decompose-into-slices

Decompose an approved milestone plan into the smallest end-to-end vertical slices that span schema, API, UI, and tests. Each slice is independently demoable, enabling early validation and clear handoffs to implementation.

A vertical slice is an end-to-end deliverable spanning all relevant layers like schema, API, and UI. You need vertical slicing when converting a milestone plan into testable deliverables to enable parallel work and early demonstration.

Generate a blocked-by dependency graph by decomposing your milestone into ordered vertical slices. The output roadmap explicitly sequences slices like S01 and S02, ensuring safe parallel work and clear task dependencies.

Yes, this approach requires an existing milestone brief defined in a M###-CONTEXT.md file and an established roadmap. The decomposition logic applies to approved milestone plans to produce properly ordered, testable slices.

Yes, you can export the vertical slices to GitHub issues upon explicit confirmation. The tool writes the M###-ROADMAP.md file by default and optionally creates GitHub issues to track the decomposed milestone tasks.

Add a final integration slice when runtime boundaries are crossed during milestone decomposition. This ensures the vertical slices, which are independently demoable, are properly integrated and tested across the complete system architecture.