diff --git a/src/api/shared.py b/src/api/shared.py
index 8bddf0c..77d2d5b 100644
--- a/src/api/shared.py
+++ b/src/api/shared.py
@@ -1,6 +1,5 @@
 """共享 helper 和常量"""
 
-from pathlib import Path
 from typing import Any, Dict
 from fastapi import HTTPException
 
@@ -11,7 +10,7 @@ from src.blackboard.registry import ProjectRegistry
 from src.utils import get_data_root
 
 # 虚拟项目白名单
-_VIRTUAL_PROJECTS = frozenset({"_general", "_mail"})
+_VIRTUAL_PROJECTS = frozenset({"_general", "_mail", "_toolchain"})
 
 
 def _validate_project(project_id: str) -> str:
@@ -56,7 +55,8 @@ def _init_agent_ids():
     if _KNOWN_AGENT_IDS:
         return
     try:
-        import yaml, os
+        import yaml
+        import os
         cfg_path = os.path.join(os.path.dirname(__file__), "..", "..", "config", "default.yaml")
         with open(cfg_path) as f:
             cfg = yaml.safe_load(f)
diff --git a/src/api/task_routes.py b/src/api/task_routes.py
index a0e04af..d3a71e5 100644
--- a/src/api/task_routes.py
+++ b/src/api/task_routes.py
@@ -19,7 +19,6 @@ from src.api.shared import (
     _bb,
     _q,
     _task_to_dict,
-    _validate_project,
     _extract_mentions,
 )
 
@@ -56,10 +55,27 @@ async def get_task(project_id: str, task_id: str,
     if not expand:
         return result
 
-    expand_list = expand.split(",") if expand != "all" else [
-        "comments", "outputs", "reviews", "events", "decisions"
-    ]
+    # expand=all: 保持旧格式（list + 聚合字段），向后兼容前端 TaskModal
+    if expand == "all":
+        q = _q(project_id)
+        detail = q.task_detail(task_id)
+        if detail:
+            result["comments_count"] = detail.get("comments_count", 0)
+            result["outputs_count"] = detail.get("outputs_count", 0)
+            result["review_status"] = detail.get("review_status")
+            result["latest_event_detail"] = detail.get("latest_event_detail")
+        result["comments"] = [dict(c.__dict__)
+                              for c in bb.get_comments(task_id)]
+        result["outputs"] = [dict(o.__dict__) for o in bb.get_outputs(task_id)]
+        result["reviews"] = [dict(r.__dict__) for r in bb.get_reviews(task_id)]
+        result["decisions"] = [dict(d.__dict__)
+                               for d in bb.get_decisions(task_id)]
+        result["events"] = q.task_events(task_id)
+        result["experiences"] = q.task_experiences(task_id)
+        return result
 
+    # 细粒度 expand: 新格式（comments/events 带 limit + total_count）
+    expand_list = expand.split(",")
     q = _q(project_id)
 
     if "comments" in expand_list: