fix(seahorse): prevent tool-call format leakage into LLM summaries

pkg/agent/agent_utils.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"maps"
 	"path/filepath"
+	"regexp"
 	"strings"
 	"time"
 
@@ -69,8 +70,17 @@ func outboundTurnMetadata(
 	return agentID, sessionKey, outboundScopeFromSessionScope(scope)
 }
 
+// stripToolUseText removes [tool_use: ...] patterns that LLMs may regurgitate
+// after seeing them in seahorse FTS5 / summary contexts.
+func stripToolUseText(content string) string {
+	// Match "[tool_use: name, args: {...}]" variants
+	re := regexp.MustCompile(`\[tool_use:\s*\w+,\s*args:\s*\{[^}]*}\]?\]?\s*`)
+	return strings.TrimSpace(re.ReplaceAllString(content, ""))
+}
+
 func outboundMessageForTurn(ts *turnState, content string) bus.OutboundMessage {
 	agentID, sessionKey, scope := outboundTurnMetadata(ts.agent.ID, ts.sessionKey, ts.opts.Dispatch.SessionScope)
+	content = stripToolUseText(content)
 	return bus.OutboundMessage{
 		Channel: ts.channel,
 		ChatID:  ts.chatID,

pkg/seahorse/short_compaction.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"sort"
+	"strings"
 	"time"
 
 	"github.com/sipeed/picoclaw/pkg/logger"
@@ -746,11 +747,16 @@ func (e *CompactionEngine) runCondensedLoop(ctx context.Context, convID int64) {
 func formatMessagesForSummary(messages []Message) string {
 	var result string
 	for _, m := range messages {
-		ts := m.CreatedAt.Format("2006-01-02 15:04 MST")
-		content := m.Content
-		if content == "" && len(m.Parts) > 0 {
-			content = partsToReadableContent(m.Parts)
+		// Skip tool-only messages: tool calls and tool results are mechanical,
+		// not conversational content. Including them (even via partsToReadableContent)
+		// causes LLMs to mimic the format in their own output, leaking mock tool-call
+		// text to users. Only user/assistant messages with actual text content belong
+		// in summaries.
+		content := strings.TrimSpace(m.Content)
+		if content == "" {
+			continue
 		}
+		ts := m.CreatedAt.Format("2006-01-02 15:04 MST")
 		result += fmt.Sprintf("[%s]\n%s\n\n", ts, content)
 	}
 	return result
@@ -849,9 +855,9 @@ Output requirements:
 func truncateSummary(messages []Message) string {
 	content := ""
 	for _, m := range messages {
-		c := m.Content
-		if c == "" && len(m.Parts) > 0 {
-			c = partsToReadableContent(m.Parts)
+		c := strings.TrimSpace(m.Content)
+		if c == "" {
+			continue // skip tool-only messages; see formatMessagesForSummary
 		}
 		content += c + "\n"
 	}

pkg/seahorse/store.go

@@ -224,9 +224,9 @@ func partsToReadableContent(parts []MessagePart) string {
 		case "text":
 			b.WriteString(p.Text)
 		case "tool_use":
-			fmt.Fprintf(&b, "[tool_use: %s, args: %s]", p.Name, p.Arguments)
+			fmt.Fprintf(&b, "🔧 %s", p.Name)
 		case "tool_result":
-			fmt.Fprintf(&b, "[tool_result for %s: %s]", p.ToolCallID, p.Text)
+			fmt.Fprintf(&b, "📋 %s", p.Text)
 		case "media":
 			fmt.Fprintf(&b, "[media: %s (%s)]", p.MediaURI, p.MimeType)
 		default: