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fix(subagent): inherit parent policy overrides in continuable children

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A continuable background child (the default backgroundMode for both
delegation tools) never received the parent session's explicit
sandbox/approval overrides: materialization applied only child
composition, so a danger-full-access parent produced workspace-write
children whose every out-of-workspace operation raised an approval
prompt.

Move the one-shot driver's capture/append pair into the shared
child-agent module (captureDelegatedPolicyOverrides /
appendDelegatedPolicyOverrides) and call it from both paths:
startContinuable captures before its first await, only fresh
materialization appends the source-tagged events (after any fork seed),
and a cold resume replays the persisted delegation events instead of
re-capturing the parent.

Adds the continuable inheritance unit suite, the ACP snapshot scenario
subagent-continuable-inheritance (fails without the fix), the
continuable policy-inheritance Agent Note, and the seam-level README
contract, with bilingual counterparts.

Fixes #1692
This commit is contained in:
Hypatia May
2026-08-10 12:16:19 +08:00
parent abaf8f5061
commit 64e0fbfd6d
36 changed files with 1106 additions and 61 deletions
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10
docs/subsystems/subagent.zh.md
View File

@@ -615,7 +615,7 @@ async start(name: string, request: SubagentStartRequest): Promise<SubagentRun>
Types: [Agent](core.md) · [ContentBlock](llm-streaming.md) · [MessageId](llm-streaming.md) · [SessionId](core.md)
Source: [`packages/subagent/subagent/src/index.ts:167`](../../packages/subagent/subagent/src/index.ts)
Source: [`packages/subagent/subagent/src/index.ts:169`](../../packages/subagent/subagent/src/index.ts)
<a id="subagent-events"></a>
@@ -641,7 +641,7 @@ A published child settled. Scope-filtered dispatch uses the same delegating pare
Types: [Scoped](scope.md)
Source: [`packages/subagent/subagent/src/index.ts:162`](../../packages/subagent/subagent/src/index.ts)
Source: [`packages/subagent/subagent/src/index.ts:164`](../../packages/subagent/subagent/src/index.ts)
<a id="subagentprovider-added--emit"></a>
@@ -658,7 +658,7 @@ A provider became resolvable in the registry.
'subagent/provider-added'(provider: SubagentProvider): void
```
Source: [`packages/subagent/subagent/src/index.ts:136`](../../packages/subagent/subagent/src/index.ts)
Source: [`packages/subagent/subagent/src/index.ts:138`](../../packages/subagent/subagent/src/index.ts)
<a id="subagentprovider-removed--emit"></a>
@@ -675,7 +675,7 @@ A provider left the registry. Accepted runs remain holder-owned.
'subagent/provider-removed'(name: string): void
```
Source: [`packages/subagent/subagent/src/index.ts:142`](../../packages/subagent/subagent/src/index.ts)
Source: [`packages/subagent/subagent/src/index.ts:144`](../../packages/subagent/subagent/src/index.ts)
<a id="subagentstart--emit"></a>
@@ -699,5 +699,5 @@ A provider established a published child. For in-process providers, `ctx.agents.
Types: [Scoped](scope.md)
Source: [`packages/subagent/subagent/src/index.ts:153`](../../packages/subagent/subagent/src/index.ts)
Source: [`packages/subagent/subagent/src/index.ts:155`](../../packages/subagent/subagent/src/index.ts)
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