feat(engine): 添加MCP连接管理和工具集成功能

- 集成MCP连接管理器，支持MCP服务器连接
- 添加多种内置工具：ClarifyTool、CronTool、DelegateTool、ExecuteCodeTool、
  PatchFileTool、ProcessTool、SendMessageTool、SpawnTool、TerminalTool、
  TodoTool、WebFetchTool、WebSearchTool、WriteFileTool等
- 实现工具注册和装配功能
- 添加技能选择上下文参数
- 支持思考模式控制参数thinking_enabled

feat(coordinator): 重构任务执行计划器参数命名

- 将learning_candidate_enabled重命名为allow_candidate_generation
- 更新TeamGraphScheduler中的参数传递
- 修改LocalAgentRunner中的相关参数处理
- 更新README文档中的相应描述

refactor(context): 标准化工具调用参数格式

- 添加_json导入用于参数序列化
- 实现_provider_tool_calls方法标准化OpenAI兼容的工具调用载荷
- 修复工具调用中参数非字符串类型的序列化问题

refactor(session): 优化消息历史记录过滤逻辑

- 修改get_messages_as_conversation为基于运行状态过滤消息
- 排除未完成、失败或错误结束的运行记录
- 改进对话历史的可见性控制机制

fix(store): 修复FTS索引重建逻辑

- 添加异常处理防止FTS索引创建失败
- 实现_rebuild_fts_index方法重新构建全文搜索索引
- 优化索引触发器和表的维护流程

app-instance/backend/beaver/skills/learning/missing_skill.py

@@ -1,4 +1,4 @@
-"""Synthesize draft-only skills for missing sub-agent guidance."""
+"""Synthesize ephemeral guidance for missing sub-agent skills."""
 
 from __future__ import annotations
 
@@ -6,11 +6,10 @@ import json
 import re
 from dataclasses import dataclass
 from typing import TYPE_CHECKING, Any
+from uuid import uuid4
 
 from beaver.engine.context import SkillContext
 from beaver.engine.providers import ProviderBundle
-from beaver.skills.drafts import DraftService
-from beaver.skills.specs import SkillDraft
 from beaver.skills.specs.serialization import canonical_hash
 
 if TYPE_CHECKING:
@@ -18,13 +17,14 @@ if TYPE_CHECKING:
 
 
 @dataclass(slots=True)
-class MissingSkillDraftResult:
-    draft: SkillDraft
+class EphemeralGuidanceResult:
+    guidance_id: str
+    guidance_name: str
     skill_context: SkillContext
 
 
-class MissingSkillSynthesizer:
-    """Create a draft skill and an ephemeral SkillContext for the current run."""
+class EphemeralGuidanceSynthesizer:
+    """Create one-run guidance for the current delegated sub-agent."""
 
     async def synthesize(
         self,
@@ -37,8 +37,7 @@ class MissingSkillSynthesizer:
         skill_query: str,
         required_capabilities: list[str],
         provider_bundle: ProviderBundle,
-        draft_service: DraftService,
-    ) -> MissingSkillDraftResult:
+    ) -> EphemeralGuidanceResult:
         provider = provider_bundle.auxiliary_provider or provider_bundle.main_provider
         runtime = provider_bundle.auxiliary_runtime or provider_bundle.main_runtime
         model = getattr(runtime, "model", None)
@@ -49,14 +48,14 @@ class MissingSkillSynthesizer:
                     {
                         "role": "system",
                         "content": (
-                            "You create concise Beaver skill drafts. Return only JSON with keys: "
-                            "skill_name, description, content, tags."
+                            "You create concise Beaver ephemeral guidance. Return only JSON with keys: "
+                            "guidance_name, description, content, tags."
                         ),
                     },
                     {
                         "role": "user",
                         "content": (
-                            "Create a procedural skill draft for this missing Task sub-agent guidance.\n\n"
+                            "Create procedural guidance for this missing Task sub-agent capability.\n\n"
                             f"Task goal:\n{task.goal}\n\n"
                             f"Current user request:\n{user_message}\n\n"
                             f"Node id: {node_id}\n"
@@ -64,62 +63,37 @@ class MissingSkillSynthesizer:
                             f"Skill query:\n{skill_query}\n"
                             f"Required capabilities: {required_capabilities}\n\n"
                             "The content must be actionable guidance for a temporary sub-agent. "
-                            "Do not include implementation claims or publish metadata."
+                            "Do not include implementation claims, review metadata, or publish metadata."
                         ),
                     },
                 ],
                 tools=None,
                 model=model,
-                max_tokens=1200,
+                max_tokens=4096,
                 temperature=0,
             )
             payload = self._parse_payload(response.content or "") or payload
         except Exception:
             payload = payload
 
-        skill_name = _slug(str(payload.get("skill_name") or skill_query or node_id))
+        guidance_name = _slug(str(payload.get("guidance_name") or payload.get("skill_name") or skill_query or node_id))
+        guidance_id = f"eg_{uuid4().hex}"
         content = str(payload.get("content") or "").strip()
         if not content:
             content = str(self._fallback_payload(skill_query=skill_query, node_task=node_task, capabilities=required_capabilities)["content"])
-        frontmatter = {
-            "description": str(payload.get("description") or f"Draft guidance for {skill_query or node_id}").strip(),
-            "tags": [str(item) for item in payload.get("tags") or ["generated", "task-sub-agent"]],
-            "metadata": {
-                "origin": "missing_task_subagent_skill",
-                "task_id": task.task_id,
-                "node_id": node_id,
-                "attempt_index": attempt_index,
-                "skill_query": skill_query,
-                "required_capabilities": list(required_capabilities),
-            },
-        }
-        draft = draft_service.create_new_skill_draft(
-            skill_name=skill_name,
-            proposed_content=content,
-            proposed_frontmatter=frontmatter,
-            created_by="task-skill-resolver",
-            reason="generated_for_missing_task_subagent_skill",
-            trigger_session_id=task.session_id,
-            evidence_refs=[
-                {
-                    "task_id": task.task_id,
-                    "session_id": task.session_id,
-                    "attempt_index": attempt_index,
-                    "node_id": node_id,
-                    "skill_query": skill_query,
-                    "required_capabilities": list(required_capabilities),
-                }
-            ],
-        )
         context = SkillContext(
-            name=f"draft:{draft.skill_name}",
-            content=draft.proposed_content,
-            version=f"draft:{draft.draft_id}",
-            content_hash=canonical_hash(draft.proposed_content),
-            activation_reason="generated_missing_skill",
+            name=f"ephemeral:{guidance_name}",
+            content=content,
+            version=f"ephemeral:{guidance_id}",
+            content_hash=canonical_hash(content),
+            activation_reason="ephemeral_guidance",
             tool_hints=[],
         )
-        return MissingSkillDraftResult(draft=draft, skill_context=context)
+        return EphemeralGuidanceResult(
+            guidance_id=guidance_id,
+            guidance_name=guidance_name,
+            skill_context=context,
+        )
 
     @staticmethod
     def _parse_payload(text: str) -> dict[str, Any] | None:
@@ -145,7 +119,7 @@ class MissingSkillSynthesizer:
         title = skill_query or node_task or "task subagent guidance"
         capability_lines = "\n".join(f"- {item}" for item in capabilities) or "- Follow the node task precisely."
         return {
-            "skill_name": _slug(title),
+            "guidance_name": _slug(title),
             "description": f"Draft guidance for {title}.",
             "tags": ["generated", "task-sub-agent"],
             "content": (
@@ -163,4 +137,8 @@ class MissingSkillSynthesizer:
 
 def _slug(value: str) -> str:
     cleaned = re.sub(r"[^a-zA-Z0-9]+", "-", value.strip().lower()).strip("-")
-    return cleaned[:64].strip("-") or "generated-task-subagent-skill"
+    return cleaned[:64].strip("-") or "generated-task-subagent-guidance"
+
+
+MissingSkillDraftResult = EphemeralGuidanceResult
+MissingSkillSynthesizer = EphemeralGuidanceSynthesizer