diff --git a/.DS_Store b/.DS_Store
index b7f6d30..cdf4d7a 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/.github/workflows/prnote.yml b/.github/workflows/prnote.yml
new file mode 100644
index 0000000..6cc76d3
--- /dev/null
+++ b/.github/workflows/prnote.yml
@@ -0,0 +1,18 @@
+name: PRNote
+
+on:
+  pull_request:
+    types: [opened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  generate-pr-note:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate PR title and description
+        uses: richardj46/prnote-action@v0.1.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/README.md b/README.md
index fca1777..54cbfb7 100644
--- a/README.md
+++ b/README.md
@@ -21,11 +21,10 @@ Requires Node.js 20 or newer.
 ```sh
 cp .env.example .env
 npm install
-set -a; source .env; set +a
 npm run dev
 ```
 
-GitHub must be able to reach the webhook URL, so expose port 3000 with a trusted tunnel for local development. The app intentionally does not load `.env` itself; production secrets should come from the hosting platform.
+GitHub must be able to reach the webhook URL, so expose port 3000 with a trusted tunnel for local development. The app automatically loads `.env` from its working directory. Variables already provided by the hosting platform take precedence.
 
 ## Configuration
 
diff --git a/package.json b/package.json
index 34554dc..9a5f4e9 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "format:check": "prettier --check ."
   },
   "engines": {
-    "node": ">=20"
+    "node": ">=20.12"
   },
   "dependencies": {
     "minimatch": "^10.0.1"
diff --git a/src/server.ts b/src/server.ts
index 63e8994..9f0d798 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -1,9 +1,17 @@
 import { createServer } from "node:http";
+import { loadEnvFile } from "node:process";
 import { verifyWebhook } from "./auth.js";
 import { readConfig } from "./config.js";
 import { processPullRequest } from "./processor.js";
 import type { PullRequestOpenedPayload } from "./types.js";
 
+try {
+  loadEnvFile();
+} catch (error) {
+  const code = (error as NodeJS.ErrnoException).code;
+  if (code !== "ENOENT") throw error;
+}
+
 const config = readConfig();
 const maxBodyBytes = 25 * 1024 * 1024;