Why a GitHub App Token Beats a Personal Access Token in CI

A GitHub App installation token is scoped to chosen repos, expires in an hour, and belongs to the org, not a person.

A personal access token inherits a user's access and lives for months. A GitHub App installation token is minted per run, scoped to the repos the App is installed on, and revoked automatically when it expires, which shrinks the blast radius if it leaks.

How they differ

Mint one in a workflow

permissions:
  contents: read
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/create-github-app-token@v1
        id: app-token
        with:
          app-id: ${{ vars.APP_ID }}
          private-key: ${{ secrets.APP_PRIVATE_KEY }}
      - uses: actions/checkout@v4
        with:
          token: ${{ steps.app-token.outputs.token }}

When a PAT is still fine

• A throwaway one-off script where setting up an App is overkill.
• A fine-grained PAT scoped to a single repo with a short expiry is a reasonable middle ground.
• Prefer short-lived scoped tokens over long-lived PATs whenever the token touches other repos.

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