diff --git a/.github/actions/code-review/action.yml b/.github/actions/code-review/action.yml
new file mode 100644
index 0000000..a258a9b
--- /dev/null
+++ b/.github/actions/code-review/action.yml
@@ -0,0 +1,103 @@
+name: 'protoLabs Code Review'
+description: 'Async-parallel code review via the protoLabs LLM gateway. Maps the repo into bounded feature records, runs a model-backed review, posts findings as a sticky PR comment, and appends them to the GitHub Actions step summary. Non-blocking by design.'
+author: 'protoLabs'
+branding:
+  icon: 'eye'
+  color: 'blue'
+
+inputs:
+  gateway-api-key:
+    description: 'Bearer token for the LLM gateway (passed as OPENAI_API_KEY to review-code).'
+    required: true
+  gateway-base-url:
+    description: 'LLM gateway base URL without `/v1`. `/v1` is appended automatically.'
+    required: false
+    default: 'https://api.proto-labs.ai'
+  model:
+    description: 'Gateway model alias. Defaults to review-code default (protolabs/smart).'
+    required: false
+    default: ''
+  timeout-ms:
+    description: 'Per-request timeout for the LLM gateway in milliseconds.'
+    required: false
+    default: '300000'
+  github-token:
+    description: 'Token used to post the sticky PR comment. Defaults to the workflow GITHUB_TOKEN.'
+    required: false
+    default: ${{ github.token }}
+  pr-number:
+    description: 'Pull request number to comment on. Defaults to github.event.pull_request.number.'
+    required: false
+    default: ${{ github.event.pull_request.number }}
+  release-tools-ref:
+    description: 'release-tools ref (branch/tag/commit) to install. Defaults to main.'
+    required: false
+    default: 'main'
+
+outputs:
+  findings:
+    description: 'Number of review findings produced. Empty string if the review step failed.'
+    value: ${{ steps.review.outputs.findings }}
+  report-path:
+    description: 'Filesystem path of the generated markdown report. Empty string if no report was generated.'
+    value: ${{ steps.report.outputs.report_path }}
+
+runs:
+  using: composite
+  steps:
+    - name: Initialize review state
+      shell: bash
+      run: |
+        npx --yes -p "github:protoLabsAI/release-tools#${{ inputs.release-tools-ref }}" review-code init
+
+    - name: Map features
+      shell: bash
+      run: |
+        npx --yes -p "github:protoLabsAI/release-tools#${{ inputs.release-tools-ref }}" review-code map
+
+    - name: Run review against PR diff
+      id: review
+      shell: bash
+      continue-on-error: true
+      env:
+        OPENAI_API_KEY: ${{ inputs.gateway-api-key }}
+        OPENAI_BASE_URL: ${{ inputs.gateway-base-url }}/v1
+        CODE_REVIEW_TIMEOUT_MS: ${{ inputs.timeout-ms }}
+        CODE_REVIEW_MODEL: ${{ inputs.model }}
+      run: |
+        set -o pipefail
+        ARGS="--all"
+        if [ -n "${{ inputs.model }}" ]; then ARGS="$ARGS --model ${{ inputs.model }}"; fi
+        npx --yes -p "github:protoLabsAI/release-tools#${{ inputs.release-tools-ref }}" review-code run $ARGS 2>&1 | tee /tmp/review-run.log
+        findings=$(grep -oE 'findings=[0-9]+' /tmp/review-run.log | tail -1 | cut -d= -f2)
+        echo "findings=${findings:-0}" >> "$GITHUB_OUTPUT"
+
+    - name: Build markdown report
+      id: report
+      if: always()
+      shell: bash
+      run: |
+        npx --yes -p "github:protoLabsAI/release-tools#${{ inputs.release-tools-ref }}" review-code report --output /tmp/code-review.md 2>&1 | tee /tmp/report.log || true
+        if [ -f /tmp/code-review.md ]; then
+          echo "report_path=/tmp/code-review.md" >> "$GITHUB_OUTPUT"
+        fi
+
+    - name: Post findings as sticky PR comment
+      if: always() && steps.report.outputs.report_path != '' && inputs.pr-number != ''
+      shell: bash
+      env:
+        GH_TOKEN: ${{ inputs.github-token }}
+        PR_NUMBER: ${{ inputs.pr-number }}
+        REPORT_PATH: ${{ steps.report.outputs.report_path }}
+        FINDINGS_COUNT: ${{ steps.review.outputs.findings }}
+      run: node "${{ github.action_path }}/post-findings.mjs"
+
+    - name: Append findings to step summary
+      if: always() && steps.report.outputs.report_path != ''
+      shell: bash
+      run: |
+        {
+          echo "## Code Review — ${{ steps.review.outputs.findings }} finding(s)"
+          echo
+          cat "${{ steps.report.outputs.report_path }}"
+        } >> "$GITHUB_STEP_SUMMARY"
diff --git a/.github/actions/code-review/post-findings.mjs b/.github/actions/code-review/post-findings.mjs
new file mode 100644
index 0000000..cafe537
--- /dev/null
+++ b/.github/actions/code-review/post-findings.mjs
@@ -0,0 +1,88 @@
+#!/usr/bin/env node
+/**
+ * Post a code-review findings report as a sticky PR comment.
+ *
+ * Reads REPORT_PATH, PR_NUMBER, FINDINGS_COUNT, and GH_TOKEN from the
+ * environment. Uses the `gh` CLI to PATCH a previously-posted comment
+ * tagged with the `code-review:findings` marker, so re-runs replace
+ * prior output instead of stacking new comments on the PR.
+ *
+ * Called from the composite action at
+ * `.github/actions/code-review/action.yml`. Designed to be non-blocking:
+ * any failure is logged and exit code is 0.
+ */
+import { readFileSync, writeFileSync, mkdtempSync } from 'node:fs';
+import { execFileSync } from 'node:child_process';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+
+const MARKER = '<!-- code-review:findings -->';
+
+const reportPath = process.env.REPORT_PATH;
+const prNumber = process.env.PR_NUMBER;
+const findingsCount = process.env.FINDINGS_COUNT || '?';
+
+if (!reportPath || !prNumber) {
+  console.error('REPORT_PATH and PR_NUMBER must be set');
+  process.exit(0); // non-blocking
+}
+
+let report;
+try {
+  report = readFileSync(reportPath, 'utf8');
+} catch (err) {
+  console.error(`Cannot read report at ${reportPath}: ${err.message}`);
+  process.exit(0);
+}
+
+const body = `${MARKER}
+## Code Review — ${findingsCount} finding(s)
+
+> Async review running parallel to CodeRabbit. Findings are advisory; not all are merge blockers.
+
+${report}
+`;
+
+function gh(args, opts = {}) {
+  return execFileSync('gh', args, { encoding: 'utf8', ...opts });
+}
+
+const workdir = mkdtempSync(join(tmpdir(), 'code-review-'));
+const bodyFile = join(workdir, 'body.md');
+writeFileSync(bodyFile, body);
+
+let existingId = null;
+try {
+  const comments = JSON.parse(gh(['pr', 'view', prNumber, '--json', 'comments']));
+  const match = (comments.comments ?? []).find((c) => c.body?.includes(MARKER));
+  if (match) existingId = match.id;
+} catch (err) {
+  console.error(`Failed to list comments (continuing as new): ${err.message}`);
+}
+
+if (existingId) {
+  try {
+    const payloadFile = join(workdir, 'patch.json');
+    writeFileSync(payloadFile, JSON.stringify({ body }));
+    gh([
+      'api',
+      '--method',
+      'PATCH',
+      `/repos/{owner}/{repo}/issues/comments/${existingId}`,
+      '--input',
+      payloadFile,
+    ]);
+    console.log(`Updated existing code-review comment ${existingId}`);
+    process.exit(0);
+  } catch (err) {
+    console.error(`Patch failed, posting new comment instead: ${err.message}`);
+  }
+}
+
+try {
+  gh(['pr', 'comment', prNumber, '--body-file', bodyFile]);
+  console.log('Posted new code-review comment');
+} catch (err) {
+  console.error(`Failed to post comment: ${err.message}`);
+  process.exit(0);
+}
diff --git a/README.md b/README.md
index 778955b..cd7f246 100644
--- a/README.md
+++ b/README.md
@@ -236,6 +236,60 @@ The harness keeps prompts bounded, skips external symlinks, rejects findings
 outside the reviewed file allowlist, and preserves existing triage fields when
 a finding is regenerated.
 
+### Use it as a GitHub Action
+
+For PR-level async-parallel review (runs alongside CodeRabbit, posts findings
+as a sticky PR comment), use the bundled composite action:
+
+```yaml
+# .github/workflows/code-review.yml in your repo
+name: Code Review
+
+on:
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with: { fetch-depth: 0 }
+      - uses: actions/setup-node@v4
+        with: { node-version: "22" }
+      - uses: protoLabsAI/release-tools/.github/actions/code-review@main
+        with:
+          gateway-api-key: ${{ secrets.GATEWAY_API_KEY }}
+          gateway-base-url: ${{ secrets.GATEWAY_BASE_URL }}
+```
+
+#### Action inputs
+
+| Input               | Required | Default                                   | Description                                                |
+| ------------------- | -------- | ----------------------------------------- | ---------------------------------------------------------- |
+| `gateway-api-key`   | yes      | —                                         | Bearer token for the gateway. Passed as `OPENAI_API_KEY`.  |
+| `gateway-base-url`  | no       | `https://api.proto-labs.ai`               | Gateway base URL without `/v1` — appended automatically.   |
+| `model`             | no       | `protolabs/smart` (review-code default)   | Override the gateway model alias.                          |
+| `timeout-ms`        | no       | `300000`                                  | Per-request timeout for the LLM gateway in milliseconds.   |
+| `pr-number`         | no       | `${{ github.event.pull_request.number }}` | PR number to comment on; skip the sticky comment if empty. |
+| `github-token`      | no       | `${{ github.token }}`                     | Token for posting the sticky PR comment.                   |
+| `release-tools-ref` | no       | `main`                                    | release-tools ref to install (branch, tag, or commit).     |
+
+#### Behavior
+
+- Non-blocking — review failures or timeouts do not gate the PR (`continue-on-error: true` on the review step).
+- Posts a **single sticky PR comment** tagged with the `code-review:findings` marker; re-runs `PATCH` the existing comment rather than stacking new ones.
+- Appends the markdown report to `$GITHUB_STEP_SUMMARY` so findings are visible in the Actions UI even when no PR comment is posted (e.g., manual `workflow_dispatch`).
+
+#### Required secrets
+
+- `GATEWAY_API_KEY` — same secret used by the release-notes action.
+- `GATEWAY_BASE_URL` — only required if your gateway isn't at the default `https://api.proto-labs.ai`.
+
 ## Development
 
 ```bash