Thin plan
Portable AI-engineering skills for Claude Code, Codex, and coding agents: bounded scope, mini-specs, vertical slices, verification, ship gates, and handoff.
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Convert a mini-spec into 3-7 vertical implementation slices.
SKILL.md
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Thin Plan
Purpose
Convert the mini-spec into 3-7 vertical implementation slices.
When to use
Use when SPEC.md exists and implementation needs a short, ordered path.
Inputs
SPEC.mdCONTEXT.md- Existing repo structure
- Available verification commands
Workflow
- Identify the smallest end-to-end behavior.
- Create 3-7 slices that each produce observable behavior.
- Make every slice independently verifiable.
- Keep each slice to the fewest files possible.
- Avoid horizontal architecture-only tasks unless required.
- Record dependencies, risks, and verification strategy.
- Write
PLAN.mdandTODO.md.
Outputs
PLAN.mdTODO.md
Stop conditions
- Each task has a visible result and a check.
- Planning reveals a missing spec decision.
Anti-patterns
- Planning all backend, then all frontend, then all tests.
- Creating broad tasks that cannot be finished in one session.
- Treating setup work as progress when no behavior changes.