A feature requires coordinated changes to a validator, an API route, and its tests. The developer wants Copilot to inspect the repository, make edits, and iterate on test failures in the IDE. Which capability best fits?

1. Add the feature request to content exclusions.
2. Accept a single inline completion in the route file.
3. Use an agent workflow with the relevant tools enabled and review the resulting changes.
4. Generate a pull request summary before making changes.