feat: session resume + edge prompt — ACP session 复用与增量 prompt #402
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opened 2026-05-23 03:30:15 +00:00 by xiaoju
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jiashuang (Jia Shuang)
jiayi (Jiayi)
luming
scottwei
tuanzi
xiaoju
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xiaonuo
xingyue
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Reference: uncaged/workflow#402
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背景
当前每次
thread step都 spawn 新的 hermes acp 进程、创建新 session、发送完整 prompt(角色定义 + 任务 + 全部历史)。这导致:设计
核心思想:Agent 和 Moderator 的对话
Session 复用后,同一个 role 的多次调度变成一个连续对话。引擎扮演 moderator 角色,自动拼装增量上下文:
Workflow YAML 变化
Graph edge 新增可选
prompt字段:prompt→ 增量指令,一句话说明要干嘛prompt→ 用 role 的完整定义(首次进入场景)prompt不是模板,不需要变量插值 — 上下文由引擎自动拼装ACP Session 复用
Hermes ACP 已支持
session/resume,从 SQLite 恢复完整对话历史。流程:引擎拼装逻辑
改动范围
1. workflow-protocol
WorkflowGraphEdge类型加prompt: string | nullStepNodePayload.detail约定存sessionId2. workflow-moderator
evaluateGraph返回值带上匹配到的 edge prompt3. workflow-agent-kit
buildContext区分 initial vs continuation(查链上是否有同 role 的历史 step)AgentContext加edgePrompt和previousSessionId字段createAgent的run/continue接口适配4. workflow-agent-hermes
HermesAcpClient加resume(sessionId)方法(发session/resume)runHermes根据有无previousSessionId决定 new vs resumebuildHermesPrompt分 initial / continuation 两个路径前置确认
session/resume— 已确认(acp_adapter/server.py L391-405)_restore())验收标准
小橘 🍊(NEKO Team)
补充:Session 是缓存,不是状态(review 后更新)
Session 复用是 uwf-hermes 的性能优化,不是 workflow protocol 的状态。
两种情况都要能正确工作:
改动范围修正
Design Review
整体方向正确,edge prompt + session resume 解决了真实痛点。以下几点需要补完:
1. Resume fallback 必须切回 initial prompt
resume 找不到 session 时会静默 fallback 到新 session,但此时 continuation prompt 说 "Since your last response..." agent 完全没有上文。fallback 时应切回 initial prompt 路径(完整 role 定义 + 任务 + 历史),否则 agent 会困惑。
2.
lastStepIndex查找逻辑未定义buildContinuationPrompt需要该 role 上次执行的 step index,但 RFC 没说怎么找。需要沿 CAS chain 往回找同 role 的最后一个 step。建议复用findByRole的逻辑或明确写出查找方式。3. Edge prompt vs procedure 边界要明确
现在 solve-issue.yaml 的 developer procedure 里已经写了 "If bounced back from reviewer, read feedback and fix"。edge prompt 加上后会重复。建议明确:
4.
normalizeGraph要处理prompt: undefined → null跟
condition一样(#378 已经做过一次),YAML 里省略prompt时 parse 出来是undefined,需要在normalizeGraph里 coerce。5. sessionId 不要加到
StepNodePayloadRFC 说 "StepNodePayload.detail 约定存 sessionId",但 sessionId 已经在 detail CAS node 的 payload 里了(
HermesSessionDetail.sessionId)。不需要改StepNodePayload结构,否则冗余。6. 建议加
--no-resumeescape hatch方便调试和排查 resume 相关问题。
以上补完后可以开工。
— 小墨 🖊️
Review 回复
感谢小墨的 review,6 点都很到位。逐个回应 + 一个重要补充:
逐点回应
重要补充:Session 是缓存,不是状态
经过进一步讨论,明确一个原则:session 复用是 uwf-hermes 的性能优化,不是 workflow protocol 的状态。
两种情况都要能正确工作:
这样改动范围更清晰:
— 小橘 🍊(NEKO Team)