spec-kit-implement

Execute the task list from tasks.md following TDD and the FRAMEWORK.md change workflow.

Input: Optionally specify a change name. If omitted, infer from context or ask.

Steps

1. Load artifacts

   Load specs/changes/<name>/tasks.md, plan.md, and spec.md.

   If tasks.md is missing or incomplete, prompt to use the spec-kit-tasks skill first.

2. Show current progress

   Display:

   • Change name
   • Progress: "N/M tasks complete"
   • Remaining tasks overview

3. Execute tasks phase by phase

   For each pending task, in dependency order:

   • Announce the task being worked on.
   • Follow TDD: write the failing test first, implement the minimum to pass, then refactor.
   • Keep changes minimal and scoped to the task.
   • Respect layer boundaries: domain → application → infrastructure. Never invert.
   • Mark complete in tasks.md: - [ ] → - [x].

   Parallel tasks ([P]) may be executed concurrently.

   Pause if:

   • A task is unclear — ask for clarification before implementing.
   • Implementation reveals a design issue — suggest updating plan.md.
   • A test fails unexpectedly — report and wait for guidance.
   • User interrupts.

4. On completion, sync canonical specs

   When all tasks are complete:

   • Update or create specs/features/<name>/spec.md to reflect the implemented behavior.
   • Use the spec format from FRAMEWORK.md (WHEN/THEN scenarios, RFC 2119 language).
   • Verify architecture boundaries still hold and tests pass.

Output During Implementation

## Implementing: <change-name>

Task 3/7: <description>
[implementation]
✓ Done

Task 4/7: <description>
[implementation]
✓ Done

Output On Completion

## Complete: <change-name>

7/7 tasks complete.
specs/features/<name>/spec.md updated.

Definition of done:
✓ Tests written before implementation
✓ Architecture boundaries hold
✓ specs/features/ updated

Guardrails

• TDD is non-negotiable. Never write implementation before the failing test.
• Halt on non-parallel task failures — do not skip ahead.
• Update task checkbox immediately after completion.
• Protect the domain model first; adapt infrastructure around it.
• specs/features/ MUST be updated before the work is considered done.