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| (Phase::WaitingForRefill, Event::PoolWindowAdded { label, .. }) => { | ||
| // The refill produced a new label. Record + complete. | ||
| // (Spec § 7.1: Step 3 is just `Done`; no further | ||
| // dispatch.) | ||
| self.refilled_label = Some(label.clone()); | ||
| SagaAction::Done |
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This saga marks itself Done on the first PoolWindowAdded it sees, but run_coordinator broadcasts every event to every in-flight saga (agentmux-launcher/src/saga/mod.rs), so concurrent promotes are mis-correlated: if two promotes are in flight, the first refill event will complete both sagas. That produces an early SagaCompleted for at least one promote, which breaks the intended buffering bracket semantics and leaves the later refill event unbracketed.
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| // before refill actually finished — the renderer's buffered | ||
| // state would flush prematurely. | ||
| match (&self.phase, event) { | ||
| (Phase::WaitingForRefill, Event::PoolWindowAdded { label, .. }) => { |
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PoolRespawn transitions to Done on the first PoolWindowAdded event it sees, without checking that the add belongs to this promote. Because the coordinator broadcasts each event to every in-flight saga (run_coordinator fan-out), overlapping promotes (or any unrelated pool add emitted while a promote saga is waiting) can cause one add event to complete multiple sagas early, leaving the real later refill outside the expected SagaStarted/SagaCompleted bracket for that promote.
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| crate::log(&format!( | ||
| "[saga] dropping {} trigger — same-kind saga already in flight (codex P1 #634 serialization fallback)", | ||
| new_kind, | ||
| )); |
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This branch drops every new PoolWindowPromoted trigger whenever one pool_respawn_on_promote saga is still in flight, but PoolRespawn has no timeout/failure path for missing PoolWindowAdded and can wait indefinitely. In that case (e.g., refill failure or a missed terminal event), the first stalled saga blocks all future promote sagas for the rest of the process lifetime, so retries on later promotes never happen and renderer saga brackets are permanently suppressed.
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| ReAgent Version | 5.12.11 |
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| Timestamp | 2026-05-01T11:39:45Z |
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| PR | #634 |
LGTM
First real consumer of the launcher-side saga coordinator (previously
a framework-stub from E.1a). Formalizes today's implicit
"promote → refill" flow as an explicit saga so the renderer sees
SagaStarted/SagaCompleted brackets and can buffer related events
atomically.
Spec: docs/specs/SPEC_PHASE_F_HOST_REDUCER_2026-05-01.md §7.1.
What changed
- New saga: agentmux-launcher/src/saga/pool_respawn.rs.
- New wire: Command::ReportPoolWindowPromoted, Command::SpawnPoolWindow,
Event::PoolWindowPromoted.
- saga.rs reorganised into saga/mod.rs to host pool_respawn submodule.
- Launcher coordinator now actively starts sagas on trigger events
(Event::PoolWindowPromoted), routes events to in-flight sagas, and
emits SagaStarted/SagaCompleted/SagaFailed on the bus.
- Host's promote_pool_window emits the new ReportPoolWindowPromoted
between the existing remove + open pair so the launcher's reducer
has unambiguous evidence of a promote (vs pre-promote destroy).
- Launcher reducer's misrouted-command map gains arms for the new
variants (consistent with srv-pipe misroute pattern).
- Test-only extract_version helper updated to match the now-larger
Event variant set (was already missing TabMoved/BlockMoved/
FocusedNodeChanged/MagnifiedNodeChanged from prior PRs).
Cross-process dispatch caveat
The saga issues SagaAction::IssueCmd { target: Host, cmd: SpawnPoolWindow }
for state-machine completeness. The launcher coordinator currently
LOGS the dispatch — there is no launcher→host command pipe yet
(host's launcher_ipc.rs is wired host→launcher only). The saga relies
on the host's existing implicit spawn_pool_window call inside
promote_pool_window to produce the matching Event::PoolWindowAdded.
F.6 (or the cross-process-dispatch follow-up) replaces the log with a
real wire-level send. Per F-spec §7.1's scope-down guidance.
Tests
cargo test -p agentmux-launcher: 79/79 passing (was 69; +10 saga tests).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
…n limitation Codex caught that the pool_respawn saga relies on the coordinator's broadcast-to-all routing, so with two promotes in flight the first PoolWindowAdded completes BOTH sagas — early SagaCompleted for the second promote, later refill event left unbracketed. Proper fix requires either FIFO routing in run_coordinator or per-saga sequence-number correlation. Both are non-trivial and depend on the cross-process dispatch landing first (so the saga's IssueCmd is actually causal). Closed in F.6/F.7 alongside the launcher→host command pipe. This PR ships the limitation observable: - Doc comment in pool_respawn.rs detailing the limitation, when it triggers, the renderer-visible consequence, and the closure plan. - Runtime WARN log in run_coordinator's saga insertion path when starting a saga of a kind already in flight. Operators can spot the pattern in --diag wrr / launcher logs. Reducer + SQLite state remain correct under all paths — the limitation is a renderer-side bracketing inconsistency only. 79/79 launcher tests pass.
Round 2's doc-as-mitigation didn't satisfy codex (re-flagged round 3). Implementing the actual fix as a serialization gate: the coordinator drops a PoolWindowPromoted trigger if a same-kind saga is already in flight. Falls back to legacy pre-saga semantics for the second concurrent promote (no bracket emitted) while the first proceeds correctly. Trade-off vs full FIFO routing / per-event saga_id correlation: - Pros: small, local change; preserves first-promote bracket; reducer + SQLite state correct under all paths; no architecture refactor. - Cons: rapid back-to-back tear-offs lose the bracket on the 2nd promote (drops to pre-saga implicit flow). Proper fix (FIFO event routing or per-event saga_id correlation) deferred to F.6/F.7 alongside cross-process dispatch. 79/79 launcher tests pass.
Round 3's silent-drop-on-conflict had a permanent-deadlock failure mode: a stalled saga (refill never arrived, e.g. host-side spawn failure) would block ALL future promote sagas for the rest of the process lifetime — renderer brackets permanently suppressed. Fix: evict-and-replace. New PoolWindowPromoted trigger evicts any in-flight pool_respawn saga (emitting SagaFailed for the evicted saga + removing from registry) before starting the new saga. Trade-offs: - Pros: no permanent block; each new promote gets a fresh bracket; reducer + SQLite stay correct under all paths. - Cons: when two healthy promotes happen in quick succession, the first promote's bracket is cut short with SagaFailed (the late refill event for that promote completes the *new* saga instead). Renderer-visible: one premature SagaFailed + one correct SagaCompleted. Proper FIFO routing or per-event saga_id correlation deferred to F.6/F.7 alongside cross-process dispatch landing. 79/79 launcher tests pass.
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| (Phase::WaitingForRefill, Event::PoolWindowAdded { label, .. }) => { | ||
| // The refill produced a new label. Record + complete. | ||
| // (Spec § 7.1: Step 3 is just `Done`; no further | ||
| // dispatch.) | ||
| self.refilled_label = Some(label.clone()); | ||
| SagaAction::Done |
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Complete the saga only after identifying the refill caused by this promote, not on any PoolWindowAdded. As written, the first PoolWindowAdded after start ends the saga, so a background add (for example, startup/top-up adds that can still be in flight while a promote happens) can emit SagaCompleted before the promote’s own refill arrives. That produces premature bracket closure in subscribers and leaves the real refill event outside the intended saga boundary.
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| Field | Value |
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| ReAgent Version | 5.12.11 |
| Trigger | Re-review (new commits) |
| Project Context | CLAUDE.md loaded |
| Model | claude-opus-4-6 |
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| Ref Repos | Disabled |
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| Review Time | 60.7s |
| Timestamp | 2026-05-01T11:42:30Z |
| Repository | agentmuxai/agentmux |
| PR | #634 |
LGTM
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Codex Review: Didn't find any major issues. Another round soon, please! ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
If Codex has suggestions, it will comment; otherwise it will react with 👍. Codex can also answer questions or update the PR. Try commenting "@codex address that feedback". |
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Summary
Step 6 PR 1 of the architecture-completeness plan: F.5 pool-respawn-on-promote saga. First real consumer of the launcher-side saga coordinator (previously a framework-stub from E.1a). Formalizes today's implicit "promote → refill" flow as an explicit cross-process saga so the renderer sees
SagaStarted/SagaCompletedbrackets and can buffer related events atomically.Closes (partial): reducer-architecture-gaps §3 cross-process saga.
Spec:
docs/specs/SPEC_PHASE_F_HOST_REDUCER_2026-05-01.md§7.1.Plan:
docs/retro/next-steps-architecture-completeness-2026-05-01.mdstep 6.What changed
agentmux-launcher/src/saga/pool_respawn.rs(~300 LOC including tests).agentmux-launcher/src/saga.rs→saga/mod.rsto host the submodule.agentmux-common::ipc:Command::ReportPoolWindowPromoted { label }(host→launcher).Command::SpawnPoolWindow(launcher→host, framework target — see caveat).Event::PoolWindowPromoted { label, version }(launcher→subscribers).Event::PoolWindowPromoted, routes events into in-flight sagas viaSaga::on_event, and emitsSagaStarted/SagaCompleted/SagaFailedbrackets.agentmux-cef::commands::window_pool::promote_pool_windowcallsreport_pool_window_promotedbetween the existingreport_pool_window_removed+report_window_openedpair (only on the validated-HWND path — pre-promote destroy paths don't trigger the saga).extract_versionhelper updated to match the now-larger Event variant set (was already missingTabMoved/BlockMoved/FocusedNodeChanged/MagnifiedNodeChangedfrom prior PRs).Cross-process dispatch caveat (scoped down per F-spec §7.1)
The saga issues
SagaAction::IssueCmd { target: Host, cmd: SpawnPoolWindow }for state-machine completeness. The launcher coordinator currently logs the dispatch — there is no launcher→host command pipe yet (host'slauncher_ipc.rsis wired host→launcher only). The saga relies on the host's existing implicitspawn_pool_windowcall insidepromote_pool_windowto produce the matchingEvent::PoolWindowAdded. F.6 (or the cross-process-dispatch follow-up) replaces the log with a real wire-level send. This is acceptable per the F-spec §7.1 final paragraph: "If the cross-process plumbing is too heavy a lift for one PR, scope down: implement the saga shape + the launcher-side coordinator entry, even if the actual cross-process dispatch is initially in-process."What's NOT in this PR
Test plan
cargo check --workspaceclean (only pre-existing warnings).cargo test -p agentmux-launcher— 79/79 passing (was 69; +10 saga tests).pool_respawn::tests(state machine: start, complete, ignore unrelated, first-wins, end-to-end coordinator integration).saga::tests(trigger matching, lifecycle-event filter, monotonic id, drain-without-trigger).SagaStarted name=pool_respawn_on_promote+SagaCompletedbrackets visible in--diag wrroutput around the implicit pool refill.🤖 Generated with Claude Code