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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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packages/subagent/subagent-inprocess/README.md
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@@ -20,7 +20,7 @@ The child gets the parent's working-directory/session lineage and inherits the p
This result boundary is valid because the provider owns an isolated child lifecycle from publication through quiescence. Steering submitted during that lifecycle belongs to the child run; the provider does not pretend the initial follow-up alone owns its output.
When the optional sandbox-policy or approval service is composed, the driver snapshots the parent's explicit session override before child creation and appends a source-tagged event during unpublished setup, after any fork history and before session publication. It never copies deployment defaults or one-shot grants; later child switches still win. See the [policy-inheritance decision](../../../.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md).
The driver applies the seam's [delegated policy inheritance](../subagent/README.md#delegated-policy-inheritance) through the shared child-agent helpers: it captures the parent's explicit sandbox/approval overrides before child creation and appends the source-tagged events during unpublished setup, after any fork history and before session publication. See the [policy-inheritance decision](../../../.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md).
## Cancellation and ownership