What problem does it solve? Turning a written implementation plan into working code often drifts: stages get skipped, tests go unrun, and half-finished work lands on a red test suite. This Skill executes an existing feature plan stage-by-stage with strict TDD discipline, so every stage is tested, reviewed, and committed before the next begins. ## Core Features & Use Cases - Stage-by-stage TDD execution: Reads the plan and design files from the feature folder, then implements each plan stage test-first — write the test, watch it fail, implement, watch it pass — with one commit per green stage. - Red-baseline protection: Baselines existing test, lint, and type failures before writing code and refuses to build on an already-failing test suite, offering to investigate, file a bug, or halt instead. - Adaptive execution strategy: Runs serial batches as chunked subagent units by default, executes parallel batches concurrently in throwaway git worktrees (up to four at a time), and falls back to direct execution for small or non-delegatable runs. - Use Case: After running /feature-plan for a new reminders feature, invoke /feature-implement to build all staged work on the current branch, resuming automatically from the lowest uncommitted stage if a previous run was interrupted. ## Quick Start Run /feature-implement to build the latest feature that already has a plan, or /feature-implement v3 to target a specific version.
