fix: suppress emoji in voice/assistant mode and clean up system prompt

- Add no-emoji instruction to voice mode prompt for natural TTS output
- Apply voice mode prompt to both "voice" and "assistant" input modes
- Remove redundant identity header from system prompt (covered by IDENTITY.md)
- Simplify runtime info to "Termux (Android)"
- Remove emoji from IDENTITY.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pkg/agent/context.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"time"
 
@@ -76,20 +75,14 @@ func (cb *ContextBuilder) SetEnabledChannels(channels []string) {
 func (cb *ContextBuilder) getIdentity() string {
 	now := time.Now().Format("2006-01-02 15:04 (Monday)")
 	workspacePath, _ := filepath.Abs(filepath.Join(cb.workspace))
-	runtime := fmt.Sprintf("%s %s, Go %s", runtime.GOOS, runtime.GOARCH, runtime.Version())
-
 	// Build tools section dynamically
 	toolsSection := cb.buildToolsSection()
 
-	return fmt.Sprintf(`# picoclaw 🦞
-
-You are picoclaw, a helpful AI assistant.
-
-## Current Time
+	return fmt.Sprintf(`## Current Time
 %s
 
 ## Runtime
-%s
+Termux (Android)
 
 ## Workspace
 Your workspace is at: %s
@@ -107,7 +100,7 @@ Your workspace is at: %s
    - append_daily: Record today's events and memos (diary-like daily entries)
    - read_long_term: Read long-term memory
    - read_daily: Read today's daily notes`,
-		now, runtime, workspacePath, toolsSection)
+		now, workspacePath, toolsSection)
 }
 
 func (cb *ContextBuilder) buildChannelsSection() string {
@@ -228,8 +221,8 @@ func (cb *ContextBuilder) BuildMessages(history []providers.Message, summary str
 			channel, chatID, inputMode)
 	}
 
-	// Add voice mode instructions when input is from voice
-	if inputMode == "voice" {
+	// Add voice mode instructions when input is from voice or assistant
+	if inputMode == "voice" || inputMode == "assistant" {
 		systemPrompt += voiceModePrompt()
 	}
 

pkg/agent/voice_prompt.go

@@ -11,6 +11,7 @@ The user is currently speaking to you via voice input. Your response will be rea
 - Do NOT use markdown formatting (no headers, bold, code blocks, tables, bullet lists)
 - Use natural spoken language as if having a conversation
 - Spell out numbers and avoid special characters that sound awkward when spoken
+- Do NOT use emoji, emoticons, or kaomoji (e.g. 😊, (^^), ♪) — they are read aloud by TTS and sound unnatural
 - If the user explicitly asks for more detail, provide longer explanations but still in natural spoken language without markdown
 - If code, file contents, or highly technical output is needed, briefly summarize and suggest switching to text mode for the full details`
 }

workspace/IDENTITY.md

@@ -1,7 +1,7 @@
 # Identity
 
 ## Name
-PicoClaw 🦞
+PicoClaw
 
 ## Description
 Ultra-lightweight personal AI assistant written in Go, inspired by nanobot.