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feat(subagent): durable child catalog and list_agents

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Implements the durable-subagent-catalog RFC: SubagentControlService.listChildren()
enumerates a parent's direct continuable children from one sessionQuery trace,
validates each child's sole subagent/descriptor event (now carrying the durable
creation label), and returns one ordered SubagentListEntry[] with per-child
corrupt/unsupported/unavailable diagnostics. The list_agents tool ships as a
separately loadable plugin of dsh-tool-subagent-control requiring sessionQuery
at load; send_message stays usable without it.
This commit is contained in:
Dudu-0223
2026-07-26 02:32:34 +08:00
committed by Tianyi Cui
parent c7acc8fc6c
commit 4240c7dd7b
55 changed files with 1128 additions and 94 deletions
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docs/core-data-structures/subagent.i18n.yaml
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
# after editing either side, bring the other along and re-record with:
# pnpm run verify-translation-pairing --write docs/core-data-structures/subagent.md
subagent.md: 379bc9fdd5ff14f9d516d3ddcf37a353f5318026
subagent.zh.md: 3cd43deadba095e67e6a0dd3b483ea676206fbbf
subagent.md: ae0d84af09e65bf284780722bab02282fd6c3f37
subagent.zh.md: 9d2ba038885110a52cc3c7153cc908b05ea8b15f

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docs/core-data-structures/subagent.md
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}
```
The descriptor (`SubagentDescriptorData` in [descriptor.ts](../../packages/subagent/subagent/src/descriptor.ts)) snapshots explicit fields — provider name, resolved child `agentOptions.provider`/`model`, optional `persona`/`toolFilter` — never the merge-extensible `AgentOptions` object, so an unrelated extension value cannot break continuation and a later composition input is a deliberate version change. It omits `subagentDepth` (cold resume trusts the persisted header's `delegationDepth` as the monotone floor) and `outputSchema` (a one-shot result contract, not durable composition). The continuation manager appends the model-hidden `subagent/descriptor` event after any provider-supplied lineage and before the initial prompt is admitted; `header.seedLength` remains the fork-lineage boundary, so descriptor lookup reads the child's own suffix. The event is log-only: no `surfaceOp`, never in model history, and retained across compaction by the append-only log.
The descriptor (`SubagentDescriptorData` in [descriptor.ts](../../packages/subagent/subagent/src/descriptor.ts)) snapshots explicit fields — provider name, the delegation `description` as the durable creation `label`, resolved child `agentOptions.provider`/`model`, optional `persona`/`toolFilter` — never the merge-extensible `AgentOptions` object, so an unrelated extension value cannot break continuation and a later composition input is a deliberate version change. It omits `subagentDepth` (cold resume trusts the persisted header's `delegationDepth` as the monotone floor) and `outputSchema` (a one-shot result contract, not durable composition). The continuation manager appends the model-hidden `subagent/descriptor` event after any provider-supplied lineage and before the initial prompt is admitted; `header.seedLength` remains the fork-lineage boundary, so descriptor lookup reads the child's own suffix. The event is log-only: no `surfaceOp`, never in model history, and retained across compaction by the append-only log.
## Durable enumeration: `listChildren()` and `SubagentListEntry`
`SubagentService.listChildren(parentSessionId)` enumerates the parent's direct continuable children from one `ctx.sessionQuery.traceSession()` observation, without loading or resuming any Agent. Session lineage is broader than subagent identity — ordinary forks and one-shot children share `parentSession` — so exactly one supported `subagent/descriptor` event in the child's own suffix (after `seedLength`, so a fork seed cannot leak an ancestor's descriptor) is the sole subagent discriminator. The result is one `SubagentListEntry[]` in the trace's `createdAt`-then-id candidate order: a valid descriptor yields a `child` entry whose `status` snapshots the logical record (`running` = live in `ctx.sessions`, `complete` = persisted only, resumable by `send_message`); a per-child inspection failure yields a `diagnostic` entry (`corrupt`, `unsupported`, or `unavailable`) so one damaged sibling cannot hide healthy children; a missing descriptor yields no entry. A failure while building the initial trace fails the whole call — per-child isolation begins only after a trustworthy candidate set exists. The service keeps `sessionQuery` optional for by-id continuation: `listChildren()` throws `SUBAGENT_CONTROL_SESSION_QUERY_UNAVAILABLE` when it is absent, while the model-facing `list_agents` adapter (the separately loadable `/list-agents` plugin of [dsh-tool-subagent-control](../../packages/subagent/tool-subagent-control)) requires the service at plugin load. Listing does not consult the continuation manager's Activation map or provider availability; `send_message` remains the authoritative delivery-time operation, and a listed `running` child may still reject delivery as an ownership conflict.
## The terminal result: `SubagentResult`

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}
```
描述符（[descriptor.ts](../../packages/subagent/subagent/src/descriptor.ts) 中的 `SubagentDescriptorData`）会对显式字段建立快照——提供方名称、已解析的子 agent `agentOptions.provider`/`model`、可选的 `persona`/`toolFilter`——绝不会对可合并扩展的 `AgentOptions` 对象建立快照，因此无关的扩展值不会破坏继续执行，后续新增组合配置输入则是一次有意的版本更改。它省略 `subagentDepth`（冷恢复以持久化 header 中的 `delegationDepth` 作为单调下界）和 `outputSchema`（单次结果契约，而非持久化组合配置）。继续执行管理器会在任何提供方提供的谱系之后、初始 prompt 获准之前，追加对模型隐藏的 `subagent/descriptor` 事件；`header.seedLength` 仍是 fork 谱系边界，因此描述符查找会读取子 agent 自身的后缀。该事件只进入日志：不含 `surfaceOp`，绝不进入模型历史，并由仅追加日志跨压缩保留。
描述符（[descriptor.ts](../../packages/subagent/subagent/src/descriptor.ts) 中的 `SubagentDescriptorData`）会对显式字段建立快照——提供方名称、作为持久化创建 `label` 的委派 `description`、已解析的子 agent `agentOptions.provider`/`model`、可选的 `persona`/`toolFilter`——绝不会对可合并扩展的 `AgentOptions` 对象建立快照，因此无关的扩展值不会破坏继续执行，后续新增组合配置输入则是一次有意的版本更改。它省略 `subagentDepth`（冷恢复以持久化 header 中的 `delegationDepth` 作为单调下界）和 `outputSchema`（单次结果契约，而非持久化组合配置）。继续执行管理器会在任何提供方提供的谱系之后、初始 prompt 获准之前，追加对模型隐藏的 `subagent/descriptor` 事件；`header.seedLength` 仍是 fork 谱系边界，因此描述符查找会读取子 agent 自身的后缀。该事件只进入日志：不含 `surfaceOp`，绝不进入模型历史，并由仅追加日志跨压缩保留。
## 持久化枚举：`listChildren()` 与 `SubagentListEntry`
`SubagentService.listChildren(parentSessionId)` 从一次 `ctx.sessionQuery.traceSession()` 观测中枚举 parent 的直接可继续 child，而不会加载或恢复任何 Agent。会话谱系的范围比 subagent 身份更广——普通 fork 和一次性 child 都会共享 `parentSession`——因此，child 自身后缀中恰好一个受支持的 `subagent/descriptor` 事件（位于 `seedLength` 之后，避免 fork seed 泄漏祖先描述符）是唯一的 subagent 判别信息。结果是一个按追踪结果中 `createdAt`、再按 id 排列候选顺序的 `SubagentListEntry[]`：有效描述符生成 `child` 条目，其 `status` 是逻辑记录的快照（`running` 表示在 `ctx.sessions` 中存活，`complete` 表示只存在于持久化存储中并可由 `send_message` 恢复）；逐 child 检查失败生成 `diagnostic` 条目（`corrupt`、`unsupported` 或 `unavailable`），因此一个损坏的 sibling 不会隐藏健康 child；缺少描述符则不生成条目。构建初始追踪时的失败会让整个调用失败——只有得到可信候选集后才开始逐 child 隔离。服务将 `sessionQuery` 保持为按 id 继续执行时的可选依赖：缺少该服务时，`listChildren()` 抛出 `SUBAGENT_CONTROL_SESSION_QUERY_UNAVAILABLE`，而面向模型的 `list_agents` 适配器（[dsh-tool-subagent-control](../../packages/subagent/tool-subagent-control) 中可单独加载的 `/list-agents` 插件）会在插件加载时要求该服务。枚举不会查询继续执行管理器的 Activation map 或提供方可用性；`send_message` 仍是消息送达时的权威操作，列表中的 `running` child 仍可能因所有权冲突而拒绝投递。
## 终态结果：`SubagentResult`