Bound terminal RPC deadlines and localize Cloud timeout recovery - #16065
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ChangesTerminal RPC timeout handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant cmuxRpc
participant transcriptAdapter
participant foldEvent
cmuxRpc->>transcriptAdapter: Return unsuccessful result with errorCode timeout
transcriptAdapter->>foldEvent: Emit error event with terminal-rpc-timeout code
foldEvent->>foldEvent: Use localized terminalRequestTimeout text
Suggested reviewers: Merge Risk: 🟡 Moderate · up to RPC deadlines now return bounded, localized failures. However, a timed-out send may already have succeeded, so retry guidance should acknowledge unknown delivery before merge or be explicitly accepted. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change contains stalled terminal requests without adding new permissions. A timed-out send may already have been delivered, however, so safe retry behavior remains unverified. Retained concerns Security review detailsSecurity Blast Radius
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Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning)
✅ Passed checks (23 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 11.11% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 10 files. (1 skipped: 1 unsupported.) Full details: Cmux Full InternationalizationExplanation The PR adds four production keys to Resolution Add translated ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Merged main into fix/cloud-terminal-rpc-deadline and pushed the resolved head. The conflicts were in the CI guard workflow, the terminal transcript adapter, agent-chat package metadata and lockfile, the iOS simulator auth persistence test, the submodule forward-only guard and its tests, the test execution registry, and the CI workflow structure test. The CI workflow keeps main's fast-guard deduplication and all accumulated guard additions. The transcript adapter combines main's exception recovery with the branch's timeout-aware transcriptRpcErrorEvent, preserving prompt recovery and localized timeout diagnostics for send, interrupt, and focus. package.json keeps the React test renderer additions, and bun.lock was regenerated with bun install. The iOS test keeps both missing app identity coverage and the unresolvable simulator support directory fallback. The submodule guard keeps main's shallow-clone handling and both shallow ancestry tests. The registry and workflow structure files keep main's new entries and assertions. Verification from agent-chat: Conflict-focused verification also passed: PASS: reusable guard workflow structure; the submodule forward-only suite ran 15 tests and reported OK. |
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Inline comments:
Review comments at @agent-chat/adapters/transcript.ts:
- Line 594: Update the failed-send handling around `transcriptRpcErrorEvent` so
a timeout from `mobile.chat.send` is treated as an unknown delivery outcome, not
an unsent prompt. Reconcile the terminal transcript before offering a resend, or
use an error event that does not expose the prompt to the existing “Try again”
recovery path.
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Resources/Localizable.xcstringsagent-chat/adapters/transcript.tsagent-chat/cmux-rpc.tsagent-chat/server.tsagent-chat/src/i18n.tsagent-chat/src/session.tsagent-chat/test/cmux-rpc-deadline.test.tsagent-chat/test/fake-cmux-rpc.tsagent-chat/test/i18n.test.tsagent-chat/test/terminal-rpc-errors.test.tsagent-chat/types.ts
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Review: a subagent reviewed the diff independently, correctness first. Safe to land. One finding, already fixed, and four notes worth reading but not blocking. Fixed: the branch carried a 20,686-line reorder of What verified clean: the deadline wrapper races a timer against the RPC and rejects on whichever settles first, the timer is cleared on both the resolve and reject paths, and a late reply after a timeout cannot resolve an already-settled promise. Left, in rough order of how much they matter:
Fixed: the catalog reorder. Left: items 1 through 4, none blocking. Auto-merge goes on once the catch-up merge clears the — Raindrop g2 🫧 |
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Merged the current origin/main tip through 7bce471 into the terminal deadline branch and pushed merge commit ac34730. The earlier catch-up merge had conflicts in the agent-chat server and i18n modules. I kept main's queued startup and agent-message behavior and preserved the branch's bounded terminal RPC deadline handling, timeout error propagation, and localized recovery text. The current main-tip merge conflicted in Localizable.xcstrings. I kept main's catalog content and ordering, then restored the four branch keys: cloudTree.menu.renameTerminal, cloudTree.operation.clearTerminal, cloudTree.operation.renameTerminal, and cloudTree.renameTerminal.title. Verification: |
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Terminal focus, send, and interrupt requests can hang beyond their 10-second RPC timeout: the timer only sends SIGTERM, then still waits for process exit and both output pipes. Return a timeout failure independently of those waits, force-stop the spawned CLI, and cancel its owned stream readers. Late completion cannot change the returned result.
The timeout code flows through the shared transcript error adapter, preserving failed-send prompt recovery. Agent Chat displays translated retry guidance for that code in all 20 supported locales; ordinary CLI diagnostics retain their existing behavior.
Validation
From
agent-chat,bun run test/cmux-rpc-deadline.test.tsfails at41b43aad92261b53315e1348058426d8c9c51f42with “RPC deadline must return even when the CLI ignores termination or output pipes stay open” and passes at953efca947fb2f5901ec853da03acb04ed8ad49c.The regression executes real owned CLI subprocesses, advancing the existing 10-second deadline after each fixture becomes ready. It covers a SIGTERM-ignoring CLI and an exited parent whose child holds the pipes open, plus successful JSON/UTF-8, plain-text replies, and bounded nonzero-exit diagnostics. Fixture shutdown uses owned files and never connects to the user's control socket. Timeout cleanup targets the spawned CLI and its readers; it does not manage an arbitrary wrapper's descendant processes.
The error fixture exercises send, interrupt, and focus normalization, retains the failed prompt, and verifies the resulting error block in every Agent Chat locale. On the final commit:
bun run checkpasses TypeScript, 25 standalone scripts, and 44 Bun tests across 13 files.git diff --check 8e71daa1441f628eed1a242e9dd53ed105dccc57..HEADpasses.scripts/localize-changes --base 8e71daa1441f628eed1a242e9dd53ed105dccc57passes the strict unchanged macOS catalog check (10 catalogs, 9 locales).python3 scripts/verify-local.py --only xcstrings --only localizationpasses both selected checks.No live Cloud instance, native app, or browser UI was exercised.
Changelog
Fixed: Terminal control requests stop waiting at their RPC deadline and show translated timeout guidance in Agent Chat.
Summary by cubic
Binds terminal focus, send, and interrupt requests to their 10-second RPC deadline so they no longer hang when a spawned CLI ignores SIGTERM or keeps its output pipes open. On timeout the request fails immediately, the CLI is force-stopped, and its stream readers are cancelled, so late completion can't change the result.
Written for commit 23b9e1e. Summary will update on new commits.
Summary by CodeRabbit