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.

Updated 2026-10-11 (head `980566f95`)

Merged current upstream/main (9c069e94e) (merge commit 980566f95), clearing the has-conflicts state.
One conflict resolved: .github/workflows/label-pr-review-state.yml — main prettier-reformatted the whole workflow to the 4-space style required by the new Check formatting step of the compile job; the stacked-label additions from this PR (the contents: read permission, the stacked label definition with fail-soft provisioning, buildOpenPrHeads/reconcileStackedLabel, the open-PR map read, and the per-PR reconcile call) were re-applied on top of main's formatting. The merged file is whitespace-equivalent to the pre-merge head (only main's own types-array re-wrap differs) and prettier-clean.

Verification at this head: vitest run services/__tests__/pr-review-state-workflow.test.ts → 177 passed (177) (the count grew from 171 because main added cases to this file; the merge keeps both sides); ESLint --max-warnings=0 clean on the touched test file; tsc --noEmit shows no error in any file this PR touches; Prettier clean on the merged workflow; no new as any, no changeset/CHANGELOG files.

Updated 2026-10-11 (round 2, head `2be3bcba5`)

Merged current upstream/main (995167eed) again (merge commit 2be3bcba5) — main moved past the previous sync with no overlap against the workflow changes.
Format-gate fix (16ac4c494): the compile job's new pnpm format:check step flagged a long condition in pr-review-state-workflow.test.ts; prettier-only rewrap, no semantic change.

Verification at this head: 177/177 workflow tests; ESLint clean; Prettier clean on both PR files under the repo config.

Updated 2026-10-11 (round 3, head `4f4197345`)

Merged upstream/main fafad20b0 — main's sharding rework (issue 1707) rewrote both files this PR touches, so this is a semantic re-application, not a sync merge:
- label-pr-review-state.yml: main replaced the per-label getLabel probe with a single listLabelsForRepo read plus duplicate-race-tolerant createLabel. The stacked fail-soft is re-applied inside that structure — a failed stacked provisioning warns and continues (reviewer filter only); every other managed label still fails closed with the duplicate-race tolerance.
- pr-review-state-workflow.test.ts: the open-PR-map behavior (openPrHeadsError, openPrHeads) is folded into main's createListPullRequests helper; the getCommit mock is kept; the stacked fail-soft test now drives the new provisioning path; created-label counts move 5 → 6 (stacked is a sixth definition), including main's shard duplicate-race test.

Verification at this head: vitest run services/__tests__/pr-review-state-workflow.test.ts → 205 passed (205) (main's sharding suite + this PR's stacked suite); ESLint --max-warnings=0 clean; Prettier clean on both files.

Updated 2026-10-12 (round 4, head `bb7295f41`)

Addressed the review at 4f4197345 (1 thread, now resolved): the open-PR head map moved from the reconcile shards into the resolve job.

With main's sharding, every shard built the map itself — a sweep of 201–300 open PRs multiplied the paginated pulls.list read by the shard count (~600 extra calls) against the Actions token budget.
resolve now builds the map once and exports it as the open_pr_heads output; the sweep branch reuses the open list it already pages, so sweeps pay zero extra reads and direct events exactly one.
Shards parse the map from the OPEN_PR_HEADS job env. Empty or unparseable keeps the fail-soft: the stacked label is skipped, never decided from an empty map. A failed list read in resolve warns and emits an empty output.

Verification at this head: vitest run services/__tests__/pr-review-state-workflow.test.ts → 207 passed (207) (two new resolve tests: sweep reuse + fail-soft output; shard tests assert zero pull-request reads); ESLint --max-warnings=0 clean; Prettier clean on both files.

Updated 2026-10-12 (round 5, head `50734f7f6`)

Addressed the review at bb7295f41 (2 threads, both resolved):

An open-PR list that yields zero entries is now treated as an unavailable map: resolve emits an empty output instead of {}, so shards keep the fail-soft and never remove a valid stacked label based on a map that looks empty (the reconciliation target itself is open, so a zero-entry list is anomalous).
Added the resolver-to-shard contract test: asserts the reconcile job's OPEN_PR_HEADS env references needs.resolve.outputs.open_pr_heads and drives a stacked add from the resolver's actual emitted output.

Verification at this head: vitest run services/__tests__/pr-review-state-workflow.test.ts → 209 passed (209); ESLint --max-warnings=0 clean; Prettier clean on both files.

Updated 2026-10-12 (round 6, head `2ce4e3691`)

Addressed the review at 50734f7f6 (1 nitpick thread, resolved): the empty-map test previously drove prState: "closed", conflating the anomalous case. A new emptyOpenList harness option covers exactly that - target open, zero-entry open list - and the test chains resolver-to-shard: resolve emits the unavailable-map output, and the shard consuming that emitted value leaves the existing stacked label untouched while review-state reconciliation still runs.

Verification at this head: vitest run services/__tests__/pr-review-state-workflow.test.ts → 209 passed (209); ESLint --max-warnings=0 clean; Prettier clean.

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.

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753-753: LGTM!

Also applies to: 755-756, 758-758, 761-769, 774-775, 778-778, 798-799

📝 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 remains unchanged. If the relationship cannot be verified, the label is left unchanged and a warning is logged.
- If stacked-label creation or updates fail, other review-state labels continue to be reconciled.

The workflow builds an open-PR-head map and shares it with reconciliation shards. Shards compare each PR’s head commit parents with other open PR heads. They add or remove a separate stacked label before review-state processing.

Changes: Stacked pull request labeling

Layer / File(s)	Summary
Build and share the open-PR head map `.github/workflows/label-pr-review-state.yml`, `src/services/__tests__/pr-review-state-workflow.test.ts`	The resolver reuses the sweep’s open-PR list or fetches one, then passes a lowercase head-SHA map to shards. Tests cover map delivery, reuse, and lookup failure.
Detect and reconcile stacked pull requests `.github/workflows/label-pr-review-state.yml`, `src/services/__tests__/pr-review-state-workflow.test.ts`	Shards add `stacked` when a head commit has exactly one parent matching another open PR’s head, and remove it when that condition is absent. Fork review runs skip mutation. Tests cover label handling and advisory failures.

Priority: ⬇️ Low

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

Change: Feature · Severity of issue fixed: Low

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 resolution
  Workflow->>GitHubAPI: List open pull requests
  GitHubAPI-->>Workflow: Return pull request head SHAs
  Workflow->>Workflow: Build and pass open-PR head map
  Workflow->>GitHubAPI: Read head commit parents
  GitHubAPI-->>Workflow: Return parent SHAs
  Workflow->>GitHubAPI: Add or remove stacked label

Merge Risk: ⚪ Minimal · up to eca78

The reviewed change has no established merge-blocking issue.

Pre-merge checks: 8

Check name	Status	Explanation
Title check		The title clearly summarizes the main change: adding a stacked label so reviewers can filter stacked pull requests.
Description check		The description identifies the linked issue, explains the implementation and behavior, documents test commands and results, and records review updates. It does not reproduce the template headings or c…
Linked Issues check		[`#1945`] The workflow builds an open-PR head map in `resolve` and passes it to reconcile shards. `reconcileStackedLabel` uses `git.getCommit` parent data and requires exactly one parent that matches an…
Out of Scope Changes check		The changed files are `.github/workflows/label-pr-review-state.yml` and `src/services/__tests__/pr-review-state-workflow.test.ts`. The workflow changes implement [`#1945`], including commit-read permiss…
Regression Evidence		Focused regression coverage is present for the changed workflow behavior. The tests cover stacked-label add, stale removal, self-match preservation, merge commits, fork read-only runs, commit lookup f…
Security Boundaries		No changed path meets the security failure conditions. The workflow only reads commit metadata with `github.rest.git.getCommit` and does not check out or execute PR code. The open-PR map contains GitH…
Persistence Integrity		No changed persistence path meets the failure condition. The new `stacked` label creation, add, and removal operations are awaited. Each stacked-label write is followed by local-state update only afte…
Lifecycle Resource Cleanup		No changed lifecycle path leaks a resource or duplicates work after cancellation, disposal, or restart. The workflow additions use finite, awaited GitHub API calls and in-memory maps. The stacked-labe…

Full details: Description check

Explanation

The description identifies the linked issue, explains the implementation and behavior, documents test commands and results, and records review updates. It does not reproduce the template headings or checklist, but the required information is mostly present.

Full details: Linked Issues check

Explanation

[#1945] The workflow builds an open-PR head map in resolve and passes it to reconcile shards. reconcileStackedLabel uses git.getCommit parent data and requires exactly one parent that matches another open PR head. The stacked definition is separate from review-state labels, and review-state reconciliation does not remove it. The workflow removes stale labels when no qualifying parent exists. An unavailable or empty map leaves stacked unchanged, logs a warning, and still runs review-state reconciliation. Commit lookup and stacked-label mutation failures are advisory. The tests cover detection, stale removal, fail-soft behavior, label separation, resolver-to-shard delivery, and fork handling.

Full details: Out of Scope Changes check

Explanation

The changed files are .github/workflows/label-pr-review-state.yml and src/services/__tests__/pr-review-state-workflow.test.ts. The workflow changes implement [#1945], including commit-read permission, open-PR map reuse, stacked-label provisioning, and separate reconciliation. The test changes cover the required behavior and update assertions for the new label and reads. No unrelated production behavior or unrelated files are identified.

Full details: Regression Evidence

Explanation

Focused regression coverage is present for the changed workflow behavior. The tests cover stacked-label add, stale removal, self-match preservation, merge commits, fork read-only runs, commit lookup failure, map lookup failure, add/remove failures, label creation failure, resolver map reuse, empty maps, and resolver-to-shard wiring. They also verify the contents: read permission and stacked label definition. This is workflow metadata behavior, not an application UI change, so a Playwright component snapshot is not required.

Full details: Security Boundaries

Explanation

No changed path meets the security failure conditions. The workflow only reads commit metadata with github.rest.git.getCommit and does not check out or execute PR code. The open-PR map contains GitHub API SHA/number data, is passed as JSON, and is used only to decide the fixed stacked label mutation. Fork review runs retain the read-only guard before stacked-label changes. The added contents: read permission is limited to metadata access.

Full details: Persistence Integrity

Explanation

No changed persistence path meets the failure condition. The new stacked label creation, add, and removal operations are awaited. Each stacked-label write is followed by local-state update only after the API call succeeds, and failures are caught with warnings so the next run can retry. The open-PR head map is awaited, explicitly emitted, and passed to shards through OPEN_PR_HEADS; unavailable maps preserve existing labels. No unawaited write, missing partial-failure handling, or unpropagated persisted default is present.

Full details: Lifecycle Resource Cleanup

Explanation

No changed lifecycle path leaks a resource or duplicates work after cancellation, disposal, or restart. The workflow additions use finite, awaited GitHub API calls and in-memory maps. The stacked-label helper performs one commit lookup and one optional label mutation, then returns. The resolve job builds the open-PR map once and passes it to shards, which reduces repeated work. The test harness restores the added OPEN_PR_HEADS environment variable in a finally block.

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github-actions · 2026-10-05T17:19:18Z

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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.

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Review comments at @.github/workflows/label-pr-review-state.yml:
- Line 94: Update the description field to state only that the head commit
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contains only this unit.
- Line 588: Update the openPrHeads lookup around buildOpenPrHeads to catch and
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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.

CR review at bb7295f, thread 1: a pulls.list that returns zero entries would serialize as {} - a non-null empty map the shard could decide from, removing a valid stacked label with no known parent relationship. Since the reconciliation target itself is open, a zero-entry list is anomalous: resolve now emits an empty output in that case and shards keep the fail-soft (label unchanged). Thread 2: added the resolver-to-shard contract test - the shard consumes the actual open_pr_heads output through the declared OPEN_PR_HEADS env wiring, which the test asserts by name. 209/207 tests pass (two new); eslint 0; prettier clean.

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.github/workflows/label-pr-review-state.yml (1)

212-215: LGTM!

CR nitpick at 50734f7: the empty-map test drove prState closed, conflating the anomalous case (open target, zero-entry open list). New emptyOpenList harness option covers exactly that: resolve emits the unavailable-map output, and the shard - consuming the emitted value - leaves the existing stacked label untouched while review-state reconciliation still runs. 209/209 tests; eslint 0; prettier clean.

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parent and mapped to the current PR, and assert addLabels does not receive
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344-344: 🎯 Functional Correctness | ⚡ Quick win

Do not describe the PR diff in the label description.

The detection reads only the commit graph. It never checks the PR base. If the child PR targets main while its parent PR is open, the GitHub diff includes both units. The description therefore states a guarantee that the workflow does not check.

The code comment at lines 478-483 now says the label describes only the detected relationship. Make the label description match. For example: "Head commit directly descends from another open PR's head". Update the description assertion in src/services/__tests__/pr-review-state-workflow.test.ts (lines 943-948) to the same text.

This repeats an earlier review finding. The code comment was fixed, but the user-visible label text was not.

src/services/__tests__/pr-review-state-workflow.test.ts: 2

730-855: LGTM!

2533-2626: LGTM!

The open-PR head map can predate a push to the PR being reconciled, so a parent sha can resolve to the PR itself. A self-match is not a parent PR: the label is left untouched instead of marking the PR stacked on its own old head. Adds the regression test the review suggested.

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Review comments at @.github/workflows/label-pr-review-state.yml:
- Line 503: Update the stacked-label handling around parentPr so a self-match
(matchedPr equals pr.number) skips all stacked-label mutations and leaves an
existing label untouched; add or update the test to start with labels:
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A self-match means the open-PR map still lists this PR own previous head, which is not evidence that a current stacked relationship is stale. Returning before any mutation keeps an existing label untouched instead of letting the removal branch delete it. Tests: an existing stacked label survives a self-match run, and a valid stacked label survives review-state reconciliation. Workflow suite 236 passed.

easonLiangWorldedtech · 2026-10-22T20:28:20Z

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easonLiangWorldedtech · 2026-10-22T20:29:33Z

Regression Evidence row is already covered at the current head

The warning asks for a runWorkflow assertion that a valid stacked relationship keeps its stacked label through review-state reconciliation. That test is in this head (bb4ef327e) as keeps a valid stacked label through review-state reconciliation in src/services/__tests__/pr-review-state-workflow.test.ts:

it starts with labels: ["stacked", "awaiting-maintainer"] and commitParents: [OLD_SHA] + openPrHeads: [{ number: 1436, sha: OLD_SHA }] (a valid stacked relationship);
it runs a maintainer APPROVED review so the review-state turn has work to do;
it asserts removeLabel was never called for stacked and that the pull request still carries the stacked label afterwards.

Together with the self-match tests (an existing label survives a map that predates a push, and no mutation happens on a self-match), the stale-removal case and the add case, the workflow's stacked-label contract is covered both ways. Workflow suite 236 passed; the current head is fully green (6/6 required checks).

Please re-run the pre-merge checks against bb4ef327e.

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Review comments at @src/services/__tests__/pr-review-state-workflow.test.ts:
- Line 753: Update the self-match test “leaves an existing stacked label
untouched on a self-match” to include an approved maintainer review and the
awaiting-maintainer label, then assert reconciliation removes
awaiting-maintainer while preserving stacked. Add the same removal assertion to
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502-506: LGTM!

…el tests Self-match case now starts with stacked + awaiting-maintainer and a maintainer approval, and asserts awaiting-maintainer is removed while stacked remains; the valid-parent reconciliation test gains the same removal assertion. Workflow suite 236 passed.

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

Open

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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easonLiangWorldedtech added 2 commits October 23, 2026 01:05

Merge upstream/main into feat/label-stacked-prs

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chore: retrigger CI (compile check stayed in progress after the merge…

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Updated 2026-10-11 (head `980566f95`)

Updated 2026-10-11 (round 2, head `2be3bcba5`)

Updated 2026-10-11 (round 3, head `4f4197345`)

Updated 2026-10-12 (round 4, head `bb7295f41`)

Updated 2026-10-12 (round 5, head `50734f7f6`)

Updated 2026-10-12 (round 6, head `2ce4e3691`)

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