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by Vercel Labsvercel-labs/vercel-plugin295 stars
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Vercel CLI expert guidance. Use when deploying, managing environment variables, linking projects, viewing logs, querying metrics, managing domains, managing feature flags with vercel flags, or interacting with the Vercel platform from the command line.

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  • Updated 2 weeks ago
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referencesmonitoring-and-debugging.md

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Monitoring & Debugging

Diagnostic Ladder

For production issues, start broad and narrow with bounded commands:

  1. Identify project and scope.
  2. List recent deployments: vercel list <project> --scope <team> --status READY --format json.
  3. Inspect the relevant deployment: vercel inspect <deployment-url>.
  4. Check logs for a bounded window: vercel logs <deployment-url> --since 1h --limit 100 --json.
  5. If metrics are available, inspect schema first, then query a relevant metric with a bounded time window and group-by.
  6. If logs or metrics are unavailable, report the permission, subscription, retention, or no-data limitation and use deployments, activity, or inspect output as fallback evidence.

Build Failure Ladder

For deployment build failures, start from deployment evidence before source control exploration:

  1. Inspect deployment metadata: project, team/scope, branch, commit, target, status, timestamp, and aliases.
  2. Inspect build logs with vercel inspect <deployment-url> --logs.
  3. Capture install command, package manager version, build command, monorepo/Turbo scope, restored build cache ID, and the first fatal error.
  4. Reduce the first fatal error before chasing warnings.
  5. If source is implicated, inspect only the app/package files, lockfile, build config, and files named in the trace.
  6. Compare with a nearby successful deployment of the same project: commit, cache ID, install command, package manager version, build command, package scope, and source provenance.
  7. Separate proven root cause from likely trigger.

For branch-specific failures, "other branches pass" does not by itself disprove the root cause. Compare cache IDs, install graphs, lockfile/package diffs, build command, package scope, and source provenance before explaining why one branch fails.

Use confidence language in conclusions:

  • Logs prove <root cause>.
  • Branch comparison shows <facts>.
  • Likely trigger is <hypothesis>.
  • Not yet proven is <remaining uncertainty>.
  • Validate by <specific redeploy/test/check>.

Useful discovery commands:

vercel logs --help
vercel metrics --help
vercel metrics schema --format=json
vercel metrics schema <metric-or-prefix> --format=json
vercel activity --help
vercel activity types --format json --scope <team>
vercel usage --help
vercel httpstat /api/health --deployment <deployment-url>

Logs

vercel logs <deployment-url>                   # view logs
vercel logs --follow                           # stream live
vercel logs --level error --level warning      # filter by severity (error, warning, info, fatal)
vercel logs --source serverless                # filter by source (serverless, edge-function, edge-middleware, static)
vercel logs --since 2024-01-01                 # filter by time
vercel logs --query "timeout"                  # search

With --follow and no deployment, the CLI tries the latest deployment on the current Git branch, your latest deployment, then the latest production deployment. Use --environment production or --environment preview to constrain automatic resolution.

In agents, pipes, and CI, log messages expand automatically; do not add --expand solely for non-TTY output.

Use --follow only for live debugging. Historical log queries should be bounded with --since, --until, and --limit.

Metrics

Inspect schema before querying unfamiliar metrics. Use bounded time windows and group limits when grouping results.

vercel metrics schema                                                    # list available metrics
vercel metrics schema vercel.function_invocation                         # inspect a metric prefix
vercel metrics vercel.function_invocation.count --since 1h               # query linked project
vercel metrics vercel.function_invocation.count -f "http_status ge 500" --group-by error_code --since 1h --format=json
vercel metrics vercel.function_invocation.request_duration_ms -a avg --group-by route --since 1h
vercel metrics --all vercel.function_invocation.count --group-by project_id --since 24h

Inspecting Deployments

vercel inspect <url>               # deployment details
vercel inspect <url> --wait        # wait for completion
vercel inspect <url> --logs        # show build logs

If a redeploy is meant to validate a build-cache or branch-specific hypothesis, inspect or wait until the new deployment reaches Ready or Error; do not stop at Building unless the user only asked to start the deployment.

vercel curl — Access Preview Deployments

Use vercel curl to access preview deploys. It handles deployment protection automatically — no need to disable protection or manage bypass secrets.

vercel curl /api/health --deployment $PREVIEW_URL
vercel curl /api/data --deployment $PREVIEW_URL -- -X POST -d '{"key":"value"}'

Do not disable deployment protection. Use vercel curl instead.

Finding Regressions

vercel bisect performs a binary search across deployments to find which one introduced a problem:

vercel bisect --good <url> --bad <url> --path /api/users
vercel bisect --run ./test-script.sh    # automated testing

Cache

vercel cache purge --type cdn --yes      # purge CDN cache
vercel cache invalidate --tag mytag --yes # invalidate by cache tag

See references/project-infra.md for destructive cache deletion and other project infrastructure commands.

Source: SKILL.md on GitHub

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Provenance

Signed by skilld at 51524a1. This ties the file your Agent reads to that commit on GitHub. It does not review the instructions.

Last checked against GitHub 8 hours ago.

Activeupdated 2 weeks ago

Capability

Other metadata
metadata
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retrieval
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chainTo
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    "targetSkill": "vercel-functions",
    "message": "Functions configuration detected in vercel.json — loading Vercel Functions guidance for runtime options, streaming, and Fluid Compute.",
    "skipIfFileContains": "\"crons\"\\s*:"
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