From 0aba48cc042c97724f64c843fd19f570d831711d Mon Sep 17 00:00:00 2001 From: harmoon Date: Tue, 31 Mar 2026 11:39:48 +0800 Subject: [PATCH] docs(hooks): add JSON-RPC protocol and plugin tool injection documentation Add comprehensive documentation for hook JSON-RPC protocol and plugin tool injection capabilities: - Add "Hook Actions" section to README.zh.md explaining respond action for tool execution bypass - Create hook-json-protocol.md/.zh.md detailing JSON-RPC 2.0 protocol for all hook methods - Create plugin-tool-injection.md/.zh.md with complete examples for external tool implementation - Document how hooks can inject tool definitions and return results via respond action - Include Python and Go examples for weather query plugin implementation --- docs/hooks/README.zh.md | 63 +++ docs/hooks/hook-json-protocol.md | 568 +++++++++++++++++++++++++ docs/hooks/hook-json-protocol.zh.md | 568 +++++++++++++++++++++++++ docs/hooks/plugin-tool-injection.md | 467 ++++++++++++++++++++ docs/hooks/plugin-tool-injection.zh.md | 467 ++++++++++++++++++++ 5 files changed, 2133 insertions(+) create mode 100644 docs/hooks/hook-json-protocol.md create mode 100644 docs/hooks/hook-json-protocol.zh.md create mode 100644 docs/hooks/plugin-tool-injection.md create mode 100644 docs/hooks/plugin-tool-injection.zh.md diff --git a/docs/hooks/README.zh.md b/docs/hooks/README.zh.md index 46c7c9392..2170d45c8 100644 --- a/docs/hooks/README.zh.md +++ b/docs/hooks/README.zh.md @@ -28,6 +28,69 @@ 其余 lifecycle 通过事件形式只读暴露。 +## Hook Actions + +Hook 可以返回不同的 action 来控制流程： + +| Action | 适用阶段 | 效果 | +| --- | --- | --- | +| `continue` | 所有拦截型 | 放行，不做修改 | +| `modify` | `before_llm`, `after_llm`, `before_tool`, `after_tool` | 改写请求/响应后放行 | +| `respond` | `before_tool` | 直接返回工具结果，跳过实际工具执行 | +| `deny_tool` | `before_tool` | 拒绝工具执行，返回错误信息 | +| `abort_turn` | 所有拦截型 | 中止当前 turn | +| `hard_abort` | 所有拦截型 | 强制终止整个 agent loop | + +### `respond` Action + +`respond` action 是特殊的：它允许 `before_tool` hook 直接提供工具结果，跳过实际工具执行。适用于： + +1. **插件工具注入**：外部 hook 可以实现工具，无需在 ToolRegistry 注册 +2. **工具结果缓存**：对重复调用返回缓存结果 +3. **工具模拟**：测试时返回模拟结果 + +当 hook 返回 `respond` 并携带 `HookResult` 时，agent loop 会： +1. 跳过实际工具执行 +2. 使用提供的结果作为工具执行结果 +3. 正常继续 turn 流程 + +示例（Go 进程内 hook）： + +```go +func (h *MyHook) BeforeTool( + ctx context.Context, + call *agent.ToolCallHookRequest, +) (*agent.ToolCallHookRequest, agent.HookDecision, error) { + if call.Tool == "my_plugin_tool" { + next := call.Clone() + next.HookResult = &tools.ToolResult{ + ForLLM: "Plugin tool executed successfully", + Silent: false, + IsError: false, + } + return next, agent.HookDecision{Action: agent.HookActionRespond}, nil + } + return call, agent.HookDecision{Action: agent.HookActionContinue}, nil +} +``` + +示例（Python process hook）： + +```python +def handle_before_tool(params: dict) -> dict: + tool = params.get("tool", "") + if tool == "my_plugin_tool": + return { + "action": "respond", + "result": { + "for_llm": "Plugin tool executed successfully", + "silent": False, + "is_error": False + } + } + return {"action": "continue"} +``` + ## 执行顺序 HookManager 的排序规则是： diff --git a/docs/hooks/hook-json-protocol.md b/docs/hooks/hook-json-protocol.md new file mode 100644 index 000000000..82ae28f4e --- /dev/null +++ b/docs/hooks/hook-json-protocol.md @@ -0,0 +1,568 @@ +# Hook JSON-RPC Protocol Details + +All hooks use `JSON-RPC 2.0` format, with one JSON message per line, transmitted via stdio. + +--- + +## Basic Protocol Structure + +### Request (PicoClaw → Hook) + +```json +{"jsonrpc":"2.0","id":1,"method":"hook.xxx","params":{...}} +``` + +### Response (Hook → PicoClaw) + +Success: +```json +{"jsonrpc":"2.0","id":1,"result":{...}} +``` + +Error: +```json +{"jsonrpc":"2.0","id":1,"error":{"code":-32000,"message":"error message"}} +``` + +--- + +## 1. `hook.hello` (Handshake) + +Handshake must be completed at startup, otherwise the hook process will be terminated. + +### Request + +```json +{ + "jsonrpc": "2.0", + "id": 1, + "method": "hook.hello", + "params": { + "name": "py_review_gate", + "version": 1, + "modes": ["observe", "tool", "approve"] + } +} +``` + +| Field | Description | +|-------|-------------| +| `name` | hook name (from configuration) | +| `version` | protocol version, currently `1` | +| `modes` | capability modes supported by the hook | + +### Response + +```json +{ + "jsonrpc": "2.0", + "id": 1, + "result": { + "ok": true, + "name": "python-review-gate" + } +} +``` + +--- + +## 2. `hook.before_llm` + +Triggered before sending request to LLM. Can be used to inject tools. + +### Request + +```json +{ + "jsonrpc": "2.0", + "id": 2, + "method": "hook.before_llm", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "ParentTurnID": "", + "SessionKey": "session-1", + "Iteration": 0, + "TracePath": "runTurn", + "Source": "turn.llm.request" + }, + "model": "claude-sonnet", + "messages": [ + {"role": "user", "content": "hello"} + ], + "tools": [ + { + "type": "function", + "function": { + "name": "echo", + "description": "echo text", + "parameters": {"type": "object"} + } + } + ], + "options": { + "temperature": 0.7 + }, + "channel": "cli", + "chat_id": "chat-1", + "graceful_terminal": false + } +} +``` + +| Field | Description | +|-------|-------------| +| `meta` | event metadata for tracing | +| `model` | requested model name | +| `messages` | conversation history | +| `tools` | list of available tool definitions | +| `options` | LLM parameters (temperature, max_tokens, etc.) | +| `channel` | request source channel | +| `chat_id` | session ID | + +### Response (Tool Injection Example) + +```json +{ + "jsonrpc": "2.0", + "id": 2, + "result": { + "action": "modify", + "request": { + "model": "claude-sonnet", + "messages": [{"role": "user", "content": "hello"}], + "tools": [ + { + "type": "function", + "function": { + "name": "echo", + "description": "echo", + "parameters": {} + } + }, + { + "type": "function", + "function": { + "name": "my_plugin_tool", + "description": "Plugin injected tool", + "parameters": { + "type": "object", + "properties": { + "query": {"type": "string"} + } + } + } + } + ] + } + } +} +``` + +| Field | Description | +|-------|-------------| +| `action` | decision action (see table below) | +| `request` | modified request object | + +--- + +## 3. `hook.after_llm` + +Triggered after receiving LLM response. Can modify response content. + +### Request + +```json +{ + "jsonrpc": "2.0", + "id": 3, + "method": "hook.after_llm", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "model": "claude-sonnet", + "response": { + "role": "assistant", + "content": "Hi!", + "tool_calls": [ + { + "id": "tc-1", + "type": "function", + "function": { + "name": "echo", + "arguments": "{\"text\":\"hi\"}" + } + } + ] + }, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +### Response + +```json +{ + "jsonrpc": "2.0", + "id": 3, + "result": { + "action": "continue" + } +} +``` + +--- + +## 4. `hook.before_tool` + +Triggered before tool execution. Can modify tool name and arguments, deny execution, or return result directly. + +### Request + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "method": "hook.before_tool", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "tool": "echo_text", + "arguments": { + "text": "hello" + }, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +| Field | Description | +|-------|-------------| +| `tool` | tool name | +| `arguments` | tool arguments | + +### Response (Modify Arguments) + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "result": { + "action": "modify", + "call": { + "tool": "echo_text", + "arguments": { + "text": "modified hello" + } + } + } +} +``` + +### Response (Deny Execution) + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "result": { + "action": "deny_tool", + "reason": "Invalid arguments" + } +} +``` + +### Response (Return Result Directly - respond) + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "result": { + "action": "respond", + "call": { + "tool": "my_plugin_tool", + "arguments": { + "query": "hello" + } + }, + "result": { + "for_llm": "Plugin tool executed successfully", + "for_user": "", + "silent": false, + "is_error": false + } + } +} +``` + +The `respond` action allows hooks to return tool results directly, skipping actual tool execution. Use cases: +1. **Plugin tool injection**: External hooks can implement tools without registering in ToolRegistry +2. **Tool result caching**: Return cached results for repeated calls +3. **Tool mocking**: Return mock results during testing + +| Field | Description | +|-------|-------------| +| `action` | must be `respond` | +| `call` | modified call information (optional) | +| `result` | tool result to return directly | + +--- + +## 5. `hook.after_tool` + +Triggered after tool execution completes. Can modify the result returned to LLM. + +### Request + +```json +{ + "jsonrpc": "2.0", + "id": 5, + "method": "hook.after_tool", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "tool": "echo_text", + "arguments": { + "text": "hello" + }, + "result": { + "for_llm": "echoed: hello", + "for_user": "", + "silent": false, + "is_error": false, + "async": false, + "media": [], + "artifact_tags": [], + "response_handled": false + }, + "duration": 15000000, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +| Field | Description | +|-------|-------------| +| `result.for_llm` | content returned to LLM | +| `result.for_user` | content sent to user | +| `result.silent` | whether silent (not sent to user) | +| `result.is_error` | whether it's an error | +| `result.async` | whether executed asynchronously | +| `result.media` | list of media references | +| `result.artifact_tags` | local artifact path tags | +| `result.response_handled` | whether response has been handled | +| `duration` | execution time (nanoseconds) | + +### Response + +```json +{ + "jsonrpc": "2.0", + "id": 5, + "result": { + "action": "continue" + } +} +``` + +--- + +## 6. `hook.approve_tool` + +Approval hook for deciding whether to allow execution of sensitive tools. + +### Request + +```json +{ + "jsonrpc": "2.0", + "id": 6, + "method": "hook.approve_tool", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "tool": "bash", + "arguments": { + "command": "rm -rf /" + }, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +### Response (Approved) + +```json +{ + "jsonrpc": "2.0", + "id": 6, + "result": { + "approved": true + } +} +``` + +### Response (Denied) + +```json +{ + "jsonrpc": "2.0", + "id": 6, + "result": { + "approved": false, + "reason": "Dangerous command, execution denied" + } +} +``` + +--- + +## 7. `hook.event` (notification) + +Observer event, broadcast only, no response required. `id` is `0` or absent. + +```json +{ + "jsonrpc": "2.0", + "method": "hook.event", + "params": { + "Kind": "tool_exec_start", + "Meta": { + "AgentID": "agent-1", + "TurnID": "turn-1" + }, + "Payload": { + "Tool": "echo_text", + "Arguments": {"text": "hello"} + } + } +} +``` + +Common `Kind` values: +- `turn_start` / `turn_end` +- `llm_request` / `llm_response` +- `tool_exec_start` / `tool_exec_end` / `tool_exec_skipped` +- `steering_injected` +- `interrupt_received` +- `error` + +--- + +## Action Options + +| action | Applicable hooks | Effect | +|--------|-----------------|--------| +| `continue` | All interceptor types | Pass through without modification | +| `modify` | `before_llm`, `before_tool`, `after_llm`, `after_tool` | Modify request/response and pass through | +| `respond` | `before_tool` | Return tool result directly, skip actual execution | +| `deny_tool` | `before_tool` | Deny tool execution | +| `abort_turn` | All interceptor types | Abort current turn, return error | +| `hard_abort` | All interceptor types | Force stop entire agent loop | + +--- + +## Complete Flow Example + +```json +{"jsonrpc":"2.0","id":1,"method":"hook.hello","params":{"name":"my_hook","version":1,"modes":["tool","approve"]}} +{"jsonrpc":"2.0","id":1,"result":{"ok":true,"name":"my_hook"}} +{"jsonrpc":"2.0","id":2,"method":"hook.before_llm","params":{"model":"claude-sonnet","messages":[{"role":"user","content":"hello"}],"tools":[]}} +{"jsonrpc":"2.0","id":2,"result":{"action":"continue"}} +{"jsonrpc":"2.0","id":3,"method":"hook.before_tool","params":{"tool":"bash","arguments":{"command":"ls"}}} +{"jsonrpc":"2.0","id":3,"result":{"action":"continue"}} +{"jsonrpc":"2.0","id":4,"method":"hook.approve_tool","params":{"tool":"bash","arguments":{"command":"ls"}}} +{"jsonrpc":"2.0","id":4,"result":{"approved":true}} +{"jsonrpc":"2.0","id":5,"method":"hook.after_tool","params":{"tool":"bash","arguments":{"command":"ls"},"result":{"for_llm":"file1.txt\nfile2.txt"},"duration":5000000}} +{"jsonrpc":"2.0","id":5,"result":{"action":"continue"}} +{"jsonrpc":"2.0","id":6,"method":"hook.after_llm","params":{"model":"claude-sonnet","response":{"role":"assistant","content":"Files listed"}}} +{"jsonrpc":"2.0","id":6,"result":{"action":"continue"}} +``` + +--- + +## Plugin Tool Injection via `before_llm` and `before_tool` + +Standard flow for plugin tool injection: + +1. In `before_llm`, inject tool definition to let LLM know the tool is available +2. In `before_tool`, use `respond` action to return tool execution result directly + +### `before_llm` Inject Tool Definition + +```python +def handle_before_llm(params: dict) -> dict: + tools = params.get("tools", []) + + # Add plugin tool definition + tools.append({ + "type": "function", + "function": { + "name": "my_plugin_tool", + "description": "Plugin provided tool", + "parameters": { + "type": "object", + "properties": { + "input": {"type": "string", "description": "Input content"} + }, + "required": ["input"] + } + } + }) + + return { + "action": "modify", + "request": { + "model": params["model"], + "messages": params["messages"], + "tools": tools, + "options": params.get("options", {}) + } + } +``` + +### `before_tool` Return Execution Result + +```python +def handle_before_tool(params: dict) -> dict: + tool = params.get("tool", "") + + if tool == "my_plugin_tool": + # Implement tool logic here + args = params.get("arguments", {}) + input_text = args.get("input", "") + + # Return result directly, no need to register in ToolRegistry + return { + "action": "respond", + "result": { + "for_llm": f"Plugin tool executed successfully, input: {input_text}", + "silent": False, + "is_error": False + } + } + + return {"action": "continue"} +``` + +This way, external hooks can fully implement plugin tools without registering any tool implementation inside PicoClaw. \ No newline at end of file diff --git a/docs/hooks/hook-json-protocol.zh.md b/docs/hooks/hook-json-protocol.zh.md new file mode 100644 index 000000000..675e0a429 --- /dev/null +++ b/docs/hooks/hook-json-protocol.zh.md @@ -0,0 +1,568 @@ +# Hook JSON-RPC 协议详解 + +所有 hook 使用 `JSON-RPC 2.0` 格式，每行一个 JSON 消息，通过 stdio 传输。 + +--- + +## 基础协议结构 + +### 请求（PicoClaw → Hook） + +```json +{"jsonrpc":"2.0","id":1,"method":"hook.xxx","params":{...}} +``` + +### 响应（Hook → PicoClaw） + +成功： +```json +{"jsonrpc":"2.0","id":1,"result":{...}} +``` + +错误： +```json +{"jsonrpc":"2.0","id":1,"error":{"code":-32000,"message":"错误信息"}} +``` + +--- + +## 1. `hook.hello`（握手） + +启动时必须完成握手，否则 hook 进程会被终止。 + +### 请求 + +```json +{ + "jsonrpc": "2.0", + "id": 1, + "method": "hook.hello", + "params": { + "name": "py_review_gate", + "version": 1, + "modes": ["observe", "tool", "approve"] + } +} +``` + +| 字段 | 说明 | +|------|------| +| `name` | hook 名称（来自配置） | +| `version` | 协议版本，当前为 `1` | +| `modes` | hook 支持的能力模式 | + +### 响应 + +```json +{ + "jsonrpc": "2.0", + "id": 1, + "result": { + "ok": true, + "name": "python-review-gate" + } +} +``` + +--- + +## 2. `hook.before_llm` + +在发送请求给 LLM 之前触发。可用于注入工具。 + +### 请求 + +```json +{ + "jsonrpc": "2.0", + "id": 2, + "method": "hook.before_llm", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "ParentTurnID": "", + "SessionKey": "session-1", + "Iteration": 0, + "TracePath": "runTurn", + "Source": "turn.llm.request" + }, + "model": "claude-sonnet", + "messages": [ + {"role": "user", "content": "hello"} + ], + "tools": [ + { + "type": "function", + "function": { + "name": "echo", + "description": "echo text", + "parameters": {"type": "object"} + } + } + ], + "options": { + "temperature": 0.7 + }, + "channel": "cli", + "chat_id": "chat-1", + "graceful_terminal": false + } +} +``` + +| 字段 | 说明 | +|------|------| +| `meta` | 事件元数据，用于追踪 | +| `model` | 请求的模型名称 | +| `messages` | 对话历史 | +| `tools` | 可用工具定义列表 | +| `options` | LLM 参数（temperature、max_tokens 等） | +| `channel` | 请求来源通道 | +| `chat_id` | 会话 ID | + +### 响应（注入工具示例） + +```json +{ + "jsonrpc": "2.0", + "id": 2, + "result": { + "action": "modify", + "request": { + "model": "claude-sonnet", + "messages": [{"role": "user", "content": "hello"}], + "tools": [ + { + "type": "function", + "function": { + "name": "echo", + "description": "echo", + "parameters": {} + } + }, + { + "type": "function", + "function": { + "name": "my_plugin_tool", + "description": "插件注入的工具", + "parameters": { + "type": "object", + "properties": { + "query": {"type": "string"} + } + } + } + } + ] + } + } +} +``` + +| 字段 | 说明 | +|------|------| +| `action` | 决策动作（见下表） | +| `request` | 修改后的请求对象 | + +--- + +## 3. `hook.after_llm` + +在收到 LLM 响应后触发。可修改响应内容。 + +### 请求 + +```json +{ + "jsonrpc": "2.0", + "id": 3, + "method": "hook.after_llm", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "model": "claude-sonnet", + "response": { + "role": "assistant", + "content": "Hi!", + "tool_calls": [ + { + "id": "tc-1", + "type": "function", + "function": { + "name": "echo", + "arguments": "{\"text\":\"hi\"}" + } + } + ] + }, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +### 响应 + +```json +{ + "jsonrpc": "2.0", + "id": 3, + "result": { + "action": "continue" + } +} +``` + +--- + +## 4. `hook.before_tool` + +在执行工具前触发。可修改工具名称和参数，或拒绝执行，或直接返回结果。 + +### 请求 + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "method": "hook.before_tool", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "tool": "echo_text", + "arguments": { + "text": "hello" + }, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +| 字段 | 说明 | +|------|------| +| `tool` | 工具名称 | +| `arguments` | 工具参数 | + +### 响应（改写参数） + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "result": { + "action": "modify", + "call": { + "tool": "echo_text", + "arguments": { + "text": "modified hello" + } + } + } +} +``` + +### 响应（拒绝执行） + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "result": { + "action": "deny_tool", + "reason": "参数不合法" + } +} +``` + +### 响应（直接返回结果 - respond） + +```json +{ + "jsonrpc": "2.0", + "id": 4, + "result": { + "action": "respond", + "call": { + "tool": "my_plugin_tool", + "arguments": { + "query": "hello" + } + }, + "result": { + "for_llm": "Plugin tool executed successfully", + "for_user": "", + "silent": false, + "is_error": false + } + } +} +``` + +`respond` action 允许 hook 直接返回工具结果，跳过实际工具执行。适用于： +1. **插件工具注入**：外部 hook 可实现工具，无需在 ToolRegistry 注册 +2. **工具结果缓存**：对重复调用返回缓存结果 +3. **工具模拟**：测试时返回模拟结果 + +| 字段 | 说明 | +|------|------| +| `action` | 必须为 `respond` | +| `call` | 修改后的调用信息（可选） | +| `result` | 直接返回的工具结果 | + +--- + +## 5. `hook.after_tool` + +在工具执行完成后触发。可修改返回给 LLM 的结果。 + +### 请求 + +```json +{ + "jsonrpc": "2.0", + "id": 5, + "method": "hook.after_tool", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "tool": "echo_text", + "arguments": { + "text": "hello" + }, + "result": { + "for_llm": "echoed: hello", + "for_user": "", + "silent": false, + "is_error": false, + "async": false, + "media": [], + "artifact_tags": [], + "response_handled": false + }, + "duration": 15000000, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +| 字段 | 说明 | +|------|------| +| `result.for_llm` | 返回给 LLM 的内容 | +| `result.for_user` | 发送给用户的内容 | +| `result.silent` | 是否静默（不发送给用户） | +| `result.is_error` | 是否为错误 | +| `result.async` | 是否异步执行 | +| `result.media` | 媒体引用列表 | +| `result.artifact_tags` | 本地产物路径标签 | +| `result.response_handled` | 是否已处理响应 | +| `duration` | 执行耗时（纳秒） | + +### 响应 + +```json +{ + "jsonrpc": "2.0", + "id": 5, + "result": { + "action": "continue" + } +} +``` + +--- + +## 6. `hook.approve_tool` + +审批型 hook，用于决定是否允许执行敏感工具。 + +### 请求 + +```json +{ + "jsonrpc": "2.0", + "id": 6, + "method": "hook.approve_tool", + "params": { + "meta": { + "AgentID": "agent-1", + "TurnID": "turn-1", + "SessionKey": "session-1" + }, + "tool": "bash", + "arguments": { + "command": "rm -rf /" + }, + "channel": "cli", + "chat_id": "chat-1" + } +} +``` + +### 响应（批准） + +```json +{ + "jsonrpc": "2.0", + "id": 6, + "result": { + "approved": true + } +} +``` + +### 响应（拒绝） + +```json +{ + "jsonrpc": "2.0", + "id": 6, + "result": { + "approved": false, + "reason": "危险命令，禁止执行" + } +} +``` + +--- + +## 7. `hook.event`（notification） + +观察型事件，仅广播，无需响应。`id` 为 `0` 或不存在。 + +```json +{ + "jsonrpc": "2.0", + "method": "hook.event", + "params": { + "Kind": "tool_exec_start", + "Meta": { + "AgentID": "agent-1", + "TurnID": "turn-1" + }, + "Payload": { + "Tool": "echo_text", + "Arguments": {"text": "hello"} + } + } +} +``` + +常见 `Kind` 值： +- `turn_start` / `turn_end` +- `llm_request` / `llm_response` +- `tool_exec_start` / `tool_exec_end` / `tool_exec_skipped` +- `steering_injected` +- `interrupt_received` +- `error` + +--- + +## action 可选值 + +| action | 适用 hook | 效果 | +|--------|----------|------| +| `continue` | 所有拦截型 | 放行，不做修改 | +| `modify` | `before_llm`, `before_tool`, `after_llm`, `after_tool` | 改写请求/响应后放行 | +| `respond` | `before_tool` | 直接返回工具结果，跳过实际执行 | +| `deny_tool` | `before_tool` | 拒绝执行该工具 | +| `abort_turn` | 所有拦截型 | 中止当前 turn，返回错误 | +| `hard_abort` | 所有拦截型 | 强制终止整个 agent loop | + +--- + +## 完整流程示例 + +```json +{"jsonrpc":"2.0","id":1,"method":"hook.hello","params":{"name":"my_hook","version":1,"modes":["tool","approve"]}} +{"jsonrpc":"2.0","id":1,"result":{"ok":true,"name":"my_hook"}} +{"jsonrpc":"2.0","id":2,"method":"hook.before_llm","params":{"model":"claude-sonnet","messages":[{"role":"user","content":"hello"}],"tools":[]}} +{"jsonrpc":"2.0","id":2,"result":{"action":"continue"}} +{"jsonrpc":"2.0","id":3,"method":"hook.before_tool","params":{"tool":"bash","arguments":{"command":"ls"}}} +{"jsonrpc":"2.0","id":3,"result":{"action":"continue"}} +{"jsonrpc":"2.0","id":4,"method":"hook.approve_tool","params":{"tool":"bash","arguments":{"command":"ls"}}} +{"jsonrpc":"2.0","id":4,"result":{"approved":true}} +{"jsonrpc":"2.0","id":5,"method":"hook.after_tool","params":{"tool":"bash","arguments":{"command":"ls"},"result":{"for_llm":"file1.txt\nfile2.txt"},"duration":5000000}} +{"jsonrpc":"2.0","id":5,"result":{"action":"continue"}} +{"jsonrpc":"2.0","id":6,"method":"hook.after_llm","params":{"model":"claude-sonnet","response":{"role":"assistant","content":"已列出文件"}}} +{"jsonrpc":"2.0","id":6,"result":{"action":"continue"}} +``` + +--- + +## 通过 `before_llm` 和 `before_tool` 实现插件工具注入 + +插件工具注入的标准流程： + +1. 在 `before_llm` 中注入工具定义，让 LLM 知道有这个工具可用 +2. 在 `before_tool` 中使用 `respond` action 直接返回工具执行结果 + +### `before_llm` 注入工具定义 + +```python +def handle_before_llm(params: dict) -> dict: + tools = params.get("tools", []) + + # 添加插件工具定义 + tools.append({ + "type": "function", + "function": { + "name": "my_plugin_tool", + "description": "插件提供的工具", + "parameters": { + "type": "object", + "properties": { + "input": {"type": "string", "description": "输入内容"} + }, + "required": ["input"] + } + } + }) + + return { + "action": "modify", + "request": { + "model": params["model"], + "messages": params["messages"], + "tools": tools, + "options": params.get("options", {}) + } + } +``` + +### `before_tool` 返回执行结果 + +```python +def handle_before_tool(params: dict) -> dict: + tool = params.get("tool", "") + + if tool == "my_plugin_tool": + # 在这里实现工具逻辑 + args = params.get("arguments", {}) + input_text = args.get("input", "") + + # 直接返回结果，无需在 ToolRegistry 注册 + return { + "action": "respond", + "result": { + "for_llm": f"插件工具执行成功，输入: {input_text}", + "silent": False, + "is_error": False + } + } + + return {"action": "continue"} +``` + +通过这种方式，外部 hook 可以完全实现插件工具，无需在 PicoClaw 内部注册任何工具实现。 \ No newline at end of file diff --git a/docs/hooks/plugin-tool-injection.md b/docs/hooks/plugin-tool-injection.md new file mode 100644 index 000000000..6e0f78529 --- /dev/null +++ b/docs/hooks/plugin-tool-injection.md @@ -0,0 +1,467 @@ +# Plugin Tool Injection Example + +This document demonstrates how to use PicoClaw's hook system to implement external plugin tool injection, allowing LLM to call tools implemented by external hook processes. + +--- + +## Core Principle + +Through the hook system's `respond` action, external hooks can: + +1. Inject tool **definitions** in `before_llm`, letting LLM know the tool is available +2. Return tool **execution results** directly in `before_tool` using `respond` action, skipping ToolRegistry + +This way, external hooks can fully implement plugin tools without registering any tools inside PicoClaw. + +--- + +## Complete Example: Weather Query Plugin + +Below is a complete Python hook example implementing a weather query plugin tool. + +### 1. Hook Script Implementation + +Save as `/tmp/weather_plugin.py`: + +```python +#!/usr/bin/env python3 +"""Weather query plugin hook example""" +from __future__ import annotations + +import json +import sys +import signal +from typing import Any + +# Simulated weather data +WEATHER_DATA = { + "Beijing": {"temp": 15, "weather": "Sunny", "humidity": 45}, + "Shanghai": {"temp": 18, "weather": "Cloudy", "humidity": 60}, + "Guangzhou": {"temp": 25, "weather": "Sunny", "humidity": 70}, + "Shenzhen": {"temp": 26, "weather": "Cloudy", "humidity": 75}, +} + + +def get_weather(city: str) -> dict: + """Get weather data (simulated)""" + data = WEATHER_DATA.get(city) + if data: + return { + "for_llm": f"{city} weather: {data['weather']}, temperature {data['temp']}°C, humidity {data['humidity']}%", + "for_user": "", + "silent": False, + "is_error": False, + } + return { + "for_llm": f"Weather data not found for city {city}", + "for_user": "", + "silent": False, + "is_error": True, + } + + +def handle_hello(params: dict) -> dict: + return {"ok": True, "name": "weather-plugin"} + + +def handle_before_llm(params: dict) -> dict: + """Inject weather query tool definition""" + tools = params.get("tools", []) + + # Add weather query tool + tools.append({ + "type": "function", + "function": { + "name": "get_weather", + "description": "Query weather information for a specified city", + "parameters": { + "type": "object", + "properties": { + "city": { + "type": "string", + "description": "City name, e.g.: Beijing, Shanghai, Guangzhou" + } + }, + "required": ["city"] + } + } + }) + + return { + "action": "modify", + "request": { + "model": params.get("model"), + "messages": params.get("messages", []), + "tools": tools, + "options": params.get("options", {}), + } + } + + +def handle_before_tool(params: dict) -> dict: + """Handle tool call, return result directly""" + tool = params.get("tool", "") + args = params.get("arguments", {}) + + if tool == "get_weather": + city = args.get("city", "") + result = get_weather(city) + + # Use respond action to return result directly, skip ToolRegistry + return { + "action": "respond", + "result": result, + } + + # Other tools continue normal flow + return {"action": "continue"} + + +def handle_request(method: str, params: dict) -> dict: + if method == "hook.hello": + return handle_hello(params) + if method == "hook.before_llm": + return handle_before_llm(params) + if method == "hook.before_tool": + return handle_before_tool(params) + if method == "hook.after_llm": + return {"action": "continue"} + if method == "hook.after_tool": + return {"action": "continue"} + if method == "hook.approve_tool": + return {"approved": True} + raise KeyError(f"method not found: {method}") + + +def send_response(message_id: int, result: Any | None = None, error: str | None = None) -> None: + payload: dict[str, Any] = { + "jsonrpc": "2.0", + "id": message_id, + } + if error is not None: + payload["error"] = {"code": -32000, "message": error} + else: + payload["result"] = result if result is not None else {} + + sys.stdout.write(json.dumps(payload, ensure_ascii=True) + "\n") + sys.stdout.flush() + + +def main() -> int: + for raw_line in sys.stdin: + line = raw_line.strip() + if not line: + continue + + try: + message = json.loads(line) + except json.JSONDecodeError: + continue + + method = message.get("method") + message_id = message.get("id", 0) + params = message.get("params") or {} + + if not message_id: + continue + + try: + result = handle_request(str(method or ""), params) + send_response(int(message_id), result=result) + except KeyError as exc: + send_response(int(message_id), error=str(exc)) + except Exception as exc: + send_response(int(message_id), error=f"unexpected error: {exc}") + + return 0 + + +if __name__ == "__main__": + signal.signal(signal.SIGINT, lambda *_: raise SystemExit(0)) + signal.signal(signal.SIGTERM, lambda *_: raise SystemExit(0)) + raise SystemExit(main()) +``` + +### 2. Configure PicoClaw + +Add hook configuration in the config file: + +```json +{ + "hooks": { + "enabled": true, + "processes": { + "weather_plugin": { + "enabled": true, + "priority": 100, + "transport": "stdio", + "command": ["python3", "/tmp/weather_plugin.py"], + "intercept": ["before_llm", "before_tool"] + } + } + } +} +``` + +### 3. Test Results + +When user asks "What's the weather in Beijing today?": + +1. PicoClaw sends `hook.before_llm`, hook injects `get_weather` tool definition +2. LLM sees tool definition, decides to call `get_weather(city="Beijing")` +3. PicoClaw sends `hook.before_tool`, hook uses `respond` action to return weather data +4. LLM receives result, replies to user "Beijing is sunny today, temperature 15°C" + +--- + +## Flow Diagram + +``` +User: "What's the weather in Beijing today?" + ↓ + PicoClaw + ↓ + hook.before_llm + ↓ (inject get_weather tool definition) + LLM request + ↓ + LLM decides to call get_weather(city="Beijing") + ↓ + hook.before_tool + ↓ (respond action returns weather data) + Return result directly to LLM + ↓ (skip ToolRegistry) + LLM replies: "Beijing is sunny today, temperature 15°C" +``` + +--- + +## Key Points + +### `before_llm` Inject Tool Definition + +Tool definition follows OpenAI function calling format: + +```json +{ + "type": "function", + "function": { + "name": "tool_name", + "description": "tool description", + "parameters": { + "type": "object", + "properties": { + "param_name": { + "type": "string", + "description": "parameter description" + } + }, + "required": ["list of required parameters"] + } + } +} +``` + +### `before_tool` Use respond Action + +`respond` action response format: + +```json +{ + "action": "respond", + "result": { + "for_llm": "Content returned to LLM", + "for_user": "Optional, content sent to user", + "silent": false, + "is_error": false + } +} +``` + +| Field | Description | +|-------|-------------| +| `for_llm` | Required, LLM will see this content | +| `for_user` | Optional, sent directly to user | +| `silent` | When true, not sent to user | +| `is_error` | When true, indicates execution failure | + +--- + +## Multi-Tool Injection Example + +Multiple tools can be injected simultaneously: + +```python +def handle_before_llm(params: dict) -> dict: + tools = params.get("tools", []) + + # Tool 1: Weather query + tools.append({ + "type": "function", + "function": { + "name": "get_weather", + "description": "Query city weather", + "parameters": { + "type": "object", + "properties": { + "city": {"type": "string", "description": "City name"} + }, + "required": ["city"] + } + } + }) + + # Tool 2: Calculator + tools.append({ + "type": "function", + "function": { + "name": "calculate", + "description": "Perform mathematical calculations", + "parameters": { + "type": "object", + "properties": { + "expression": {"type": "string", "description": "Mathematical expression"} + }, + "required": ["expression"] + } + } + }) + + return { + "action": "modify", + "request": { + "model": params.get("model"), + "messages": params.get("messages", []), + "tools": tools, + "options": params.get("options", {}), + } + } + + +def handle_before_tool(params: dict) -> dict: + tool = params.get("tool", "") + args = params.get("arguments", {}) + + if tool == "get_weather": + return { + "action": "respond", + "result": get_weather(args.get("city", "")), + } + + if tool == "calculate": + # Simple calculation example + try: + expr = args.get("expression", "") + result = eval(expr) # Note: needs security handling in actual use + return { + "action": "respond", + "result": { + "for_llm": f"Calculation result: {result}", + "silent": False, + "is_error": False, + }, + } + except Exception as e: + return { + "action": "respond", + "result": { + "for_llm": f"Calculation error: {e}", + "silent": False, + "is_error": True, + }, + } + + return {"action": "continue"} +``` + +--- + +## Coexistence with Built-in Tools + +Injected plugin tools coexist with PicoClaw built-in tools: + +- Built-in tools (like `bash`, `read_file`) execute normally through ToolRegistry +- Plugin tools return results through hook's `respond` action +- `handle_before_tool` only handles plugin tools, other tools return `continue` + +--- + +## Go In-Process Hook Example + +If you need to implement plugin tool injection in Go code: + +```go +package myhooks + +import ( + "context" + "github.com/sipeed/picoclaw/pkg/agent" + "github.com/sipeed/picoclaw/pkg/tools" +) + +type WeatherPluginHook struct{} + +func (h *WeatherPluginHook) BeforeLLM( + ctx context.Context, + req *agent.LLMHookRequest, +) (*agent.LLMHookRequest, agent.HookDecision, error) { + // Inject tool definition + req.Tools = append(req.Tools, agent.ToolDefinition{ + Type: "function", + Function: agent.FunctionDefinition{ + Name: "get_weather", + Description: "Query city weather", + Parameters: map[string]any{ + "type": "object", + "properties": map[string]any{ + "city": map[string]any{ + "type": "string", + "description": "City name", + }, + }, + "required": []string{"city"}, + }, + }, + }) + + return req, agent.HookDecision{Action: agent.HookActionContinue}, nil +} + +func (h *WeatherPluginHook) BeforeTool( + ctx context.Context, + call *agent.ToolCallHookRequest, +) (*agent.ToolCallHookRequest, agent.HookDecision, error) { + if call.Tool == "get_weather" { + city := call.Arguments["city"].(string) + + // Set HookResult, use respond action + next := call.Clone() + next.HookResult = &tools.ToolResult{ + ForLLM: getWeatherData(city), + Silent: false, + IsError: false, + } + + return next, agent.HookDecision{Action: agent.HookActionRespond}, nil + } + + return call, agent.HookDecision{Action: agent.HookActionContinue}, nil +} + +func getWeatherData(city string) string { + // Implement weather query logic + return fmt.Sprintf("%s weather: Sunny, temperature 20°C", city) +} +``` + +--- + +## Summary + +Through the hook system's `respond` action, external processes can: + +1. **Inject tool definitions**: Let LLM know new tools are available +2. **Provide tool implementation**: Return execution results directly, no need to register in ToolRegistry +3. **Coexist with built-in tools**: Does not affect normal operation of PicoClaw's original tools + +This provides a flexible and elegant solution for plugin development. \ No newline at end of file diff --git a/docs/hooks/plugin-tool-injection.zh.md b/docs/hooks/plugin-tool-injection.zh.md new file mode 100644 index 000000000..3ecc32322 --- /dev/null +++ b/docs/hooks/plugin-tool-injection.zh.md @@ -0,0 +1,467 @@ +# 插件工具注入示例 + +本文档展示如何利用 PicoClaw 的 hook 系统实现外部插件工具注入，让 LLM 能调用由外部 hook 进程实现的工具。 + +--- + +## 核心原理 + +通过 hook 系统的 `respond` action，外部 hook 可以： + +1. 在 `before_llm` 中注入工具**定义**，让 LLM 知道有这个工具可用 +2. 在 `before_tool` 中使用 `respond` action 直接返回工具**执行结果**，跳过 ToolRegistry + +这样，外部 hook 可以完全实现插件工具，无需在 PicoClaw 内部注册任何工具。 + +--- + +## 完整示例：天气查询插件 + +下面是一个完整的 Python hook 示例，实现一个天气查询插件工具。 + +### 1. Hook 脚本实现 + +保存为 `/tmp/weather_plugin.py`： + +```python +#!/usr/bin/env python3 +"""天气查询插件 hook 示例""" +from __future__ import annotations + +import json +import sys +import signal +from typing import Any + +# 模拟天气数据 +WEATHER_DATA = { + "北京": {"temp": 15, "weather": "晴", "humidity": 45}, + "上海": {"temp": 18, "weather": "多云", "humidity": 60}, + "广州": {"temp": 25, "weather": "晴", "humidity": 70}, + "深圳": {"temp": 26, "weather": "多云", "humidity": 75}, +} + + +def get_weather(city: str) -> dict: + """获取天气数据（模拟）""" + data = WEATHER_DATA.get(city) + if data: + return { + "for_llm": f"{city}天气：{data['weather']}，温度{data['temp']}°C，湿度{data['humidity']}%", + "for_user": "", + "silent": False, + "is_error": False, + } + return { + "for_llm": f"未找到城市 {city} 的天气数据", + "for_user": "", + "silent": False, + "is_error": True, + } + + +def handle_hello(params: dict) -> dict: + return {"ok": True, "name": "weather-plugin"} + + +def handle_before_llm(params: dict) -> dict: + """注入天气查询工具定义""" + tools = params.get("tools", []) + + # 添加天气查询工具 + tools.append({ + "type": "function", + "function": { + "name": "get_weather", + "description": "查询指定城市的天气信息", + "parameters": { + "type": "object", + "properties": { + "city": { + "type": "string", + "description": "城市名称，如：北京、上海、广州" + } + }, + "required": ["city"] + } + } + }) + + return { + "action": "modify", + "request": { + "model": params.get("model"), + "messages": params.get("messages", []), + "tools": tools, + "options": params.get("options", {}), + } + } + + +def handle_before_tool(params: dict) -> dict: + """处理工具调用，直接返回结果""" + tool = params.get("tool", "") + args = params.get("arguments", {}) + + if tool == "get_weather": + city = args.get("city", "") + result = get_weather(city) + + # 使用 respond action 直接返回结果，跳过 ToolRegistry + return { + "action": "respond", + "result": result, + } + + # 其他工具继续正常流程 + return {"action": "continue"} + + +def handle_request(method: str, params: dict) -> dict: + if method == "hook.hello": + return handle_hello(params) + if method == "hook.before_llm": + return handle_before_llm(params) + if method == "hook.before_tool": + return handle_before_tool(params) + if method == "hook.after_llm": + return {"action": "continue"} + if method == "hook.after_tool": + return {"action": "continue"} + if method == "hook.approve_tool": + return {"approved": True} + raise KeyError(f"method not found: {method}") + + +def send_response(message_id: int, result: Any | None = None, error: str | None = None) -> None: + payload: dict[str, Any] = { + "jsonrpc": "2.0", + "id": message_id, + } + if error is not None: + payload["error"] = {"code": -32000, "message": error} + else: + payload["result"] = result if result is not None else {} + + sys.stdout.write(json.dumps(payload, ensure_ascii=True) + "\n") + sys.stdout.flush() + + +def main() -> int: + for raw_line in sys.stdin: + line = raw_line.strip() + if not line: + continue + + try: + message = json.loads(line) + except json.JSONDecodeError: + continue + + method = message.get("method") + message_id = message.get("id", 0) + params = message.get("params") or {} + + if not message_id: + continue + + try: + result = handle_request(str(method or ""), params) + send_response(int(message_id), result=result) + except KeyError as exc: + send_response(int(message_id), error=str(exc)) + except Exception as exc: + send_response(int(message_id), error=f"unexpected error: {exc}") + + return 0 + + +if __name__ == "__main__": + signal.signal(signal.SIGINT, lambda *_: raise SystemExit(0)) + signal.signal(signal.SIGTERM, lambda *_: raise SystemExit(0)) + raise SystemExit(main()) +``` + +### 2. 配置 PicoClaw + +在配置文件中添加 hook 配置： + +```json +{ + "hooks": { + "enabled": true, + "processes": { + "weather_plugin": { + "enabled": true, + "priority": 100, + "transport": "stdio", + "command": ["python3", "/tmp/weather_plugin.py"], + "intercept": ["before_llm", "before_tool"] + } + } + } +} +``` + +### 3. 测试效果 + +当用户问"北京今天天气怎么样？"时： + +1. PicoClaw 发送 `hook.before_llm`，hook 注入 `get_weather` 工具定义 +2. LLM 看到工具定义，决定调用 `get_weather(city="北京")` +3. PicoClaw 发送 `hook.before_tool`，hook 使用 `respond` action 返回天气数据 +4. LLM 收到结果，回复用户"北京今天晴天，温度15°C" + +--- + +## 流程图解 + +``` +用户: "北京今天天气怎么样？" + ↓ + PicoClaw + ↓ + hook.before_llm + ↓ (注入 get_weather 工具定义) + LLM 请求 + ↓ + LLM 决定调用 get_weather(city="北京") + ↓ + hook.before_tool + ↓ (respond action 返回天气数据) + 直接返回结果给 LLM + ↓ (跳过 ToolRegistry) + LLM 回复: "北京今天晴天，温度15°C" +``` + +--- + +## 关键点说明 + +### `before_llm` 注入工具定义 + +工具定义遵循 OpenAI function calling 格式： + +```json +{ + "type": "function", + "function": { + "name": "工具名称", + "description": "工具描述", + "parameters": { + "type": "object", + "properties": { + "参数名": { + "type": "string", + "description": "参数描述" + } + }, + "required": ["必需参数列表"] + } + } +} +``` + +### `before_tool` 使用 respond action + +`respond` action 的响应格式： + +```json +{ + "action": "respond", + "result": { + "for_llm": "返回给 LLM 的内容", + "for_user": "可选，发送给用户的内容", + "silent": false, + "is_error": false + } +} +``` + +| 字段 | 说明 | +|------|------| +| `for_llm` | 必须，LLM 会看到这个内容 | +| `for_user` | 可选，直接发送给用户 | +| `silent` | 为 true 时不发送给用户 | +| `is_error` | 为 true 时表示执行失败 | + +--- + +## 多工具注入示例 + +可以同时注入多个工具： + +```python +def handle_before_llm(params: dict) -> dict: + tools = params.get("tools", []) + + # 工具1：天气查询 + tools.append({ + "type": "function", + "function": { + "name": "get_weather", + "description": "查询城市天气", + "parameters": { + "type": "object", + "properties": { + "city": {"type": "string", "description": "城市名称"} + }, + "required": ["city"] + } + } + }) + + # 工具2：计算器 + tools.append({ + "type": "function", + "function": { + "name": "calculate", + "description": "执行数学计算", + "parameters": { + "type": "object", + "properties": { + "expression": {"type": "string", "description": "数学表达式"} + }, + "required": ["expression"] + } + } + }) + + return { + "action": "modify", + "request": { + "model": params.get("model"), + "messages": params.get("messages", []), + "tools": tools, + "options": params.get("options", {}), + } + } + + +def handle_before_tool(params: dict) -> dict: + tool = params.get("tool", "") + args = params.get("arguments", {}) + + if tool == "get_weather": + return { + "action": "respond", + "result": get_weather(args.get("city", "")), + } + + if tool == "calculate": + # 简单计算示例 + try: + expr = args.get("expression", "") + result = eval(expr) # 注意：实际使用时需要安全处理 + return { + "action": "respond", + "result": { + "for_llm": f"计算结果: {result}", + "silent": False, + "is_error": False, + }, + } + except Exception as e: + return { + "action": "respond", + "result": { + "for_llm": f"计算错误: {e}", + "silent": False, + "is_error": True, + }, + } + + return {"action": "continue"} +``` + +--- + +## 与内置工具共存 + +注入的插件工具与 PicoClaw 内置工具共存： + +- 内置工具（如 `bash`、`read_file`）正常通过 ToolRegistry 执行 +- 插件工具通过 hook 的 `respond` action 返回结果 +- `handle_before_tool` 中只处理插件工具，其他工具返回 `continue` + +--- + +## Go 进程内 Hook 示例 + +如果需要在 Go 代码中实现插件工具注入： + +```go +package myhooks + +import ( + "context" + "github.com/sipeed/picoclaw/pkg/agent" + "github.com/sipeed/picoclaw/pkg/tools" +) + +type WeatherPluginHook struct{} + +func (h *WeatherPluginHook) BeforeLLM( + ctx context.Context, + req *agent.LLMHookRequest, +) (*agent.LLMHookRequest, agent.HookDecision, error) { + // 注入工具定义 + req.Tools = append(req.Tools, agent.ToolDefinition{ + Type: "function", + Function: agent.FunctionDefinition{ + Name: "get_weather", + Description: "查询城市天气", + Parameters: map[string]any{ + "type": "object", + "properties": map[string]any{ + "city": map[string]any{ + "type": "string", + "description": "城市名称", + }, + }, + "required": []string{"city"}, + }, + }, + }) + + return req, agent.HookDecision{Action: agent.HookActionContinue}, nil +} + +func (h *WeatherPluginHook) BeforeTool( + ctx context.Context, + call *agent.ToolCallHookRequest, +) (*agent.ToolCallHookRequest, agent.HookDecision, error) { + if call.Tool == "get_weather" { + city := call.Arguments["city"].(string) + + // 设置 HookResult，使用 respond action + next := call.Clone() + next.HookResult = &tools.ToolResult{ + ForLLM: getWeatherData(city), + Silent: false, + IsError: false, + } + + return next, agent.HookDecision{Action: agent.HookActionRespond}, nil + } + + return call, agent.HookDecision{Action: agent.HookActionContinue}, nil +} + +func getWeatherData(city string) string { + // 实现天气查询逻辑 + return fmt.Sprintf("%s天气：晴，温度20°C", city) +} +``` + +--- + +## 总结 + +通过 hook 系统的 `respond` action，外部进程可以： + +1. **注入工具定义**：让 LLM 知道有新工具可用 +2. **提供工具实现**：直接返回执行结果，无需注册到 ToolRegistry +3. **与内置工具共存**：不影响 PicoClaw 原有工具的正常运行 + +这为插件开发提供了灵活、优雅的解决方案。 \ No newline at end of file