CI CD And Automation

CI/CD and Automation

Overview

Build and deployment pipelines should enforce quality automatically. Apply Shift Left principles (catch issues early), use feature flags for safe releases, and make the pipeline the authority on whether code is ready to ship.

When to Use

• Setting up CI/CD for a new project
• Modifying existing build or deploy pipelines
• Adding quality gates or automated checks
• Troubleshooting pipeline failures

Core Principles

Shift Left

Catch issues as early as possible:

• Lint and format on save or pre-commit
• Run type checks locally before push
• Run unit tests on every push
• Run integration tests on every PR
• Run security scans on merge to main

Faster is Safer

Small, frequent deployments are safer than large, infrequent ones:

• Automate the deployment process completely
• Make rollbacks trivial
• Deploy to staging automatically on merge
• Deploy to production with a single approval or automatically

Feature Flags

Use feature flags for:

• Incomplete features merged to main
• A/B testing and gradual rollouts
• Kill switches for new functionality
• Environment-specific behavior

Quality Gate Pipeline

Standard pipeline stages:

1. Lint and format check
2. Type check
3. Unit tests with coverage
4. Build
5. Integration tests
6. Security scan
7. Deploy to staging
8. Smoke tests
9. Deploy to production

Process

Step 1: Define Pipeline Stages

• List all automated checks the project needs
• Order them fastest-failing-first
• Ensure each stage has clear pass/fail criteria

Step 2: Implement Fast Feedback

• Ensure lint and type checks run in under 30 seconds
• Ensure unit tests run in under 2 minutes
• Provide clear error output for each failure

Step 3: Add Deployment Automation

• Automated staging deployment on merge
• Automated production deployment with approval gate
• Rollback procedure that can execute in under 1 minute

Step 4: Monitor Pipeline Health

• Track build success rates
• Track mean time to recovery from failures
• Alert on pipeline failures that block merges

Common Rationalizations

Verification

• Pipeline runs on every push and PR
• Fastest checks run first
• Each stage has clear pass/fail criteria
• Deployment is fully automated
• Rollback takes under 1 minute

Anti-Rationalization Table

Imported from cursor-team-kit/loop-on-ci (MIT, cursor/plugins)

Loop on CI

Trigger

Need to watch a branch or pull request and iterate on CI failures until all required checks are green.

Use gh pr checks as the source of truth. It includes all PR-attached checks, while gh run list only covers GitHub Actions.

Workflow

1. Resolve the PR for the current branch.
2. Inspect current PR checks before waiting.
3. If checks already failed, diagnose those failures first.
4. If checks are pending, watch with gh pr checks --watch --fail-fast.
5. After each push, re-check the full PR check set and repeat until green.

Commands

# Resolve the active PR
gh pr view --json number,url,headRefName

# Inspect all attached checks
gh pr checks --json name,bucket,state,workflow,link

# Watch pending checks and fail fast
gh pr checks --watch --fail-fast

# GitHub Actions logs, when the failing check links to a GHA run
gh run view <run-id> --log-failed

Guardrails

• Keep each fix scoped to a single failure cause when possible.
• Do not bypass hooks (--no-verify) to force progress.
• If the failure is clearly unrelated to the PR and appears fixed on main, merge latest main instead of bloating the PR with unrelated fixes.
• If failures are flaky, retry once and report flake evidence.
• Re-run gh pr checks --json name,bucket,state,workflow,link after every push; the check set can change.

Output

• Current CI status
• Failure summary and fixes applied
• PR URL once checks are green

Imported from cursor-team-kit/fix-ci (MIT, cursor/plugins)

Fix CI

Trigger

Branch or PR CI is failing and needs a fast, iterative path to green checks.

Workflow

1. Resolve the active PR and inspect gh pr checks --json name,bucket,state,workflow,link.
2. Inspect failed jobs and extract the first actionable error. Use GitHub Actions logs when available; otherwise use the check link to identify the failing command or service.
3. Apply the smallest safe fix.
4. Push, re-check the PR check set, and repeat until green.

Guardrails

• Fix one actionable failure at a time.
• Prefer minimal, low-risk changes before broader refactors.
• Keep gh pr checks as the source of truth for overall PR CI state.

Output

• Primary failing job and root error
• Fixes applied in iteration order
• Current CI status and next action