diff --git a/pipeline_core/agent_config.py b/pipeline_core/agent_config.py
index 6fe376d..66151cf 100644
--- a/pipeline_core/agent_config.py
+++ b/pipeline_core/agent_config.py
@@ -385,6 +385,12 @@ async def load_agent_config(pipeline_id: str = None, project_id: str = None, gen
     else:
         ability = get_ability(pipeline_id) if pipeline_id else get_ability(DEFAULT_ABILITY_ID)
     tools = list(GENERAL_TOOLS)
+    # 产线隔离（2026-09-05）：纯通用会话剔除全部项目管理工具——否则通用助手
+    # 的 schema 里会出现 switch_project/project_info/list_my_projects 等，
+    # LLM 看到就能查看/切换/操作任何产线的项目（含他人产线的）。
+    # 执行层在 agent_loop_v2._dispatch_sdlc_tool 还有一道拦截兜底。
+    if generic:
+        tools = [t for t in tools if t.category != "project"]
     prompt = base.system_prompt
     if ability:
         tools = _merge_tools(ability.tools, tools)