Claude Code skill · standards-grade

A rough idea in. A build-ready spec out.

specmaster turns an idea — or an existing site, app, or document — into a comprehensive PRD + spec an AI coding agent can build from and verify, not guess at.

Get started → Configure a run

The problem it solves

Most "PRDs" are vague prose. An agent fills the gaps with assumptions — and you get plausible, wrong software.

A typical spec

"The app should be user-friendly and scalable." The agent invents the workflow, the data model, and what "done" means.

A specmaster spec

Every requirement is a testable shall statement with an executable Gherkin acceptance criterion, plus the workflow, top tasks, UX, UI states, data model, and measurable outcomes — each sourced to a real standard.

Configure your run

Pick a lane, describe what you want, and copy the kickoff. specmaster generates the spec inside Claude Code — that's where the agent, your files, and your tools live — and writes downloadable Markdown into a specs/ folder.

[M] MODERNIZE A new thing, or a new way / new audience

[I] IMPROVE Optimize an existing site / app / document

Describe the thing you want to build

Paste this into Claude Code

specmaster runs in Claude Code, not in this page — a spec needs the agent, your files, and your tools. This just frames the kickoff. Don't have the skill yet? Install it in 30 seconds →

What you get — downloadable Markdown

One run folder, everything in .md. Download the PRD, hand the rest to your build agent.

PRD.mdThe spec — your deliverable
requirements.ears.mdTestable EARS requirements, classified, stable IDs
acceptance/*.featureGherkin acceptance — an executable "done"
artifacts/workflow · top-tasks · journeys · UI states · logic-model · architecture+ADRs · data-model+ERD
VALIDATION.mdQuality + traceability + anti-vagueness, time-stamped
MANIFEST.md17-criterion coverage checklist

Built on real standards, not vibes

Every one of the 17 criteria is sourced. It covers the things specs usually drop.

ISO/IEC/IEEE 29148BABOKDAMA-DMBOK arc42C4ISO 9241-210 McGovern Top TasksPuMPWK Kellogg logic model EARSGherkin / BDDMADR