fix(ci): block agent PR title prefixes

Author: bokelley

.github/workflows/pr-title-check.yml

@@ -0,0 +1,21 @@
+name: PR Title Check
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  pr-title:
+    name: Check PR title
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check for agent/tool PR title prefix
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: node scripts/check-pr-title.cjs "$PR_TITLE"

AGENTS.md

@@ -1,5 +1,9 @@
 # ADCP Python SDK - Agent Reference
 
+## PR Title Hygiene
+
+Use concrete conventional-commits PR titles (`fix(scope): summary`, `docs: summary`, `feat(scope): summary`). Do not prefix titles with the tool or model that authored the PR, such as `[codex]`, `[claude]`, `[cursor]`, or similar ownership tags. Put authoring-tool context in the PR body or labels when it matters, not in the review-facing title.
+
 ## Server Handler Methods
 
 Override these in your `ADCPHandler` subclass. Unimplemented methods return `not_supported()`.

scripts/check-pr-title.cjs

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+
+const title = (process.argv.slice(2).join(' ') || process.env.PR_TITLE || '').trim();
+
+if (!title) {
+  console.error('PR title is empty.');
+  process.exit(1);
+}
+
+const disallowedAgentPrefix =
+  /^\[(codex|claude|claude-code|openai|chatgpt|copilot|cursor|aider|devin|agent|ai)\](?:\s|:|-|$)/i;
+
+if (disallowedAgentPrefix.test(title)) {
+  console.error(`Invalid PR title: ${title}`);
+  console.error('Remove the leading agent/tool prefix. Use a concrete conventional-commits title instead, for example:');
+  console.error('  fix(ci): block agent PR title prefixes');
+  process.exit(1);
+}