error message should include original error, got: %s", result.ForLLM)
+	}
+}
+
+// TestMCPTool_Execute_ServerError tests execution when server returns error
+func TestMCPTool_Execute_ServerError(t *testing.T) {
+	manager := &MockMCPManager{
+		callToolFunc: func(ctx context.Context, serverName, toolName string, arguments map[string]any) (*mcp.CallToolResult, error) {
+			return &mcp.CallToolResult{
+				Content: []mcp.Content{
+					&mcp.TextContent{Text: "Invalid API key"},
+				},
+				IsError: true,
+			}, nil
+		},
+	}
+
+	tool := &mcp.Tool{Name: "test_tool"}
+	mcpTool := NewMCPTool(manager, "test_server", tool)
+
+	ctx := context.Background()
+	result := mcpTool.Execute(ctx, map[string]any{})
+
+	if result == nil {
+		t.Fatal("Result should not be nil")
+	}
+	if !result.IsError {
+		t.Error("Expected IsError to be true")
+	}
+	if !strings.Contains(result.ForLLM, "MCP tool returned error") {
+		t.Errorf("Error message should mention server error, got: %s", result.ForLLM)
+	}
+	if !strings.Contains(result.ForLLM, "Invalid API key") {
+		t.Errorf("Error message should include server message, got: %s", result.ForLLM)
+	}
+}
+
+// TestMCPTool_Execute_MultipleContent tests execution with multiple content items
+func TestMCPTool_Execute_MultipleContent(t *testing.T) {
+	manager := &MockMCPManager{
+		callToolFunc: func(ctx context.Context, serverName, toolName string, arguments map[string]any) (*mcp.CallToolResult, error) {
+			return &mcp.CallToolResult{
+				Content: []mcp.Content{
+					&mcp.TextContent{Text: "First line"},
+					&mcp.TextContent{Text: "Second line"},
+					&mcp.TextContent{Text: "Third line"},
+				},
+				IsError: false,
+			}, nil
+		},
+	}
+
+	tool := &mcp.Tool{Name: "multi_output"}
+	mcpTool := NewMCPTool(manager, "test_server", tool)
+
+	ctx := context.Background()
+	result := mcpTool.Execute(ctx, map[string]any{})
+
+	if result.IsError {
+		t.Errorf("Expected no error, got: %s", result.ForLLM)
+	}
+
+	expected := "First line\nSecond line\nThird line"
+	if result.ForLLM != expected {
+		t.Errorf("Expected '%s', got '%s'", expected, result.ForLLM)
+	}
+}
+
+// TestExtractContentText_TextContent tests text content extraction
+func TestExtractContentText_TextContent(t *testing.T) {
+	content := []mcp.Content{
+		&mcp.TextContent{Text: "Hello World"},
+		&mcp.TextContent{Text: "Second message"},
+	}
+
+	result := extractContentText(content)
+	expected := "Hello World\nSecond message"
+
+	if result != expected {
+		t.Errorf("Expected '%s', got '%s'", expected, result)
+	}
+}
+
+// TestExtractContentText_ImageContent tests image content extraction
+func TestExtractContentText_ImageContent(t *testing.T) {
+	content := []mcp.Content{
+		&mcp.ImageContent{
+			Data:     []byte("base64data"),
+			MIMEType: "image/png",
+		},
+	}
+
+	result := extractContentText(content)
+
+	if !strings.Contains(result, "[Image:") {
+		t.Errorf("Expected image indicator, got: %s", result)
+	}
+	if !strings.Contains(result, "image/png") {
+		t.Errorf("Expected MIME type in output, got: %s", result)
+	}
+}
+
+// TestExtractContentText_MixedContent tests mixed content types
+func TestExtractContentText_MixedContent(t *testing.T) {
+	content := []mcp.Content{
+		&mcp.TextContent{Text: "Description"},
+		&mcp.ImageContent{
+			Data:     []byte("data"),
+			MIMEType: "image/jpeg",
+		},
+		&mcp.TextContent{Text: "More text"},
+	}
+
+	result := extractContentText(content)
+
+	if !strings.Contains(result, "Description") {
+		t.Errorf("Should contain text content, got: %s", result)
+	}
+	if !strings.Contains(result, "[Image:") {
+		t.Errorf("Should contain image indicator, got: %s", result)
+	}
+	if !strings.Contains(result, "More text") {
+		t.Errorf("Should contain second text, got: %s", result)
+	}
+}
+
+// TestExtractContentText_EmptyContent tests empty content array
+func TestExtractContentText_EmptyContent(t *testing.T) {
+	content := []mcp.Content{}
+
+	result := extractContentText(content)
+
+	if result != "" {
+		t.Errorf("Expected empty string for empty content, got: %s", result)
+	}
+}
+
+// TestMCPTool_InterfaceCompliance verifies MCPTool implements Tool interface
+func TestMCPTool_InterfaceCompliance(t *testing.T) {
+	manager := &MockMCPManager{}
+	tool := &mcp.Tool{Name: "test"}
+	mcpTool := NewMCPTool(manager, "test_server", tool)
+
+	// Verify it implements Tool interface
+	var _ Tool = mcpTool
+}
+
+// TestMCPTool_Parameters_MapSchema tests schema that's already a map
+func TestMCPTool_Parameters_MapSchema(t *testing.T) {
+	manager := &MockMCPManager{}
+	schema := map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"name": map[string]any{
+				"type":        "string",
+				"description": "The name parameter",
+			},
+		},
+		"required": []string{"name"},
+	}
+
+	tool := &mcp.Tool{
+		Name:        "test_tool",
+		InputSchema: schema,
+	}
+	mcpTool := NewMCPTool(manager, "test_server", tool)
+
+	params := mcpTool.Parameters()
+
+	// Should return the schema as-is when it's already a map
+	if params["type"] != "object" {
+		t.Errorf("Expected type 'object', got '%v'", params["type"])
+	}
+
+	props, ok := params["properties"].(map[string]any)
+	if !ok {
+		t.Error("Properties should be a map")
+	}
+
+	nameParam, ok := props["name"].(map[string]any)
+	if !ok {
+		t.Error("Name parameter should exist")
+	}
+
+	if nameParam["type"] != "string" {
+		t.Errorf("Name type should be 'string', got '%v'", nameParam["type"])
+	}
+}

pkg/tools/registry.go

@@ -25,7 +25,12 @@ func NewToolRegistry() *ToolRegistry {
 func (r *ToolRegistry) Register(tool Tool) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
-	r.tools[tool.Name()] = tool
+	name := tool.Name()
+	if _, exists := r.tools[name]; exists {
+		logger.WarnCF("tools", "Tool registration overwrites existing tool",
+			map[string]any{"name": name})
+	}
+	r.tools[name] = tool
 }
 
 func (r *ToolRegistry) Get(name string) (Tool, bool) {

pkg/tools/web.go

@@ -109,6 +109,10 @@ func (p *BraveSearchProvider) Search(ctx context.Context, query string, count in
 		return "", fmt.Errorf("failed to read response: %w", err)
 	}
 
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("brave api error (status %d): %s", resp.StatusCode, string(body))
+	}
+
 	var searchResp struct {
 		Web struct {
 			Results []struct {

scripts/test-docker-mcp.sh

@@ -0,0 +1,49 @@
+#!/bin/sh
+# Test script for MCP tools in Docker (full-featured image)
+
+set -e
+
+COMPOSE_FILE="docker/docker-compose.full.yml"
+SERVICE="picoclaw-agent"
+
+echo "🧪 Testing MCP tools in Docker container (full-featured image)..."
+echo ""
+
+# Build the image
+echo "📦 Building Docker image..."
+docker compose -f "$COMPOSE_FILE" build "$SERVICE"
+
+# Test npx
+echo "✅ Testing npx..."
+docker compose -f "$COMPOSE_FILE" run --rm --entrypoint sh "$SERVICE" -c 'npx --version'
+
+# Test npm
+echo "✅ Testing npm..."
+docker compose -f "$COMPOSE_FILE" run --rm --entrypoint sh "$SERVICE" -c 'npm --version'
+
+# Test node
+echo "✅ Testing Node.js..."
+docker compose -f "$COMPOSE_FILE" run --rm --entrypoint sh "$SERVICE" -c 'node --version'
+
+# Test git
+echo "✅ Testing git..."
+docker compose -f "$COMPOSE_FILE" run --rm --entrypoint sh "$SERVICE" -c 'git --version'
+
+# Test python
+echo "✅ Testing Python..."
+docker compose -f "$COMPOSE_FILE" run --rm --entrypoint sh "$SERVICE" -c 'python3 --version'
+
+# Test uv
+echo "✅ Testing uv..."
+docker compose -f "$COMPOSE_FILE" run --rm --entrypoint sh "$SERVICE" -c 'uv --version'
+
+# Test MCP server installation (quick)
+echo "✅ Testing @modelcontextprotocol/server-filesystem MCP server install with npx..."
+docker compose -f "$COMPOSE_FILE" run --rm --entrypoint sh "$SERVICE" -c '</dev/null timeout 5 npx -y @modelcontextprotocol/server-filesystem /tmp || true'
+
+echo ""
+echo "🎉 All MCP tools are working correctly!"
+echo ""
+echo "Next steps:"
+echo "  1. Configure MCP servers in config/config.json"
+echo "  2. Run: docker compose -f $COMPOSE_FILE --profile gateway up"