[easonLiangWorldedtech]

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.

Review round (maintainer review, 2026-10-28)

Head 251046072.

• Permissions header comment now states that all unspecified permissions are none, that contents is read-only, and that it exists only for the commit-parent lookup.
• The head map was read on every direct event. Outside the sweep path, reviews, CodeRabbit status comments, workflow_run completions, and manual dispatch each paged the full open-PR list even though none of them can publish a head commit. The resolve job now reads the map only on sweeps (which already hold the open list) and on opened/reopened/synchronize; every other event emits a not-evaluated sentinel. Shards treat the sentinel as "label not evaluated" (info, label untouched) while an empty value still means the read failed (warning). Trade-off: manual dispatch no longer refreshes the stacked label by itself; the next sweep or head-publishing event does.
• Missing test coverage: the accept side of the read-only guard (same-repository review run; fork PR on a writable pull_request_target run) and a non-JSON OPEN_PR_HEADS value reaching the shard's JSON.parse catch.

Verification at 251046072: vitest run services/__tests__/pr-review-state-workflow.test.ts -> 243 passed. Negative controls: always reading the map turns the dispatch/workflow_run tests red; removing the sentinel branch turns the sentinel and dispatch tests red. ESLint --max-warnings=0 clean on the touched test file, tsc --noEmit 0 errors.

Main refresh (2026-10-28)

Merged upstream/main 3f51e9df7 (897ebdd7), 0 behind main, and formatted the touched spec for the compile job's new format:check (no behavior change). Verification after the merge: the three workflow suites 326 passed, tsc --noEmit 0, eslint --max-warnings=0 clean.

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753-753: LGTM!

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📝 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

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Merge Risk: Minimal · previous review 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.
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…
Description check		The PR description is detailed and covers the core intent: it links issue #1945, explains what changes (the stacked label definition, reconciliation separate from review-state labels, stale-label remo…

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.

Full details: Description check

Explanation

The PR description is detailed and covers the core intent: it links issue #1945, explains what changes (the stacked label definition, reconciliation separate from review-state labels, stale-label removal, fail-soft lookups, contents: read), and lists test results and verification commands across several updates. It does not follow the repository template in several places. The 'Pre-Submission Checklist', 'Documentation Updates', 'Additional Notes' and 'Get in Touch' sections are absent. The 'Related GitHub Issue' is written as 'Fixes #1945' rather than the template's 'Closes: #' form. The 'Test Procedure' is partly covered but lacks reviewer repro steps beyond the vitest command. The description also does not state whether visual snapshots apply, though this is a workflow change and likely not a UI change. The description is long and includes a history of update rounds that reduces clarity for a reviewer. The core required information is present, so the check passes, but the template sections should be added or confirmed.

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212-215: LGTM!

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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!

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2533-2626: LGTM!

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- Line 503: Update the stacked-label handling around parentPr so a self-match
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[easonLiangWorldedtech]

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[easonLiangWorldedtech]

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
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502-506: LGTM!

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The maintainer's three review threads are addressed and the branch is refreshed onto main (head 897ebdd). Changes since the last review: permissions header comment corrected; the open-PR head map is read only on sweeps and opened/
eopened/synchronize (a
ot-evaluated sentinel elsewhere); added coverage for the read-only guard's accept side and for a non-JSON OPEN_PR_HEADS value. All three threads are replied to and resolved.

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