gsd-add-phase

To add a new phase to a project roadmap, the skill creates a phase directory under .planning/phases, updates ROADMAP.md with the new entry, and increments the phase count in STATE.md.

When extending a project plan with a new phase, STATE.md is automatically updated with the new phase count to ensure the project's state management remains accurate and sequential.

Project planning automation validates that the phase number is new and sequential before creating the phase directory, preventing duplicate or out-of-order phases in your roadmap.

Yes, you need an existing ROADMAP.md file before adding a phase directory, because the skill verifies its presence and updates it to reflect the newly added project phase.

The best way to automate creating a phase directory with a placeholder file is using this skill, which creates the directory at .planning/phases/<NN>/ and adds a .gitkeep file automatically.