diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f26dbaa4a0a..840d582abe3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -365,17 +365,21 @@ jobs:
 
           let extensionFile = "";
           let channelFile = "";
+          let extensionRepresentativeId = "";
+          let channelRepresentativeId = "";
 
-          for (const extensionId of orderedExtensionIds) {
-            const plan = resolveExtensionTestPlan({ targetArg: extensionId, cwd: process.cwd() });
+          for (const candidateId of orderedExtensionIds) {
+            const plan = resolveExtensionTestPlan({ targetArg: candidateId, cwd: process.cwd() });
             if (plan.testFiles.length === 0) {
               continue;
             }
             const firstFile = plan.testFiles[0] ?? "";
             if (!extensionFile && plan.config === "vitest.extensions.config.ts") {
+              extensionRepresentativeId = plan.extensionId;
               extensionFile = firstFile;
             }
             if (!channelFile && plan.config === "vitest.channels.config.ts") {
+              channelRepresentativeId = plan.extensionId;
               channelFile = firstFile;
             }
             if (extensionFile && channelFile) {
@@ -383,29 +387,41 @@ jobs:
             }
           }
 
+          appendFileSync(
+            process.env.GITHUB_OUTPUT,
+            `extension_id=${extensionRepresentativeId}\n`,
+            "utf8",
+          );
+          appendFileSync(
+            process.env.GITHUB_OUTPUT,
+            `channel_id=${channelRepresentativeId}\n`,
+            "utf8",
+          );
           appendFileSync(process.env.GITHUB_OUTPUT, `extension_file=${extensionFile}\n`, "utf8");
           appendFileSync(process.env.GITHUB_OUTPUT, `channel_file=${channelFile}\n`, "utf8");
           EOF
 
       - name: Run extension-fast import precheck
         env:
+          EXTENSION_ID: ${{ steps.representative.outputs.extension_id }}
+          CHANNEL_ID: ${{ steps.representative.outputs.channel_id }}
           EXTENSION_FILE: ${{ steps.representative.outputs.extension_file }}
           CHANNEL_FILE: ${{ steps.representative.outputs.channel_file }}
         run: |
           set -euo pipefail
           precheck_start="$(date +%s)"
 
-          if [ -n "$EXTENSION_FILE" ]; then
-            echo "Running extensions precheck: $EXTENSION_FILE"
-            pnpm exec vitest run --config vitest.extensions.config.ts --pool=forks --maxWorkers=1 --bail=1 "$EXTENSION_FILE"
+          if [ -n "$EXTENSION_ID" ]; then
+            echo "Running extensions plan precheck: $EXTENSION_ID"
+            pnpm test:extension "$EXTENSION_ID" --allow-empty --dry-run --json > /dev/null
           fi
 
-          if [ -n "$CHANNEL_FILE" ]; then
-            echo "Running channels precheck: $CHANNEL_FILE"
-            pnpm exec vitest run --config vitest.channels.config.ts --pool=forks --maxWorkers=1 --bail=1 "$CHANNEL_FILE"
+          if [ -n "$CHANNEL_ID" ]; then
+            echo "Running channels plan precheck: $CHANNEL_ID"
+            pnpm test:extension "$CHANNEL_ID" --allow-empty --dry-run --json > /dev/null
           fi
 
-          if [ -z "$EXTENSION_FILE" ] && [ -z "$CHANNEL_FILE" ]; then
+          if [ -z "$EXTENSION_ID" ] && [ -z "$CHANNEL_ID" ]; then
             echo "::warning::extension-fast precheck found no representative test files."
           fi
 
@@ -413,6 +429,8 @@ jobs:
           precheck_duration="$((precheck_end - precheck_start))"
           {
             echo "### extension-fast-precheck"
+            echo "- extension id: ${EXTENSION_ID:-none}"
+            echo "- channel id: ${CHANNEL_ID:-none}"
             echo "- extension file: ${EXTENSION_FILE:-none}"
             echo "- channel file: ${CHANNEL_FILE:-none}"
             echo "- duration: ${precheck_duration}s"