deepseek-harness/.agents/notes/implemented/feature/2026-06-30-session-store-fork-api.zh.md
Tianyi Cui cd17f8d23a Merge refreshed docs/i18n-batch-cds-postmortem into docs/i18n-batch-rfc
# Conflicts:
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#	.agents/notes/implemented/architecture/2026-06-11-microkernel-event-taxonomy.i18n.yaml
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#	.agents/notes/implemented/architecture/2026-06-11-tool-schemas-in-prompt-assembly.i18n.yaml
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#	.agents/notes/implemented/architecture/2026-06-13-capability-seams.i18n.yaml
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#	.agents/notes/implemented/architecture/2026-06-30-bash-stdin-env-trusted-plugin-surface.i18n.yaml
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#	.agents/notes/implemented/architecture/2026-06-30-event-domain-semantics.i18n.yaml
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#	.agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.i18n.yaml
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#	.agents/notes/implemented/feature/2026-06-18-acp-terminal-and-tool-rendering.i18n.yaml
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#	.agents/notes/implemented/feature/2026-06-18-compaction-capability-seam.i18n.yaml
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#	.agents/notes/implemented/feature/2026-06-25-ask-user-question.i18n.yaml
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#	.agents/notes/implemented/feature/2026-06-29-todo-write-tool.i18n.yaml
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#	.agents/notes/implemented/feature/2026-06-30-hook-bridges.i18n.yaml
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2026-07-22 23:07:14 +08:00

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RFC: SessionStore fork API

Status: implemented

English | 中文

问题

事件溯源的会话日志已经具备 fork 所需的原语:创建一个带有种子事件前缀的新会话,然后像回放一样从该种子日志推导模型历史。这个原语有意保持底层:ctx.sessions.create(id, { seed, meta }) 接受任何合法种子,但常规的活跃会话分支需要围绕以下问题制定策略:哪些前缀可以被复制、子会话应打上哪些元数据、以及错误如何分类。

语义上的风险在于 fork 边界。一个合法的用户可见 fork 种子必须是连续的且封闭在轮次内。如果在一个活跃轮次内部 fork,会复制一个未关闭的 turn/start、可能还有一个未关闭的 step/start,以及可能悬空的工具调用。这违反了轮次封闭性与 provider-transcript 不变式,并且会创建一段误导性的子历史——看起来子会话参与了父会话中一个尚未完成的轮次。现有的 subagent seam 有意解决的是另一个问题:工具触发的 subagent fork 通常发生在父轮次仍然打开时,因此 dsh-subagent-fork 会将种子裁剪到父会话最后一个已完成轮次的前缀。通用的会话 fork 不应静默裁剪;它应当要么在请求的边界处 fork,要么拒绝请求。

决策

dsh-session 直接在 ctx.sessions 上拥有常规活跃会话 fork 的能力。不设独立的 dsh-session-fork 包(package),也不设 ctx.sessionFork 服务:该 API 没有独立的后端、事件词汇、生命周期或持久化行为,所有持久化工作都委托给现有的 session store 和持久化后端。

store 暴露一个操作:

type SessionForkSource = Session | SessionId

class SessionStore extends Service {
  fork(source: SessionForkSource, boundary?: number, childSessionId?: SessionId): Session
}

boundary 是要复制到的源事件 seq(含该序号)。省略时默认为源会话当前的最后一个事件;对空源会话省略 boundary 则创建一个空的子会话。fork 特有的校验仅检查请求的边界是否存在且为 turn/end。选定的前缀随后被深拷贝到子会话的种子中。子会话继承源会话的 cwd,将 parentSession 设为源会话 id,并将 seedLength 设为已复制前缀的长度。省略 childSessionId 时,SessionStore 使用其现有的 id 策略生成一个。

空前缀可以被 fork;任何非空边界都必须是一个安全的、已存在的、位于 turn/end 的序号,无论结束原因为何。类型化的错误区分源缺失、对象陈旧、子 id 重复和边界无效等情况。更广泛的日志校验与崩溃恢复仍由其现有的负责方处理。

曾考虑的替代方案

独立的 ctx.sessionFork 服务。 这是最初的实现,但评审表明它过度套用了 capability-seam 模式。代码没有可替换的后端、没有额外的事件面、没有独立的所有权生命周期,也没有超出 ctx.sessions.create({ seed, meta }) 的持久化行为。保留独立包会迫使调用方为了在 session store 原语之上执行一层策略而去发现并安装第二个服务。

两个函数:snapshot() 加 fork()。 这保留了一个可复用的种子/元数据计算,但唯一支持的消费方会立即创建会话。它还使接口看起来比用户实际需要的具体操作更抽象。单一的 fork() 加显式 boundary 使 API 保持直接,同时仍支持对先前时间点的 fork。

静默裁剪未关闭轮次到最后一个已完成边界。 这对 dsh-subagent-fork 是正确的——委托通常在父轮次仍然打开时开始,子会话应只继承已完成的前缀。但对常规的用户/会话分支而言是错误的,因为它隐藏了请求的 fork 点实际上不是合法边界这一事实,并且静默丢弃了父轮次的尾部。

后果

公开接口保持精简且易于发现:活跃会话分支是 ctx.sessions 的一部分,紧邻 create({ seed }),而非一个独立服务或一对两步辅助函数。持久化继续通过现有的 session/created 和 session/flush 行为运作:fork 出的子会话以种子事件开始生命,因此现有后端只需持久化该种子一次,并在 header 中保存 parentSession/seedLength。

v1 范围仍然排除 ACP(Agent Client Protocol) session/fork、对未加载的已持久化会话的 fork、面向模型的工具,以及 subagent 重构。如果未来添加 ACP 方法,应在具备 transcript(文本记录)/快照覆盖后才广播该能力;本 RFC 不添加面向编辑器的更新,因此当前不需要 ACP 快照。fork 子会话的回放仍由现有的种子边界测试 RFC 覆盖,而本 API 则获得专门的 dsh-session 单元测试加 JSONL 持久化覆盖。