Vercel Deploy Pipeline

You own the ship step of a curated "Next.js app on Vercel" workflow. This is not the official Vercel CLI plugin re-stated — it sequences the platform into one opinionated path: build a preview, prove it, promote the same artifact to production, and keep a one-command escape hatch. The governing rule is promote, don't rebuild: a deployment is immutable, so the bytes you tested in preview are the exact bytes you put in front of users. Rebuilding to "release" reintroduces every risk you just verified.

Trigger eagerly on anything about deploying a Next.js app to Vercel, promoting preview to production, rolling back, building with --prebuilt, canary / staged rollouts, or wiring vercel into CI. Hand off the adjacent concerns: vercel-env-management owns env vars and vercel env pull; vercel-ai-gateway owns model routing; vercel-edge-and-isr owns ISR / Cache Components and runtime placement; vercel-firewall-and-botid owns WAF/BotID; next-on-vercel-perf owns Fluid Compute cold-start and bundle tuning.

Platform facts this skill assumes (current as of 2026)

• Runtime: Node.js 24 LTS is the default (18 is deprecated). Default function

maxDuration is 300s on every plan. Default to Fluid Compute (full Node.js, instance reuse for fewer cold starts) — Edge Functions are deprecated; do not reach for them.

• Config: prefer vercel.ts (import { ... } from '@vercel/config');

vercel.json still works and is fine for CI-only settings.

• Deployments are immutable. Promotion and rollback re-point the production

alias at an existing deployment — they never rebuild. That is the whole reason rollback is instant.

• Rolling Releases is GA (Jun 2025): staged/canary traffic shifting to a new

production deployment, automatic (time-based) or manual-approval stages.

The pipeline (run in order)

1. Build a preview deployment

Every change goes through a preview first. From a feature branch:

vercel deploy            # preview build + deploy; prints a unique preview URL

Git-connected projects already do this on every push/PR — let the Git integration build previews and reserve the CLI for promotion, rollback, and CI. Preview URLs are immutable and shareable; this URL is the artifact you will promote.

2. Prove the preview before it is allowed near production

Do not promote on vibes. Inspect, hit real routes, and check error logs on the preview deployment:

vercel inspect <preview-url>                                  # status, build, aliases
vercel curl /api/health --deployment <preview-url>            # bypasses deploy protection
vercel logs --deployment <preview-url> --level error --limit 50

If anything is red here, fix and redeploy a new preview. Promotion should be boring.

3. Promote the same deployment to production

This is the heart of the pipeline. Re-point the production alias at the preview you just verified — no rebuild:

vercel promote <preview-url> --yes        # --yes skips the confirm prompt (CI-safe)
vercel promote status                     # confirm the promotion landed

vercel deploy --prod is the build-and-release-in-one alternative; use it for the trivial path (small project, trunk-based, no separate verification gate). For anything with a review gate, build once in preview, then `vercel promote` so the released bytes equal the tested bytes.

4. Keep the instant-rollback escape hatch ready

Because deployments are immutable, rollback is an alias re-point, not a revert commit — it restores service in seconds while you debug at leisure:

vercel rollback                                   # roll back to the previous production deployment
vercel rollback <good-deployment-url-or-id>       # or target a specific known-good one
vercel rollback status                            # confirm the alias moved

When you do not know which deployment broke, binary-search instead of guessing:

vercel bisect --good <good-url> --bad <bad-url>                 # interactive
vercel bisect --good <good-url> --bad <bad-url> --run ./test.sh # exit 0=good, non-0=bad, 125=skip

Roll back first, find root cause second. A green production beats a clever diagnosis.

5. Build once, deploy with --prebuilt (decouple build from deploy)

When CI already runs next build, do not pay for the build twice. Build locally / in CI, then upload the prebuilt output so Vercel skips its build step:

vercel pull --yes --environment=production   # fetch project settings + env into .vercel/
vercel build --prod                          # produces .vercel/output (Build Output API)
vercel deploy --prebuilt --prod              # upload + deploy that output, no remote build

Match the vercel build target to the deploy target: --prod on both for production, neither for preview. --prebuilt is what makes CI deploys fast and makes the artifact you tested the artifact you ship.

6. Stage the rollout with Rolling Releases (canary)

For high-traffic or risky changes, shift production traffic gradually instead of a 100% cutover. Configure stages once per project (CLI shown; the dashboard and REST API do the same):

# Automatic, time-based: 10% for 5m, 50% for 10m, then 100%
vercel rolling-release configure --cfg '{"enabled":true,"advancementType":"automatic","stages":[{"targetPercentage":10,"duration":5},{"targetPercentage":50,"duration":10},{"targetPercentage":100}]}'

# Or manual approval between stages (you gate each advance)
vercel rolling-release configure --enable --advancement-type=manual-approval --stage=10

Then deploy to production and start the rolling release so the new deployment becomes a canary — it takes the first stage's traffic share while the previous production serves the rest:

vercel deploy --prod                              # deploy the new production candidate
vercel rolling-release start --dpl <canary-url>   # begin the staged rollout for that deployment
vercel rolling-release fetch                      # current stage + traffic split

Advance, complete, or abort by traffic-watching the canary. Every command targets the specific deployment with --dpl:

vercel rolling-release approve --dpl <canary-url> --currentStageIndex 0   # advance one stage (manual-approval)
vercel rolling-release complete --dpl <canary-url>                        # promote the canary to 100% production
vercel rolling-release abort --dpl <canary-url>                           # instant rollback: all traffic back to old prod

A rolling release is just a gated promotion — same immutable-deployment model, same instant-undo. Aborting is step 4 applied to a canary. Watch the canary's error rate (vercel rolling-release fetch plus vercel logs --environment production --level error --since 5m) before advancing.

7. Wire it into CI

Encode steps 1-5 as a workflow so humans never hand-run a production deploy. Pattern: PR → preview deploy + checks; merge to main → prebuilt production deploy. See the runnable GitHub Actions template below. Store VERCEL_TOKEN, VERCEL_ORG_ID, VERCEL_PROJECT_ID as CI secrets; runtime app env vars belong in Vercel and are pulled by `vercel pull` — manage those with vercel-env-management, not in the workflow file.

Quality bar

A deploy pipeline is A+ only when all hold:

• Promote, don't rebuild. Production runs a deployment that was first built and

verified as a preview (vercel promote / --prebuilt), not a fresh --prod build whose bytes nobody has seen.

• Every promotion is gated by an inspect + real-route check + error-log scan on

the preview (step 2). No green checks, no promote.

• Rollback is one command and rehearsed. The team knows vercel rollback and has

run it at least once on purpose, not for the first time during an incident.

• CI deploys are non-interactive: --yes on prompts, target flags

(--prod/none) consistent between vercel build and vercel deploy, secrets in the CI store.

• Risky changes ship as a canary (Rolling Releases) with a watched first stage,

not a 100% cutover.

• No stale runtime claims. Functions default to Node.js 24 + Fluid Compute;

nothing in the pipeline pins Node 18 or routes new code onto Edge Functions.

Do NOT

• Do NOT run a fresh vercel deploy --prod to "release" a change you already built and

tested in preview — promote the existing deployment so released bytes equal tested bytes.

• Do NOT debug a broken production before rolling back. Run vercel rollback to

restore service, then investigate.

• Do NOT mismatch build/deploy targets: vercel build (preview) + vercel deploy --prebuilt --prod

ships a preview build to production. Keep --prod on both or neither.

• Do NOT bake runtime app secrets into the CI workflow or vercel.json — they live in

Vercel and arrive via vercel pull. That is vercel-env-management's job.

• Do NOT target deprecated Edge Functions or pin Node 18 for new functions; default

to Fluid Compute on Node.js 24.

• Do NOT hand-promote production from a laptop once CI exists — the workflow is the

source of truth; manual promote/rollback is the break-glass path.

• Do NOT treat a rolling release as fire-and-forget: watch the canary's error rate

before approve/complete, and abort the moment it regresses.

Artifact: preflight gate script

Self-contained Bash. Save as promote-gate.sh, run as ./promote-gate.sh <preview-url>. It runs the step-2 checks and only prints the exact vercel promote command when the preview passes — so a human (or CI) never promotes an unproven deployment. Needs the Vercel CLI logged in (vercel login) and a linked project. No other dependencies.

#!/usr/bin/env bash
# Gate a preview deployment before promotion. Usage: ./promote-gate.sh <preview-url> [health-path]
set -euo pipefail

URL="${1:?usage: ./promote-gate.sh <preview-url> [health-path]}"
HEALTH="${2:-/api/health}"

echo "==> Inspecting $URL"
vercel inspect "$URL" >/dev/null || { echo "FAIL: deployment not inspectable"; exit 1; }

echo "==> Hitting $HEALTH (deploy-protection bypassed)"
if ! vercel curl "$HEALTH" --deployment "$URL" >/dev/null 2>&1; then
  echo "FAIL: health route $HEALTH did not respond 2xx"; exit 1
fi

echo "==> Scanning error logs"
ERRS="$(vercel logs --deployment "$URL" --level error --limit 50 2>/dev/null | grep -c . || true)"
if [ "${ERRS:-0}" -gt 0 ]; then
  echo "FAIL: $ERRS error log line(s) on the preview — fix before promoting"; exit 1
fi

echo "==> PASS. Promote the SAME deployment (no rebuild) with:"
echo "    vercel promote $URL --yes && vercel promote status"

Worked example output

$ ./promote-gate.sh https://acme-7gk2qz.vercel.app
==> Inspecting https://acme-7gk2qz.vercel.app
==> Hitting /api/health (deploy-protection bypassed)
==> Scanning error logs
==> PASS. Promote the SAME deployment (no rebuild) with:
    vercel promote https://acme-7gk2qz.vercel.app --yes && vercel promote status

Read it: the preview was inspectable, its health route returned 2xx, and there were no error-level logs — so the gate emits the promote command for the exact URL it verified. A failing health check or any error line exits non-zero and prints no promote command, so CI stops and nothing reaches production.

Template: CI deploy workflow (GitHub Actions)

Drop in .github/workflows/deploy.yml. PRs get a verified preview; merges to main get a prebuilt production deploy (build once, deploy that output). Set VERCEL_TOKEN, VERCEL_ORG_ID, VERCEL_PROJECT_ID as repo secrets. Runtime app env vars are NOT here — they live in Vercel and are fetched by vercel pull (see vercel-env-management).

name: Deploy
on:
  push:
    branches: [main]
  pull_request:

env:
  VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
  VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}

jobs:
  preview:
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: 24 }          # Node.js 24 LTS — matches the runtime default
      - run: npm i -g vercel@latest
      - run: vercel pull --yes --environment=preview --token=${{ secrets.VERCEL_TOKEN }}
      - run: vercel build --token=${{ secrets.VERCEL_TOKEN }}
      - name: Deploy preview (prebuilt)
        run: |
          URL=$(vercel deploy --prebuilt --token=${{ secrets.VERCEL_TOKEN }})
          echo "Preview: $URL"
          # gate before this preview is allowed to be promoted by the prod job
          vercel inspect "$URL" --token=${{ secrets.VERCEL_TOKEN }}

  production:
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: 24 }
      - run: npm i -g vercel@latest
      - run: vercel pull --yes --environment=production --token=${{ secrets.VERCEL_TOKEN }}
      - run: vercel build --prod --token=${{ secrets.VERCEL_TOKEN }}     # build once
      - name: Deploy production (prebuilt, same bytes)
        run: vercel deploy --prebuilt --prod --token=${{ secrets.VERCEL_TOKEN }}
      # Rollback is intentionally a manual break-glass step:
      #   vercel rollback --token=$VERCEL_TOKEN && vercel rollback status

Fill in the secrets, commit, and the pipeline runs steps 1-5 on every change. Add a manual-approval environment around the production job, or swap the prod deploy for a Rolling Release (step 6), when a change needs a canary instead of a cutover.