fix: retain terminal loop effect results in web by franciscpd · Pull Request #408 · compozy/compozy

franciscpd · 2026-08-15T03:41:44Z

What & why

Fixes #405.

Terminal Loop effects are appended after the terminal run state commits. The Web hook closed its EventSource as soon as it received status_changed(done), so a later retained or live effect_results frame never reached the run timeline. Reloading repeated the same race.

This change makes the mounted run-detail hook own the source through post-terminal frames. Successful and denied effect results now reach the existing reducer in order, while replacement, window deactivation, navigation, and unmount keep the normal cleanup path.

Release note:

Keep terminal Loop effect results visible in run details after completion and reload.

How you verified it

mise exec -- bunx turbo run test --filter=compozy-web -- --run src/systems/loops/hooks/__tests__/use-loop-stream.test.tsx
mise exec -- make bun-lint bun-typecheck web-build
mise exec -- make fmt-check source-size
mise exec -- make gate-full

The hook regression test sends terminal status_changed followed by effect_results, verifies both frames arrive in order, and verifies cleanup closes the source. Existing stale-subscription and replacement coverage remains green.

Fresh isolated visual QA exercised successful and denied terminal effects with the daemon fix from #403. Both results appeared in the timeline live and after a full reload, with no mounted-page console error; the isolated lab teardown completed with no surviving processes.

Co-authored with Codex. I independently reviewed the diff and reran the focused frontend, build, and repository gates.

Impact

Web: Loop run details retain the stream after terminal status so asynchronous terminal effect results remain observable.
CLI / HTTP / UDS / config / schemas: unchanged.
Daemon and extensions: unchanged by this PR.
Docs: no public behavior or configuration surface changes; the implementation design documents the stream lifecycle.

Stream lifetime tradeoff

This fixes the event-ordering race by keeping the mounted run-detail subscription alive after terminal status. A visible terminal run page therefore retains one idle SSE connection until normal subscription cleanup. The OS live-data fence limits ownership to a visible document and a window on the active desktop that is not minimized and is active in its stack; deactivation, replacement, navigation, or unmount closes the source.

Closing on status_changed is incorrect because effects are asynchronous. Closing on the first effect_results is also incorrect because a terminal hook may declare multiple effects. A deterministic earlier close would require a new daemon event meaning “all terminal effects are settled.” That protocol change is intentionally out of scope so the maintainer can decide whether its additional server/API complexity is warranted.

make gate passes locally (make gate-full before review on larger changes)
New or changed behavior is covered by tests, or I explained above why not
If an agent wrote or co-wrote this, I named it above and verified the result myself

Summary by CodeRabbit

Bug Fixes
- Terminal run streams now continue delivering follow-up effect results after terminal status is received.
- Preserved generation-zero failures and terminal reactions when navigating away and returning or reloading.
- Prevented closed streams from delivering additional messages or errors.

vercel · 2026-08-15T03:41:49Z

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coderabbitai · 2026-08-15T03:42:49Z

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Walkthrough

The loop stream hook now remains open after terminal status frames. It delivers later effect_results frames and closes only during cleanup. Tests verify ordered delivery, closure tracking, and unmount cleanup.

Changes

Loop stream lifecycle

Layer / File(s)	Summary
Retain stream through terminal frames `web/src/systems/loops/hooks/use-loop-stream.ts`, `web/src/systems/os/apps/loops/use-loop-run-page.ts`	The hook no longer closes the stream when it receives a terminal status. The run page documentation describes continued post-status effect-result replay.
Verify post-terminal delivery `web/src/systems/loops/hooks/__tests__/use-loop-stream.test.tsx`	The fake SSE source tracks closure and suppresses delivery after closure. The regression test verifies terminal status and `effect_results` delivery before unmount.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 2185c

The stream-lifetime fix is merge-ready after normal checks, with no actionable merge-blocking risk remaining; one minor follow-up is to assert that unmount closes the stream source.

Possibly related PRs

compozy/compozy#407: Changes backend daemon-effect authorization while this PR changes frontend SSE stream lifecycle handling.

Suggested reviewers: pedronauck

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the primary fix: retaining terminal Loop effect results in the Web application.
Linked Issues check	✅ Passed	The hook keeps streams open for post-terminal effect results, closes on unmount, and adds regression coverage for ordered delivery.
Out of Scope Changes check	✅ Passed	All reviewed changes directly support terminal Loop effect-result streaming and related regression coverage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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greptile-apps · 2026-08-15T03:44:37Z

Greptile Summary

The PR keeps the Loop run-detail SSE subscription active after terminal status so later retained or live effect results reach the existing reducer.

Removes terminal-status-triggered source closure while preserving normal effect cleanup.
Updates the stream lifecycle documentation and run-page commentary.
Adds regression coverage for ordered terminal status and effect-result delivery through unmount.

Confidence Score: 5/5

The PR appears safe to merge because no blocking failure remains.

No blocking failure remains.

Important Files Changed

Filename	Overview
web/src/systems/loops/hooks/use-loop-stream.ts	Removes eager terminal-status closure so the mounted hook owns the stream until normal cleanup.
web/src/systems/loops/hooks/tests/use-loop-stream.test.tsx	Makes the fake source honor closure and verifies post-terminal effect delivery and unmount cleanup.
web/src/systems/os/apps/loops/use-loop-run-page.ts	Updates lifecycle commentary to describe replay through post-status effect results.
docs/superpowers/specs/2026-08-14-loop-terminal-effect-stream-design.md	Documents the page-owned stream lifetime, preserved fences, and cleanup boundaries.
docs/superpowers/plans/2026-08-14-loop-terminal-effect-stream.md	Adds the implementation, validation, impact-audit, and QA workflow plan for the lifecycle fix.

_{Reviews (2): Last reviewed commit: "docs: complete loop stream impact audit" | Re-trigger Greptile}

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Actionable comments posted: 1

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Inline comments:
In `@web/src/systems/loops/hooks/__tests__/use-loop-stream.test.tsx`:
- Line 341: Update the unmount cleanup test around unmount() to assert that the
stream source is closed after the component unmounts, while preserving the
existing assertion that it remains open before cleanup.

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⛔ Files ignored due to path filters (2)

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📒 Files selected for processing (3)

web/src/systems/loops/hooks/__tests__/use-loop-stream.test.tsx
web/src/systems/loops/hooks/use-loop-stream.ts
web/src/systems/os/apps/loops/use-loop-run-page.ts

franciscpd added 4 commits August 14, 2026 23:38

docs: design terminal loop effect stream lifecycle

042edde

docs: plan terminal loop effect stream fix

608df0b

docs: refine terminal effect stream plan

6f9f6a0

fix: keep loop streams open for terminal effects

2185c51

franciscpd requested a review from pedronauck as a code owner August 15, 2026 03:41

greptile-apps Bot reviewed Aug 15, 2026

View reviewed changes

Comment thread docs/superpowers/plans/2026-08-14-loop-terminal-effect-stream.md

coderabbitai Bot requested changes Aug 15, 2026

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Comment thread web/src/systems/loops/hooks/__tests__/use-loop-stream.test.tsx

coderabbitai Bot previously approved these changes Aug 15, 2026

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docs: complete loop stream impact audit

c2cb548

franciscpd dismissed coderabbitai[bot]’s stale review via c2cb548 August 15, 2026 03:54

coderabbitai Bot approved these changes Aug 15, 2026

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pedronauck merged commit a35eda6 into compozy:main Aug 15, 2026
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fix: retain terminal loop effect results in web - #408

fix: retain terminal loop effect results in web#408
pedronauck merged 5 commits into
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franciscpd:fix/loop-terminal-effect-stream

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What & why

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Stream lifetime tradeoff

Summary by CodeRabbit

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