fix: send_to v2 background verify and Cursor queued_followup - #441
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…tcome Timeout-without-evidence now receipts pending_verify instead of a false terminal fail, which was driving duplicate deliveries. A background verifier records delivered or failed_confirmed, files a deduped evidence ticket on confirmed failure, and identical in-flight sends return duplicate_of. Co-Authored-By: cmuxlayerCursor-11c3aa25 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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| occurrence_count: 1, | ||
| occurrences: [ticket], | ||
| }; | ||
| writeFileSync(path, `${JSON.stringify(record, null, 2)}\n`, "utf8"); |
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🟡 Medium src/delivery-failure-tickets.ts:66
writeFileSync truncates the existing ticket before writing the replacement, so an interrupted or disk-full write leaves the authoritative record truncated or invalid; the next occurrence then throws in JSON.parse and cannot record further evidence. Write the record to a temporary file and atomically rename it over path instead.
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In file @src/delivery-failure-tickets.ts around line 66:
`writeFileSync` truncates the existing ticket before writing the replacement, so an interrupted or disk-full write leaves the authoritative record truncated or invalid; the next occurrence then throws in `JSON.parse` and cannot record further evidence. Write the record to a temporary file and atomically rename it over `path` instead.
| : Date.parse(receipt.created_at) + this.deliveryVerifyDeadlineMs; | ||
| let observation: DeliveryVerifyObservation = { outcome: "pending" }; | ||
| if (this.deliveryVerifier) { | ||
| try { |
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🟠 High src/agent-engine.ts:6394
runSweep() can hang forever when deliveryVerifier(receipt) never settles, because the deadline is checked only after the await completes; deliveryVerifyInFlight then stays set and lifecycle sweeps stop progressing. Race verification against the remaining deadline so an unresponsive verifier becomes failed_confirmed instead of blocking the sweep.
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In file @src/agent-engine.ts around line 6394:
`runSweep()` can hang forever when `deliveryVerifier(receipt)` never settles, because the deadline is checked only after the await completes; `deliveryVerifyInFlight` then stays set and lifecycle sweeps stop progressing. Race verification against the remaining deadline so an unresponsive verifier becomes `failed_confirmed` instead of blocking the sweep.
| }, | ||
| observed_at: new Date().toISOString(), | ||
| }; | ||
| const written = writeDeliveryFailureTicket(ticket, { |
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🟡 Medium src/agent-engine.ts:6461
verifyPendingDeliveries marks a receipt failed_confirmed before fileConfirmedFailureTicket writes the local ticket, so a ticket-directory or JSON I/O error leaves the terminal receipt without required evidence and prevents retries; the exception also aborts verification of later receipts. Make ticket creation failure-safe and retryable, or create the ticket before committing the receipt terminal.
Also found in 1 other location(s)
src/server.ts:6425
verifyPendingDeliveriespersists the receipt as terminal before awaitingfileConfirmedFailureTicket. If local ticket creation throws (for example, the ticket directory is unwritable), the sweep exits, and subsequent sweeps skip this now-terminal receipt, so its required failure ticket is permanently lost; later receipts in the same iteration are also deferred.
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In file @src/agent-engine.ts around line 6461:
`verifyPendingDeliveries` marks a receipt `failed_confirmed` before `fileConfirmedFailureTicket` writes the local ticket, so a ticket-directory or JSON I/O error leaves the terminal receipt without required evidence and prevents retries; the exception also aborts verification of later receipts. Make ticket creation failure-safe and retryable, or create the ticket before committing the receipt terminal.
Also found in 1 other location(s):
- src/server.ts:6425 -- `verifyPendingDeliveries` persists the receipt as terminal before awaiting `fileConfirmedFailureTicket`. If local ticket creation throws (for example, the ticket directory is unwritable), the sweep exits, and subsequent sweeps skip this now-terminal receipt, so its required failure ticket is permanently lost; later receipts in the same iteration are also deferred.
| ? { | ||
| ...existing, | ||
| occurrence_count: existing.occurrence_count + 1, | ||
| occurrences: [...existing.occurrences, ticket], |
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🟡 Medium src/delivery-failure-tickets.ts:58
writeDeliveryFailureTicket retains every occurrence and rewrites the complete history synchronously, so a recurring signature makes ${signature}.json grow without bound and eventually causes delivery-failure processing to stall or exhaust memory. Cap or rotate occurrences, or store new records append-only instead of copying, stringifying, and rewriting the full array on every failure.
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In file @src/delivery-failure-tickets.ts around line 58:
`writeDeliveryFailureTicket` retains every occurrence and rewrites the complete history synchronously, so a recurring signature makes `${signature}.json` grow without bound and eventually causes delivery-failure processing to stall or exhaust memory. Cap or rotate `occurrences`, or store new records append-only instead of copying, stringifying, and rewriting the full array on every failure.
| await this.drainDeliveryQueue(); | ||
| await this.verifyPendingDeliveries(); |
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🟠 High src/agent-engine.ts:6114
runSweep verifies deliveries immediately after draining them, so a newly created pending_verify receipt can be marked terminal submitted from the agent's pre-existing working/thinking screen even when the submitted text was never observed. That suppresses retries for a lost message; verify existing receipts before draining new ones (or otherwise defer verification until a later sweep).
- await this.drainDeliveryQueue();
- await this.verifyPendingDeliveries();
+ await this.verifyPendingDeliveries();
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In file @src/agent-engine.ts around lines 6114-6115:
`runSweep` verifies deliveries immediately after draining them, so a newly created `pending_verify` receipt can be marked terminal `submitted` from the agent's pre-existing `working`/`thinking` screen even when the submitted text was never observed. That suppresses retries for a lost message; verify existing receipts before draining new ones (or otherwise defer verification until a later sweep).
| } | ||
| } | ||
| const timedOut = Date.now() >= deadlineMs; | ||
| if (observation.outcome === "delivered") { |
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🟡 Medium src/agent-engine.ts:6404
A delivered observation received after verify_deadline_at still marks the receipt as terminal submitted, so delayed sweeps report success after the hard verification deadline. Because the delivered branch runs before the timeout branch, include timedOut in the success condition so expired receipts become failed_confirmed.
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In file @src/agent-engine.ts around line 6404:
A `delivered` observation received after `verify_deadline_at` still marks the receipt as terminal `submitted`, so delayed sweeps report success after the hard verification deadline. Because the delivered branch runs before the timeout branch, include `timedOut` in the success condition so expired receipts become `failed_confirmed`.
| what_fixed_it: | ||
| "Do not blind-retry. Identical send_to while pending_verify/queued returns duplicate_of. Query wait_for({delivery_id}) or list_agents detail=full.", | ||
| evidence: { | ||
| receipt, |
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🟠 High src/agent-engine.ts:6454
The default GitHub filer uploads receipt.text inside evidence, so confirmed delivery failures can exfiltrate credentials, proprietary code, or sensitive instructions. Construct evidence from non-sensitive receipt metadata instead of the complete receipt.
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In file @src/agent-engine.ts around line 6454:
The default GitHub filer uploads `receipt.text` inside `evidence`, so confirmed delivery failures can exfiltrate credentials, proprietary code, or sensitive instructions. Construct evidence from non-sensitive receipt metadata instead of the complete receipt.
| if (!agent) { | ||
| return { outcome: "failed_confirmed" as const, reason: "target_gone" }; | ||
| } | ||
| const snapshot = await readParsedSurface( |
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🟠 High src/server.ts:10799
The background delivery verifier reads agent.surface_id and agent.workspace_id directly from the registry record instead of resolving the current stable route via engine.resolveAgentIoRoute. If the UUID-backed surface has moved to a new mutable ref (or the old ref has been recycled to a different terminal) during the verification window, readParsedSurface inspects the wrong terminal. A cleared composer or working status on that unrelated terminal then causes the verifier to return outcome: "delivered", falsely marking the original delivery as submitted even though the text was never accepted by the target agent.
The deliverAgentInput function already resolves and validates the route before every mutation. Apply the same pattern here: call engine.resolveAgentIoRoute(receipt.agent_id) and use the resolved surface_id/workspace_id, falling back to outcome: "pending" if the route cannot be established.
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In file @src/server.ts around line 10799:
The background delivery verifier reads `agent.surface_id` and `agent.workspace_id` directly from the registry record instead of resolving the current stable route via `engine.resolveAgentIoRoute`. If the UUID-backed surface has moved to a new mutable ref (or the old ref has been recycled to a different terminal) during the verification window, `readParsedSurface` inspects the wrong terminal. A cleared composer or working status on that unrelated terminal then causes the verifier to return `outcome: "delivered"`, falsely marking the original delivery as `submitted` even though the text was never accepted by the target agent.
The `deliverAgentInput` function already resolves and validates the route before every mutation. Apply the same pattern here: call `engine.resolveAgentIoRoute(receipt.agent_id)` and use the resolved `surface_id`/`workspace_id`, falling back to `outcome: "pending"` if the route cannot be established.
Review — PR #441 (P5b: send_to v2) — ITERATEReviewed against Verification I ran myself (worktree
Reviewable as one unit — do not split. ~698 src lines across 4 files, one cohesive state machine; the ticket path is reachable only from Contract items — what holds
MUST FIX1. Item 5 (Etan's ruling) is not implemented — the headline contract item is missing. 2. Working-status promotion is a #427-class false positive. 3. Ticket + GitHub defaults are live in bare construction — contract item 3 says they must not fire in tests/CI. 4. 5. Upgrade migration will mass-fail historical receipts. SHOULD FIX6. The duplicate guard has a race window it does not close. 7. No timeout on the verifier — a hang wedges everything. 8. read_screen amplification. One MINOR
Verdict: ITERATE. The core inversion — nonterminal on timeout-without-evidence — is right and well-placed, and the plumbing (persistence, restart, wait_for, list_agents, dedupe-by-signature) is sound. But item 5 is absent, and three of the new terminal paths ( — cmuxlayerClaude-reviewer-441 (reviewer) · claude/claude-opus-5[1m] |
Busy-cursor sends were leaving the follow-ups box for a human Return and false-failing. The delivery engine now presses that Return itself and receipts queued_followup until the follow-up flushes at turn end. Co-Authored-By: cmuxlayerCursor-11c3aa25 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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EtanHey
changed the title
Re-review — round 2 (head
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| # | Finding | Still at 75223e2 |
|---|---|---|
| 2 | working-status promotion (#427 class) | src/server.ts:10912 — (!pending && isSubmitVerifiedStatus(snapshot.parsed.status)) |
| 3 | ticket dir + gh filer live in bare construction |
agent-engine.ts:1260-1261 — still ?? defaultDeliveryTicketDir() / ?? null + real-gh fallback; no VITEST/CI guard anywhere |
| 4 | target_gone instantly terminal |
src/server.ts:10878 |
| 5 | stale receipts have no verify_deadline_at backfill |
loadDeliveryReceipts untouched |
| 7 | no timeout around the verifier | agent-engine.ts:6403 — bare await this.deliveryVerifier(receipt) |
6 (duplicate-guard race) and 8 (read_screen amplification) are likewise untouched.
Must-fix 1 — fixed, with one carried defect
The mechanism is right and lands where I asked for it. cursorFollowupRetryEligiblePendingInput (src/server.ts:4750) makes the existing single-shot retry block press the Return for cursor at a 250 ms observe window, and screenShowsQueuedCursorFollowup then requires real consumption evidence — composer region empty, message tail still on screen, follow-up chrome present — before latching queued_followup. The state is nonterminal, threaded through acceptComposerQueue, findOpenDuplicate, the verifier's pending branch, the public enums, and both send paths. submit_verified is nulled and the SubmitVerificationError throw is excluded. That is contract item 5.
But the 10-minute deadline still converts it into a failure. verifyPendingDeliveries now watches queued_followup, the verifier returns pending for it forever, and the deadline branch is unchanged — so a Cursor turn longer than 10 minutes ends as failed_confirmed + evidence ticket for a follow-up we have positive evidence Cursor queued. That is strictly worse than the pending_verify case it replaced: there we were guessing, here we watched the composer get consumed and then call it a confirmed failure anyway. The contract's words for this state are "delivers at turn end". A receipt with composer-consumed evidence should not have a failure deadline — keep waiting, or terminate it as delivered-unverified, but do not file a ticket saying delivery failed.
Also new in round 2
CURSOR_FOLLOWUP_PLACEHOLDER_RE = /^Add a follow-up$/iis anchored and will not tolerate the→prefix that this repo's own patterns expect everywhere else (pattern-registry.ts:42,screen-parser.ts:273both match/→\s*Add a follow-up/i). Whether the arrow survivesextractComposerInputRegionon a live pane decides whether the placeholder normalizes to empty andqueued_followuplatches at all. The fakes say yes; a real Cursor pane has not been checked, and the PR's own live-session checkbox is still unticked. This is the mock-green/live-green line — please run the live send before merge.- The new Cursor chrome patterns are inline in
server.ts(CURSOR_FOLLOWUP_ENTER_SEND_NOW_RE,CURSOR_FOLLOWUP_PLACEHOLDER_RE) while the repo keeps exactly this kind of string insrc/pattern-registry.ts. When Cursor changes that chrome, the silent regression is a fleet-wide return to falsefailed_confirmed. Move them to the registry. - Etan's adversarial question — human-typed text in the composer — answered:
assertDeliveryTargetIsSafegates only permission prompts and picker/menu screens; it does not check for pre-existing human text. So yes, a half-written human message gets submitted along with ours. But Return feat: V2 — sidebar sync, agent hierarchy, quality tracking #1 already did that before this PR, so the new Return adds no new class of exposure. Not a blocker for fix: send_to v2 background verify and Cursor queued_followup #441 — it wants its own issue.
Verdict
ITERATE. Item 5 is genuinely delivered and cleanly implemented. Must-fix 2–5 and should-fix 6–8 have not been touched, and I do not want to see a "1–5 addressed" summary carried forward — three of those four remaining must-fixes (target_gone, the stale-receipt deadline, the working-status promotion) manufacture false terminal verdicts, and #3 can write to Etan's real ~/.cmuxlayer/tickets and open real issues from a test run. Plus the new carried defect above: queued_followup must stop inheriting a failure deadline.
— cmuxlayerClaude-reviewer-441 (reviewer) · claude/claude-opus-5[1m]
| /^\/ commands\b/i.test(trimmed) || | ||
| /^(?:Auto|Agent)(?:\s*·|$)/i.test(trimmed) || | ||
| /^ctrl\+c to stop\b/i.test(trimmed) || | ||
| CURSOR_FOLLOWUP_ENTER_SEND_NOW_RE.test(trimmed) || |
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🟠 High src/server.ts:2206
isComposerFooterOrChromeLine discards legitimate composer text such as explain the follow-up · enter send now behavior, so screenShowsPendingInput can miss input that is still present and produce incorrect submit evidence. CURSOR_FOLLOWUP_ENTER_SEND_NOW_RE matches that phrase anywhere in the line; anchor the expression to the expected chrome-line format so it cannot classify embedded composer text as chrome.
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In file @src/server.ts around line 2206:
`isComposerFooterOrChromeLine` discards legitimate composer text such as `explain the follow-up · enter send now behavior`, so `screenShowsPendingInput` can miss input that is still present and produce incorrect submit evidence. `CURSOR_FOLLOWUP_ENTER_SEND_NOW_RE` matches that phrase anywhere in the line; anchor the expression to the expected chrome-line format so it cannot classify embedded composer text as chrome.
…rminals Composer-consumed Cursor follow-ups must keep waiting, never failed_confirmed plus a ticket. Bare engines no longer write ~/.cmuxlayer/tickets or call gh; working status alone cannot promote a delivery; target_gone needs three misses; load backfills verify_deadline_at from now. Cursor follow-up chrome lives in the pattern registry and matches live arrow+same-line ctrl+c and boxed enter-send-now. Co-Authored-By: cmuxlayerCursor-11c3aa25 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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Round 3 at 64d30de. Diff contains:
Not in the diff: should-fix 6–8 (pre-register before type, verifier timeout, per-surface read dedup). Live surface:139 empty follow-up composer: surface:152 busy boxed follow-ups: Human-composer-text exposure filed as #442
— cmuxlayerCursor-11c3aa25 (worker) · cursor/unknown |
| result.delivery === "queued" || | ||
| result.delivery === "queued_followup" | ||
| ) { | ||
| receipt.delivery_state = result.delivery; |
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🟠 High src/agent-engine.ts:6574
queued_followup receipts never become terminal when the verifier keeps returning pending: acceptComposerQueue clears their verify_deadline_at, and verifyPendingDeliveries disables deadline enforcement for that state. A queued follow-up that Cursor never flushes therefore makes waitForDelivery time out indefinitely, permanently blocks identical sends via deduplication, and never produces a failed_confirmed ticket. Apply and persist the verification deadline for queued_followup as well.
Also found in 1 other location(s)
src/server.ts:6358
verifyPendingDeliveriesexplicitly disables the verification deadline for everyqueued_followupreceipt viadeadlineApplies = receipt.delivery_state !== "queued_followup". If Cursor never flushes that follow-up and the verifier keeps returningpending, the receipt remains nonterminal forever, sowait_for({delivery_id})only times out and nofailed_confirmedticket is ever produced.
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In file @src/agent-engine.ts around line 6574:
`queued_followup` receipts never become terminal when the verifier keeps returning `pending`: `acceptComposerQueue` clears their `verify_deadline_at`, and `verifyPendingDeliveries` disables deadline enforcement for that state. A queued follow-up that Cursor never flushes therefore makes `waitForDelivery` time out indefinitely, permanently blocks identical sends via deduplication, and never produces a `failed_confirmed` ticket. Apply and persist the verification deadline for `queued_followup` as well.
Also found in 1 other location(s):
- src/server.ts:6358 -- `verifyPendingDeliveries` explicitly disables the verification deadline for every `queued_followup` receipt via `deadlineApplies = receipt.delivery_state !== "queued_followup"`. If Cursor never flushes that follow-up and the verifier keeps returning `pending`, the receipt remains nonterminal forever, so `wait_for({delivery_id})` only times out and no `failed_confirmed` ticket is ever produced.
Re-review — round 3 (head
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App-server constructs its own engine, shares delivery-receipts.json with MCP, and never calls setDeliveryVerifier. Without this guard the sweep observed nothing and deadline-failed watched receipts. Co-Authored-By: cmuxlayerCursor-11c3aa25 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com>
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Round 4 at 2d980c5: null-verifier guard only.
— cmuxlayerCursor-11c3aa25 (worker) · cursor/unknown |
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Final re-review — round 4 (head
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* fix: register send_to deliveries in-flight before typing Closes the concurrent-identical-sends window by recording pending_verify before the pane mutation, so a second send_to returns duplicate_of instead of typing again. Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> * fix: timeout hung delivery verifiers so sweeps cannot wedge A verifier that never settles used to leave deliveryVerifyInFlight true for the process lifetime. Mirror the submitter timeout so later deliveries can still reach terminal. Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> * fix: dedupe verify snapshots per surface and back off reads One pending delivery per sweep was issuing its own read_screen. Share one snapshot per surface and lengthen the verify interval as the deadline recedes so queued_followup polling cannot blow the read budget. Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> * fix: return timed-out wait_for delivery receipts instead of errors A 120s wait on a long Cursor turn was surfacing as a tool error. Return the still-nonterminal receipt with timed_out so callers can keep polling. Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> * fix: cap delivery-failure ticket occurrence history Persistent failures were rewriting a growing receipt log on every write. Keep the last 10 occurrences and a running count so the ticket file stays O(1). Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> * fix: use a colon-free GitHub delivery-failure marker GitHub search treats a colon as a qualifier, so the previous cmuxlayer-delivery-failure:<sig> token could not actually dedupe issues. Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> * fix: store sanitized send_to text on delivery receipts The verifier matched raw args.text while the pane received the sanitized payload, so control-character sends silently degraded every screen heuristic. Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> * fix: declare duplicate_of on DeliveryOutputShape E3 asks new receipt fields to be declared rather than relying on passthrough to carry duplicate_of. Co-Authored-By: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com> --------- Co-authored-by: cmuxlayerCursor-8742cee0 running unknown <noreply@anthropic.com> Co-authored-by: Cursor <cursoragent@cursor.com>
) * fix(t2): stop delivery receipts asserting outcomes nobody observed truth-v3 lane T2 (delivery truth), Round 1. Six issues, each with a failing test written first. #442 send_to no longer types into a composer holding text this delivery did not write. A human's half-written draft plus our payload plus Return submits their words; the picker/permission gates never covered it because the screen is an ordinary ready composer that simply is not empty. Cursor is exempt and says why: its composer retains accepted text after submit, so non-empty there is the normal post-send screen, not an unsent draft. #467 a retryable requeue now carries a bounded lifetime. A target stuck booting used to retry behind a 30s-capped backoff forever, leaving a lead a receipt it could wait on indefinitely; it now resolves failed_confirmed citing the gate reason that kept refusing. #471 #443 verify_deadline_elapsed and target_gone stop escalating to GitHub issues. Both are outcomes the engine caused -- it stopped looking, or there was nothing left to look at -- and neither is evidence the message was lost. The local evidence ticket is still written, so the verdict keeps citing evidence. #445 every nonterminal and terminal-failed receipt now carries a plain-language WARNING at the top level. ok:true with delivered:false was routinely read as success; the booleans were correct and still misread. #450 the delivery snapshot read moved inside the verify hang guard, and the CLI-fallback exec got a timeout. A wedged cmux subprocess could hold deliveryVerifyInFlight forever -- the exact stall SF7 exists to prevent. #427 boot-prompt verification refuses submit_verified while the screen reports 0 tokens. A slow boot can render a working-looking status while the prompt sits unsent; a null token count stays inconclusive on purpose. Deferred with reasons written into the issues: #435 (boot mid-turn), #420 (stale inbox replay). #432 was already closed by #441/#449; verified against the existing tests, no change in this diff. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * fix(t2): clear ITERATE — draft guard reads the prompt line, escalation reports what happened Review round 1 on #483: B1, B1a, B2 blocking; M1, M2, M3, N1, N2 minimality. B1 — the draft guard fired on ordinary Claude panes with an EMPTY composer. extractComposerInputRegion appends every following line until it recognises chrome, so `? for shortcuts`, `accept edits on` and `Working (2s - esc to interrupt)` all read as somebody's draft, and a ready pane got a hard terminal refusal. The guard now reads only the composer's own prompt line: a human draft always begins there, chrome never does. Widening the chrome whitelist is what put the hole there in the first place. B1a — a blocked composer is no longer a terminal verdict. The same screen is produced by this delivery's own unflushed prior message, and the guard cannot tell that from a human draft. Both want "wait for the composer to flush", so the refusal is now a RetryableDeliveryError: send_to returns a nonterminal queued receipt, and #467's bounded lifetime still guarantees a terminal answer. A terminal `failed` there was this PR's own disease. B2 — ticket_escalated was stamped true before three exits that mean no issue was filed (deduped signature, no filer, filer threw). Both fields are now written from one resolved outcome at every exit, and only after the filer actually resolves. M1 use withDeliveryVerifyTimeout at both race sites instead of one helper and one hand-rolled copy of itself. M2 delete the unreachable lastBootConsumptionRefuted disjunct. M3 unpack the five-deep failure-reason ternary into a named if-chain, and give assertDeliveryTargetIsSafe an options object so no caller passes a positional undefined. N1 state why paused targets deliberately do not age out. N2 killSignal SIGKILL so a SIGTERM-ignoring subprocess still cannot hang the promise. Two pre-existing defects found and filed rather than fixed here: #498 (the ticket_filed idempotence guard does not hold, so the ticket path runs twice) and #499 (vitest cross-file interference, reproducible on 49a0b2b). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Summary
send_tono longer receipts a terminalfailedwhen the sync window expires without submit evidence. That false-fail was the feat: V2 — sidebar sync, agent hierarchy, quality tracking #1 duplicate-delivery driver (Sends to a BUSY cursor always report failure — blind retries then deliver the same goal 3x #432, live specimens 4c2c4f00 / ff5ab3a6): callers retried, and the original text still landed at turn end.delivery_state: "pending_verify"(ok: true,submit_verified: null, nonterminal). A background verifier on the sweep promotes to existingsubmitted(success) orfailed_confirmed(hard 10 min deadline for uncertain states only).delivery_state: "queued_followup"(delivers at turn end). Never a falsefailed, never leaving the Return to a human.queued_followupdoes not inherit the 10-minute failure deadline. Composer-consumed evidence means keep waiting (or, if the target is gone for 3 consecutive misses,failed_confirmed). Deadline timeout never files a ticket forqueued_followup.deliveryTicketDir/deliveryIssueFiler(not in bareAgentEngine, not whenVITEST=trueorNODE_ENV=test).send_to(agent_id+text+press_enter) whilepending_verify,queued, orqueued_followupreturns the existingdelivery_idwithduplicate_ofinstead of typing again.wait_for({ delivery_id })waits until terminal.list_agents detail=fullincludes a top-leveldeliveriesarray. Nine-tool surface otherwise unchanged;send_command/send_input/ boot stay fail-closed.Round 3 (64d30de) — what this commit actually contains
Must-fix from rounds 1–2:
queued_followupexcluded fromverify_deadline_elapsed→failed_confirmed+ ticketghfiler default off;createServer/ app-server inject only outside test processestarget_goneneeds 3 consecutive misses beforefailed_confirmedloadDeliveryReceiptsbackfills missingverify_deadline_atto now + deadline, notcreated_at + deadlineAlso in this commit:
src/pattern-registry.ts→prefix and same-line trailing chrome (ctrl+c to stop)enter send nowmatches both the one-line fake (follow-ups · enter send now) and the live boxed UI (┌─ follow-ups… later lineenter send now)Not in this diff (should-fix 6–8 still open): in-flight receipt registered only after typing; no timeout around
deliveryVerifier; no per-surfaceread_screendedup/backoff.Human-typed text already in the composer: filed separately as #442 (not a #441 blocker).
Design choices
submitted. Did not rename todelivered. Booleandelivered: truestill means the existing success receipt. New states arepending_verify,queued_followup, andfailed_confirmed. Immediate confirmed fails (safety gate, send-key throw) stayfailed.queued_followupis Cursor's native queue, not the engine-sidequeuedwait. Engine-sidequeuedstill means "do not type yet, agent.state is working and allow_busy is false."queued_followupmeans the text was typed, the follow-up Return was pressed, and Cursor will flush it at turn end.Live probe (
CMUXLAYER_FORCE_INPROCESS=1) — placeholder / arrowRan against real Cursor panes (not fakes). Extracted composer by stripping
CLI_INPUT_PROMPT_PREFIXES.cursor(→/cursor>).surface:139
cmuxlayerCursor(this worker, empty follow-up composer):The arrow does survive on the live composer line, and
ctrl+c to stopis same-line trailing chrome, not a separate footer. Anchored/^Add a follow-up$/imisses both. Current registry regex matches.surface:152
brainlayerCursor(busy, boxed follow-ups with payload in composer):follow-upsandenter send noware not on one·-joined line. The old/follow-ups?\s*·\s*enter send now/imisses this box; the registry regex matches the boxed form.This probe verifies chrome/placeholder latching, not a full
send_to→queued_followup→ turn-endsubmittedroundtrip on a live pane.Test plan
bun run test— 115 files, 2740 passed, 1 skippedbun run typechecktests/send-to-v2-background-verify.test.ts(pending_verify, queued_followup Return, no deadline fail, no working-status promotion, no default tickets, target_gone ×3, deadline backfill, duplicate_of, wait_for, list_agents)enter send nowsend_toa busy Cursor pane, confirmqueued_followup, thenwait_for({delivery_id})after turn end— cmuxlayerCursor-11c3aa25 (worker) · cursor/unknown
Note
Add background verification and
queued_followupstate tosend_tov2 deliverypending_verify,queued_followup, andfailed_confirmeddelivery states sosend_to/dispatch_nudgecan defer confirmation to a background verifier instead of failing closed immediately.verifyPendingDeliveriesbackground loop inAgentEnginethat polls delivery state via a configurableDeliveryVerifier, transitions receipts tosubmittedon evidence, and tofailed_confirmedafter deadline or repeated target-gone misses.writeDeliveryFailureTicketand optionally mirrored to GitHub via theghCLI usingfileDeliveryFailureGithubIssue.CURSOR_FOLLOWUP_ENTER_SEND_NOW_RE,CURSOR_FOLLOWUP_PLACEHOLDER_RE) to classify deliveries asqueued_followupwhen the follow-up has been accepted by Cursor.wait_forsupport fordelivery_idand exposes deliveries inlist_agentsfull-detail responses; deduplication viafindOpenDuplicateprevents duplicate in-flight sends.send_to/dispatch_nudgeno longer throwSubmitVerificationError— they return non-terminalpending_verifyreceipts and are resolved asynchronously.Macroscope summarized 2d980c5.
Note
Medium Risk
Changes core
send_to/dispatch_nudgereceipt semantics and adds async verification that can mark deliveriesfailed_confirmedand file tickets; mitigated by duplicate suppression, conservative promotion rules, and test-only defaults for ticket I/O.Overview
send_tov2 stops treating “no submit evidence within the sync window” as a terminalfailedreceipt. Forsend_toanddispatch_nudge, ambiguous outcomes now returnpending_verify(ok: true, nonterminal,submit_verified: null) so callers do not blind-retry into duplicate deliveries.A background verifier runs on each lifecycle sweep (
verifyPendingDeliveries), using screen/transcript evidence to promote receipts tosubmittedorfailed_confirmed(10-minute deadline for uncertain states, not forqueued_followup).target_gonerequires three consecutive misses before hard failure.Cursor follow-ups: new pattern-registry chrome detection plus submit-verify logic can press the follow-up “enter send now” Return, then receipt
queued_followupwhen the composer is consumed into Cursor’s queue (distinct from engine-sidequeuedwhileworking).Operator surface: identical in-flight sends return
duplicate_of;wait_for({ delivery_id })blocks until terminal;list_agents detail=fullexposes deliveries. Confirmed failures can write deduped local tickets and optionalghissues when production injects ticket dir/filer (disabled in tests and bareAgentEngine).Reviewed by Cursor Bugbot for commit 2d980c5. Bugbot is set up for automated code reviews on this repo. Configure here.