Vercel Monitor

Overview

Set up a short-lived Codex heartbeat that watches a Vercel deployment and reports back in the current thread when it is ready or failed. Always include both the Vercel deployment/dashboard URL and the public preview URL in the final notification.

Workflow

1. Resolve the deployment to monitor.
2. Check whether it is already ready.
3. Create a heartbeat monitor if it is still building or queued.
4. Tell the user what is being monitored and which links will be reported.

Resolve Links

Prefer sources in this order:

1. A Vercel deployment URL or preview URL explicitly provided by the user.
2. URLs in the current terminal output or pasted logs.
3. Vercel URLs from the active GitHub PR checks or deployment status.
4. Vercel CLI output, if the repository is linked and the user asked for the latest deployment.

Use scripts/extract-vercel-links.py to normalize raw terminal, Vercel CLI, or GitHub output:

python3 .agents/skills/vercel/scripts/extract-vercel-links.py < deployment-output.txt

If only one link is available, use vercel inspect <url> when authenticated to discover the missing deployment or preview URL. If neither a deployment URL nor a preview URL can be found, ask the user for one concise piece of context: the Vercel URL, PR URL/number, or branch name.

Check Status

Prefer Vercel's deployment status over HTTP probing:

vercel inspect <deployment-or-preview-url>

Treat these as terminal states:

• READY: report success immediately; do not create a monitor.
• ERROR, FAILED, CANCELED, or CANCELLED: report failure immediately; do not create a monitor.

Treat these as monitorable states:

• BUILDING, QUEUED, INITIALIZING, or unknown but plausibly in progress.

If Vercel CLI is unavailable or unauthenticated, probe the preview URL with curl -I -L --max-time 20 <preview-url>. HTTP 2xx or 3xx means the preview is ready. HTTP 401 or 403 can also mean the deployment is ready but protected; report it as ready/protected if the response is clearly from Vercel deployment protection. A Vercel DEPLOYMENT_NOT_FOUND, 404, timeout, or DNS failure means keep monitoring unless a terminal Vercel status says otherwise.

Create The Monitor

Use the Codex app automation tool. If automation_update is not already in the tool list, search for it with tool_search before creating the monitor.

Create a heartbeat, not a cron, because the user wants this thread to be notified later. Use a one-minute cadence with a bounded count, usually 30 attempts unless the user asked for a different window. Do not show the raw RRULE string to the user.

The heartbeat prompt must be self-contained. Include:

• Deployment/dashboard URL, if known.
• Preview URL, if known.
• Branch, PR, project, or commit context, if known.
• Status command to prefer, normally vercel inspect <url>.
• HTTP fallback command for the preview URL.
• Ready criteria and failure criteria.
• Instruction to reply in the current thread only when ready or failed.
• Instruction to include both links in the notification.
• Instruction to delete or pause this heartbeat after reporting a terminal state, if the automation id is available.

Example heartbeat prompt:

Check this Vercel deployment until it reaches a terminal state.

Deployment URL: <deployment-url-or-unknown>
Preview URL: <preview-url-or-unknown>
Context: <branch/pr/project/commit-or-unknown>

Prefer `vercel inspect <deployment-or-preview-url>` if available and authenticated. If that is unavailable, use `curl -I -L --max-time 20 <preview-url>` and, if needed, fetch the response body to distinguish Vercel deployment protection from DEPLOYMENT_NOT_FOUND.

Ready means Vercel status READY, or the preview URL returns HTTP 2xx/3xx, or it returns Vercel deployment-protection HTTP 401/403. Failure means Vercel status ERROR, FAILED, CANCELED, or CANCELLED.

If ready, reply in the thread: "Vercel deployment is ready" and include:
- Deployment: <deployment-url>
- Preview: <preview-url>

If failed, reply in the thread with the failure status and include the same two links.

If still building, queued, initializing, not found, or unknown, stay quiet and let the next heartbeat check again. After reporting ready or failed, delete or pause this heartbeat if the automation id is available.

After creating the heartbeat, tell the user briefly which deployment/preview is being watched and the check cadence. If the deployment is already ready or failed, do not create a monitor; report the terminal status and links immediately.