now-how

[!WARNING] Experimental documentation pattern. This skill uses an experimental documentation pattern. Install and use it at your own risk.

Generate, update, or consult a project's HOW.md and domain specs — the documentation layer that maps codebase architecture and captures domain knowledge an agent can't get from reading source files alone.

Projects use either docs/ or specs/ for domain specs — not both. Before creating or modifying specs, check which directory the project uses.

Generate, update, or consult a project's HOW.md and domain specs — the architecture map and domain-specific documentation that tells collaborators how the codebase is organized and what they need to know beyond what the code itself shows. Use when the user wants to document the codebase architecture, create or update domain specs, write a HOW.md, map the codebase, keep documentation in sync with code changes, or when you need to understand a project's architecture before answering questions or doing work. Triggers include "now how", "document the architecture", "write specs", "update the docs", "map the codebase", "update the spec for [domain]", "create docs", "how does [X] work in this project", "check the docs first", or "use now-how". Source: h14h/doc-skills.