Methodology-grade business architecture for Claude. Four slash commands that elicit, validate, and visualise a complete business architecture from any business description, no templates or prior models needed. /plausibleba - Guided session producing a Capability Map, Concept Model, and Value Stream in one flow. Exports a single ba-skills-bundle.json. /capability-map - BIZBOK-grounded MECE capability hierarchy (L1–L3) with interactive treemap. Auto-generates XLSX and JSON exports. /concept-model - Business object taxonomy using the Capsicum Triad (Party/Record/Resource). Cross-validates against capability coverage. /value-stream - Staged value delivery with outcome chains, PPIT breakdown, and capability alignment. Each skill includes two validation checkpoints before rendering, auto-generated XLSX/JSON downloads, and recommended next steps to run companion skills. Open source at github.com/plausibleba/ba-skills.