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fix(subagent): pin delegated child approvals to 'never' within the inherited sandbox scope

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A delegated in-process child now acts only within the sandbox scope fixed
at delegation: captureDelegatedPolicyOverrides still snapshots the parent's
explicit sandbox override but pins the child approval policy to 'never'
(instead of inheriting the parent's), so every child ask — sandbox_permissions
escalations included — is rejected deterministically by ApprovalService
before any answerer, with the audit pair still logged. Every in-process
child additionally receives the scoped subagent:delegation runtime-context
statement telling it to report a scope limitation instead of retrying.

Supersedes the approval half of the policy-inheritance decision (new Agent
Note cross-linked from both prior notes and the approval-seam Q&A); refreshed
child snapshot fixtures carry the pinned event, and
subagent-published-run-failure now persists a one-event child log.
This commit is contained in:
Hypatia May
2026-08-10 19:17:37 +08:00
parent 1ac58714d1
commit 501c3a8ab6
61 changed files with 781 additions and 550 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.
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the parent's explicit sandbox/approval overrides before child creation and appends the source-tagged events during unpublished setup, after any fork history and before session publication.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).
The driver applies the seam's [delegated policy](../subagent/README.md#delegated-policy) through the shared child-agent helpers: it captures the parent's explicit sandbox override and the `'never'` approval pin before child creation and appends the source-tagged events during unpublished setup, after any fork history and before session publication. See the [delegation-policy decision](../../../.agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md).
## Cancellation and ownership