CI: shard Windows test lane for faster CI critical path (#27234)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: f7c41089e0
Co-authored-by: joshavant <830519+joshavant@users.noreply.github.com>
Co-authored-by: joshavant <830519+joshavant@users.noreply.github.com>
Reviewed-by: @joshavant

.github/workflows/ci.yml

@@ -418,12 +418,23 @@ jobs:
         include:
           - runtime: node
             task: lint
+            shard_index: 0
+            shard_count: 1
             command: pnpm lint
           - runtime: node
             task: test
+            shard_index: 1
+            shard_count: 2
+            command: pnpm canvas:a2ui:bundle && pnpm test
+          - runtime: node
+            task: test
+            shard_index: 2
+            shard_count: 2
             command: pnpm canvas:a2ui:bundle && pnpm test
           - runtime: node
             task: protocol
+            shard_index: 0
+            shard_count: 1
             command: pnpm protocol:check
     steps:
       - name: Checkout
@@ -495,6 +506,12 @@ jobs:
           pnpm -v
           pnpm install --frozen-lockfile --ignore-scripts=false --config.engine-strict=false --config.enable-pre-post-scripts=true || pnpm install --frozen-lockfile --ignore-scripts=false --config.engine-strict=false --config.enable-pre-post-scripts=true
 
+      - name: Configure test shard (Windows)
+        if: matrix.task == 'test'
+        run: |
+          echo "OPENCLAW_TEST_SHARDS=${{ matrix.shard_count }}" >> "$GITHUB_ENV"
+          echo "OPENCLAW_TEST_SHARD_INDEX=${{ matrix.shard_index }}" >> "$GITHUB_ENV"
+
       - name: Configure vitest JSON reports
         if: matrix.task == 'test'
         run: echo "OPENCLAW_VITEST_REPORT_DIR=$RUNNER_TEMP/vitest-reports" >> "$GITHUB_ENV"
@@ -512,7 +529,7 @@ jobs:
         if: matrix.task == 'test'
         uses: actions/upload-artifact@v4
         with:
-          name: vitest-reports-${{ runner.os }}-${{ matrix.runtime }}
+          name: vitest-reports-${{ runner.os }}-${{ matrix.runtime }}-shard${{ matrix.shard_index }}of${{ matrix.shard_count }}
           path: |
             ${{ env.OPENCLAW_VITEST_REPORT_DIR }}
             ${{ runner.temp }}/vitest-slowest.md

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 Docs: https://docs.openclaw.ai
 
+## 2026.2.26 (Unreleased)
+
+### Fixes
+
+- CI/Windows: shard the Windows `checks-windows` test lane into two matrix jobs and honor explicit shard index overrides in `scripts/test-parallel.mjs` to reduce CI critical-path wall time. (#27234) Thanks @joshavant.
+
 ## 2026.2.25
 
 ### Changes

scripts/test-parallel.mjs

@@ -160,11 +160,31 @@ const runs = [
   },
 ];
 const shardOverride = Number.parseInt(process.env.OPENCLAW_TEST_SHARDS ?? "", 10);
-const shardCount = isWindowsCi
-  ? Number.isFinite(shardOverride) && shardOverride > 1
-    ? shardOverride
-    : 2
-  : 1;
+const configuredShardCount =
+  Number.isFinite(shardOverride) && shardOverride > 1 ? shardOverride : null;
+const shardCount = configuredShardCount ?? (isWindowsCi ? 2 : 1);
+const shardIndexOverride = (() => {
+  const parsed = Number.parseInt(process.env.OPENCLAW_TEST_SHARD_INDEX ?? "", 10);
+  return Number.isFinite(parsed) && parsed > 0 ? parsed : null;
+})();
+
+if (shardIndexOverride !== null && shardCount <= 1) {
+  console.error(
+    `[test-parallel] OPENCLAW_TEST_SHARD_INDEX=${String(
+      shardIndexOverride,
+    )} requires OPENCLAW_TEST_SHARDS>1.`,
+  );
+  process.exit(2);
+}
+
+if (shardIndexOverride !== null && shardIndexOverride > shardCount) {
+  console.error(
+    `[test-parallel] OPENCLAW_TEST_SHARD_INDEX=${String(
+      shardIndexOverride,
+    )} exceeds OPENCLAW_TEST_SHARDS=${String(shardCount)}.`,
+  );
+  process.exit(2);
+}
 const windowsCiArgs = isWindowsCi ? ["--dangerouslyIgnoreUnhandledErrors"] : [];
 const silentArgs =
   process.env.OPENCLAW_TEST_SHOW_PASSED_LOGS === "1" ? [] : ["--silent=passed-only"];
@@ -391,6 +411,9 @@ const run = async (entry) => {
   if (shardCount <= 1) {
     return runOnce(entry);
   }
+  if (shardIndexOverride !== null) {
+    return runOnce(entry, ["--shard", `${shardIndexOverride}/${shardCount}`]);
+  }
   for (let shardIndex = 1; shardIndex <= shardCount; shardIndex += 1) {
     // eslint-disable-next-line no-await-in-loop
     const code = await runOnce(entry, ["--shard", `${shardIndex}/${shardCount}`]);