Open Horizons Backstage Core Contribution

Backstage core contribution

Follow the upstream repository's contributor contract and avoid commands that perform broad build or release mutation.

When to invoke

• "Make a change in backstage/backstage."
• "Validate this Backstage core PR."
• "Add a changeset or update API reports."
• "Fix a core plugin, package, or documentation issue."

Positive detection

Use this skill only when repository evidence identifies backstage/backstage or a close fork with the core package layout. Adopter apps use their own package scripts instead.

Procedure

1. Read root package.json, CONTRIBUTING.md, SECURITY.md, package ownership, and affected package scripts.

2. Verify the exact checkout commit and Backstage version.

3. Establish a targeted baseline:

   yarn install
   CI=1 yarn test <path>
   yarn tsc
   

4. Make the smallest package-scoped change and preserve public API and compatibility contracts.

5. Format only changed files and run yarn lint --fix according to contributor guidance.

6. Rerun targeted tests and exact root yarn tsc without extra options.

7. Run yarn build:api-reports when public APIs change and review generated report diffs.

8. Add direct changeset files when published packages change.

9. Preserve Apache-2.0 headers, DCO sign-off, documentation, and test expectations.

10. Review the final diff for unrelated generated output or release mutations.

Prohibited routine commands

• Root yarn build.
• yarn release.
• changeset version or equivalent version mutation.
• Repository-wide formatting when only changed files are required.
• Untargeted test suites when a package or path selector covers the change.

Open Horizons integration

• Scope core contributions to the Developer IDP or Agent IDP objective and current Horizon stage.
• Preserve Open Horizons Backstage ownership, compatibility, and evidence boundaries where applicable.
• Route cross-domain sequencing through open-horizons-orchestration (skill).

Output template

## Backstage core contribution result

**Commit:** <checkout commit>
**Packages:** <affected packages>

| Contributor gate | Command | Result |
| --- | --- | --- |

### Generated artifacts
- Changeset:
- API reports:
- Documentation:

Quality gate

• Repository identity, commit, and affected package ownership are confirmed.
• Baseline and final targeted tests pass.
• Root typecheck ran only as exact yarn tsc.
• Formatting is limited to changed files and lint results are recorded.
• API reports and direct changesets are updated when required.
• DCO and Apache header requirements are satisfied.
• No root build, release, or changeset-version command ran.