feat(label): mark stacked pull requests so reviewers can filter them by easonLiangWorldedtech · Pull Request #1925 · Zoo-Code-Org/Zoo-Code

easonLiangWorldedtech · 2026-10-05T16:50:58Z

Fixes #1945 (the reviewer-facing half of #1923; the measurement half is #1924, and #1923 is closed only after both land).

What changes

The reconcile workflow already reads PR metadata, so it can identify a stacked unit and apply a stacked label. Reviewers can then filter the PR list to standalone PRs and see which PRs are units of a chain.

A stacked unit is a head commit with exactly one parent, and that parent is another open PR's head.
stacked is added to labelDefinitions, so the workflow creates the label if missing.
It is reconciled separately from the review-state labels, so reconcileLabels never removes it.
A stale stacked label is removed when the parent is no longer another open PR head.
The open-PR map is read only when there is a PR to reconcile, so an unassociated workflow run still resolves to zero reads.
A commit lookup failure is an advisory, not a failure.
contents: read is added for the commit-parent lookup; the job still never checks out or executes PR code.

Tests

vitest run services/__tests__/pr-review-state-workflow.test.ts
Tests  171 passed (171)

Four existing assertions were updated because the new map read is an intended extra read: the CodeRabbit status-comment test, manual dispatch, the associated workflow run, and the created-label count (5 -> 6 with stacked).

ESLint on the changed test file: clean with --max-warnings=0.

A stacked unit's head commit has exactly one parent, and that parent is another open pull request's head. The reconcile workflow already reads PR metadata, so it can identify that relationship and apply a `stacked` label, which lets reviewers filter the PR list to standalone PRs. The label is orthogonal to the review-state labels, so it is reconciled separately and never removed by reconcileLabels. A stale label is removed when the parent is no longer another open PR head. The open-PR map is read only when there is a PR to reconcile, so an unassociated workflow run still resolves to zero reads. A commit lookup failure is an advisory, not a failure. This is the labelling half of Zoo-Code-Org#1923; the measurement half is Zoo-Code-Org#1924.

coderabbitai · 2026-10-05T16:51:07Z

📝 Summary

Summary by CodeRabbit

New Features
- Open pull requests based on another open pull request are automatically marked with a “stacked” label. The label is removed when the relationship no longer applies.
- A pull request qualifies only when its head commit has exactly one parent matching another open pull request’s head; merge commits with multiple parents do not qualify.
- On read-only fork review runs, the label is left unchanged. If the relationship cannot be verified or a label operation fails, a warning is logged.
- Review-state labels continue to be reconciled independently, including when stacked-label reconciliation encounters an error.

Walkthrough

The workflow identifies pull requests whose head commit has exactly one parent matching another open pull request’s head. It adds or removes a separate stacked label before review-state processing.

Changes

Stacked pull request labeling

Layer / File(s)	Summary
Detect and reconcile stacked pull requests `.github/workflows/label-pr-review-state.yml`, `src/services/__tests__/pr-review-state-workflow.test.ts`	The workflow reads open pull request heads and commit parents, then adds or removes the `stacked` label independently of review-state labels. Fork review runs skip label mutation. Lookup and mutation errors produce warnings. Tests cover these behaviors and the associated permissions and API calls.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant Event as Pull request event
  participant Workflow as label-pr-review-state workflow
  participant GitHubAPI as GitHub REST API
  Event->>Workflow: Start label reconciliation
  Workflow->>GitHubAPI: List open pull request heads
  GitHubAPI-->>Workflow: Return head SHAs
  Workflow->>GitHubAPI: Read pull request head commit parents
  GitHubAPI-->>Workflow: Return parent SHAs
  Workflow->>GitHubAPI: Add or remove stacked label

Merge Risk: ⚪ Minimal · up to 092b0

This change adds a reviewer-filtering label for stacked pull requests, with failure handling that keeps review-state labeling running. No merge-blocking risk was identified.

🚥 Pre-merge checks | ✅ 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	For [`#1945`], `.github/workflows/label-pr-review-state.yml` defines `stacked` outside `stateLabels` and reconciles it separately. It adds the label only when the PR head has exactly one parent and that…
Out of Scope Changes check	✅ Passed	The workflow permission, `stacked` label definition, and reconciliation tests support [`#1945`]. No unrelated changes are identified.
Regression Evidence	✅ Passed	The changed workflow behavior has focused coverage in the workflow-script test harness, which parses and exercises the actual YAML script with GitHub API doubles. Tests cover parent matching and label…
Security Boundaries	✅ Passed	No changed path meets the security failure conditions. The workflow adds only `contents: read` and uses it to request commit-parent metadata. It does not check out or execute PR code, and the new `sta…
Persistence Integrity	✅ Passed	No changed persistence path meets the failure condition. The workflow awaits stacked-label creation, addition, and removal. It updates the in-run PR label state only after a successful add or removal.…
Lifecycle Resource Cleanup	✅ Passed	The pull request adds no listener, watcher, timer, provider, or other long-lived resource. The workflow changes add awaited GitHub API calls and per-PR label reconciliation in a one-shot workflow job.…
Title check	✅ Passed	The title clearly summarizes the main change: adding a stacked label so reviewers can filter pull requests.
Description check	✅ Passed	The description explains the change, its implementation, linked issues, and test results. It does not complete the pre-submission checklist or provide the requested Discord username, but these omissio…

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github-actions · 2026-10-05T17:19:18Z

Review status

Thanks for contributing. This comment tracks the review sequence and the next action.

Current step: Awaiting fresh human maintainer or CODEOWNER approval.

Automated review is complete for the latest commit but does not replace human approval.

Review-state labels are managed by this workflow; do not edit them manually. community-approved is managed the same way — do not add or remove it manually. It signals a fresh community code approval for the current head as an advisory priority only; maintainer review is still required.

The test wrote a scratch file to an absolute path, which fails on CI. Removed the debug write and the debug console.log; 171 tests pass and ESLint is clean with --max-warnings=0.

codecov · 2026-10-05T17:54:43Z

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easonLiangWorldedtech · 2026-10-06T02:59:14Z

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Inline comments:
Review comments at @.github/workflows/label-pr-review-state.yml:
- Line 94: Update the description field to state only that the head commit
directly descends from another open PR head; do not claim that the PR diff
contains only this unit.
- Line 588: Update the openPrHeads lookup around buildOpenPrHeads to catch and
warn on lookup failure without substituting an empty map; skip stacked-label
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Add a test where the open-PR list call rejects and verify reconciliation still
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Review comments at @src/services/__tests__/pr-review-state-workflow.test.ts:
- Around line 518-522: Add a boundary case to the runWorkflow tests with
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…-PR map fails Three findings from the review at head: 1. Stability & Availability (major). A failed open-PR list call rejected before any PR reached the existing error handler, so one API failure stopped review-state labels and gate updates even when the target PR was fetched. The lookup is now caught and warned, and the map is left unset so reconcileStackedLabel skips label mutation for that run - an empty map would look like "no open parents" and remove valid stacked labels. 2. Maintainability (major). Added the boundary case: a head with two parents where one parent is an open PR head must not be labelled stacked, because a unit is one commit on top of its parent. 3. Functional Correctness (minor). The comment now describes what the check actually detects - the head commit directly descends from another open PR head - rather than claiming the PR targets the branch below it. Local run: 173 tests pass, eslint clean, no suppression count change.

easonLiangWorldedtech · 2026-10-06T10:09:39Z

Regression Evidence warning addressed: the commit-lookup failure test now starts with stacked and asserts the label is still on the PR after the run, so an unreadable parent is not treated as evidence that the relationship ended.

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- Line 284: Update the getCommit mock and stacked-label test so they verify the
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.github/workflows/label-pr-review-state.yml (1)

94-94: Correct the stacked label description.

The workflow checks commit ancestry, not the PR base. If a child PR targets main, its diff can include its parent PR’s changes. Describe direct descent from another open PR head instead of claiming the diff contains only this unit. GitHub ties a layer-only diff to the correct base branch. (docs.github.com)

coderabbitai · 2026-10-06T10:12:47Z

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… commit looked up Three weak assertions from the review: - the stale-removal case now also asserts the label recorded for the PR is cleared, not only that the removal call happened; - the missing-label case asserts the full definition (name, colour, description) rather than that some call mentioned the name; - the stacked test asserts the lookup targets the PR head SHA, so a regression that reads the wrong commit no longer passes. Local run: 176 tests pass, eslint clean, no suppression count change.

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src/services/__tests__/pr-review-state-workflow.test.ts (1)
520-537: 🎯 Functional Correctness | 🔵 Trivial | ⚡ Quick win

Assert the commit_sha that the workflow requests.

getCommit ignores its arguments, so a regression that requests the wrong commit can still pass these tests. A previous review made the same point. Change the mock to throw when commit_sha !== SHA, or assert the call arguments in the stacked-label tests.
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Review comment at @src/services/__tests__/pr-review-state-workflow.test.ts
around lines 520 - 537:
Update the getCommit mock used by runWorkflow in the stacked-label tests to fail
when the requested commit_sha is not SHA, or assert the relevant getCommit call
arguments directly, so the tests detect requests for the wrong commit.
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Review comments at @src/services/__tests__/pr-review-state-workflow.test.ts:
- Around line 520-537: Update the getCommit mock used by runWorkflow in the
stacked-label tests to fail when the requested commit_sha is not SHA, or assert
the relevant getCommit call arguments directly, so the tests detect requests for
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.github/workflows/label-pr-review-state.yml (1)

273-301: Stale-label removal skips the closed/merged parent case only by accident of API behavior; verify the head-map gate is sound.

reconcileStackedLabel runs for every PR, but it reads pr.labels from the event payload or list result. In a pull_request_target labeled/unlabeled event, the payload can be stale relative to the live label state. The add and remove calls handle this: addLabels is idempotent, and a 404 on removeLabel is caught by the outer catch and logged as a warning. The 404 case therefore produces a spurious warning but no failure. This is acceptable.

No concrete defect found in this range. The contents: read permission matches the getCommit call. The multi-parent and null-map branches are covered by the tests.

easonLiangWorldedtech · 2026-10-06T10:15:12Z

Three weak-assertion findings addressed at b3d4cba47:

the stale-removal case now asserts the label recorded for the PR is cleared, not only that the removal
call happened;
the missing-label case asserts the full definition (name, colour c2c2c2, description) instead of
toBeDefined() on a name match;
the stacked test asserts the lookup targets the PR head SHA, so a regression that reads a different
commit no longer passes.

Local run: 176 tests pass, eslint clean, no suppression count change.

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- Around line 91-92: In the managed-label provisioning flow, catch `createLabel`
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…liation The 404 from getLabel is handled, but if createLabel then rejects the error escapes the provisioning loop before any PR is reconciled, so adding stacked added a new failure point for the whole run. Creation failures for stacked are now caught, warned, and skipped - the label is only a reviewer filter. Every other managed label still fails closed, because reconciliation cannot work without it. Added a harness case that rejects creation of stacked and asserts reconciliation continues (the stale awaiting-maintainer label is still reconciled and the run is not failed). Local run: 177 tests pass, eslint clean, no suppression count change.

easonLiangWorldedtech · 2026-10-06T10:56:36Z

Addressed at 092b03d72.

Creation failures for stacked are now caught, warned, and skipped, so a failed provisioning of the
reviewer-filter label no longer stops reconciliation for every PR. Every other managed label still
fails closed, because reconciliation cannot work without it.

Added the harness case that rejects creation of stacked and asserts reconciliation continues (the stale
awaiting-maintainer label is still reconciled and the run is not failed).

Local run: 177 tests pass, eslint clean, no suppression count change.

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.github/workflows/label-pr-review-state.yml (1)
94-94: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Describe the commit relationship, not the PR diff.

If a child PR targets main, its head can directly descend from another open PR’s head while its diff includes both units. The detector does not inspect the PR base, so this description incorrectly promises a one-unit diff. Replace that promise with the parent-commit relationship. Update the matching assertion in src/services/__tests__/pr-review-state-workflow.test.ts at Line 715. GitHub’s focused stacked diff depends on the child targeting the branch below it. (docs.github.com)
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Review comment at @.github/workflows/label-pr-review-state.yml at line 94:
Update the description for the head-commit relationship in the workflow detector
to describe that the commit descends from another open PR’s head, without
claiming its diff contains only one unit. Update the matching assertion in the
PR review state workflow test to expect the revised description.

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Duplicate comments:
Review comments at @.github/workflows/label-pr-review-state.yml:
- Line 94: Update the description for the head-commit relationship in the
workflow detector to describe that the commit descends from another open PR’s
head, without claiming its diff contains only one unit. Update the matching
assertion in the PR review state workflow test to expect the revised
description.

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Check persistence and lifecycle invariants: awaited atomic writes, rollback or explicit partial-failure behavior, cross-window state consistency, stale listeners/watchers, cancellation, idempotency, and safe restart/resume without lost or d...

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src/services/__tests__/pr-review-state-workflow.test.ts

easonLiangWorldedtech requested review from JamesRobert20, edelauna, navedmerchant and taltas as code owners October 5, 2026 16:50

easonLiangWorldedtech mentioned this pull request Oct 5, 2026

mutation-diff charges a stacked unit the whole unmerged chain #1923

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test(label): drop the debug write left in the stacked-label test

7752417

The test wrote a scratch file to an absolute path, which fails on CI. Removed the debug write and the debug console.log; 171 tests pass and ESLint is clean with --max-warnings=0.

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Merge branch 'main' into feat/label-stacked-prs

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