diff --git a/.github/scripts/post-endpoint-audit-report.cjs b/.github/scripts/post-endpoint-audit-report.cjs
index 4119cb9..bed7934 100644
--- a/.github/scripts/post-endpoint-audit-report.cjs
+++ b/.github/scripts/post-endpoint-audit-report.cjs
@@ -95,6 +95,20 @@ function renderEndpointAuditReport(report) {
   ].join('\n');
 }
 
+// A pull_request event raised from a fork runs with a read-only GITHUB_TOKEN,
+// so `pull-requests: write` in the workflow cannot be granted and the comment
+// POST comes back 403 "Resource not accessible by integration". The step is
+// `if: always()`, so that 403 failed the whole endpoint-audit check on every
+// fork PR regardless of what the audit found: #320 sat on it for 27 days and
+// #362 hit the identical wall. Push events have no PR to comment on at all
+// (context.issue.number is undefined), and the same guard covers them.
+function canCommentOnPullRequest(context) {
+  if (!context || context.eventName !== 'pull_request') return false;
+  const head = context.payload?.pull_request?.head;
+  if (!head?.repo?.full_name) return false;
+  return head.repo.full_name === `${context.repo.owner}/${context.repo.repo}`;
+}
+
 async function postEndpointAuditReport({ github, context, core, reportPath = REPORT_PATH }) {
   if (!fs.existsSync(reportPath)) {
     core.warning(`No audit report at ${reportPath}; skipping PR comment.`);
@@ -102,6 +116,21 @@ async function postEndpointAuditReport({ github, context, core, reportPath = REP
   }
 
   const body = renderEndpointAuditReport(JSON.parse(fs.readFileSync(reportPath, 'utf8')));
+
+  // The job summary is the one surface every run can write, so the report
+  // reaches a reviewer even when the comment is unavailable.
+  if (core?.summary) {
+    await core.summary.addRaw(body).write();
+  }
+
+  if (!canCommentOnPullRequest(context)) {
+    core.info(
+      'Skipping the PR comment: this run is a push or a fork pull_request, ' +
+        'whose token cannot write comments. The report is in the job summary.'
+    );
+    return;
+  }
+
   const { owner, repo } = context.repo;
   const issue_number = context.issue.number;
   const comments = await github.paginate(github.rest.issues.listComments, {
@@ -118,4 +147,4 @@ async function postEndpointAuditReport({ github, context, core, reportPath = REP
   }
 }
 
-module.exports = { postEndpointAuditReport, renderEndpointAuditReport };
+module.exports = { canCommentOnPullRequest, postEndpointAuditReport, renderEndpointAuditReport };
diff --git a/.github/workflows/endpoint-audit.yml b/.github/workflows/endpoint-audit.yml
index 19ad66d..90834ae 100644
--- a/.github/workflows/endpoint-audit.yml
+++ b/.github/workflows/endpoint-audit.yml
@@ -47,11 +47,19 @@ jobs:
           # .audit/ is a dot-directory; upload-artifact@v4 skips hidden paths by default.
           include-hidden-files: true
 
-      # Post the report as a single, self-updating comment on the PR. Runs even
-      # when the audit gate fails (the report is written before the gate), so
-      # reviewers see the mismatches that failed the check.
-      - name: Comment audit report on PR
-        if: always() && github.event_name == 'pull_request'
+      # Publish the report. It always lands in the job summary, and additionally
+      # as a single self-updating PR comment when the run's token can write one
+      # (same-repo pull requests). Runs even when the audit gate fails (the
+      # report is written before the gate), so reviewers see the mismatches that
+      # failed the check.
+      #
+      # A fork pull_request runs with a read-only token, so the comment POST
+      # returns 403 "Resource not accessible by integration". This step is
+      # `if: always()`, so an unguarded POST failed the whole check on every
+      # fork PR whatever the audit found. The guard lives in
+      # post-endpoint-audit-report.cjs; see canCommentOnPullRequest.
+      - name: Publish audit report
+        if: always()
         uses: actions/github-script@v7
         with:
           script: |
diff --git a/scripts/test-endpoint-audit.mjs b/scripts/test-endpoint-audit.mjs
index 05fb5df..b31324d 100644
--- a/scripts/test-endpoint-audit.mjs
+++ b/scripts/test-endpoint-audit.mjs
@@ -14,6 +14,50 @@ const { postEndpointAuditReport, renderEndpointAuditReport } = require(
 );
 const fixtureRoot = fs.mkdtempSync(path.join(os.tmpdir(), 'endpoint-audit-'));
 
+const summaryWrites = [];
+
+function fakeCore(overrides = {}) {
+  let buffer = '';
+  return {
+    warning: assert.fail,
+    info: () => {},
+    ...overrides,
+    summary: {
+      addRaw(text) {
+        buffer += text;
+        return this;
+      },
+      async write() {
+        summaryWrites.push(buffer);
+        buffer = '';
+        return this;
+      },
+    },
+  };
+}
+
+function sameRepoContext(number) {
+  return {
+    eventName: 'pull_request',
+    repo: { owner: 'OpenHands', repo: 'typescript-client' },
+    issue: { number },
+    payload: {
+      pull_request: { head: { repo: { full_name: 'OpenHands/typescript-client' } } },
+    },
+  };
+}
+
+function forkContext(number) {
+  return {
+    eventName: 'pull_request',
+    repo: { owner: 'OpenHands', repo: 'typescript-client' },
+    issue: { number },
+    payload: {
+      pull_request: { head: { repo: { full_name: 'georgeglarson/typescript-client' } } },
+    },
+  };
+}
+
 try {
   fs.mkdirSync(path.join(fixtureRoot, 'src/client'), { recursive: true });
 
@@ -112,8 +156,8 @@ try {
   let updatedComment;
   await postEndpointAuditReport({
     reportPath: path.join(fixtureRoot, '.audit/endpoint-audit.json'),
-    context: { repo: { owner: 'OpenHands', repo: 'typescript-client' }, issue: { number: 307 } },
-    core: { warning: assert.fail },
+    context: sameRepoContext(307),
+    core: fakeCore(),
     github: {
       paginate: async () => [{ id: 123, body: '<!-- endpoint-audit-report -->old' }],
       rest: {
@@ -132,6 +176,73 @@ try {
   assert.equal(updatedComment.comment_id, 123);
   assert.equal(updatedComment.body, body);
 
+  assert(summaryWrites.length === 1, 'a same-repo PR still writes the job summary');
+  assert(summaryWrites[0].includes('Endpoint audit'), 'the summary carries the report');
+
+  // A fork PR gets a read-only GITHUB_TOKEN, so the comment POST 403s and takes
+  // the whole job red. Every fork PR fails this check regardless of content:
+  // OpenHands/typescript-client#320 sat 27 days on it and #362 hit the same
+  // wall on 2026-08-28. The report still has to reach a reviewer, so it goes to
+  // the job summary and the comment is skipped rather than attempted.
+  summaryWrites.length = 0;
+  const forkInfo = [];
+  await postEndpointAuditReport({
+    reportPath: path.join(fixtureRoot, '.audit/endpoint-audit.json'),
+    context: forkContext(362),
+    core: fakeCore({ info: (msg) => forkInfo.push(msg) }),
+    github: {
+      paginate: async () => assert.fail('a fork PR must not read comments'),
+      rest: {
+        issues: {
+          listComments: () => assert.fail('a fork PR must not read comments'),
+          updateComment: async () => assert.fail('a fork PR must not post a comment'),
+          createComment: async () => assert.fail('a fork PR must not post a comment'),
+        },
+      },
+    },
+  });
+  assert.equal(summaryWrites.length, 1, 'a fork PR still writes the job summary');
+  assert(summaryWrites[0].includes('Endpoint audit'), 'the fork summary carries the report');
+  assert(
+    forkInfo.some((msg) => msg.includes('fork')),
+    'the skip is announced, not silent'
+  );
+
+  // A push event has no PR to comment on at all (context.issue.number is
+  // undefined there), so the same guard covers it.
+  summaryWrites.length = 0;
+  await postEndpointAuditReport({
+    reportPath: path.join(fixtureRoot, '.audit/endpoint-audit.json'),
+    context: { eventName: 'push', repo: { owner: 'OpenHands', repo: 'typescript-client' } },
+    core: fakeCore(),
+    github: {
+      paginate: async () => assert.fail('a push event must not read comments'),
+      rest: {
+        issues: {
+          listComments: () => assert.fail('a push event must not read comments'),
+          updateComment: async () => assert.fail('a push event must not post a comment'),
+          createComment: async () => assert.fail('a push event must not post a comment'),
+        },
+      },
+    },
+  });
+  assert.equal(summaryWrites.length, 1, 'a push run still writes the job summary');
+
+  // A missing report is still a warning with nothing published.
+  summaryWrites.length = 0;
+  const warnings = [];
+  await postEndpointAuditReport({
+    reportPath: path.join(fixtureRoot, '.audit/does-not-exist.json'),
+    context: sameRepoContext(307),
+    core: fakeCore({ warning: (msg) => warnings.push(msg) }),
+    github: {
+      paginate: async () => assert.fail('a missing report must not read comments'),
+      rest: { issues: { listComments: () => assert.fail('no report, no comment') } },
+    },
+  });
+  assert.equal(summaryWrites.length, 0, 'no report means no summary');
+  assert.equal(warnings.length, 1, 'a missing report warns');
+
   console.log('endpoint-audit tooling test passed');
 } finally {
   fs.rmSync(fixtureRoot, { recursive: true, force: true });