Gh Actions Permissions

GitHub Actions Permissions Management

Manage GitHub Actions workflow permissions via gh CLI API, specifically for enabling Actions to create and approve pull requests.

Common Issue

When GitHub Actions workflows (like release-please) fail with:

GitHub Actions is not permitted to create or approve pull requests

This occurs when the repository's workflow permissions block PR creation, even if the workflow file has correct permissions: declarations.

Check Current Permissions

View the current workflow permission settings:

gh api repos/{owner}/{repo}/actions/permissions/workflow \
  --jq '{default_workflow_permissions: .default_workflow_permissions, can_approve_pull_request_reviews: .can_approve_pull_request_reviews}'

Expected output:

{
  "default_workflow_permissions": "read",
  "can_approve_pull_request_reviews": false
}

When can_approve_pull_request_reviews is false, workflows cannot create PRs regardless of workflow-level permissions.

Enable PR Creation Permission

Use PUT method (not PATCH) to update the setting:

gh api --method PUT repos/{owner}/{repo}/actions/permissions/workflow \
  -F default_workflow_permissions=read \
  -F can_approve_pull_request_reviews=true

Important:

• Must use PUT method, not PATCH (PATCH returns 404)
• Must provide both parameters even if only changing one
• Requires repo scope in gh CLI authentication

Verify the change:

gh api repos/{owner}/{repo}/actions/permissions/workflow \
  --jq '.can_approve_pull_request_reviews'

Should return: true

Permission Levels Explained

default_workflow_permissions: Controls base permissions for GITHUB_TOKEN

• read: Read-only access (recommended for security)
• write: Read and write access

can_approve_pull_request_reviews: Allows workflows to create/approve PRs

• false: Workflows cannot create or approve PRs (default, more secure)
• true: Workflows can create and approve PRs (needed for release automation)

Workflow Architecture

Even when can_approve_pull_request_reviews is enabled, workflow files should explicitly declare permissions:

permissions:
  contents: write
  pull-requests: write

This explicit declaration:

• Overrides repository default_workflow_permissions
• Documents required permissions in workflow file
• Follows principle of least privilege

Rerun Failed Workflows

After enabling permissions, rerun the failed workflow:

gh run rerun {run-id}

Or watch the workflow execution:

gh run watch {run-id}

Authentication Requirements

Verify gh CLI has sufficient permissions:

gh auth status

Required token scopes:

• repo - For repository settings access
• workflow - For workflow operations (if managing workflow files)

Refresh authentication if needed:

gh auth refresh -s repo