DEVOPS

Mirror Vercel synthetic gate into a blocking GitHub PR check

Listens for new Vercel preview deployments on a pull request, runs the synthetic budget checks.

CategoryDevOps
Enginesim
Difficultyintermediate
Triggerwebhook
Steps5
Setup~15 min

How it runs

The automated pipeline, trigger to output.

  • TriggerVercel preview deployment.succeeded webhookVercelVercel
  • ActionRead commit SHA and PR number from deploymentVercelVercel
  • ActionPost pending GitHub commit statusGitHubGitHub
  • LogicRun synthetic suite and compare to baseline budgets
  • OutputWrite success/failure commit status to GitHubGitHubGitHub

What it does

For every preview Vercel builds on a pull request, this workflow runs the synthetic check suite against the preview URL and reports the result back as a GitHub commit status (`synthetic/budgets`). Marked required in branch protection, a failing status blocks both the merge and any downstream promote, turning your performance budget into a hard PR gate.

When to use it

Use it when your team gates releases at the PR level and wants the synthetic verdict to live next to CI checks, visible inline on the PR, rather than in a separate dashboard.

How it works

  1. 1A Vercel `deployment.succeeded` webhook fires for a preview tied to a PR.
  2. 2The associated commit SHA and PR number are read from the deployment metadata.
  3. 3A pending commit status is posted to GitHub so reviewers see the check is running.
  4. 4The synthetic suite runs against the preview URL and metrics are compared to baseline budgets.
  5. 5A branch resolves to pass or fail.
  6. 6A success or failure commit status is written back to GitHub with the metric summary in the description.

Set it up

What you configure once, before turning it on.

  1. 1
    Connect VercelDeploys, runtime logs, analytics.
  2. 2
    Connect GitHubRepos, issues, pull requests, actions.
  3. 3
    Set each agent's modelWe leave models unset so you pick the tier — fast + cheap, or top-quality.
  4. 4
    Tune it to your dataEdit the prompts, filters, and field mappings so it matches how your team works.
  5. 5
    Test, then turn it onRun once against a sample, confirm the output, then enable the trigger.

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