diff --git a/.github/workflows/contributor-card-bot.yml b/.github/workflows/contributor-card-bot.yml
index a582f9fc6..42acd2a75 100644
--- a/.github/workflows/contributor-card-bot.yml
+++ b/.github/workflows/contributor-card-bot.yml
@@ -6,10 +6,8 @@ name: Contributor Card Bot
 #
 # Intentionally NOT included: pull_request_review, pull_request_review_comment,
 # issue_comment. GitHub withholds repository secrets from these events when
-# they originate on forked PRs, which is precisely the path most external
-# contributor activity takes; the bot requires BOT_APP_* secrets to authenticate,
-# so wiring those events here would fail-closed exactly for the contributors we
-# want to recognize. They can be re-added later via a workflow_run handoff.
+# they originate on forked PRs, so the relay secret would fail-closed there too.
+# They can be re-added later via a workflow_run handoff.
 on:
   pull_request_target:
     types: [closed]
@@ -24,21 +22,16 @@ on:
 permissions:
   contents: read
 
-# Serialize all bot runs across the whole repository. The bot reads-then-writes
-# `data/contributor-card-state.json`; running events in parallel let multiple
-# runs read the same SHA and only the first PUT succeeds, the rest fail with a
-# 409 Conflict. They also let the same actor receive duplicate cards when a
-# burst of events fires before the first state write lands. A single repo-wide
-# group with `cancel-in-progress: false` queues runs and processes them in
-# arrival order, so every event still gets a card and the state file is never
-# stale on write.
+# Serialize all relay runs across the whole repository. The Cloudflare worker
+# owns durable state now, but queuing still keeps identical GitHub events from
+# racing each other and producing duplicate comments during bursty merge windows.
 concurrency:
   group: contributor-card-bot
   cancel-in-progress: false
 
 jobs:
   recognize:
-    name: Render and post contributor card
+    name: Relay contributor event to Cloudflare worker
     if: |
       github.repository == 'nexu-io/open-design' &&
       (
@@ -49,32 +42,46 @@ jobs:
         github.event_name == 'workflow_dispatch'
       )
     runs-on: ubuntu-latest
-    timeout-minutes: 8
+    timeout-minutes: 5
 
     steps:
-      - name: Checkout contributor bot
-        uses: actions/checkout@v6.0.2
-        with:
-          repository: nexu-io/open-design-bot-sandbox
-          ref: main
-
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 10
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v6.0.0
-        with:
-          node-version: 22
-          cache: pnpm
-
-      - name: Install bot dependencies
-        run: pnpm install --frozen-lockfile
-
-      - name: Run contributor bot
+      - name: Relay event payload
         env:
-          BOT_APP_ID: ${{ secrets.BOT_APP_ID }}
-          BOT_APP_INSTALLATION_ID: ${{ secrets.BOT_APP_INSTALLATION_ID }}
-          BOT_APP_PRIVATE_KEY: ${{ secrets.BOT_APP_PRIVATE_KEY }}
-        run: pnpm exec tsx scripts/action-handler.ts
+          CONTRIBUTOR_CARD_WORKER_URL: ${{ secrets.CONTRIBUTOR_CARD_WORKER_URL }}
+          CONTRIBUTOR_CARD_WORKER_SECRET: ${{ secrets.CONTRIBUTOR_CARD_WORKER_SECRET }}
+          GITHUB_EVENT_NAME: ${{ github.event_name }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+          GITHUB_EVENT_ACTION: ${{ github.event.action }}
+          GITHUB_RUN_ID: ${{ github.run_id }}
+          GITHUB_RUN_ATTEMPT: ${{ github.run_attempt }}
+          GITHUB_EVENT_PATH: ${{ github.event_path }}
+        run: |
+          python - <<'PY'
+          import json, os
+          from pathlib import Path
+
+          payload = json.loads(Path(os.environ["GITHUB_EVENT_PATH"]).read_text())
+          envelope = {
+            "repository": os.environ["GITHUB_REPOSITORY"],
+            "eventName": os.environ["GITHUB_EVENT_NAME"],
+            "action": os.environ.get("GITHUB_EVENT_ACTION") or payload.get("action"),
+            "deliveryId": f"{os.environ['GITHUB_RUN_ID']}-{os.environ['GITHUB_RUN_ATTEMPT']}",
+            "triggeredAt": __import__("datetime").datetime.utcnow().isoformat(timespec="milliseconds") + "Z",
+            "payload": payload,
+          }
+          Path("body.json").write_text(json.dumps(envelope, separators=(",", ":")))
+          PY
+          python - <<'PY'
+          import hashlib, hmac, os
+          from pathlib import Path
+
+          body = Path("body.json").read_bytes()
+          digest = hmac.new(os.environ["CONTRIBUTOR_CARD_WORKER_SECRET"].encode(), body, hashlib.sha256).hexdigest()
+          Path("signature.txt").write_text(f"sha256={digest}")
+          PY
+          curl --fail --silent --show-error \
+            -X POST \
+            -H "content-type: application/json" \
+            -H "x-open-design-signature: $(cat signature.txt)" \
+            --data-binary @body.json \
+            "$CONTRIBUTOR_CARD_WORKER_URL/api/github/events"