Copywriter.
A suite of four Claude Code skills that write specific, proof-backed copy instead of generic AI copy, gated by a linter that hard-blocks AI slop before anything ships.
IN PLAIN ENGLISH
What this is.
Copywriter is a set of four Claude Code skills for proof-backed writing. A dependency-free linter blocks known AI-slop patterns before a draft can ship.
01 / THE PROBLEM
Better prompting does not fix weak inputs.
Generic AI copy sounds generic because it is the statistical average of generic inputs. Copywriter makes the quality bar explicit: start with evidence, keep claims honest, and give each surface a job instead of asking for nicer adjectives.
02 / HOW IT WORKS
Four skills, one shared source.
The system separates proof discipline, reader relevance, structure, and voice. A shared install source copies the voice file, forbidden list, linter, and swipe corpus into each skill so an update cannot leave an installed copy stale.
03 / ENGINEERING DECISIONS
The model does not get to grade itself.
A small Python linter, with no model in the loop, hard-blocks em dashes, spaced-hyphen substitutes, negative-parallelism reframes, dead vocabulary, dead phrases, and unresolved proof placeholders. A twelve-test quality bar prints evidence, and revisions stop after three passes when the upstream proof is not strong enough.
04 / WHERE IT STANDS
Built and in use as an internal writing engine.
The engine, voice model, forbidden list, quality gate, and linter are built. The honest output is sometimes a blocker: “targeting this month” must not become “shipping this month” because the latter reads better.
THE HONEST VERSION
What I am actually counting.
The useful feature is the hard stop. A clean lint run is a release condition, not a decorative score beside copy that still makes claims the evidence cannot support.
TRY IT
Try the interaction.
Interactive demo loading. The case-study explanation remains available without JavaScript.
TOOLS AND CONSTRAINTS
- Claude Code skills
- Python
- Deterministic linting
- Proof gates
- Shared install source