feat: persist photos and enrich conversation history

backend/services/brains/prompt_brain.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import asyncio
 from collections.abc import Awaitable
+from time import monotonic
 from typing import Any
 from uuid import uuid4
 
@@ -503,12 +504,45 @@ class PromptBrain(BaseBrain):
                 await params.result_callback(result)
 
         async def call_tool(params: FunctionCallParams) -> None:
+            invocation_id = f"tool_{uuid4().hex[:20]}"
+            started_at = monotonic()
+            await self._emit_trace(
+                "tool_started",
+                invocationId=invocation_id,
+                toolId=tool.id,
+                toolName=tool.name,
+                functionName=tool.function_name,
+                toolType=tool.type,
+            )
             try:
                 result = await self._tools.execute(tool, dict(params.arguments or {}))
                 if result["updated_variables"]:
                     self._refresh_prompt()
+                await self._emit_trace(
+                    "tool_completed" if result.get("status") == "ok" else "tool_failed",
+                    invocationId=invocation_id,
+                    toolId=tool.id,
+                    toolName=tool.name,
+                    functionName=tool.function_name,
+                    toolType=tool.type,
+                    status=str(result.get("status") or "unknown"),
+                    durationMs=max(0, round((monotonic() - started_at) * 1000)),
+                    updatedVariables=list(result.get("updated_variables") or []),
+                    resultKeys=sorted(str(name) for name in result if name != "data"),
+                )
                 await return_result(params, result)
             except (ToolExecutionError, ValueError) as exc:
+                await self._emit_trace(
+                    "tool_failed",
+                    invocationId=invocation_id,
+                    toolId=tool.id,
+                    toolName=tool.name,
+                    functionName=tool.function_name,
+                    toolType=tool.type,
+                    status="error",
+                    durationMs=max(0, round((monotonic() - started_at) * 1000)),
+                    error=str(exc)[:2048],
+                )
                 await return_result(
                     params,
                     {"status": "error", "message": f"工具调用失败: {exc}"},
@@ -522,6 +556,26 @@ class PromptBrain(BaseBrain):
         )
         return schema, call_tool
 
+    async def _emit_trace(self, event: str, **details: Any) -> None:
+        runtime = self._runtime
+        if runtime is None:
+            return
+        try:
+            await runtime.queue_frame(
+                OutputTransportMessageUrgentFrame(
+                    message={
+                        "type": "workflow-event",
+                        "eventId": f"wfe_{uuid4().hex[:20]}",
+                        "event": event,
+                        "timestamp": time_now_iso8601(),
+                        "sessionId": runtime.session_id,
+                        **details,
+                    }
+                )
+            )
+        except Exception as exc:  # noqa: BLE001 - trace must not alter execution
+            logger.warning(f"发送 Prompt 工具轨迹失败，不影响当前调用: {exc}")
+
     def _make_end_call_tool(self, tool, runtime: BrainRuntime):
         config = (tool.definition or {}).get("config") or {}
         message_type = str(config.get("message_type") or "none")