Github Manager

GitHub Manager

CI validates what cannot be cheaply verified locally. It is not a remote test runner for every commit.

This skill enforces disciplined, cost-aware GitHub operations. It turns GitHub from a free-for-all into a governed delivery surface: selective automation, traceable issues, consistent labels, and protected mainlines.

When to use

• Setting up or revising a repository's CI/CD workflow
• Investigating unexpected GitHub Actions spend
• Creating or triaging issues and defining acceptance criteria
• Designing a label taxonomy or branch-protection policy
• Preparing a release process or tag strategy

Operating model context

This skill governs the GitHub surfaces that enforce the harness contract at the repository level. It is not general DevOps housekeeping — each procedure below maps to a harness invariant:

• Branch protection + required status checks are the enforcement mechanism for the PR review gate and the exact-candidate binding rule. A CI check that passes on an unprotected branch is a claim; a passing check required by branch rules is evidence.
• CI receipts are delivery evidence. "It worked locally" is not an artefact. A CI run tied to a commit SHA is. Structure your workflow so evidence is machine-readable and SHA-bound, not dependent on a contributor's local environment.
• Modifying branch protection, CI pipelines, or billing settings is an R2 action. These changes affect all contributors and shared infrastructure. Classify risk, confirm authority, and record the decision before any write.

Use release-readiness to gate a specific deployment. Use this skill to configure and audit the repository surfaces that make those gates trustworthy.

Procedure

1. Rightsize CI triggers

• Push to default branches should run lightweight gates only (lint, typecheck, unit tests).
• Pull requests and version tags run the full pipeline, including packaging and cross-platform smoke tests.
• Feature branches do not fire CI on every push; open a PR when ready for validation.
• Path filters skip irrelevant jobs: docs-only changes should not rebuild the extension, code-only changes should not re-render documentation.

2. Minimise Actions billing

• Know the runner multipliers: Linux ×1, Windows ×2, macOS ×10.
• Gate expensive runners (macOS, Windows) behind PRs and releases, not every push.
• Cache dependency stores (cache: 'pnpm', cache: 'npm', pip, etc.).
• Do not run local-integration or exploratory tests in CI; keep them local or on-demand.
• Set a spending limit and billing alert before usage surprises you.

3. Structure issues and tracking

• Every issue states a problem or outcome and has acceptance criteria.
• Link PRs to issues (Closes #123 or Refs #123).
• Close issues with a concise note explaining what changed and where.
• Use milestones or projects for release-scope tracking, not long-lived catch-all issues.

4. Label consistently

Adopt a namespaced taxonomy and avoid one-off labels:

5. Protect the mainline

• Require PR reviews before merging to main.
• Require status checks to pass (lint, typecheck, test).
• Use squash or rebase merges for a linear history; avoid merge commits unless the project explicitly allows them.
• Restrict force-push and deletion on default branches.

6. Define the release workflow

• Tags (v*) trigger release builds and deployments, not manual uploads.
• A release checklist verifies version alignment, changelog entry, and rollback plan.
• Generated artifacts (VSIX, containers, packages) are produced by CI, not a local workstation.

Outputs

• CI trigger matrix: event → jobs that run
• Monthly Actions cost estimate with runner-multiplier breakdown
• Issue template with acceptance criteria
• Label taxonomy
• Branch-protection policy
• Release checklist

Guardrails

• Local testing is not CI. If a check belongs on a developer's machine, do not run it on every push.
• macOS minutes are the silent budget killer. A one-minute macOS job costs ten billable minutes.
• Unconditional full pipelines scale badly. Every unconditional job is a tax on every future commit.
• Labels without a taxonomy become noise. Delete or consolidate labels that do not fit the scheme.
• Never deploy from a local build. Release artifacts must come from CI to be reproducible.

Anti-rationalization table