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last-20-percent

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Finds and finishes the last 20% of a built solution — the experiential layer agents skip: what the output actually reads like, which pages or screens should exist, first-run and empty states, opinionated defaults, the golden path. Use when planning any build so the magic gets specced as concretely as the plumbing, before calling any build "done", when a solution works but feels like a demo, or when the user says "last 20%", "finish this", "make it actually good", "is this actually done", or "why does this feel flat".

skills/last-20-percent/SKILL.md

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# The Last 20%

Agents reliably deliver the first 80% of a solution — the ingestion, the endpoints, the schema, the pipeline — and quietly skip the 20% that makes it something a person would love. Asked for an enterprise knowledge wiki, an agent builds the crawler, the embeddings, the LLM synthesis layer, and never once asks what a wiki page should *read like*, which pages should exist, or how someone finds an answer on day one. The result compiles, passes tests, demos fine, and is dead on arrival.

This skill exists to find that 20%, spec it as concretely as the plumbing, and finish it.

## Why the 20% gets skipped

The failure is structural, so the countermeasures must be too:

1. **Tasks come from the noun.** Decomposing "wiki" yields ingestion, storage, search, generation. The experience of *using* the wiki never appears in that decomposition — so it never becomes a task, so it never gets done.
2. **"Done" is defined by what's checkable.** A test can assert a 200 response. It cannot assert "this page answers the question in its first paragraph." Work without done-criteria silently drops off the plan.
3. **Taste feels like overreach.** Deciding what a page should read like is a product judgment. Models hedge: they build "flexible" machinery and defer every real decision to a user who asked precisely because they wanted those decisions made.
4. **The 20% is scheduled last, and last gets cut.** Even when the experiential work is named, it lands at the end of the plan — exactly where context, budget, and attention run out.
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