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5.3 KiB
Agent Note: 事件域语义——会话是事实日志,agent 是运行时表面
Status: implemented
English | 中文
问题
harness 通过 Cordis 事件分类体系扩展 agent loop(智能体循环)(见微内核事件分类体系 Agent Note)。随着该分类体系的增长,三个事件域之间的界限变得模糊:
session/*承载持久的、事件溯源的日志(SessionEventMap)。agent/*承载运行时实时信号,向插件传递Agent句柄。tools/*承载工具注册表与执行 seam。
两个问题促使我们固定语义。第一,若干轮次/步骤边界同时作为持久的 SessionEvent(turn/start、turn/end、step/start、step/end)和镜像的 agent/* emit(agent/turn-start、agent/turn-end、agent/step-start、agent/step-end)存在。消费方对同一事实有两个真源,每次生命周期变更都必须同时更新两处。第二,即将到来的钩子子系统需要一个连贯且有文档的订阅表面——插件作者(以及基于其上构建的 Claude Code / Codex 钩子桥接)必须在不阅读循环代码的情况下知道应该监听会话事件还是 agent 事件,以及原因。
这套词汇是拦截决策、持久的 hook/* 日志,以及 Claude Code 和 Codex 桥接的基础。
决策
三个域,各司其职,以一条边界规则统一。
session/*——持久的、可回放的事实日志。 拥有SessionEventMap;每条记录仅含 JSON(无活对象)。每次追加触发一次session/eventemit,加上session/flush并行持久性检查点。它同时也是实时 transcript(文本记录)源:想渲染或响应已发生事件的消费方在此订阅,因此实时渲染与回放投影共享同一路径。agent/*——运行时实时表面。 始终携带活的Agent。拦截 waterfall(瀑布式事件)(agent/pre-step、agent/request、agent/request-error)负责变换、拒绝或恢复;awaitedagent/turn-stopping观察停止边界;瞬态 emit 报告生命周期、状态、inbox 插入/领取/丢弃与错误。轮次和步骤边界不在此处——它们是持久的会话事件,从session/event读取;token 流(assistant/chunk)和中途 steering(以user/message呈现)同理。tools/*——工具注册表与执行 seam。
边界规则: 持久的、可回放的事实是 SessionEvent;实时拦截或瞬态/活对象信号是 agent/tools Cordis 事件。轮次或步骤边界是持久事实,因此存在于会话日志中并从 session/event 源读取——不会被镜像为 agent/* emit。
将规则应用于边界镜像: 全部四个边界镜像——agent/turn-start、agent/turn-end、agent/step-start、agent/step-end——被移除。没有生产消费方需要在边界处获取活的 Agent:ACP(Agent Client Protocol)桥接将其进行中的提示词与精确对应的 session/event turn/start/turn/end 事件对关联,其他 transcript 消费方同样从持久流派生边界。见移除边界镜像事件 Agent Note,该决策由它负责。移除 emit 也简化了循环的 closeStep/closeTurn(各只需一次 append,无需配对 emit)。
后果
- 循环不再 emit 任何边界镜像;
closeStep仅追加step/end,closeTurn仅追加turn/end。Session.append负责 post-commit observer 隔离,因此抛出异常的边界 observer 无法改变轮次结果或饿死后续消费方;事件接纳失败或内部校验失败仍会在边界进入日志之前向外抛出。 - 之前通过已移除 emit 观察边界的测试,现在观察持久的
turn/start/turn/end/step/start/step/end会话事件——它们所锁定的行为(边界顺序、步骤计数)不变;只是读取的源移到了规范源。那些测试抛出异常的轮次边界 emit 监听器的用例被删除,因为该代码路径不再存在(没有 emit 可供抛出)。按照 AGENTS.md「测试记录行为,而非黄金真相」,行为与其测试一同迁移(或一同消亡)。 - 循环仅在
append('step/start')返回后才标记步骤已打开(stepOpen = true)。内部分发校验在日志推入之前运行,可能在不打开步骤的情况下拒绝;post-commitsession/eventobserver 的失败被隔离在Session.append内部。因此该标记精确表示已提交的、欠一个后续step/end的边界。 - 完整实现见简化 Agent Note「停止将持久边界镜像为 agent 事件」:全部四个边界镜像被移除,所有消费方从
session/event读取边界。agent/steering(不是边界镜像)不在该 Agent Note 范围内,由其后续 Agent Note 移除agent/steering镜像 emit 单独移除——它镜像的是持久的中途 steeringuser/message。 - Cordis 事件目录(
docs/cordis-catalog/events.md)重新生成以移除镜像事件。