fix: enhance message handling by refining tool message sanitization and updating WeCom message sending method

pkg/agent/context.go

@@ -229,8 +229,19 @@ func sanitizeHistoryForProvider(history []providers.Message) []providers.Message
 				logger.DebugCF("agent", "Dropping orphaned leading tool message", map[string]any{})
 				continue
 			}
-			last := sanitized[len(sanitized)-1]
-			if last.Role != "assistant" || len(last.ToolCalls) == 0 {
+			// Walk backwards to find the nearest assistant message,
+			// skipping over any preceding tool messages (multi-tool-call case).
+			foundAssistant := false
+			for i := len(sanitized) - 1; i >= 0; i-- {
+				if sanitized[i].Role == "tool" {
+					continue
+				}
+				if sanitized[i].Role == "assistant" && len(sanitized[i].ToolCalls) > 0 {
+					foundAssistant = true
+				}
+				break
+			}
+			if !foundAssistant {
 				logger.DebugCF("agent", "Dropping orphaned tool message", map[string]any{})
 				continue
 			}

pkg/agent/loop.go

@@ -463,8 +463,7 @@ func (al *AgentLoop) runAgentLoop(ctx context.Context, agent *AgentInstance, opt
 	}
 
 	// 9. Log response
-	responsePreview := utils.Truncate(finalContent, 120)
-	logger.InfoCF("agent", fmt.Sprintf("Response: %s", responsePreview),
+	logger.InfoCF("agent", fmt.Sprintf("Response: [%s]", finalContent),
 		map[string]any{
 			"agent_id":     agent.ID,
 			"session_key":  opts.SessionKey,

pkg/channels/wecom_app.go

@@ -231,7 +231,7 @@ func (c *WeComAppChannel) Send(ctx context.Context, msg bus.OutboundMessage) err
 		"preview": utils.Truncate(msg.Content, 100),
 	})
 
-	return c.sendTextMessage(ctx, accessToken, msg.ChatID, msg.Content)
+	return c.sendMarkdownMessage(ctx, accessToken, msg.ChatID, msg.Content)
 }
 
 // handleWebhook handles incoming webhook requests from WeCom