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define-done

Pin a measurable, outcome-based Definition of Done for a diamond — a behaviour-change that creates value, not a build-list. Problem-first Socratic sequence; writes definition_of_done to the diamond at birth or retrofits it when missing.

plugins/mycelium/skills/define-done/SKILL.md

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# Define Done

Pin an explicit, outcome-based **Definition of Done** for a diamond. "Done" is *a change in human behaviour that creates value* (Seiden), not "the feature shipped" — you're done when it ships **and** has the intended impact (Amplitude). The diamond's implicit done defaults to the harshest, least-controllable bar ("a user shipped a product"), which is both wrong for validating *purpose* and a demotivation engine. This skill makes the bar explicit, measurable, and pre-committed.

This is distinct from `/mycelium:definition-of-done` (the per-feature agile *quality checklist* run at `close`). This skill sets the **outcome bar a whole diamond is judged against**; that one verifies a feature meets quality criteria. Both can apply.

## When to use

- **At diamond birth** — `/mycelium:interview` (L0) and child-diamond spawn (`/mycelium:diamond-progress`) call this before a diamond is "live."
- **Retrofit** — when `/mycelium:canvas-health`, `/mycelium:diamond-assess`, or the SessionStart nudge flags a diamond with no `definition_of_done`.
- Never silent-fill. The *question* is what produces a real bar ("fits, not ships"); a back-filled field is theatre.

## Preflight: Read target file before any Write/Edit