fix(acp): publish sub-run sessions loaded over ACP as view-only - #1078
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session/load registered a fully promptable session for any session kind, including the child, side and spec sub-runs that every other resume path refuses through sessions.IsResumableKind: the TUI, exec sessions, the exec CLI, and ACP's own session/resume. So a sub-run could be opened and continued as a standalone conversation through ACP and nowhere else, with whatever its parent run relied on about that sub-run's lifecycle no longer true. Load has a real render-only use, a client rebuilding a transcript it can scroll, so it still loads those sessions and still replays their history. What changes is that the session it publishes for a non-resumable kind is marked read-only, and session/prompt refuses it with an invalid-params error that says why. runTurn is reached only from session/prompt, so that one gate covers every way a turn can run; set_mode and the config options only change settings. The flag is decided at first registration and never changes. Resume refuses a non-resumable kind before it registers anything, and session/new always creates a standalone session, so the only path that can publish one of these ids is load, which now publishes it read-only. TestACPResumeAppliesStandaloneSessionKindPolicy claimed "session/load should retain render-only access", but its prompt check ran before the load, so it only proved the refused resume never registered the session. It now prompts after the load as well. TestACPLoadPublishesSubRunsReadOnly checks every kind in both directions, so a gate that refused everything would fail on the resumable kinds, with a setup guard that the table agrees with IsResumableKind. Fixes #1045
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Included review availability: 2 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. WalkthroughACP loads non-resumable session kinds as read-only. Clients can load their transcripts, but prompts are rejected with invalid-params. New sessions and resumable persisted sessions remain writable. ChangesACP session loading
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to Loaded sub-run transcripts remain viewable without making those sessions promptable, and the updated tests distinguish this behavior from unrelated prompt failures. No actionable merge risk remains in the reviewed changes. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@internal/acp/agent_test.go`:
- Around line 1314-1316: Update the prompt-result assertions around refused and
tc.readOnly: require err == nil for resumable regular and fork sessions, and for
read-only sessions assert the expected rpcError code rather than inspecting
error-message text. Ensure a failed writable prompt cannot pass as not refused.
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internal/acp/agent.gointernal/acp/agent_test.go
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…t merely unrefused TestACPLoadPublishesSubRunsReadOnly decided the outcome from the error text: "refused as view-only" was false for any error other than the view-only one, so a regular or fork session whose prompt failed for some other reason still passed. With every writable prompt made to fail with an internal error, the old test stayed green. Raised by CodeRabbit on the PR. Resumable sessions now have to prompt successfully. For the sub-run kinds the decision is the RPC code, and the message is checked only to tell the view-only refusal apart from other invalid-params errors such as an unknown session id.
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Right, and it was a real hole rather than a style point. I made every writable prompt fail with an internal error and ran the test as it stood: it stayed green, because "not refused as view-only" is satisfied by any other failure. So the half of the test meant to show regular and fork sessions still work after load wasn't showing it. Fixed in 71b1896. Resumable sessions now have to prompt successfully ( For the sub-run kinds, whether the prompt was refused is now decided by the RPC code. The message is still checked, but only to tell the view-only refusal apart from other invalid-params errors, such as an unknown session id, that share the code. |
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View-only is enforced at the right place: readOnly set once at registration for non-resumable session kinds, session/prompt refusing with invalid params, the resume path still refusing outright, and the test asserts both directions.
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Fixes #1045
session/loadregistered a fully promptable session for any session kind, including the child, side and spec sub-runs that every other resume path refuses throughsessions.IsResumableKind: the TUI, exec sessions, the exec CLI, and ACP's ownsession/resume. So through ACP, and nowhere else, a sub-run could be opened and continued as if it were a standalone conversation, with whatever its parent run relied on about that sub-run's lifecycle no longer true.What changed
Load still loads those sessions and still replays their history. That render-only use is real: a client rebuilding a transcript it can scroll should be able to read a sub-run. What changes is that the session load publishes for a non-resumable kind is marked read-only, and
session/promptrefuses it:runTurnis reached only fromsession/prompt, so that single gate covers every way a turn can run.session/set_modeand the config options only change settings on a session that can no longer run, so they're left alone.The flag is decided when the session is first registered and never changes. Resume refuses a non-resumable kind before it registers anything, and
session/newalways creates a standalone session, so load is the only path that can publish one of these ids, and it now publishes it read-only.Why not just refuse load
That was the other option the issue raised. It would make ACP agree with the other resume paths, but it would also take away transcript rendering for sub-runs, which nothing else offers over ACP. View-only keeps that and closes the part that was actually wrong.
Tests
TestACPResumeAppliesStandaloneSessionKindPolicyclaimed "session/load should retain render-only access", but its prompt check ran before the load, so it only showed that the refused resume never registered the session. It now prompts after the load too, which is the call that mattered.TestACPLoadPublishesSubRunsReadOnlyloads every kind and prompts it, checking both directions: the four sub-run kinds must be refused as view-only, and regular and fork sessions must not be. A setup guard checks the table still agrees withIsResumableKind, so the cases can't quietly stop meaning what they say.Falsification, each mutation run against both tests:
Verification
gofmt,go vet ./...,go test -race ./internal/acp/,go run ./cmd/zero-release buildandsmokeon windows/amd64.go test ./...is 86 packages clean with one failure,internal/configTestResolveReportsExplicitMaxTurns, which fails the same way on unmodifiedmainat 99721c7 and is what #1072 fixes.This touches
internal/acp/agent.go, as does #886, in different functions (registerSession,handleSessionPromptand the load path here; tool-result events and replay there). A trial merge of the two heads (daf9b8c6and this one) is clean.Summary by CodeRabbit