group_fqcd_jr/docs/evidence/20260919-t2k-c10-source-reference-downgrade.json

{
  "artifact": "t2k-c10-source-reference-downgrade",
  "generated_at": "2026-09-19T01:41:43.772361+00:00",
  "date_local": "2026-09-19",
  "purpose": "执行 C-10「知识出口来源引用」（关键路径 C-01 → C-03 → C-09 → C-06 → C-07 → C-10 的收口步）；裁定取「乙 · 本期降级」并加双向护栏",
  "scope": [
    "app/service/agent/implementations/customer_service.py（业务层：_references 降级为死代码并写明依据）",
    "tests/unit/service/test_customer_service_agent.py（护栏 A：AST 守无调用点）",
    "tests/unit/service/test_agent_governance.py（护栏 B：knowledge 来源必被拒）",
    "开发文档对应的 D2.2 / D2.4（口径回写，另见 D2.1 v6.6 / D1.6 §4.19）"
  ],
  "decision": {
    "chosen": "乙 · 本期降级（不向客户展示来源引用）",
    "rejected": "甲 · 底座方先登记知识来源并放行（需会签）",
    "why_b": "甲依赖底座方改造 ToolExecutor 与治理层放行 knowledge 来源，属不可控外部依赖；本模块今天要交付，不能把交付卡在别人会签上。乙的代价只是「不展示出处」，可追溯性并未丢失（见下）。",
    "why_not_silent": "降级不是静默丢弃：D2.2 的 FR-CS-010 与验收表、D2.4 的 §5.7 与 G4/AC-06 都写明了「本期降级」及其技术原因与启用前提，避免下一轮误当成已完成功能。",
    "reversibility": "完全可逆：代码本体（_references）保留在位，护栏只是禁止调用；底座方放行后删掉护栏断言即可接通。"
  },
  "technical_reason": {
    "gate": "app/service/agent/governance.py:314-316（review_output 的来源白名单只认 memory / tool）",
    "failure_mode": "knowledge 来源会被判为「引用未来自本次已授权召回结果」，抛出 ForbiddenAgentError ⇒ **整个 run 失败**，不是降级、也不是少一个字段",
    "red_line": "S-8",
    "traceability_instead": "可追溯性由审计承接：agent.tool_executed 的工具调用记录含命中 doc_id 与分数；消息表亦留痕"
  },
  "implementation": {
    "docstring": "_references() 的 docstring 重写为「保留待用的死代码 —— 本期（MVP）不向客户展示来源引用」，写明 governance.py:314-316、S-8、审计承接、启用前提须会签",
    "helper_state": "函数体原样保留（source_type=\"knowledge\" 的 SourceReference 组装逻辑未改）",
    "no_call_sites": "改用其他出口返回正文；零调用点"
  },
  "guardrails": {
    "A_ast_no_call": {
      "file": "tests/unit/service/test_customer_service_agent.py",
      "test": "test_knowledge_exit_never_calls_the_disabled_reference_helper",
      "method": "ast.walk 找 ast.Call 且 func.attr == \"_references\"，断言 calls == []",
      "why_ast": "该名字会合法出现在注释与文档字符串里，纯文本搜索会把「提一句」误判成「调用」",
      "second_assert": "同时断言 _references 函数定义仍在位（清理时不得被连带删除）"
    },
    "B_governance_rejects": {
      "file": "tests/unit/service/test_agent_governance.py",
      "test": "test_knowledge_reference_is_rejected_so_it_must_stay_disabled",
      "method": "以 source_type=\"knowledge\" 的 SourceReference 调 review_output，断言抛 ForbiddenAgentError",
      "why": "把「本期为何必须降级」的技术原因钉成可执行断言：若将来底座放行，这个测试会失败并提醒同步移除护栏 A"
    }
  },
  "html_downgrade_points": [
    {
      "doc": "D2.2",
      "locator": "FR-CS-010 行",
      "change": "追加 ⏸ 2026-09-19 本期降级说明 + <span class=\"pill p2\">⏸ 本期降级</span>"
    },
    {
      "doc": "D2.2",
      "locator": "US-CS-01 行",
      "change": "期望值补「⏸ 本期不展示来源引用：C-10 乙」"
    },
    {
      "doc": "D2.2",
      "locator": "验收表 · 一 · 功能正确性",
      "change": "「每条须带来源引用」→「⏸ 本期豁免（改由审计承接）」"
    },
    {
      "doc": "D2.4",
      "locator": "§5.7 末尾",
      "change": "追加降级段：governance.py:314-316、S-8、_references() 死代码 + 护栏、启用前提须会签"
    },
    {
      "doc": "D2.4",
      "locator": "G4 行",
      "change": "「可追溯」补「⏸ 本期：来源引用降级，可追溯性由审计承接」"
    },
    {
      "doc": "D2.4",
      "locator": "§5.7 三条要求 ①",
      "change": "「知识类回答必须附来源」补「⏸ 本期降级，见下段」（本轮新发现的口径残留，与降级冲突）"
    },
    {
      "doc": "D2.4",
      "locator": "AC-06 行",
      "change": "判据补「⏸ 本期豁免：C-10 乙不展示来源引用，改由审计承接」（同上，本轮新发现）"
    }
  ],
  "eol_check": {
    "D2.2": "CRLF（本轮编辑后复核）",
    "D2.4": "LF —— 编辑后实测 bytes=147917, bareLF=1758, CRLF=0，与改前同为纯 LF，EOL 未被改写"
  },
  "gates": {
    "targeted_pytest": {
      "files": 4,
      "passed": 164,
      "failed": 0,
      "command": "pytest -q tests/unit/service/test_customer_service_agent.py tests/unit/service/test_agent_governance.py tests/unit/core/test_customer_service_rules.py tests/unit/core/test_compliance_context.py"
    },
    "ruff": {
      "scope": "app tests tools",
      "errors": 22,
      "note": "等于基线，无新增"
    },
    "mypy": {
      "scope": "app",
      "errors": 3,
      "note": "等于基线（agent_persistence_service.py:82 / run_query_service.py:79 / promotion_renderer.py:84，均为既有问题）"
    }
  },
  "not_done_in_this_step": [],
  "open_questions": {
    "C-10_enablement": "若后续要展示出处，需底座方：① ToolExecutor 把工具返回的知识 doc_id 登记为本次可引用来源；② 治理层放行 knowledge 来源。两步都要会签。"
  },
  "closure_after": {
    "document_writeback": "已完成：D2.1 升 v6.6（C-10 行标 [x] + 修订要点）、D1.6 新增 §4.19（第十五轮会话记录）",
    "full_gate": "已完成，见 full_gate"
  },
  "full_gate": {
    "pytest": {
      "command": "pytest -q -p no:cacheprovider",
      "result": "2 failed / 1579 passed / 2 skipped",
      "note": "2 failed = T0 基线同两项（profile_snapshot_current_invariant / worker_runtime[False]），不计入本轮回归；passed 1577 → 1579，增量 = 本步新增的 2 条护栏"
    },
    "ruff": {
      "command": "ruff check app tests tools",
      "errors": 22,
      "note": "= 基线"
    },
    "mypy": {
      "command": "mypy app",
      "errors": 3,
      "note": "= 基线"
    },
    "authoritative_docs": {
      "command": "python tools/check_authoritative_docs.py",
      "result": "checked 50 documents, no number collision"
    }
  },
  "environment_finding": {
    "title": "残留 Worker 抢消费 outbox 事件 ⇒ 集成测试偶发失败（环境级，非代码回归）",
    "first_symptom": "全量首跑多出第 3 个失败：tests/integration/test_memory_extraction.py::test_memory_is_not_recallable_across_customers",
    "diagnosis_steps": [
      "① 单文件重跑两次 → 3/3 通过 ⇒ 不稳定，不是确定性缺陷",
      "② 按同一链路脚本复现 seed → enqueue → consume_once → 返回 True ⇒ 消费机制本身正常",
      "③ 无人消费检测：插入一条 pending 事件后只观察、不消费 → 1 秒内被外部进程改成 published ⇒ 存在外部消费者"
    ],
    "root_cause": "2026-09-18 17:52 启动的残留服务一直存活，其中 python -m app.worker 会抢消费 outbox 事件，与测试自身的 consume_once(aggregate_id=...) 竞争，先到先得 ⇒ 测试偶发拿不到事件而返回 False",
    "processes": [
      {
        "pid": 27204,
        "child": 8740,
        "cmd": "uvicorn app.main:app --host 127.0.0.1 --port 8000"
      },
      {
        "pid": 27084,
        "child": 2204,
        "cmd": "python -m app.worker"
      }
    ],
    "action": "经用户批准，已 Stop-Process 停掉 4 个 PID；停止后全量 pytest 回到 2 failed 基线",
    "reusable_lessons": [
      "与 A-02「门禁基线前先停 Worker」完全吻合 —— 该前置不是形式主义，不停就会污染集成测试",
      "印证 S-7：知识集合重建后这两个服务早已过期",
      "遇到集成测试失败，先做「无人消费检测」排除外部消费者，再怀疑代码"
    ]
  },
  "demo_precondition": {
    "issue": "API 与 Worker 现已停止（8000 端口无监听）",
    "must_do": "演示前按 S-7 重启 API + Worker，否则前端问答直接连不上"
  }
}