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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src/services/__tests__/pr-review-state-workflow.test.ts (1)

85-85: LGTM!

Also applies to: 148-148, 2173-2173, 2176-2177, 2180-2180, 2181-2182, 2183-2202

📝 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 or a label operation fails, a warning is logged.
- Review-state labels continue to be reconciled independently if stacked-label reconciliation encounters an error.

📝 Summary

Walkthrough

The workflow builds an open-PR-head map and shares it with reconciliation shards. Shards compare each PR’s head commit parent 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 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 otherwise. Fork review runs skip mutation. Label provisioning, commit lookup, and label mutation failures follow the described warning behavior.

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 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 2ce4e

No actionable issue remains identified for this change; it is mergeable after normal checks.

Pre-merge checks | 8

✅ Passed checks (8 passed)

Check name	Status	Explanation
Linked Issues check		For [`#1945`], the reported workflow adds a separate `stacked` label definition and reconciliation path. It uses the commit graph and requires exactly one parent matching another open PR head. It remove…
Out of Scope Changes check		The reported changes are limited to `.github/workflows/label-pr-review-state.yml` and `src/services/__tests__/pr-review-state-workflow.test.ts`. The permission, resolver-to-shard map transport, fail-s…
Regression Evidence		Focused coverage is present for the changed workflow behavior. The tests cover stacked-label addition, stale removal, the exactly-one-parent rule including merge commits, fork read-only behavior, comm…
Security Boundaries		No changed path meets the security failure conditions. The workflow adds only `contents: read` for a metadata-only `git.getCommit` call, and it does not check out or execute PR code. The new `OPEN_PR_…
Persistence Integrity		No changed persistence path meets the failure condition. The resolver awaits the open-PR read before emitting `open_pr_heads`, and the shard consumes that output before reconciliation. The new `create…
Lifecycle Resource Cleanup		No changed lifecycle path leaks a resource or duplicates work after cancellation, disposal, or restart. The workflow additions use finite `await` calls for the open-PR map, commit lookup, and label up…
Title check		The title clearly and concisely describes the main change: adding a stacked pull request label for reviewer filtering.
Description check		The description identifies issue `#1945`, explains the implementation and design choices, documents the test procedure and results, and records review updates. It does not reproduce all template section…

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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
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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Review comments at @src/services/__tests__/pr-review-state-workflow.test.ts:
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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.

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

294-294: The label description still promises a one-unit diff.

A child PR can target main while its head descends from another open PR’s head. Its diff can then include both units. The earlier review already requested a description limited to the detected commit relationship; update this description and the matching test assertion. (docs.github.com)

CR review at 4f41973: with main's sharding, every reconcile shard built the open-PR head map itself, multiplying the paginated pulls.list read by the shard count against the Actions token budget (a 201-300 open-PR sweep adds ~600 calls). - resolve builds the map once and exports it as the open_pr_heads output; the sweep branch reuses the open list it already paged, so sweeps pay zero extra reads and direct events pay exactly one. - shards parse the map from the OPEN_PR_HEADS env. An empty or unparseable value keeps the existing fail-soft: reconcileStackedLabel skips label mutation rather than deciding from an empty map. - buildOpenPrHeads is gone from the reconcile script. Tests: harness passes the map through the env like the matrix wiring does; new resolve-level tests cover the sweep reuse and the fail-soft output; shard tests assert zero pull-request reads. 207/207 pass; eslint 0; prettier clean.

easonLiangWorldedtech · 2026-10-12T16:14:43Z

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Inline comments:
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- Line 212: Update the resolver that assigns openPrHeadsOutput so an empty heads
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data distinct from a known empty map. Add a resolver-to-shard test confirming
this case leaves an existing stacked label unchanged.

Review comments at @src/services/__tests__/pr-review-state-workflow.test.ts:
- Around line 526-528: Add a contract test that passes the actual
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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.

easonLiangWorldedtech · 2026-10-12T17:19:04Z

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Review comments at @src/services/__tests__/pr-review-state-workflow.test.ts:
- Around line 2167-2172: Update the test harness used by runResolve to support
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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.

easonLiangWorldedtech · 2026-10-12T17:37:44Z

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easonLiangWorldedtech · 2026-10-12T19:11:15Z

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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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What changes

Tests

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)

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

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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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