diff --git a/.github/scripts/query-regression-comment.cjs b/.github/scripts/query-regression-comment.cjs
index 6f4386fc3b..130b1c7efa 100644
--- a/.github/scripts/query-regression-comment.cjs
+++ b/.github/scripts/query-regression-comment.cjs
@@ -48,7 +48,7 @@ function text(value) {
     .replace(/!/g, '\\!')
     .replace(/@/g, '@\u200b')
     .replace(/\|/g, '\\|')
-    .replace(/\r?\n/g, ' ');
+    .replace(/\r\n|\r|\n/g, ' ');
   return result;
 }
 
@@ -56,9 +56,20 @@ function statusEmoji(status) {
   return { ok: '✅', measured: '✅', failed: '❌', planned: '📝', 'fixture-ready': '🧪' }[status] || '⚠️';
 }
 
-function fmtMs(value) {
+function finiteNumber(value) {
+  if (typeof value !== 'number' && typeof value !== 'string') {
+    return null;
+  }
+  if (typeof value === 'string' && value.trim() === '') {
+    return null;
+  }
   const number = Number(value);
-  return Number.isFinite(number) ? number.toFixed(2) : 'N/A';
+  return Number.isFinite(number) ? number : null;
+}
+
+function fmtMs(value) {
+  const number = finiteNumber(value);
+  return number === null ? 'N/A' : number.toFixed(2);
 }
 
 function measurementsByName(target) {
@@ -71,51 +82,177 @@ function measurementsByName(target) {
 }
 
 function regression(base, candidate) {
-  const b = Number(base);
-  const c = Number(candidate);
-  if (!Number.isFinite(b) || !Number.isFinite(c) || b === 0) return 'N/A';
+  const b = finiteNumber(base);
+  const c = finiteNumber(candidate);
+  if (b === null || c === null || b === 0) return 'N/A';
   return `${(((c - b) / b) * 100).toFixed(1)}%`;
 }
 
-function renderReport(report, reportPath) {
+function thresholdStatus(thresholds, query) {
+  const hits = (Array.isArray(thresholds) ? thresholds : [])
+    .filter(item => query === undefined || (hasScopedQuery(item) && String(item.query) === query))
+    .map(formatThreshold);
+  return hits.length > 0 ? hits.join(', ') : 'N/A';
+}
+
+function hasScopedQuery(threshold) {
+  return threshold?.query !== null
+    && threshold?.query !== undefined
+    && String(threshold.query) !== '';
+}
+
+function hasValue(value) {
+  return value !== null && value !== undefined && String(value) !== '';
+}
+
+function formatThreshold(threshold) {
+  const scope = [];
+  if (hasValue(threshold?.target)) scope.push(`target=${threshold.target}`);
+  if (hasValue(threshold?.encoding)) scope.push(`encoding=${threshold.encoding}`);
+  const name = threshold?.threshold || 'threshold';
+  const status = threshold?.status || 'unknown';
+  const reason = hasValue(threshold?.reason) ? ` (reason: ${threshold.reason})` : '';
+  return `${name}${scope.length > 0 ? ` [${scope.join(', ')}]` : ''}: ${status}${reason}`;
+}
+
+function syntheticThresholdStatus(thresholds, measurementNames) {
+  const unscoped = [];
+  const unmatched = new Map();
+  for (const threshold of Array.isArray(thresholds) ? thresholds : []) {
+    if (!hasScopedQuery(threshold)) {
+      unscoped.push(threshold);
+      continue;
+    }
+    const query = String(threshold.query);
+    if (!measurementNames.has(query)) {
+      const entries = unmatched.get(query) || [];
+      entries.push(threshold);
+      unmatched.set(query, entries);
+    }
+  }
+
+  const parts = [];
+  if (unscoped.length > 0) {
+    parts.push(`case/storage threshold: ${thresholdStatus(unscoped)}`);
+  }
+  for (const query of Array.from(unmatched.keys()).sort()) {
+    parts.push(`unmatched query ${query}: ${thresholdStatus(unmatched.get(query))}`);
+  }
+  return parts.length > 0 ? parts.join('; ') : 'N/A';
+}
+
+function joinDetails(...details) {
+  const present = details.filter(detail => detail && detail !== 'N/A');
+  return present.length > 0 ? present.join('; ') : 'N/A';
+}
+
+function missingMeasurementDetails(base, candidate) {
+  const details = [];
+  if (finiteNumber(base?.latency_ms_median) === null) details.push('base measurement missing');
+  if (finiteNumber(candidate?.latency_ms_median) === null) details.push('candidate measurement missing');
+  return details;
+}
+
+function collectReportRows(report, reportPath) {
+  const fallbackName = typeof reportPath === 'string'
+    ? path.basename(path.dirname(reportPath)) || 'unknown'
+    : 'unknown';
+  if (report === null || Array.isArray(report) || typeof report !== 'object') {
+    return [{
+      caseName: fallbackName,
+      query: 'N/A',
+      status: 'missing',
+      baseMedian: 'N/A',
+      candidateMedian: 'N/A',
+      regression: 'N/A',
+      threshold: 'invalid report object',
+    }];
+  }
   const caseInfo = report.case || {};
-  const name = caseInfo.name || path.basename(path.dirname(reportPath));
+  const name = caseInfo.name || fallbackName;
   const status = report.status || 'missing';
-  const lines = [
-    `### ${statusEmoji(status)} ${text(name)}`,
-    '',
-    `- **Status:** \`${text(status)}\``,
-    `- **Case path:** \`${text(report.case_path)}\``,
-    `- **Query mode:** \`${text(report.query_mode)}\``,
-  ];
+  const thresholds = Array.isArray(report.thresholds) ? report.thresholds : [];
   if (report.error) {
-    lines.push(`- **Error:** \`${text(report.error)}\``);
+    return [{
+      caseName: name,
+      query: 'N/A',
+      status,
+      baseMedian: 'N/A',
+      candidateMedian: 'N/A',
+      regression: 'N/A',
+      threshold: joinDetails(`error: ${report.error}`, syntheticThresholdStatus(thresholds, new Set())),
+    }];
   }
 
   const targets = Array.isArray(report.targets) ? report.targets : [];
-  lines.push('', '| Target | Status | Validation errors | Region |', '| --- | --- | ---: | --- |');
-  for (const target of targets) {
-    const discovered = target?.discovered || {};
-    const region = Array.isArray(discovered)
-      ? discovered.map(item => item?.region_id).filter(Boolean).join(', ')
-      : discovered.region_id;
-    lines.push(
-      `| ${text(target?.name)} | ${statusEmoji(target?.status)} \`${text(target?.status)}\` | ${(target?.validation_errors || []).length} | ${text(region)} |`
-    );
+  if (targets.length < 2) {
+    return [{
+      caseName: name,
+      query: 'N/A',
+      status,
+      baseMedian: 'N/A',
+      candidateMedian: 'N/A',
+      regression: 'N/A',
+      threshold: joinDetails('base/candidate measurements missing', syntheticThresholdStatus(thresholds, new Set())),
+    }];
   }
 
-  if (targets.length >= 2) {
-    const base = measurementsByName(targets[0]);
-    const candidate = measurementsByName(targets[1]);
-    const names = Array.from(new Set([...base.keys(), ...candidate.keys()])).sort();
-    lines.push('', '| Query | Base median ms | Candidate median ms | Regression |', '| --- | ---: | ---: | ---: |');
-    for (const query of names) {
-      const b = base.get(query) || {};
-      const c = candidate.get(query) || {};
-      lines.push(
-        `| ${text(query)} | ${fmtMs(b.latency_ms_median)} | ${fmtMs(c.latency_ms_median)} | ${regression(b.latency_ms_median, c.latency_ms_median)} |`
-      );
-    }
+  const base = measurementsByName(targets[0]);
+  const candidate = measurementsByName(targets[1]);
+  const names = Array.from(new Set([...base.keys(), ...candidate.keys()])).sort();
+  if (names.length === 0) {
+    return [{
+      caseName: name,
+      query: 'N/A',
+      status,
+      baseMedian: 'N/A',
+      candidateMedian: 'N/A',
+      regression: 'N/A',
+      threshold: joinDetails('no query measurements found', syntheticThresholdStatus(thresholds, new Set())),
+    }];
+  }
+
+  const measurementNames = new Set(names);
+  const rows = names.map(query => {
+    const b = base.get(query) || {};
+    const c = candidate.get(query) || {};
+    return {
+      caseName: name,
+      query,
+      status,
+      baseMedian: fmtMs(b.latency_ms_median),
+      candidateMedian: fmtMs(c.latency_ms_median),
+      regression: regression(b.latency_ms_median, c.latency_ms_median),
+      threshold: joinDetails(
+        ...missingMeasurementDetails(b, c),
+        thresholdStatus(thresholds, query)
+      ),
+    };
+  });
+  const syntheticThresholds = syntheticThresholdStatus(thresholds, measurementNames);
+  if (syntheticThresholds !== 'N/A') {
+    rows.push({
+      caseName: name,
+      query: 'N/A',
+      status,
+      baseMedian: 'N/A',
+      candidateMedian: 'N/A',
+      regression: 'N/A',
+      threshold: syntheticThresholds,
+    });
+  }
+  return rows;
+}
+
+function renderSummaryTable(rows) {
+  const lines = [
+    '| Case | Query | Case status | Base median ms | Candidate median ms | Regression | Threshold |',
+    '| --- | --- | --- | ---: | ---: | ---: | --- |',
+  ];
+  for (const row of rows) {
+    lines.push(
+      `| ${text(row.caseName)} | ${text(row.query)} | ${statusEmoji(row.status)} \`${text(row.status)}\` | ${text(row.baseMedian)} | ${text(row.candidateMedian)} | ${text(row.regression)} | ${text(row.threshold)} |`
+    );
   }
   return lines.join('\n');
 }
@@ -251,7 +388,7 @@ module.exports = async function validateQueryRegressionComment({ github, context
   if (reportPaths.length === 0) {
     body += 'No query-regression JSON reports were found in the artifact.\n';
   } else {
-    const rendered = [];
+    const rows = [];
     for (const reportPath of reportPaths) {
       let report;
       try {
@@ -259,9 +396,9 @@ module.exports = async function validateQueryRegressionComment({ github, context
       } catch (error) {
         return skip(core, `Invalid report JSON in ${reportPath}: ${error.message}`);
       }
-      rendered.push(renderReport(report, reportPath));
+      rows.push(...collectReportRows(report, reportPath));
     }
-    body += rendered.join('\n\n---\n\n') + '\n';
+    body += renderSummaryTable(rows) + '\n';
   }
 
   fs.writeFileSync(summaryPath, body);
@@ -270,3 +407,5 @@ module.exports = async function validateQueryRegressionComment({ github, context
   core.setOutput('pr_number', String(prNumber));
   core.setOutput('summary_path', summaryPath);
 };
+
+module.exports._test = { collectReportRows, renderSummaryTable };
diff --git a/.github/scripts/query-regression-comment.test.cjs b/.github/scripts/query-regression-comment.test.cjs
new file mode 100644
index 0000000000..7a74a0d88c
--- /dev/null
+++ b/.github/scripts/query-regression-comment.test.cjs
@@ -0,0 +1,338 @@
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+const handler = require('./query-regression-comment.cjs');
+const { collectReportRows, renderSummaryTable } = handler._test;
+
+function report(name, measurements, thresholds = []) {
+  return {
+    case: { name },
+    status: 'ok',
+    targets: [
+      { measurements: measurements.base },
+      { measurements: measurements.candidate },
+    ],
+    thresholds,
+  };
+}
+
+test('keeps the default export callable and exposes only the test seam', () => {
+  assert.equal(typeof handler, 'function');
+  assert.equal(handler.constructor.name, 'AsyncFunction');
+  assert.deepEqual(Object.keys(handler._test).sort(), ['collectReportRows', 'renderSummaryTable']);
+});
+
+test('renders every case in one summary table without per-case separators', () => {
+  const rows = [
+    ...collectReportRows(report('first', {
+      base: [{ name: 'q1', latency_ms_median: 10 }],
+      candidate: [{ name: 'q1', latency_ms_median: 11 }],
+    }), '/reports/first/query-regression-report.json'),
+    ...collectReportRows(report('second', {
+      base: [{ name: 'q2', latency_ms_median: 20 }],
+      candidate: [{ name: 'q2', latency_ms_median: 18 }],
+    }), '/reports/second/query-regression-report.json'),
+  ];
+
+  const table = renderSummaryTable(rows);
+
+  assert.equal((table.match(/^\| Case \| Query \| Case status \|/gm) || []).length, 1);
+  assert.match(table, /\| first \| q1 \|/);
+  assert.match(table, /\| second \| q2 \|/);
+  assert.doesNotMatch(table, /^### /m);
+  assert.doesNotMatch(table, /^---$/m);
+});
+
+test('renders failed reports as N/A rows with their error', () => {
+  const rows = collectReportRows({
+    case: { name: 'broken' },
+    status: 'failed',
+    error: 'connection refused',
+  }, '/reports/broken/query-regression-report.json');
+
+  assert.deepEqual(rows, [{
+    caseName: 'broken',
+    query: 'N/A',
+    status: 'failed',
+    baseMedian: 'N/A',
+    candidateMedian: 'N/A',
+    regression: 'N/A',
+    threshold: 'error: connection refused',
+  }]);
+});
+
+test('reports missing targets and empty measurements', () => {
+  const missingTargets = collectReportRows({ case: { name: 'missing' }, status: 'failed' }, '/reports/missing/report.json');
+  const emptyMeasurements = collectReportRows(report('empty', { base: [], candidate: [] }), '/reports/empty/report.json');
+
+  assert.equal(missingTargets[0].threshold, 'base/candidate measurements missing');
+  assert.equal(emptyMeasurements[0].threshold, 'no query measurements found');
+});
+
+test('renders null, array, and primitive reports as invalid report rows', () => {
+  for (const invalidReport of [null, [], 'not an object']) {
+    assert.deepEqual(
+      collectReportRows(invalidReport, '/reports/fallback/query-regression-report.json'),
+      [{
+        caseName: 'fallback',
+        query: 'N/A',
+        status: 'missing',
+        baseMedian: 'N/A',
+        candidateMedian: 'N/A',
+        regression: 'N/A',
+        threshold: 'invalid report object',
+      }]
+    );
+  }
+});
+
+test('rejects null medians and diagnoses missing asymmetric measurements', () => {
+  const rows = collectReportRows(report('missing-values', {
+    base: [
+      { name: 'null-median', latency_ms_median: null },
+      { name: 'base-only', latency_ms_median: 10 },
+      { name: 'candidate-null', latency_ms_median: 20 },
+    ],
+    candidate: [
+      { name: 'null-median', latency_ms_median: 20 },
+      { name: 'candidate-null', latency_ms_median: null },
+      { name: 'candidate-only', latency_ms_median: 30 },
+    ],
+  }), '/reports/missing-values/query-regression-report.json');
+  const byQuery = new Map(rows.map(row => [row.query, row]));
+
+  assert.equal(byQuery.get('null-median').baseMedian, 'N/A');
+  assert.equal(byQuery.get('null-median').candidateMedian, '20.00');
+  assert.equal(byQuery.get('null-median').regression, 'N/A');
+  assert.equal(byQuery.get('null-median').threshold, 'base measurement missing');
+  assert.equal(byQuery.get('base-only').threshold, 'candidate measurement missing');
+  assert.equal(byQuery.get('candidate-null').candidateMedian, 'N/A');
+  assert.equal(byQuery.get('candidate-null').regression, 'N/A');
+  assert.equal(byQuery.get('candidate-null').threshold, 'candidate measurement missing');
+  assert.equal(byQuery.get('candidate-only').threshold, 'base measurement missing');
+});
+
+test('rejects empty, blank, NaN, and infinite medians', () => {
+  const rows = collectReportRows(report('invalid-values', {
+    base: [
+      { name: 'empty-base', latency_ms_median: '' },
+      { name: 'blank-base', latency_ms_median: '   ' },
+      { name: 'nan-candidate', latency_ms_median: 10 },
+      { name: 'infinite-candidate', latency_ms_median: 10 },
+    ],
+    candidate: [
+      { name: 'empty-base', latency_ms_median: 10 },
+      { name: 'blank-base', latency_ms_median: 10 },
+      { name: 'nan-candidate', latency_ms_median: Number.NaN },
+      { name: 'infinite-candidate', latency_ms_median: Number.POSITIVE_INFINITY },
+    ],
+  }), '/reports/invalid-values/query-regression-report.json');
+  const byQuery = new Map(rows.map(row => [row.query, row]));
+
+  for (const query of ['empty-base', 'blank-base', 'nan-candidate', 'infinite-candidate']) {
+    assert.equal(byQuery.get(query).regression, 'N/A');
+  }
+  assert.equal(byQuery.get('empty-base').baseMedian, 'N/A');
+  assert.equal(byQuery.get('blank-base').baseMedian, 'N/A');
+  assert.equal(byQuery.get('nan-candidate').candidateMedian, 'N/A');
+  assert.equal(byQuery.get('infinite-candidate').candidateMedian, 'N/A');
+});
+
+test('rejects boolean, array, and object median coercions', () => {
+  const rows = collectReportRows(report('invalid-types', {
+    base: [
+      { name: 'boolean-base', latency_ms_median: true },
+      { name: 'array-base', latency_ms_median: [] },
+      { name: 'object-base', latency_ms_median: {} },
+      { name: 'boolean-candidate', latency_ms_median: 10 },
+      { name: 'array-candidate', latency_ms_median: 10 },
+      { name: 'object-candidate', latency_ms_median: 10 },
+    ],
+    candidate: [
+      { name: 'boolean-base', latency_ms_median: 10 },
+      { name: 'array-base', latency_ms_median: 10 },
+      { name: 'object-base', latency_ms_median: 10 },
+      { name: 'boolean-candidate', latency_ms_median: false },
+      { name: 'array-candidate', latency_ms_median: [] },
+      { name: 'object-candidate', latency_ms_median: {} },
+    ],
+  }), '/reports/invalid-types/query-regression-report.json');
+
+  for (const row of rows) {
+    assert.equal(row.regression, 'N/A');
+  }
+  assert.equal(rows.find(row => row.query === 'boolean-base').baseMedian, 'N/A');
+  assert.equal(rows.find(row => row.query === 'array-base').baseMedian, 'N/A');
+  assert.equal(rows.find(row => row.query === 'object-base').baseMedian, 'N/A');
+  assert.equal(rows.find(row => row.query === 'boolean-candidate').candidateMedian, 'N/A');
+  assert.equal(rows.find(row => row.query === 'array-candidate').candidateMedian, 'N/A');
+  assert.equal(rows.find(row => row.query === 'object-candidate').candidateMedian, 'N/A');
+});
+
+test('sorts the base and candidate query union and aggregates scoped thresholds', () => {
+  const rows = collectReportRows(report('union', {
+    base: [{ name: 'z', latency_ms_median: 10 }],
+    candidate: [{ name: 'a', latency_ms_median: 20 }],
+  }, [
+    { query: 'z', threshold: 'p95', target: 'base', status: 'warn' },
+    { query: 'z', threshold: 'absolute', target: 'candidate', encoding: 'plain', status: 'pass' },
+  ]), '/reports/union/query-regression-report.json');
+
+  assert.deepEqual(rows.map(row => row.query), ['a', 'z']);
+  assert.equal(rows[0].baseMedian, 'N/A');
+  assert.equal(rows[0].candidateMedian, '20.00');
+  assert.equal(rows[0].threshold, 'base measurement missing');
+  assert.equal(
+    rows[1].threshold,
+    'candidate measurement missing; p95 [target=base]: warn, absolute [target=candidate, encoding=plain]: pass'
+  );
+});
+
+test('preserves unscoped and unmatched thresholds in a synthetic N/A row', () => {
+  const rows = collectReportRows(report('thresholds', {
+    base: [{ name: 'measured', latency_ms_median: 10 }],
+    candidate: [{ name: 'measured', latency_ms_median: 11 }],
+  }, [
+    { query: 'measured', threshold: 'query limit', target: 'base', status: 'passed' },
+    { threshold: 'min_files', target: 'base', status: 'passed' },
+    { threshold: 'min_files', target: 'candidate', status: 'failed' },
+    { threshold: 'encoding limit', target: 'candidate', encoding: 'plain', status: 'failed' },
+    {
+      query: 'not-measured',
+      threshold: 'orphaned limit',
+      target: 'base',
+      encoding: 'json',
+      status: 'failed',
+      reason: 'measurement unavailable',
+    },
+  ]), '/reports/thresholds/query-regression-report.json');
+
+  assert.equal(rows.length, 2);
+  assert.equal(rows[0].query, 'measured');
+  assert.equal(rows[0].threshold, 'query limit [target=base]: passed');
+  assert.equal(rows[1].query, 'N/A');
+  assert.equal(
+    rows[1].threshold,
+    'case/storage threshold: min_files [target=base]: passed, min_files [target=candidate]: failed, encoding limit [target=candidate, encoding=plain]: failed; unmatched query not-measured: orphaned limit [target=base, encoding=json]: failed (reason: measurement unavailable)'
+  );
+});
+
+test('keeps unscoped thresholds out of undefined and null query rows', () => {
+  const rows = collectReportRows(report('collisions', {
+    base: [
+      { name: 'undefined', latency_ms_median: 10 },
+      { name: 'null', latency_ms_median: 10 },
+    ],
+    candidate: [
+      { name: 'undefined', latency_ms_median: 11 },
+      { name: 'null', latency_ms_median: 11 },
+    ],
+  }, [
+    { threshold: 'min_files', target: 'base', status: 'passed' },
+    { query: null, threshold: 'min_files', target: 'candidate', status: 'failed' },
+  ]), '/reports/collisions/query-regression-report.json');
+  const byQuery = new Map(rows.map(row => [row.query, row]));
+
+  assert.equal(byQuery.get('undefined').threshold, 'N/A');
+  assert.equal(byQuery.get('null').threshold, 'N/A');
+  assert.equal(rows.filter(row => row.query === 'N/A').length, 1);
+  assert.equal(
+    byQuery.get('N/A').threshold,
+    'case/storage threshold: min_files [target=base]: passed, min_files [target=candidate]: failed'
+  );
+});
+
+test('escapes Markdown table content, including bare carriage returns', () => {
+  const table = renderSummaryTable([{
+    caseName: 'safe\r| injected |\n<!-- hidden -->@user <tag>',
+    query: 'query`|\n@team',
+    status: 'failed',
+    baseMedian: '1|2',
+    candidateMedian: '3\n4',
+    regression: '<!-- comment -->`@all',
+    threshold: 'x|y\r\n<!-- drop -->`@here <html>',
+  }]);
+
+  assert.equal(table.split('\n').length, 3);
+  assert.match(table, /safe \\\| injected \\\| @\u200buser &lt;tag&gt;/);
+  assert.match(table, /query&#96;\\\| @\u200bteam/);
+  assert.match(table, /1\\\|2/);
+  assert.match(table, /3 4/);
+  assert.match(table, /&#96;@\u200ball/);
+  assert.match(table, /x\\\|y &#96;@\u200bhere &lt;html&gt;/);
+  assert.doesNotMatch(table, /hidden|comment|drop|\r/);
+});
+
+test('writes the explicit no-report summary without an empty table', async () => {
+  const originalCwd = process.cwd();
+  const originalRunId = process.env.WORKFLOW_RUN_ID;
+  const originalRunAttempt = process.env.WORKFLOW_RUN_ATTEMPT;
+  const temporaryDir = fs.mkdtempSync(path.join(os.tmpdir(), 'query-regression-comment-'));
+  const artifactDir = path.join(temporaryDir, 'query-regression-comment');
+  const outputs = new Map();
+
+  try {
+    fs.mkdirSync(artifactDir);
+    fs.writeFileSync(path.join(artifactDir, 'query-regression-pr.json'), JSON.stringify({
+      run_id: 101,
+      run_attempt: 1,
+      base_repo: 'owner/repo',
+      pr_number: 42,
+      head_sha: 'head-sha',
+      head_repo: 'fork/repo',
+      built_base_sha: 'base-sha',
+      event_base_sha: 'event-base-sha',
+      candidate_sha: 'candidate-sha',
+    }));
+    process.chdir(temporaryDir);
+    process.env.WORKFLOW_RUN_ID = '101';
+    process.env.WORKFLOW_RUN_ATTEMPT = '1';
+
+    await handler({
+      core: {
+        info() {},
+        warning() {},
+        setOutput(name, value) { outputs.set(name, value); },
+      },
+      context: {
+        repo: { owner: 'owner', repo: 'repo' },
+        payload: {
+          workflow_run: {
+            event: 'pull_request',
+            head_sha: 'head-sha',
+            head_repository: { full_name: 'fork/repo' },
+            pull_requests: [{ number: 42 }],
+          },
+        },
+      },
+      github: {
+        rest: {
+          pulls: {
+            get: async () => ({
+              data: {
+                state: 'open',
+                base: { repo: { full_name: 'owner/repo' } },
+                head: { repo: { full_name: 'fork/repo' }, sha: 'head-sha' },
+              },
+            }),
+          },
+        },
+      },
+    });
+
+    const summary = fs.readFileSync(path.join(artifactDir, 'query-regression-summary.md'), 'utf8');
+    assert.equal(outputs.get('should_post'), 'true');
+    assert.match(summary, /No query-regression JSON reports were found in the artifact\./);
+    assert.doesNotMatch(summary, /\| Case \| Query \|/);
+  } finally {
+    process.chdir(originalCwd);
+    if (originalRunId === undefined) delete process.env.WORKFLOW_RUN_ID;
+    else process.env.WORKFLOW_RUN_ID = originalRunId;
+    if (originalRunAttempt === undefined) delete process.env.WORKFLOW_RUN_ATTEMPT;
+    else process.env.WORKFLOW_RUN_ATTEMPT = originalRunAttempt;
+    fs.rmSync(temporaryDir, { recursive: true, force: true });
+  }
+});
diff --git a/.github/workflows/develop.yml b/.github/workflows/develop.yml
index 0d9eceacb8..d9f6b0c061 100644
--- a/.github/workflows/develop.yml
+++ b/.github/workflows/develop.yml
@@ -51,6 +51,21 @@ jobs:
         with:
           config: licenserc-enterprise.toml
 
+  github-script-tests:
+    if: ${{ github.repository == 'GreptimeTeam/greptimedb' }}
+    name: GitHub Script Tests
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 24
+      - name: Run GitHub script tests
+        run: node --test .github/scripts/query-regression-comment.test.cjs
+
   check:
     if: ${{ github.repository == 'GreptimeTeam/greptimedb' }}
     name: Check