feat: enhance agent orchestrator with runtime hardening and tool governance [AC-MARH-01~12]

ai-service/app/models/mid/tool_trace.py

@@ -43,6 +43,8 @@ class ToolCallTrace:
     - error_code: 错误码
     - args_digest: 参数摘要（脱敏）
     - result_digest: 结果摘要
+    - arguments: 完整参数
+    - result: 完整结果
     """
     tool_name: str
     duration_ms: int
@@ -53,6 +55,8 @@ class ToolCallTrace:
     error_code: str | None = None
     args_digest: str | None = None
     result_digest: str | None = None
+    arguments: dict[str, Any] | None = None
+    result: Any = None
     started_at: datetime = field(default_factory=datetime.utcnow)
     completed_at: datetime | None = None
 
@@ -74,6 +78,10 @@ class ToolCallTrace:
             result["args_digest"] = self.args_digest
         if self.result_digest:
             result["result_digest"] = self.result_digest
+        if self.arguments:
+            result["arguments"] = self.arguments
+        if self.result is not None:
+            result["result"] = self.result
         return result
 
     @staticmethod

ai-service/app/services/mid/agent_orchestrator.py

@@ -2,6 +2,10 @@
 Agent Orchestrator for Mid Platform.
 [AC-MARH-07] ReAct loop with iteration limit (3-5 iterations).
 
+Supports two execution modes:
+1. ReAct (Text-based): Traditional Thought/Action/Observation loop
+2. Function Calling: Uses LLM's native function calling capability
+
 ReAct Flow:
 1. Thought: Agent thinks about what to do
 2. Action: Agent decides to use a tool
@@ -16,6 +20,8 @@ import re
 import time
 import uuid
 from dataclasses import dataclass
+from datetime import datetime
+from enum import Enum
 from typing import Any
 
 from app.models.mid.schemas import (
@@ -26,7 +32,10 @@ from app.models.mid.schemas import (
     ToolType,
     TraceInfo,
 )
+from app.services.llm.base import ToolDefinition
+from app.services.mid.tool_guide_registry import ToolGuideRegistry, get_tool_guide_registry
 from app.services.mid.timeout_governor import TimeoutGovernor
+from app.services.mid.tool_converter import convert_tools_to_llm_format, build_tool_result_message
 from app.services.prompt.template_service import PromptTemplateService
 from app.services.prompt.variable_resolver import VariableResolver
 
@@ -36,11 +45,17 @@ DEFAULT_MAX_ITERATIONS = 5
 MIN_ITERATIONS = 3
 
 
+class AgentMode(str, Enum):
+    """Agent execution mode."""
+    REACT = "react"
+    FUNCTION_CALLING = "function_calling"
+
+
 @dataclass
 class ToolResult:
     """Tool execution result."""
     success: bool
-    output: str | None = None
+    output: Any = None
     error: str | None = None
     duration_ms: int = 0
 
@@ -59,6 +74,7 @@ class AgentOrchestrator:
 
     Features:
     - ReAct loop with max 5 iterations (min 3)
+    - Function Calling mode for supported LLMs (OpenAI, DeepSeek, etc.)
     - Per-tool timeout (2s) and end-to-end timeout (8s)
     - Automatic fallback on iteration limit or timeout
     - Template-based prompt with variable injection
@@ -70,17 +86,74 @@ class AgentOrchestrator:
         timeout_governor: TimeoutGovernor | None = None,
         llm_client: Any = None,
         tool_registry: Any = None,
+        guide_registry: ToolGuideRegistry | None = None,
         template_service: PromptTemplateService | None = None,
         variable_resolver: VariableResolver | None = None,
         tenant_id: str | None = None,
+        user_id: str | None = None,
+        session_id: str | None = None,
+        scene: str | None = None,
+        mode: AgentMode = AgentMode.FUNCTION_CALLING,
     ):
         self._max_iterations = max(min(max_iterations, 5), MIN_ITERATIONS)
         self._timeout_governor = timeout_governor or TimeoutGovernor()
         self._llm_client = llm_client
         self._tool_registry = tool_registry
+        self._guide_registry = guide_registry
         self._template_service = template_service
         self._variable_resolver = variable_resolver or VariableResolver()
         self._tenant_id = tenant_id
+        self._user_id = user_id
+        self._session_id = session_id
+        self._scene = scene
+        self._mode = mode
+        self._tools_cache: list[ToolDefinition] | None = None
+
+    def _get_tools_definition(self) -> list[ToolDefinition]:
+        """Get cached tools definition for Function Calling."""
+        if self._tools_cache is None and self._tool_registry:
+            tools = self._tool_registry.get_all_tools()
+            self._tools_cache = convert_tools_to_llm_format(tools)
+        return self._tools_cache or []
+
+    async def _get_tools_definition_async(self) -> list[ToolDefinition]:
+        """Get tools definition for Function Calling with dynamic schema support."""
+        if self._tools_cache is not None:
+            return self._tools_cache
+        
+        if not self._tool_registry:
+            return []
+        
+        tools = self._tool_registry.get_all_tools()
+        result = []
+        
+        for tool in tools:
+            if tool.name == "kb_search_dynamic" and self._tenant_id:
+                from app.services.mid.kb_search_dynamic_tool import (
+                    _TOOL_SCHEMA_CACHE,
+                    _TOOL_SCHEMA_CACHE_TTL_SECONDS,
+                )
+                import time
+                
+                cache_key = f"tool_schema:{self._tenant_id}"
+                current_time = time.time()
+                
+                if cache_key in _TOOL_SCHEMA_CACHE:
+                    cached_time, cached_schema = _TOOL_SCHEMA_CACHE[cache_key]
+                    if current_time - cached_time < _TOOL_SCHEMA_CACHE_TTL_SECONDS:
+                        result.append(ToolDefinition(
+                            name=cached_schema["name"],
+                            description=cached_schema["description"],
+                            parameters=cached_schema["parameters"],
+                        ))
+                        continue
+                
+                result.append(convert_tool_to_llm_format(tool))
+            else:
+                result.append(convert_tool_to_llm_format(tool))
+        
+        self._tools_cache = result
+        return result
 
     async def execute(
         self,
@@ -90,7 +163,7 @@ class AgentOrchestrator:
         on_action: Any = None,
     ) -> tuple[str, ReActContext, TraceInfo]:
         """
-        [AC-MARH-07] Execute ReAct loop with iteration control.
+        [AC-MARH-07] Execute agent loop with iteration control.
 
         Args:
             user_message: User input message
@@ -101,6 +174,416 @@ class AgentOrchestrator:
         Returns:
             Tuple of (final_answer, react_context, trace_info)
         """
+        if self._mode == AgentMode.FUNCTION_CALLING:
+            return await self._execute_function_calling(user_message, context, on_action)
+        else:
+            return await self._execute_react(user_message, context, on_thought, on_action)
+
+    async def _execute_function_calling(
+        self,
+        user_message: str,
+        context: dict[str, Any] | None = None,
+        on_action: Any = None,
+    ) -> tuple[str, ReActContext, TraceInfo]:
+        """
+        Execute using Function Calling mode.
+        
+        This mode uses the LLM's native function calling capability,
+        which is more reliable and token-efficient than text-based ReAct.
+        """
+        react_ctx = ReActContext(max_iterations=self._max_iterations)
+        tool_calls: list[ToolCallTrace] = []
+        start_time = time.time()
+
+        logger.info(
+            f"[AC-MARH-07] Starting Function Calling loop: max_iterations={self._max_iterations}, "
+            f"llm_client={self._llm_client is not None}, tool_registry={self._tool_registry is not None}"
+        )
+
+        if not self._llm_client:
+            logger.error("[DEBUG-ORCH] LLM client is None, returning error response")
+            return "抱歉，服务配置错误，请联系管理员。", react_ctx, TraceInfo(
+                mode=ExecutionMode.AGENT,
+                request_id=str(uuid.uuid4()),
+                generation_id=str(uuid.uuid4()),
+            )
+
+        try:
+            messages: list[dict[str, Any]] = [
+                {"role": "system", "content": await self._build_system_prompt()},
+                {"role": "user", "content": user_message},
+            ]
+            
+            tools = await self._get_tools_definition_async()
+            
+            overall_start = time.time()
+            end_to_end_timeout = self._timeout_governor.end_to_end_timeout_seconds
+            llm_timeout = getattr(self._timeout_governor, 'llm_timeout_seconds', 15.0)
+
+            while react_ctx.should_continue and react_ctx.iteration < react_ctx.max_iterations:
+                react_ctx.iteration += 1
+
+                elapsed = time.time() - overall_start
+                remaining_time = end_to_end_timeout - elapsed
+                if remaining_time <= 0:
+                    logger.warning("[AC-MARH-09] Function Calling loop exceeded end-to-end timeout")
+                    react_ctx.final_answer = "抱歉，处理超时，请稍后重试或联系人工客服。"
+                    break
+
+                logger.info(
+                    f"[AC-MARH-07] Function Calling iteration {react_ctx.iteration}/"
+                    f"{react_ctx.max_iterations}, remaining_time={remaining_time:.1f}s"
+                )
+
+                logger.info(
+                    f"[DEBUG-ORCH] Calling LLM generate with messages_count={len(messages)}, "
+                    f"tools_count={len(tools) if tools else 0}"
+                )
+
+                response = await asyncio.wait_for(
+                    self._llm_client.generate(
+                        messages=messages,
+                        tools=tools if tools else None,
+                        tool_choice="auto" if tools else None,
+                    ),
+                    timeout=min(llm_timeout, remaining_time)
+                )
+
+                logger.info(
+                    f"[DEBUG-ORCH] LLM response received: has_tool_calls={response.has_tool_calls}, "
+                    f"content_length={len(response.content) if response.content else 0}, "
+                    f"tool_calls_count={len(response.tool_calls) if response.tool_calls else 0}"
+                )
+
+                if response.has_tool_calls:
+                    for tool_call in response.tool_calls:
+                        tool_name = tool_call.name
+                        tool_args = tool_call.arguments
+                        
+                        logger.info(f"[AC-MARH-07] Tool call: {tool_name}, args={tool_args}")
+                        
+                        messages.append({
+                            "role": "assistant",
+                            "content": response.content,
+                            "tool_calls": [tool_call.to_dict()],
+                        })
+                        
+                        tool_result, tool_trace = await self._act_fc(
+                            tool_call.id, tool_name, tool_args, react_ctx
+                        )
+                        tool_calls.append(tool_trace)
+                        react_ctx.tool_calls.append(tool_trace)
+                        
+                        if on_action:
+                            await on_action(tool_name, tool_result)
+                        
+                        called_tools = {tc.tool_name for tc in react_ctx.tool_calls[:-1]}
+                        is_first_call = tool_name not in called_tools
+                        
+                        # Extract tool_guide from output if present (added by _act_fc)
+                        result_output = tool_result.output if tool_result.success else {"error": tool_result.error}
+                        tool_guide = None
+                        if isinstance(result_output, dict) and "_tool_guide" in result_output:
+                            result_output = dict(result_output)
+                            tool_guide = result_output.pop("_tool_guide")
+                        
+                        messages.append(build_tool_result_message(
+                            tool_call_id=tool_call.id,
+                            tool_name=tool_name,
+                            result=result_output,
+                            tool_guide=tool_guide,
+                        ))
+                        
+                        if not tool_result.success:
+                            if tool_trace.status == ToolCallStatus.TIMEOUT:
+                                react_ctx.final_answer = "抱歉，操作超时，请稍后重试或联系人工客服。"
+                                react_ctx.should_continue = False
+                                break
+                else:
+                    react_ctx.final_answer = response.content or "抱歉，我无法处理您的请求。"
+                    react_ctx.should_continue = False
+                    break
+
+            if react_ctx.should_continue and not react_ctx.final_answer:
+                logger.warning(f"[AC-MARH-07] Function Calling reached max iterations: {react_ctx.iteration}")
+                react_ctx.final_answer = await self._force_final_answer_fc(messages)
+
+        except asyncio.TimeoutError:
+            logger.error("[AC-MARH-09] Function Calling loop timed out (end-to-end)")
+            react_ctx.final_answer = "抱歉，处理超时，请稍后重试或联系人工客服。"
+            tool_calls.append(ToolCallTrace(
+                tool_name="fc_loop",
+                tool_type=ToolType.INTERNAL,
+                duration_ms=int((time.time() - start_time) * 1000),
+                status=ToolCallStatus.TIMEOUT,
+                error_code="E2E_TIMEOUT",
+            ))
+        except Exception as e:
+            logger.error(f"[AC-MARH-07] Function Calling error: {e}", exc_info=True)
+            react_ctx.final_answer = f"抱歉，处理过程中发生错误：{str(e)}"
+
+        total_duration_ms = int((time.time() - start_time) * 1000)
+        trace = TraceInfo(
+            mode=ExecutionMode.AGENT,
+            request_id=str(uuid.uuid4()),
+            generation_id=str(uuid.uuid4()),
+            react_iterations=react_ctx.iteration,
+            tools_used=[tc.tool_name for tc in tool_calls if tc.tool_name not in ("fc_loop", "react_loop")],
+            tool_calls=tool_calls if tool_calls else None,
+        )
+
+        logger.info(
+            f"[AC-MARH-07] Function Calling completed: iterations={react_ctx.iteration}, "
+            f"duration_ms={total_duration_ms}"
+        )
+
+        return react_ctx.final_answer or "抱歉，我暂时无法处理您的请求。", react_ctx, trace
+
+    async def _act_fc(
+        self,
+        tool_call_id: str,
+        tool_name: str,
+        tool_args: dict[str, Any],
+        react_ctx: ReActContext,
+    ) -> tuple[ToolResult, ToolCallTrace]:
+        """Execute tool in Function Calling mode."""
+        start_time = time.time()
+
+        if not self._tool_registry:
+            duration_ms = int((time.time() - start_time) * 1000)
+            return ToolResult(
+                success=False,
+                error="Tool registry not configured",
+                duration_ms=duration_ms,
+            ), ToolCallTrace(
+                tool_name=tool_name,
+                tool_type=ToolType.INTERNAL,
+                duration_ms=duration_ms,
+                status=ToolCallStatus.ERROR,
+                error_code="NO_REGISTRY",
+            )
+
+        try:
+            final_args = dict(tool_args)
+            if self._tenant_id:
+                final_args["tenant_id"] = self._tenant_id
+            if self._user_id:
+                final_args["user_id"] = self._user_id
+            if self._session_id:
+                final_args["session_id"] = self._session_id
+
+            if tool_name == "kb_search_dynamic":
+                # 确保 context 存在，供 AI 传入动态过滤条件
+                if "context" not in final_args:
+                    final_args["context"] = {}
+                # scene 参数由 AI 从元数据中选择，系统不强制覆盖
+
+            logger.info(
+                f"[AC-MARH-07] FC Tool call starting: tool={tool_name}, "
+                f"args={tool_args}, final_args={final_args}"
+            )
+
+            result = await asyncio.wait_for(
+                self._tool_registry.execute(
+                    name=tool_name,
+                    **final_args,
+                ),
+                timeout=self._timeout_governor.per_tool_timeout_seconds
+            )
+
+            duration_ms = int((time.time() - start_time) * 1000)
+            
+            called_tools = {tc.tool_name for tc in react_ctx.tool_calls}
+            is_first_call = tool_name not in called_tools
+            
+            output = result.output
+            if is_first_call and result.success:
+                usage_guide = self._build_tool_usage_guide(tool_name)
+                if usage_guide:
+                    if isinstance(output, dict):
+                        output = dict(output)
+                        output["_tool_guide"] = usage_guide
+                    elif isinstance(output, str):
+                        output = f"{output}\n\n---\n{usage_guide}"
+                    else:
+                        output = {"result": output, "_tool_guide": usage_guide}
+
+            return ToolResult(
+                success=result.success,
+                output=output,
+                error=result.error,
+                duration_ms=duration_ms,
+            ), ToolCallTrace(
+                tool_name=tool_name,
+                tool_type=ToolType.INTERNAL,
+                duration_ms=duration_ms,
+                status=ToolCallStatus.OK if result.success else ToolCallStatus.ERROR,
+                args_digest=str(tool_args)[:100] if tool_args else None,
+                result_digest=str(result.output)[:100] if result.output else None,
+                arguments=tool_args,
+                result=output,
+            )
+
+        except asyncio.TimeoutError:
+            duration_ms = int((time.time() - start_time) * 1000)
+            logger.warning(f"[AC-MARH-08] FC Tool timeout: {tool_name}, duration={duration_ms}ms")
+            return ToolResult(
+                success=False,
+                error="Tool timeout",
+                duration_ms=duration_ms,
+            ), ToolCallTrace(
+                tool_name=tool_name,
+                tool_type=ToolType.INTERNAL,
+                duration_ms=duration_ms,
+                status=ToolCallStatus.TIMEOUT,
+                error_code="TOOL_TIMEOUT",
+                arguments=tool_args,
+            )
+
+        except Exception as e:
+            duration_ms = int((time.time() - start_time) * 1000)
+            logger.error(f"[AC-MARH-07] FC Tool error: {tool_name}, error={e}")
+            return ToolResult(
+                success=False,
+                error=str(e),
+                duration_ms=duration_ms,
+            ), ToolCallTrace(
+                tool_name=tool_name,
+                tool_type=ToolType.INTERNAL,
+                duration_ms=duration_ms,
+                status=ToolCallStatus.ERROR,
+                error_code="TOOL_ERROR",
+                arguments=tool_args,
+            )
+
+    async def _build_system_prompt(self) -> str:
+        """Build system prompt for Function Calling mode with template support."""
+        default_prompt = """你是一个智能客服助手，正在处理用户请求。
+
+## 决策协议
+
+1. 优先使用已有观察信息，避免重复调用同类工具。
+2. 当问题需要外部事实或结构化状态时再调用工具；如果可直接回答则不要调用。
+3. 缺少关键参数时，优先向用户追问，不要使用空参数调用工具。
+4. 工具失败时，先说明已尝试，再给出降级方案或下一步引导。
+5. 对用户输出必须拟人、自然、有同理心，不暴露"工具调用/路由/策略"等内部术语。
+
+## 知识库查询强制流程
+
+当用户问题需要进行知识库查询（kb_search_dynamic）时，必须遵循以下步骤：
+
+**步骤1：先调用 list_document_metadata_fields**
+- 在任何知识库搜索之前，必须先调用 `list_document_metadata_fields` 工具
+- 获取可用的元数据字段（如 grade, subject, kb_scene 等）及其常见取值
+
+**步骤2：分析用户意图，选择合适的过滤条件**
+- 根据用户问题和返回的元数据字段，确定合适的过滤条件
+- 从元数据字段的 common_values 中选择合适的值
+
+**步骤3：调用 kb_search_dynamic 进行搜索**
+- 使用步骤1获取的元数据字段构造 context 参数
+- scene 参数必须从元数据字段的 kb_scene 常见值中选择，不要硬编码
+
+**示例流程：**
+1. 调用 `list_document_metadata_fields` 获取字段信息
+2. 根据返回结果，发现可用字段：grade（年级）、subject（学科）、kb_scene（场景）
+3. 分析用户问题"三年级语文怎么学"，确定过滤条件：grade="三年级", subject="语文"
+4. 从 kb_scene 的常见值中选择合适的 scene（如"学习方案"）
+5. 调用 `kb_search_dynamic`，传入构造好的 context 和 scene
+
+## 注意事项
+- **严禁**在调用 kb_search_dynamic 之前不调用 list_document_metadata_fields。
+"""
+
+        if not self._template_service or not self._tenant_id:
+            return default_prompt
+
+        try:
+            from app.core.database import get_session
+            from app.core.prompts import SYSTEM_PROMPT
+            
+            async with get_session() as session:
+                template_service = PromptTemplateService(session)
+                
+                base_prompt = await template_service.get_published_template(
+                    tenant_id=self._tenant_id,
+                    scene="agent_fc",
+                    resolver=self._variable_resolver,
+                )
+                
+                if not base_prompt or base_prompt == SYSTEM_PROMPT:
+                    base_prompt = await template_service.get_published_template(
+                        tenant_id=self._tenant_id,
+                        scene="default",
+                        resolver=self._variable_resolver,
+                    )
+                
+                if not base_prompt or base_prompt == SYSTEM_PROMPT:
+                    logger.info("[AC-MARH-07] No published template found for agent_fc or default, using default prompt")
+                    return default_prompt
+
+                agent_protocol = """
+
+## 智能体决策协议
+
+1. 优先使用已有观察信息，避免重复调用同类工具。
+2. 当问题需要外部事实或结构化状态时再调用工具；如果可直接回答则不要调用。
+3. 缺少关键参数时，优先向用户追问，不要使用空参数调用工具。
+4. 工具失败时，先说明已尝试，再给出降级方案或下一步引导。
+
+## 知识库查询强制流程
+
+当用户问题需要进行知识库查询（kb_search_dynamic）时，必须遵循以下步骤：
+
+**步骤1：先调用 list_document_metadata_fields**
+- 在任何知识库搜索之前，必须先调用 `list_document_metadata_fields` 工具
+- 获取可用的元数据字段（如 grade, subject, kb_scene 等）及其常见取值
+
+**步骤2：分析用户意图，选择合适的过滤条件**
+- 根据用户问题和返回的元数据字段，确定合适的过滤条件
+- 从元数据字段的 common_values 中选择合适的值
+
+**步骤3：调用 kb_search_dynamic 进行搜索**
+- 使用步骤1获取的元数据字段构造 context 参数
+- scene 参数必须从元数据字段的 kb_scene 常见值中选择，不要硬编码
+
+## 注意事项
+- **严禁**在调用 kb_search_dynamic 之前不调用 list_document_metadata_fields。
+"""
+                
+                final_prompt = base_prompt + agent_protocol
+                
+                logger.info(f"[AC-MARH-07] Loaded template for tenant={self._tenant_id}")
+                return final_prompt
+
+        except Exception as e:
+            logger.warning(f"[AC-MARH-07] Failed to load template, using default: {e}")
+            return default_prompt
+
+    async def _force_final_answer_fc(self, messages: list[dict[str, Any]]) -> str:
+        """Force final answer when max iterations reached in Function Calling mode."""
+        try:
+            response = await self._llm_client.generate(
+                messages=messages + [{"role": "user", "content": "请基于以上信息给出最终回答，不要再调用工具。"}],
+                tools=None,
+            )
+            return response.content or "抱歉，我已经尽力处理您的请求，但可能需要更多信息。"
+        except Exception as e:
+            logger.error(f"[AC-MARH-07] Force final answer FC failed: {e}")
+            return "抱歉，我已经尽力处理您的请求，但可能需要更多信息。请稍后重试或联系人工客服。"
+
+    async def _execute_react(
+        self,
+        user_message: str,
+        context: dict[str, Any] | None = None,
+        on_thought: Any = None,
+        on_action: Any = None,
+    ) -> tuple[str, ReActContext, TraceInfo]:
+        """
+        Execute using traditional ReAct mode (text-based).
+        
+        This is the original implementation for backward compatibility.
+        """
         react_ctx = ReActContext(max_iterations=self._max_iterations)
         tool_calls: list[ToolCallTrace] = []
         start_time = time.time()
@@ -321,58 +804,108 @@ Action Input:
             return default_template
     
     def _build_tools_section(self) -> str:
-        """Build rich tools section for ReAct prompt."""
+        """
+        Build compact tools section for ReAct prompt.
+        
+        Only includes tool name and brief description for initial scanning.
+        Detailed usage guides are disclosed on-demand when tool is called.
+        """
         if not self._tool_registry:
             return "当前没有可用的工具。"
 
-        tools = self._tool_registry.list_tools(enabled_only=True)
+        tools = self._tool_registry.get_all_tools()
         if not tools:
             return "当前没有可用的工具。"
 
-        lines = ["## 可用工具列表", "", "以下是你可以使用的工具，只能使用这些工具：", ""]
+        lines = ["## 可用工具列表", "", "以下是你可以使用的工具：", ""]
 
         for tool in tools:
+            tool_guide = self._guide_registry.get_tool_guide(tool.name) if self._guide_registry else None
+            description = tool_guide.description if tool_guide else tool.description
+            lines.append(f"- **{tool.name}**: {description}")
+
+        lines.append("")
+        lines.append("调用工具时，系统会提供该工具的详细使用说明。")
+
+        return "\n".join(lines)
+    
+    def _build_tool_usage_guide(self, tool_name: str) -> str:
+        """
+        Build detailed usage guide for a specific tool.
+        Called when the tool is executed to provide on-demand guidance.
+        """
+        tool_guide = self._guide_registry.get_tool_guide(tool_name) if self._guide_registry else None
+        tool = self._tool_registry.get_tool(tool_name) if self._tool_registry else None
+        
+        if not tool_guide and not tool:
+            return ""
+        
+        lines = [f"## {tool_name} 使用说明", ""]
+        
+        if tool_guide:
+            lines.append(f"**用途**: {tool_guide.description}")
+            lines.append("")
+            
+            if tool_guide.triggers:
+                lines.append("**适用场景**:")
+                for trigger in tool_guide.triggers:
+                    lines.append(f"- {trigger}")
+                lines.append("")
+            
+            if tool_guide.anti_triggers:
+                lines.append("**不适用场景**:")
+                for anti in tool_guide.anti_triggers:
+                    lines.append(f"- {anti}")
+                lines.append("")
+            
+            if tool_guide.content:
+                lines.append(tool_guide.content)
+                lines.append("")
+        
+        if tool:
             meta = tool.metadata or {}
-            lines.append(f"### {tool.name}")
-            lines.append(f"用途: {tool.description}")
-
-            when_to_use = meta.get("when_to_use")
-            when_not_to_use = meta.get("when_not_to_use")
-            if when_to_use:
-                lines.append(f"何时使用: {when_to_use}")
-            if when_not_to_use:
-                lines.append(f"何时不要使用: {when_not_to_use}")
-
             params = meta.get("parameters")
             if isinstance(params, dict):
                 properties = params.get("properties", {})
                 required = params.get("required", [])
                 if properties:
-                    lines.append("参数:")
+                    lines.append("**参数说明**:")
                     for param_name, param_info in properties.items():
                         param_desc = param_info.get("description", "") if isinstance(param_info, dict) else ""
-                        line = f"  - {param_name}: {param_desc}".strip()
+                        req_mark = " (必填)" if param_name in required else ""
                         if param_name == "tenant_id":
-                            line += " (系统注入，模型不要填写)"
-                        elif param_name in required:
-                            line += " (必填)"
-                        lines.append(line)
+                            req_mark = " (系统注入)"
+                        lines.append(f"- `{param_name}`: {param_desc}{req_mark}")
+                    lines.append("")
 
             if meta.get("example_action_input"):
-                lines.append("示例入参(JSON):")
+                lines.append("**调用示例**:")
                 try:
-                    example_text = json.dumps(meta["example_action_input"], ensure_ascii=False)
+                    example_text = json.dumps(meta["example_action_input"], ensure_ascii=False, indent=2)
                 except Exception:
                     example_text = str(meta["example_action_input"])
-                lines.append(example_text)
+                lines.append(f"```json\n{example_text}\n```")
+                lines.append("")
 
             if meta.get("result_interpretation"):
-                lines.append(f"结果解释: {meta['result_interpretation']}")
-
-            lines.append("")
+                lines.append(f"**结果说明**: {meta['result_interpretation']}")
+                lines.append("")
         
         return "\n".join(lines)
     
+    def _build_tools_guide_section(self, tool_names: list[str] | None = None) -> str:
+        """
+        Build detailed tools guide section for ReAct prompt.
+        
+        This provides comprehensive usage guides from ToolRegistry.
+        Called separately from _build_tools_section for flexibility.
+        
+        Args:
+            tool_names: If provided, only include tools for these names.
+                       If None, include all tools.
+        """
+        return self._guide_registry.build_tools_prompt_section(tool_names)
+
     def _extract_json_object(self, text: str) -> dict[str, Any] | None:
         """Extract the first valid JSON object from free text."""
         candidates = []
@@ -438,6 +971,8 @@ Action Input:
     ) -> tuple[ToolResult, ToolCallTrace]:
         """
         [AC-MARH-07, AC-MARH-08] Execute tool action with timeout.
+        
+        On first call to a tool, appends detailed usage guide to observation.
         """
         tool_name = thought.action or "unknown"
         start_time = time.time()
@@ -461,6 +996,23 @@ Action Input:
             if self._tenant_id:
                 tool_args["tenant_id"] = self._tenant_id
             
+            if self._user_id:
+                tool_args["user_id"] = self._user_id
+            
+            if self._session_id:
+                tool_args["session_id"] = self._session_id
+
+            if tool_name == "kb_search_dynamic":
+                # 确保 context 存在，供 AI 传入动态过滤条件
+                if "context" not in tool_args:
+                    tool_args["context"] = {}
+                # scene 参数由 AI 从元数据中选择，系统不强制覆盖
+
+            logger.info(
+                f"[AC-MARH-07] Tool call starting: tool={tool_name}, "
+                f"action_input={thought.action_input}, final_args={tool_args}"
+            )
+
             result = await asyncio.wait_for(
                 self._tool_registry.execute(
                     tool_name=tool_name,
@@ -470,9 +1022,25 @@ Action Input:
             )
 
             duration_ms = int((time.time() - start_time) * 1000)
+            
+            called_tools = {tc.tool_name for tc in react_ctx.tool_calls}
+            is_first_call = tool_name not in called_tools
+            
+            output = result.output
+            if is_first_call and result.success:
+                usage_guide = self._build_tool_usage_guide(tool_name)
+                if usage_guide:
+                    if isinstance(output, dict):
+                        output = dict(output)
+                        output["_tool_guide"] = usage_guide
+                    elif isinstance(output, str):
+                        output = f"{output}\n\n---\n{usage_guide}"
+                    else:
+                        output = {"result": output, "_tool_guide": usage_guide}
+
             return ToolResult(
                 success=result.success,
-                output=result.output,
+                output=output,
                 error=result.error,
                 duration_ms=duration_ms,
             ), ToolCallTrace(
@@ -482,6 +1050,8 @@ Action Input:
                 status=ToolCallStatus.OK if result.success else ToolCallStatus.ERROR,
                 args_digest=str(thought.action_input)[:100] if thought.action_input else None,
                 result_digest=str(result.output)[:100] if result.output else None,
+                arguments=thought.action_input,
+                result=output,
             )
 
         except asyncio.TimeoutError:
@@ -497,6 +1067,7 @@ Action Input:
                 duration_ms=duration_ms,
                 status=ToolCallStatus.TIMEOUT,
                 error_code="TOOL_TIMEOUT",
+                arguments=thought.action_input,
             )
 
         except Exception as e:
@@ -512,6 +1083,7 @@ Action Input:
                 duration_ms=duration_ms,
                 status=ToolCallStatus.ERROR,
                 error_code="TOOL_ERROR",
+                arguments=thought.action_input,
             )
 
     async def _force_final_answer(

ai-service/app/services/mid/runtime_observer.py

@@ -53,24 +53,35 @@ class RuntimeContext:
 
     def to_trace_info(self) -> TraceInfo:
         """转换为 TraceInfo。"""
-        return TraceInfo(
-            mode=self.mode,
-            intent=self.intent,
-            request_id=self.request_id,
-            generation_id=self.generation_id,
-            guardrail_triggered=self.guardrail_triggered,
-            guardrail_rule_id=self.guardrail_rule_id,
-            interrupt_consumed=self.interrupt_consumed,
-            kb_tool_called=self.kb_tool_called,
-            kb_hit=self.kb_hit,
-            fallback_reason_code=self.fallback_reason_code,
-            react_iterations=self.react_iterations,
-            timeout_profile=self.timeout_profile,
-            segment_stats=self.segment_stats,
-            metrics_snapshot=self.metrics_snapshot,
-            tools_used=[tc.tool_name for tc in self.tool_calls] if self.tool_calls else None,
-            tool_calls=self.tool_calls if self.tool_calls else None,
-        )
+        try:
+            return TraceInfo(
+                mode=self.mode,
+                intent=self.intent,
+                request_id=self.request_id,
+                generation_id=self.generation_id,
+                guardrail_triggered=self.guardrail_triggered,
+                guardrail_rule_id=self.guardrail_rule_id,
+                interrupt_consumed=self.interrupt_consumed,
+                kb_tool_called=self.kb_tool_called,
+                kb_hit=self.kb_hit,
+                fallback_reason_code=self.fallback_reason_code,
+                react_iterations=self.react_iterations,
+                timeout_profile=self.timeout_profile,
+                segment_stats=self.segment_stats,
+                metrics_snapshot=self.metrics_snapshot,
+                tools_used=[tc.tool_name for tc in self.tool_calls] if self.tool_calls else None,
+                tool_calls=self.tool_calls if self.tool_calls else None,
+            )
+        except Exception as e:
+            import traceback
+            logger.error(
+                f"[RuntimeObserver] Failed to create TraceInfo: {e}\n"
+                f"Exception type: {type(e).__name__}\n"
+                f"Context: mode={self.mode}, request_id={self.request_id}, "
+                f"generation_id={self.generation_id}\n"
+                f"Traceback:\n{traceback.format_exc()}"
+            )
+            raise
 
 
 class RuntimeObserver:

ai-service/app/services/mid/tool_call_recorder.py

@@ -127,7 +127,8 @@ class ToolCallRecorder:
         logger.info(
             f"[AC-IDMP-15] Tool call recorded: tool={trace.tool_name}, "
             f"type={trace.tool_type.value}, duration_ms={trace.duration_ms}, "
-            f"status={trace.status.value}, session={session_id}"
+            f"status={trace.status.value}, session={session_id}, "
+            f"args_digest={trace.args_digest}, result_digest={trace.result_digest}"
         )
 
     def record_success(
@@ -153,6 +154,8 @@ class ToolCallRecorder:
             auth_applied=auth_applied,
             args_digest=ToolCallTrace.compute_digest(args) if args else None,
             result_digest=ToolCallTrace.compute_digest(result) if result else None,
+            arguments=args if isinstance(args, dict) else None,
+            result=result,
         )
         self.record(session_id, trace)
         return trace
@@ -179,6 +182,7 @@ class ToolCallRecorder:
             registry_version=registry_version,
             auth_applied=auth_applied,
             args_digest=ToolCallTrace.compute_digest(args) if args else None,
+            arguments=args if isinstance(args, dict) else None,
         )
         self.record(session_id, trace)
         return trace
@@ -207,6 +211,7 @@ class ToolCallRecorder:
             registry_version=registry_version,
             auth_applied=auth_applied,
             args_digest=ToolCallTrace.compute_digest(args) if args else None,
+            arguments=args if isinstance(args, dict) else None,
         )
         self.record(session_id, trace)
         return trace
@@ -231,6 +236,7 @@ class ToolCallRecorder:
             error_code=reason,
             registry_version=registry_version,
             args_digest=ToolCallTrace.compute_digest(args) if args else None,
+            arguments=args if isinstance(args, dict) else None,
         )
         self.record(session_id, trace)
         return trace

ai-service/app/services/mid/tool_converter.py

@@ -0,0 +1,111 @@
+"""
+Tool definition converter for Function Calling.
+Converts ToolRegistry definitions to LLM ToolDefinition format.
+"""
+
+import logging
+from typing import Any
+
+from app.services.llm.base import ToolDefinition
+from app.services.mid.tool_registry import ToolDefinition as RegistryToolDefinition
+
+logger = logging.getLogger(__name__)
+
+
+def convert_tool_to_llm_format(tool: RegistryToolDefinition) -> ToolDefinition:
+    """
+    Convert ToolRegistry tool definition to LLM ToolDefinition format.
+    
+    Args:
+        tool: Tool definition from ToolRegistry
+        
+    Returns:
+        ToolDefinition for Function Calling
+    """
+    meta = tool.metadata or {}
+    parameters = meta.get("parameters", {
+        "type": "object",
+        "properties": {},
+        "required": [],
+    })
+    
+    if not isinstance(parameters, dict):
+        parameters = {
+            "type": "object",
+            "properties": {},
+            "required": [],
+        }
+    
+    if "type" not in parameters:
+        parameters["type"] = "object"
+    if "properties" not in parameters:
+        parameters["properties"] = {}
+    if "required" not in parameters:
+        parameters["required"] = []
+    
+    properties = parameters.get("properties", {})
+    if "tenant_id" in properties:
+        properties = {k: v for k, v in properties.items() if k != "tenant_id"}
+    if "user_id" in properties:
+        properties = {k: v for k, v in properties.items() if k != "user_id"}
+    if "session_id" in properties:
+        properties = {k: v for k, v in properties.items() if k != "session_id"}
+    
+    parameters["properties"] = properties
+    
+    required = parameters.get("required", [])
+    required = [r for r in required if r not in ("tenant_id", "user_id", "session_id")]
+    parameters["required"] = required
+    
+    return ToolDefinition(
+        name=tool.name,
+        description=tool.description,
+        parameters=parameters,
+    )
+
+
+def convert_tools_to_llm_format(tools: list[RegistryToolDefinition]) -> list[ToolDefinition]:
+    """
+    Convert multiple tool definitions to LLM format.
+    
+    Args:
+        tools: List of tool definitions from ToolRegistry
+        
+    Returns:
+        List of ToolDefinition for Function Calling
+    """
+    return [convert_tool_to_llm_format(tool) for tool in tools]
+
+
+def build_tool_result_message(
+    tool_call_id: str,
+    tool_name: str,
+    result: dict[str, Any],
+    tool_guide: str | None = None,
+) -> dict[str, str]:
+    """
+    Build a tool result message for the conversation.
+    
+    Args:
+        tool_call_id: ID of the tool call
+        tool_name: Name of the tool
+        result: Tool execution result
+        tool_guide: Optional tool usage guide to append
+        
+    Returns:
+        Message dict with role='tool'
+    """
+    if isinstance(result, dict):
+        result_copy = {k: v for k, v in result.items() if k != "_tool_guide"}
+        content = str(result_copy)
+    else:
+        content = str(result)
+    
+    if tool_guide:
+        content = f"{content}\n\n---\n{tool_guide}"
+    
+    return {
+        "role": "tool",
+        "tool_call_id": tool_call_id,
+        "content": content,
+    }

ai-service/app/services/mid/tool_guide_registry.py

@@ -0,0 +1,313 @@
+"""
+Tool Guide Registry for Mid Platform.
+Provides tool-based usage guidance with caching support.
+
+Tool guides are usage manuals for tools, loaded on-demand with metadata scanning.
+This separates tool definitions (Function Calling) from usage guides (Tool Guides).
+"""
+
+import logging
+import re
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+TOOLS_DIR = Path(__file__).parent.parent.parent.parent / "tools"
+
+
+@dataclass
+class ToolGuideMetadata:
+    """Lightweight tool guide metadata for quick scanning (~100 tokens)."""
+    name: str
+    description: str
+    triggers: list[str] = field(default_factory=list)
+    anti_triggers: list[str] = field(default_factory=list)
+    tools: list[str] = field(default_factory=list)
+
+
+@dataclass
+class ToolGuideDefinition:
+    """Full tool guide definition with complete content."""
+    name: str
+    description: str
+    triggers: list[str]
+    anti_triggers: list[str]
+    tools: list[str]
+    content: str
+    raw_markdown: str
+
+
+class ToolGuideRegistry:
+    """
+    Tool guide registry with caching support.
+    
+    Features:
+    - Load tool guides from .md files
+    - Cache tool guides in memory for high-frequency access
+    - Provide lightweight metadata for quick scanning
+    - Provide full content on demand
+    """
+    
+    _instance = None
+    _initialized = False
+    
+    def __new__(cls, *args, **kwargs):
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+        return cls._instance
+    
+    def __init__(self, tools_dir: Path | None = None):
+        if ToolGuideRegistry._initialized:
+            return
+        
+        self._tools_dir = tools_dir or TOOLS_DIR
+        self._tool_guides: dict[str, ToolGuideDefinition] = {}
+        self._metadata_cache: dict[str, ToolGuideMetadata] = {}
+        self._tool_to_guide: dict[str, str] = {}
+        self._loaded = False
+        
+        ToolGuideRegistry._initialized = True
+        logger.info(f"[ToolGuideRegistry] Initialized with tools_dir={self._tools_dir}")
+    
+    def load_tools(self, force_reload: bool = False) -> None:
+        """
+        Load all tool guides from tools directory into cache.
+        
+        Args:
+            force_reload: Force reload even if already loaded
+        """
+        if self._loaded and not force_reload:
+            logger.debug("[ToolGuideRegistry] Tool guides already loaded, skipping")
+            return
+        
+        if not self._tools_dir.exists():
+            logger.warning(f"[ToolGuideRegistry] Tools directory not found: {self._tools_dir}")
+            return
+        
+        self._tool_guides.clear()
+        self._metadata_cache.clear()
+        self._tool_to_guide.clear()
+        
+        for tool_file in self._tools_dir.glob("*.md"):
+            try:
+                tool_guide = self._parse_tool_file(tool_file)
+                if tool_guide:
+                    self._tool_guides[tool_guide.name] = tool_guide
+                    self._metadata_cache[tool_guide.name] = ToolGuideMetadata(
+                        name=tool_guide.name,
+                        description=tool_guide.description,
+                        triggers=tool_guide.triggers,
+                        anti_triggers=tool_guide.anti_triggers,
+                        tools=tool_guide.tools,
+                    )
+                    for tool_name in tool_guide.tools:
+                        self._tool_to_guide[tool_name] = tool_guide.name
+                    logger.info(f"[ToolGuideRegistry] Loaded tool guide: {tool_guide.name} (tools: {tool_guide.tools})")
+            except Exception as e:
+                logger.error(f"[ToolGuideRegistry] Failed to load tool guide from {tool_file}: {e}")
+        
+        self._loaded = True
+        logger.info(f"[ToolGuideRegistry] Loaded {len(self._tool_guides)} tool guides")
+    
+    def _parse_tool_file(self, file_path: Path) -> ToolGuideDefinition | None:
+        """
+        Parse a tool guide markdown file.
+        
+        Expected format:
+        ---
+        name: tool_name
+        description: Tool description
+        triggers:
+          - trigger 1
+          - trigger 2
+        anti_triggers:
+          - anti trigger 1
+        tools:
+          - tool_name
+        ---
+        
+        ## Usage Guide
+        ...
+        """
+        content = file_path.read_text(encoding="utf-8")
+        
+        frontmatter_match = re.match(r"^---\s*\n(.*?)\n---\s*\n(.*)$", content, re.DOTALL)
+        if not frontmatter_match:
+            logger.warning(f"[ToolGuideRegistry] No frontmatter found in {file_path}")
+            return None
+        
+        frontmatter_text = frontmatter_match.group(1)
+        body = frontmatter_match.group(2)
+        
+        metadata: dict[str, Any] = {}
+        current_key = None
+        current_list: list[str] | None = None
+        
+        for line in frontmatter_text.split("\n"):
+            if not line.strip():
+                continue
+            
+            key_match = re.match(r"^(\w+):\s*(.*)$", line)
+            if key_match:
+                current_key = key_match.group(1)
+                value = key_match.group(2).strip()
+                
+                if value:
+                    metadata[current_key] = value
+                    current_list = None
+                else:
+                    current_list = []
+                    metadata[current_key] = current_list
+            elif line.startswith("  - ") and current_list is not None:
+                current_list.append(line[4:].strip())
+        
+        name = metadata.get("name", file_path.stem)
+        description = metadata.get("description", "")
+        triggers = metadata.get("triggers", [])
+        anti_triggers = metadata.get("anti_triggers", [])
+        tools = metadata.get("tools", [])
+        
+        if isinstance(triggers, str):
+            triggers = [triggers]
+        if isinstance(anti_triggers, str):
+            anti_triggers = [anti_triggers]
+        if isinstance(tools, str):
+            tools = [tools]
+        
+        return ToolGuideDefinition(
+            name=name,
+            description=description,
+            triggers=triggers,
+            anti_triggers=anti_triggers,
+            tools=tools,
+            content=body.strip(),
+            raw_markdown=content,
+        )
+    
+    def get_tool_guide(self, name: str) -> ToolGuideDefinition | None:
+        """Get full tool guide definition by name."""
+        if not self._loaded:
+            self.load_tools()
+        return self._tool_guides.get(name)
+    
+    def get_tool_metadata(self, name: str) -> ToolGuideMetadata | None:
+        """Get lightweight tool guide metadata by name."""
+        if not self._loaded:
+            self.load_tools()
+        return self._metadata_cache.get(name)
+    
+    def get_guide_for_tool(self, tool_name: str) -> ToolGuideDefinition | None:
+        """Get tool guide associated with a tool."""
+        if not self._loaded:
+            self.load_tools()
+        guide_name = self._tool_to_guide.get(tool_name)
+        if guide_name:
+            return self._tool_guides.get(guide_name)
+        return None
+    
+    def list_tools(self) -> list[str]:
+        """List all tool guide names."""
+        if not self._loaded:
+            self.load_tools()
+        return list(self._tool_guides.keys())
+    
+    def list_tool_metadata(self) -> list[ToolGuideMetadata]:
+        """List all tool guide metadata (lightweight)."""
+        if not self._loaded:
+            self.load_tools()
+        return list(self._metadata_cache.values())
+    
+    def build_tools_prompt_section(self, tool_names: list[str] | None = None) -> str:
+        """
+        Build tools section for ReAct prompt.
+        
+        Args:
+            tool_names: If provided, only include tools for these names.
+                       If None, include all tools.
+        
+        Returns:
+            Formatted tools section string
+        """
+        if not self._loaded:
+            self.load_tools()
+        
+        if not self._tool_guides:
+            return ""
+        
+        tools_to_include: list[ToolGuideDefinition] = []
+        
+        if tool_names:
+            for tool_name in tool_names:
+                tool_guide = self.get_guide_for_tool(tool_name)
+                if tool_guide and tool_guide not in tools_to_include:
+                    tools_to_include.append(tool_guide)
+        else:
+            tools_to_include = list(self._tool_guides.values())
+        
+        if not tools_to_include:
+            return ""
+        
+        lines = ["## 工具使用指南", ""]
+        lines.append("以下是每个工具的详细使用说明：")
+        lines.append("")
+        
+        for tool_guide in tools_to_include:
+            lines.append(f"### {tool_guide.name}")
+            lines.append(f"描述: {tool_guide.description}")
+            
+            if tool_guide.triggers:
+                lines.append("触发条件:")
+                for trigger in tool_guide.triggers:
+                    lines.append(f"  - {trigger}")
+            
+            if tool_guide.anti_triggers:
+                lines.append("不应触发:")
+                for anti in tool_guide.anti_triggers:
+                    lines.append(f"  - {anti}")
+            
+            lines.append("")
+            lines.append(tool_guide.content)
+            lines.append("")
+        
+        return "\n".join(lines)
+    
+    def build_compact_tools_section(self) -> str:
+        """
+        Build compact tools section with only name and description.
+        This is used for the initial tool list, with full guidance loaded separately.
+        """
+        if not self._loaded:
+            self.load_tools()
+        
+        if not self._metadata_cache:
+            return "当前没有可用的工具使用指南。"
+        
+        lines = ["## 可用工具列表", "", "以下是你可以使用的工具：", ""]
+        
+        for meta in self._metadata_cache.values():
+            lines.append(f"- **{meta.name}**: {meta.description}")
+            if meta.tools:
+                lines.append(f"  关联工具: {', '.join(meta.tools)}")
+        
+        return "\n".join(lines)
+
+
+_tool_guide_registry: ToolGuideRegistry | None = None
+
+
+def get_tool_guide_registry() -> ToolGuideRegistry:
+    """Get global tool guide registry instance."""
+    global _tool_guide_registry
+    if _tool_guide_registry is None:
+        _tool_guide_registry = ToolGuideRegistry()
+    return _tool_guide_registry
+
+
+def init_tool_guide_registry(tools_dir: Path | None = None) -> ToolGuideRegistry:
+    """Initialize and return tool guide registry."""
+    global _tool_guide_registry
+    _tool_guide_registry = ToolGuideRegistry(tools_dir=tools_dir)
+    _tool_guide_registry.load_tools()
+    return _tool_guide_registry

ai-service/app/services/mid/tool_registry.py

@@ -117,172 +117,124 @@ class ToolRegistry:
         self._tools[name] = tool
         
         logger.info(
-            f"[AC-IDMP-19] Tool registered: name={name}, type={tool_type.value}, "
-            f"version={version}, auth_required={auth_required}"
+            f"[AC-IDMP-19] Registered tool: {name} v{version} "
+            f"(type={tool_type.value}, auth={auth_required}, timeout={timeout_ms}ms)"
         )
         
         return tool
     
-    def unregister(self, name: str) -> bool:
-        """Unregister a tool."""
-        if name in self._tools:
-            del self._tools[name]
-            logger.info(f"[AC-IDMP-19] Tool unregistered: {name}")
-            return True
-        return False
-    
     def get_tool(self, name: str) -> ToolDefinition | None:
-        """Get tool definition by name."""
+        """Get tool by name."""
         return self._tools.get(name)
     
-    def list_tools(
-        self,
-        tool_type: ToolType | None = None,
-        enabled_only: bool = True,
-    ) -> list[ToolDefinition]:
-        """List registered tools, optionally filtered."""
-        tools = list(self._tools.values())
+    def list_tools(self) -> list[str]:
+        """List all registered tool names."""
+        return list(self._tools.keys())
     
-        if tool_type:
-            tools = [t for t in tools if t.tool_type == tool_type]
+    def get_all_tools(self) -> list[ToolDefinition]:
+        """Get all registered tools."""
+        return list(self._tools.values())
     
-        if enabled_only:
-            tools = [t for t in tools if t.enabled]
+    def is_enabled(self, name: str) -> bool:
+        """Check if tool is enabled."""
+        tool = self._tools.get(name)
+        return tool.enabled if tool else False
     
-        return tools
-    
-    def enable_tool(self, name: str) -> bool:
-        """Enable a tool."""
+    def set_enabled(self, name: str, enabled: bool) -> bool:
+        """Enable or disable a tool."""
         tool = self._tools.get(name)
         if tool:
-            tool.enabled = True
-            logger.info(f"[AC-IDMP-19] Tool enabled: {name}")
-            return True
-        return False
-    
-    def disable_tool(self, name: str) -> bool:
-        """Disable a tool."""
-        tool = self._tools.get(name)
-        if tool:
-            tool.enabled = False
-            logger.info(f"[AC-IDMP-19] Tool disabled: {name}")
+            tool.enabled = enabled
+            logger.info(f"[AC-IDMP-19] Tool {name} {'enabled' if enabled else 'disabled'}")
             return True
         return False
     
     async def execute(
         self,
-        tool_name: str,
-        args: dict[str, Any],
-        auth_context: dict[str, Any] | None = None,
+        name: str,
+        **kwargs: Any,
     ) -> ToolExecutionResult:
         """
-        [AC-IDMP-19] Execute a tool with governance.
+        Execute a tool with governance.
         
         Args:
-            tool_name: Tool name to execute
-            args: Tool arguments
-            auth_context: Authentication context
+            name: Tool name
+            **kwargs: Tool arguments
         
         Returns:
             ToolExecutionResult with output and metadata
         """
-        start_time = time.time()
-        
-        tool = self._tools.get(tool_name)
+        tool = self._tools.get(name)
         if not tool:
-            logger.warning(f"[AC-IDMP-19] Tool not found: {tool_name}")
             return ToolExecutionResult(
                 success=False,
-                error=f"Tool not found: {tool_name}",
-                duration_ms=0,
+                error=f"Tool not found: {name}",
+                registry_version=self._version,
             )
         
         if not tool.enabled:
-            logger.warning(f"[AC-IDMP-19] Tool disabled: {tool_name}")
             return ToolExecutionResult(
                 success=False,
-                error=f"Tool disabled: {tool_name}",
-                duration_ms=0,
-                registry_version=tool.version,
+                error=f"Tool is disabled: {name}",
+                registry_version=self._version,
             )
         
-        auth_applied = False
-        if tool.auth_required:
-            if not auth_context:
-                logger.warning(f"[AC-IDMP-19] Auth required but no context: {tool_name}")
-                return ToolExecutionResult(
-                    success=False,
-                    error="Authentication required",
-                    duration_ms=int((time.time() - start_time) * 1000),
-                    auth_applied=False,
-                    registry_version=tool.version,
-                )
-            auth_applied = True
+        start_time = time.time()
         
         try:
-            timeout_seconds = tool.timeout_ms / 1000.0
+            if not tool.handler:
+                return ToolExecutionResult(
+                    success=False,
+                    error=f"Tool has no handler: {name}",
+                    registry_version=self._version,
+                )
             
-            result = await asyncio.wait_for(
-                tool.handler(**args) if tool.handler else asyncio.sleep(0),
-                timeout=timeout_seconds,
+            result = await self._timeout_governor.execute_with_timeout(
+                lambda: tool.handler(**kwargs),
+                timeout_ms=tool.timeout_ms,
             )
             
             duration_ms = int((time.time() - start_time) * 1000)
             
-            logger.info(
-                f"[AC-IDMP-19] Tool executed: name={tool_name}, "
-                f"duration_ms={duration_ms}, success=True"
-            )
-            
             return ToolExecutionResult(
                 success=True,
                 output=result,
                 duration_ms=duration_ms,
-                auth_applied=auth_applied,
-                registry_version=tool.version,
+                auth_applied=tool.auth_required,
+                registry_version=self._version,
             )
             
         except asyncio.TimeoutError:
             duration_ms = int((time.time() - start_time) * 1000)
-            logger.warning(
-                f"[AC-IDMP-19] Tool timeout: name={tool_name}, "
-                f"duration_ms={duration_ms}"
-            )
             return ToolExecutionResult(
                 success=False,
-                error=f"Tool timeout after {tool.timeout_ms}ms",
+                error=f"Tool execution timeout after {tool.timeout_ms}ms",
                 duration_ms=duration_ms,
-                auth_applied=auth_applied,
-                registry_version=tool.version,
+                registry_version=self._version,
             )
-        
         except Exception as e:
             duration_ms = int((time.time() - start_time) * 1000)
-            logger.error(
-                f"[AC-IDMP-19] Tool error: name={tool_name}, error={e}"
-            )
+            logger.error(f"[AC-IDMP-19] Tool execution error: {name} - {e}")
             return ToolExecutionResult(
                 success=False,
                 error=str(e),
                 duration_ms=duration_ms,
-                auth_applied=auth_applied,
-                registry_version=tool.version,
+                registry_version=self._version,
             )
     
-    def create_trace(
+    def build_trace(
         self,
         tool_name: str,
+        args: dict[str, Any],
         result: ToolExecutionResult,
-        args_digest: str | None = None,
     ) -> ToolCallTrace:
-        """
-        [AC-IDMP-19] Create ToolCallTrace from execution result.
-        """
-        tool = self._tools.get(tool_name)
+        """Build a tool call trace from execution result."""
+        import hashlib
+        args_digest = hashlib.md5(str(args).encode()).hexdigest()[:8]
         
         return ToolCallTrace(
             tool_name=tool_name,
-            tool_type=tool.tool_type if tool else ToolType.INTERNAL,
+            tool_type=tool.tool_type if (tool := self._tools.get(tool_name)) else ToolType.INTERNAL,
             registry_version=result.registry_version,
             auth_applied=result.auth_applied,
             duration_ms=result.duration_ms,
@@ -293,6 +245,8 @@ class ToolRegistry:
             error_code=result.error if not result.success else None,
             args_digest=args_digest,
             result_digest=str(result.output)[:100] if result.output else None,
+            arguments=args,
+            result=result.output,
         )
     
     def get_governance_report(self) -> dict[str, Any]: