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subagent: inherit parent sandbox/approval overrides in in-process children

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Per-session policy overrides (sandbox/mode, approval/policy) never crossed
the delegation boundary: a spawn child of a read-only-switched parent ran
under the wider deployment default, and a fork child missed any switch made
after its seed boundary — delegation was a bypass channel for a user's
tightening.

The in-process driver now snapshots the delegating parent's override chain
and stamps it onto the child through the canonical write paths
(SandboxPolicyService.inheritOverride / ApprovalService.inheritOverride),
anchored inside the child's first turn via a one-shot agent/prompt-submit
listener: turn-enclosed (durable), ahead of the first request (an inherited
'never' reaches the child's first system prompt), and positioned after any
stale fork-seed switch so the ordinary last-event-wins fold resolves it.
Only overrides are copied — an unswitched parent stamps nothing and the
child follows the live deployment default; both services are consumed
opportunistically, so compositions without them delegate unchanged. Nesting
composes by construction (each stamp folds the already-stamped parent log).

Evidence: inheritance.spec.ts drives scripted-model children into the real
dsh-fs-sandbox fence through the real write tool (disk-state + denial-marker
assertions; spawn, stale-seed fork, grandchild, escalation fail-closed, and
no-stamp guards), inheritOverride contract tests in both service suites, and
the recorded subagent-sandbox-inheritance ACP snapshot (read-only preset →
delegate → child denied, replayed keylessly).

See .agents/notes/implemented/feature/2026-07-25-subagent-policy-inheritance.md.
This commit is contained in:
kingwl
2026-07-25 04:06:19 +08:00
parent 690c53dc03
commit 669771097d
29 changed files with 2168 additions and 7 deletions
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pnpm-lock.yaml generated
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@@ -3138,12 +3138,18 @@ importers:
'@deepseek-ai/dsh-agent-loop-testkit':
specifier: workspace:^
version: link:../../support/agent-loop-testkit
'@deepseek-ai/dsh-fs-sandbox':
specifier: workspace:^
version: link:../../fs/fs-sandbox
'@deepseek-ai/dsh-invariants':
specifier: workspace:^
version: link:../../support/invariants
'@deepseek-ai/dsh-llm':
specifier: workspace:^
version: link:../../llm/llm
'@deepseek-ai/dsh-sandbox-policy':
specifier: workspace:^
version: link:../../sandbox/sandbox-policy
'@deepseek-ai/dsh-session':
specifier: workspace:^
version: link:../../core/session
@@ -3153,9 +3159,15 @@ importers:
'@deepseek-ai/dsh-system-prompt':
specifier: workspace:^
version: link:../../core/system-prompt
'@deepseek-ai/dsh-tool-fs':
specifier: workspace:^
version: link:../../fs/tool-fs
'@deepseek-ai/dsh-tools':
specifier: workspace:^
version: link:../../core/tools
'@deepseek-ai/dsh-user-approval':
specifier: workspace:^
version: link:../../ui/user-approval
cordis:
specifier: ^4.0.0-rc.7
version: 4.0.0-rc.7(@cordisjs/plugin-include@1.0.4)(@cordisjs/plugin-loader@1.0.0-rc.5)