diff --git a/src/core/cli.ts b/src/core/cli.ts
index ea1070e..afa4601 100644
--- a/src/core/cli.ts
+++ b/src/core/cli.ts
@@ -263,7 +263,13 @@ function render(value: VerbResult, packageDir: string): string[] {
       return lines;
     }
     case 'attach':
-      if (value.via === 'gh') return [`${value.alreadyPosted ? 'already posted' : 'posted'}  ${value.posted.map((p) => basename(p)).join(', ')}  in the description of ${value.prUrl}`];
+      if (value.via === 'gh') {
+        const { comment } = value;
+        return [
+          `${value.alreadyPosted ? 'already posted' : 'posted'}  ${value.posted.map((p) => basename(p)).join(', ')}  in the description of ${value.prUrl}`,
+          ...(comment === undefined ? [] : [comment.failure === null ? `commented  ${comment.body}` : `not commented  gh pr comment failed: ${comment.failure}. Post this comment on the PR yourself: ${comment.body}`]),
+        ];
+      }
       return [
         `handed off  ${value.handedOff.map((p) => basename(p)).join(', ')}  to the session's runner (${value.sessionRunUrl}), because ${value.because}`,
         `next        {cli} down ends the session; the verify-attach workflow then puts the evidence in the description of PR #${value.pr}`,
diff --git a/src/core/publish.ts b/src/core/publish.ts
index 8d13ebd..d8d4f1c 100644
--- a/src/core/publish.ts
+++ b/src/core/publish.ts
@@ -4,7 +4,7 @@ import { tmpdir } from 'node:os';
 import { basename, extname, join } from 'node:path';
 import { run as defaultRunner, type Runner } from './exec.ts';
 import type { Publishable, Showable } from './evidence.ts';
-import { VerifyFailure, everyFile, type AttachResult, type EvidenceBundle, type EvidencePath, type EvidenceSummary, type HostAdapter, type MediaChoice, type Platform } from './types.ts';
+import { VerifyFailure, everyFile, type AttachResult, type EvidenceBundle, type EvidenceComment, type EvidencePath, type EvidenceSummary, type HostAdapter, type MediaChoice, type Platform } from './types.ts';
 
 export function summarize(evidence: Showable): EvidenceSummary {
   return {
@@ -192,14 +192,21 @@ function uploadedIn(body: string, platform: Platform, run: string): readonly str
   return block === null || !block.includes(`\`${run}\``) ? [] : (block.match(UPLOADED) ?? []);
 }
 
-async function readDescription(runner: Runner, repo: string, pr: number): Promise<{ readonly body: string; readonly url: string }> {
-  const viewed = await runner('gh', ['pr', 'view', String(pr), '--repo', repo, '--json', 'body,url,state']);
+async function readDescription(runner: Runner, repo: string, pr: number): Promise<{ readonly body: string; readonly url: string; readonly isDraft: boolean }> {
+  const viewed = await runner('gh', ['pr', 'view', String(pr), '--repo', repo, '--json', 'body,url,state,isDraft']);
   if (viewed.code !== 0) throw new CannotPostHere('gh pr view failed', `gh pr view failed: ${viewed.stderr.trim()}`, 'check `gh auth status` and that the PR exists');
-  const parsed = JSON.parse(viewed.stdout) as { readonly body?: string | null; readonly url?: string; readonly state?: string };
+  const parsed = JSON.parse(viewed.stdout) as { readonly body?: string | null; readonly url?: string; readonly state?: string; readonly isDraft?: boolean };
   if (parsed.state !== 'OPEN') {
     throw new VerifyFailure('USAGE', `PR #${pr} of ${repo} is ${parsed.state?.toLowerCase() ?? 'not known to be open'}, and attach writes only to an open pull request`, `pass the number of an open pull request as --pr, or reopen PR #${pr}, then rerun {cli} attach`);
   }
-  return { body: parsed.body ?? '', url: parsed.url ?? '' };
+  return { body: parsed.body ?? '', url: parsed.url ?? '', isDraft: parsed.isDraft === true };
+}
+
+// The evidence is already in the description by now, so a comment that can't be posted is reported, and doesn't fail the attach.
+async function commentAfterEvidence(host: HostAdapter, pr: number, runner: Runner): Promise<EvidenceComment> {
+  const body = host.commentAfterEvidence!;
+  const sent = await runner('gh', ['pr', 'comment', String(pr), '--repo', host.githubRepo, '--body', body]);
+  return { body, failure: sent.code === 0 ? null : sent.stderr.trim() };
 }
 
 export async function postToPullRequest(bundle: EvidenceBundle, host: HostAdapter, runner: Runner = defaultRunner): Promise<AttachResult> {
@@ -252,7 +259,7 @@ export async function postToPullRequest(bundle: EvidenceBundle, host: HostAdapte
 
     const notLaidOut = (why: string): VerifyFailure =>
       new VerifyFailure('NOT_READY', `the files of run ${run} are in the description of PR #${pr} as a list, one under the other, and were not laid out: ${why}`, 'rerun {cli} attach once nobody is editing the description');
-    const listedNow = (await readDescription(runner, host.githubRepo, pr)).body;
+    const { body: listedNow, isDraft } = await readDescription(runner, host.githubRepo, pr);
     const uploaded = uploadedIn(listedNow, platform, run);
     if (uploaded.length !== files.length) throw notLaidOut(`the block there now does not show run ${run} with the ${files.length} addresses GitHub gave its files`);
     const laidOut = withEvidenceBlock(listedNow, platform, laidOutWith(uploaded));
@@ -260,7 +267,9 @@ export async function postToPullRequest(bundle: EvidenceBundle, host: HostAdapte
     const arranged = await edit(laidOut.body, []);
     if (arranged.code !== 0) throw notLaidOut(`gh pr edit failed: ${arranged.stderr.trim()}`);
 
-    return { verb: 'attach', via: 'gh', prUrl, posted: paths, alreadyPosted: false };
+    // A draft gets no review yet, and CodeRabbit reads the description when the pull request turns ready.
+    const comment = host.commentAfterEvidence === undefined || isDraft ? null : await commentAfterEvidence(host, pr, runner);
+    return { verb: 'attach', via: 'gh', prUrl, posted: paths, alreadyPosted: false, ...(comment === null ? {} : { comment }) };
   } finally {
     rmSync(scratch, { recursive: true, force: true });
   }
diff --git a/src/core/types.ts b/src/core/types.ts
index 5c8f2e9..4c88209 100644
--- a/src/core/types.ts
+++ b/src/core/types.ts
@@ -207,8 +207,13 @@ export interface HandOffReceipt {
   readonly sessionRunUrl: string;
 }
 
+export interface EvidenceComment {
+  readonly body: string;
+  readonly failure: string | null;
+}
+
 export type AttachResult =
-  | { readonly verb: 'attach'; readonly via: 'gh'; readonly prUrl: string; readonly posted: readonly EvidencePath[]; readonly alreadyPosted: boolean }
+  | { readonly verb: 'attach'; readonly via: 'gh'; readonly prUrl: string; readonly posted: readonly EvidencePath[]; readonly alreadyPosted: boolean; readonly comment?: EvidenceComment }
   | ({ readonly verb: 'attach'; readonly via: 'runner'; readonly pr: number; readonly handedOff: readonly EvidencePath[]; readonly because: string } & HandOffReceipt);
 
 export type DownResult =
@@ -470,6 +475,8 @@ export interface HostAdapter {
   readonly cli: string;
   readonly platforms: readonly Platform[];
   readonly githubRepo: string;
+  /** `attach` posts this on a ready pull request after it changes the description, because a review bot does not reread an edited description by itself. */
+  readonly commentAfterEvidence?: string;
   appId(platform: Platform): string;
   buildInputs(platform: Platform, backend: BackendKind): readonly string[];
   build(platform: Platform, key: BuildKey, into: ScratchPath, progress: (line: string) => void): Promise<BuiltApp>;
diff --git a/test/evidence.test.ts b/test/evidence.test.ts
index e7282f6..64f2756 100644
--- a/test/evidence.test.ts
+++ b/test/evidence.test.ts
@@ -13,7 +13,8 @@ import { Secret } from '../specs/support/secret.ts';
 import { attach } from '../src/core/verbs.ts';
 import { newRunId } from '../specs/support/inputs.ts';
 import { openWorkspace } from '../src/core/workspace.ts';
-import type { BuildKey, EvidencePath, EvidenceRecord, EvidenceSummary, HostAdapter, RunId } from '../src/core/types.ts';
+import { createOutput } from '../src/core/cli.ts';
+import type { BuildKey, EvidencePath, EvidenceRecord, EvidenceSummary, HostAdapter, RunId, VerbResult } from '../src/core/types.ts';
 
 const OWN_USER = 'user_own';
 
@@ -325,9 +326,10 @@ describe('attach', () => {
     readonly attached: readonly string[];
   }
 
-  function fakeGh(options: { readonly ffmpeg?: Runner; readonly attachFlag?: boolean; readonly body?: string; readonly onView?: (views: number, pr: { body: string; state: string }) => void; readonly upload?: (reference: string, address: string) => string } = {}) {
+  function fakeGh(options: { readonly ffmpeg?: Runner; readonly attachFlag?: boolean; readonly body?: string; readonly onView?: (views: number, pr: { body: string; state: string }) => void; readonly upload?: (reference: string, address: string) => string; readonly isDraft?: boolean; readonly commentFails?: boolean } = {}) {
     const pr = { body: options.body ?? DESCRIPTION, state: 'OPEN' };
     const edits: Edit[] = [];
+    const comments: (readonly string[])[] = [];
     let views = 0;
     let uploads = 0;
     const runner: Runner = async (command, args, runOptions) => {
@@ -337,7 +339,11 @@ describe('attach', () => {
       if (args[1] === 'view') {
         views += 1;
         options.onView?.(views, pr);
-        return { code: 0, stdout: JSON.stringify({ body: pr.body, url: PR_URL, state: pr.state }), stderr: '' };
+        return { code: 0, stdout: JSON.stringify({ body: pr.body, url: PR_URL, state: pr.state, isDraft: options.isDraft === true }), stderr: '' };
+      }
+      if (args[1] === 'comment') {
+        comments.push(args);
+        return options.commentFails === true ? { code: 1, stdout: '', stderr: 'HTTP 403: nope\n' } : { code: 0, stdout: `${PR_URL}#issuecomment-1\n`, stderr: '' };
       }
       const bodyFile = readFileSync(args[args.indexOf('--body-file') + 1]!, 'utf8');
       const attached = args.filter((_, i) => args[i - 1] === '--attach').map((file) => readFileSync(join(runOptions!.cwd!, file), 'utf8'));
@@ -348,13 +354,13 @@ describe('attach', () => {
       });
       return { code: 0, stdout: `${PR_URL}\n`, stderr: '' };
     };
-    return { runner, pr, edits };
+    return { runner, pr, edits, comments };
   }
 
-  function checkout(gh: { readonly runner: Runner } = fakeGh()) {
+  function checkout(gh: { readonly runner: Runner } = fakeGh(), hostOptions: Partial<HostAdapter> = {}) {
     const packageDir = mkdtempSync(join(tmpdir(), 'verify-attach-'));
     const workspace = openWorkspace({ packageDir, worktree: packageDir, home: join(packageDir, 'home') });
-    const deps = { host, workspace, runner: gh.runner, env: {}, progress: () => undefined, instances: heldInstances() };
+    const deps = { host: { ...host, ...hostOptions }, workspace, runner: gh.runner, env: {}, progress: () => undefined, instances: heldInstances() };
     const sealed = (shape: { readonly called: string; readonly shots?: readonly string[]; readonly states?: readonly string[]; readonly spec?: string; readonly specs?: readonly string[]; readonly video?: boolean; readonly failed?: boolean; readonly failureShot?: boolean; readonly recordsTests?: boolean; readonly change?: Partial<EvidenceRecord>; readonly log?: string }) => {
       const { run, dir } = workspace.newRun();
       mkdirSync(join(dir, 'screenshots'), { recursive: true });
@@ -651,6 +657,60 @@ describe('attach', () => {
     assert.deepEqual(result, { verb: 'attach', via: 'gh', prUrl: PR_URL, posted: [join(dir, 'screenshots', 'profile.png')], alreadyPosted: false });
   });
 
+  describe('the comment after the evidence', () => {
+    const RECHECK = '@coderabbitai run pre-merge checks';
+    const printed = (result: VerbResult): readonly string[] => {
+      let out = '';
+      createOutput(false, '/tmp', 'bin/control-x', { write: (text: string) => (out += text) }, { write: () => true }).result(result);
+      return out.trimEnd().split('\n');
+    };
+
+    it('posts the host\'s comment on a ready pull request once the tables are written', async () => {
+      const gh = fakeGh();
+      const { deps, sealed } = checkout(gh, { commentAfterEvidence: RECHECK });
+      const result = await attach(deps, { verb: 'attach', run: sealed({ called: 'after' }).run, pr: 9, media: still, before: null });
+      assert.equal(gh.edits.length, 2);
+      assert.deepEqual(gh.comments, [['pr', 'comment', '9', '--repo', 'clerk/clerk-ios', '--body', RECHECK]]);
+      assert.deepEqual(result.verb === 'attach' && result.via === 'gh' ? result.comment : null, { body: RECHECK, failure: null });
+    });
+
+    it('posts nothing on a draft, for a host without a comment, or when the description already holds the evidence', async () => {
+      const draft = fakeGh({ isDraft: true });
+      const onDraft = checkout(draft, { commentAfterEvidence: RECHECK });
+      const draftResult = await attach(onDraft.deps, { verb: 'attach', run: onDraft.sealed({ called: 'after' }).run, pr: 9, media: still, before: null });
+      assert.deepEqual(draft.comments, []);
+      assert.equal('comment' in draftResult, false);
+
+      const silent = fakeGh();
+      const noComment = checkout(silent);
+      await attach(noComment.deps, { verb: 'attach', run: noComment.sealed({ called: 'after' }).run, pr: 9, media: still, before: null });
+      assert.deepEqual(silent.comments, []);
+
+      const repeated = fakeGh();
+      const again = checkout(repeated, { commentAfterEvidence: RECHECK });
+      const { run } = again.sealed({ called: 'after' });
+      await attach(again.deps, { verb: 'attach', run, pr: 9, media: still, before: null });
+      const second = await attach(again.deps, { verb: 'attach', run, pr: 9, media: still, before: null });
+      assert.equal(repeated.comments.length, 1);
+      assert.equal('comment' in second, false);
+    });
+
+    it('keeps the attach and reports the failure when the comment cannot be posted', async () => {
+      const gh = fakeGh({ commentFails: true });
+      const { deps, sealed } = checkout(gh, { commentAfterEvidence: RECHECK });
+      const result = await attach(deps, { verb: 'attach', run: sealed({ called: 'after' }).run, pr: 9, media: still, before: null });
+      assert.equal(gh.edits.length, 2);
+      assert.deepEqual(result.verb === 'attach' && result.via === 'gh' ? result.comment : null, { body: RECHECK, failure: 'HTTP 403: nope' });
+      assert.deepEqual(printed(result).slice(1), [`not commented  gh pr comment failed: HTTP 403: nope. Post this comment on the PR yourself: ${RECHECK}`]);
+    });
+
+    it('says what it commented', async () => {
+      const { deps, sealed } = checkout(fakeGh(), { commentAfterEvidence: RECHECK });
+      const result = await attach(deps, { verb: 'attach', run: sealed({ called: 'after' }).run, pr: 9, media: still, before: null });
+      assert.deepEqual(printed(result).slice(1), [`commented  ${RECHECK}`]);
+    });
+  });
+
   it('leaves the list in the description and says so when the addresses of the files cannot be read back, or the block names another run by then', async () => {
     const gh = fakeGh({ upload: (reference) => reference });
     const { deps, sealed } = checkout(gh);