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meida_backend/packages/agent/README.md
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xsl 7c67506474 feat(domains): identity, billing, task services and domain placeholders
Billing implements reserve -> commit -> refund against bl_quota and bl_ledger
with row-level locking and idempotency keys; the refund commits on its own
transaction so a failed request cannot silently keep a user's quota. Task
implements the unified task centre over the state machine. Identity issues and
resolves users. Remaining domains are placeholders whose READMEs state what
belongs there and what must not.
2026-08-14 00:26:39 +08:00

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# `packages/agent/` — 穿搭 Agent
**职责**(架构 §4.1):会话管理、意图识别、上下文组装、生成编排。
**不负责**:知识检索实现(调 `packages/retrieval`)。
## 已实现
只有 `service.py` 里那条最小编排:配额预扣 → LLM 网关 → 成本落库 →
提交或退还。这是**垂直切片**,用来证明地基通了,不是 Agent 功能。
## 架构 §7.2 的完整链路(九步,目前只做了第 5 步)
| 步骤 | 状态 |
| --- | --- |
| ① 输入审核(TMS + 备案关键词库),fail-close | ❌ CR-06 |
| ② 意图识别(含越界:医疗、身材评判) | ❌ FR-AGT-02 |
| ③ 上下文组装(token 预算严格分配) | 部分:只有固定前缀 + 当前输入 |
| ④ 混合检索 | ❌ FR-AGT-04 |
| ⑤ LLM 生成(流式 SSE) | 部分:非流式 |
| ⑥ 生成后校验(禁忌违反 = 0、色值在板内) | ❌ FR-AGT-05 |
| ⑦ 输出审核 | ❌ CR-06 |
| ⑧ 落库 message + retrieval_trace + rule_hits + 成本 | 部分:只有成本 |
| ⑨ 异步偏好抽取 → 写 L2 记忆 | ❌ FR-MEM-03 |
表 `ag_conversation` / `ag_message` / `ag_feedback` 尚未创建。
## Token 预算(架构 §7.2,必须硬性限制)
| 部分 | 预算 |
| --- | --- |
| 系统提示词(固定前缀,放最前以命中缓存) | ≤ 800 |
| 画像摘要 | ≤ 500 |
| 会话摘要 | ≤ 400 |
| 检索知识 | ≤ 1500 |
| 用户当前输入 | ≤ 500 |
| **输入合计** | **≤ 3700** |
| 输出 | ≤ 800 |
超预算时**按优先级裁剪而不是报错**(FR-AGT-03)。
## Prompt 注入防护(NFR-SEC-04)
用户输入与系统提示词严格分区;输出侧校验;**禁止用户内容影响工具调用决策**。