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Session Branch — DSH Plugin for DeepSeek Harness
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@morlay/session-branch

Session Branch

Provider abstraction + high-level service for rewind / retry / fork over DeepSeek Harness event-sourced sessions.

The plugin will be installed here. Keep web if you are unsure.

npx -y @deepseek-ai/dsh plugin --profile web add @morlay/session-branch@0.0.8
READMECompatibilityVersions

Compatibility and provenance

Session Branch is published as @morlay/session-branch and currently resolves to version 0.0.8. The Hub verifies its manifest and preserves the exact installation source for reproducible installs.

DSH compatibility
*
Runtime surfaces
any
Release source
npm
Registry updated
9/20/2026

Versions

0.0.8stable
9/14/2026
0.0.7stable
9/13/2026
0.0.6stable
9/11/2026
Show 16 more versionsCollapse versions
0.0.10-alpha.4prerelease
9/20/2026
0.0.10-alpha.3prerelease
9/18/2026
0.0.10-alpha.2prerelease
9/18/2026
0.0.9-alpha.1prerelease
9/18/2026
0.0.9-alpha.0prerelease
9/18/2026
0.0.5stable
9/10/2026
0.0.4stable
9/10/2026
0.0.4-alpha.4prerelease
9/10/2026
0.0.4-alpha.2prerelease
9/8/2026
0.0.4-alpha.1prerelease
9/8/2026
0.0.4-alpha.0prerelease
9/8/2026
0.0.3stable
9/4/2026
0.0.2stable
9/3/2026
0.0.11stable
8/27/2026
0.0.10stable
8/20/2026
0.0.9stable
8/20/2026

Related plugins

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Latest
0.0.8
DSH
*
HMR
Process restart
Tree shaking
Safe tree shaking not declared
Unpacked size
24.6 kB
Files
15
Surface
any
License
MIT
Source
npm
GitHub
★ 9
Weekly downloads
3,483
Security scan
✓ v0.0.8 scan passed
Last push
9/20/2026
View source ↗
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README

@morlay/session-branch

分支式会话编辑的契约层：定义数据层分支原语 SessionBranchProvider （rewind / forkFrom / readBranchPrefix）、高层服务 SessionBranch （ctx.sessionBranch）与共享的版本树投影 buildTimeline。

与上游 SessionHandle 的关系

上游持久化模型是 SessionHandle（append-only：create / open / append / flush / stat / list），没有显式回退原语；本包在其旁边定义分支面 provider，负责显式回退与闭合边界派生：

面上游 SessionHandle本包 SessionBranchProvider
覆盖持久读写（append-only）显式回退 + 闭合边界派生（分支面）
原语create / open / append / flushreadBranchPrefix / forkFrom / rewind
实现方JSONL / RDB 等RDB 等（@morlay/session-rdb 同时实现两者，形成闭环）

Provider 抽象

interface SessionBranchProvider {
  readonly name: string;
  readBranchPrefix(id, atSeq?, mode?, signal?): Promise<BranchBoundary>;
  forkFrom(sourceId, options?, signal?): Promise<SessionId>;
  rewind(id, toBoundary, signal?): Promise<SessionPersistenceSnapshot>;
}
  • readBranchPrefix：定位 atSeq 锚定的闭合 turn/end 边界并返回前缀； mode: "after"（包含目标轮，fork 语义）/ "before"（排除目标轮，编辑 / 重掷 / 重试语义）。
  • forkFrom：纯 append——新会话（parentSession / seedLength），seed = 边界前缀 + seedSuffix，不触碰源会话。
  • rewind：唯一的显式回退原语，事务整体提交或回滚；支持 live 会话 （内存 log 截断 + 派生缓存复位 + handle cursor / 继承前缀对齐，详见 @morlay/session-rdb 的 docs/branch.md）。

版本树

buildTimeline(snapshots, readOwnEvents, sessionId) 从会话快照（header lineage）+ 每会话自有后缀（seq >= seedLength 的 session-branch/version 事件）投影完整版本树。

版本效果事件携带 ignorable: true：非 branch 读者凭信封安全跳过，事件 本身原样落库——live 会话从内存 log 读到效果，cold 会话经读路径恢复效果 详情（见 ADR 0003）。