custos

Interactive application design, implementation management, and documentation skill. Guides you through requirements gathering, high-level architecture, detailed component design, implementation tracking, and producing three audiences of documentation (contributors, plugin/activity/connection developers, and end users). Manages GitHub issues, Mermaid diagrams, and version-controlled design and docs. Triggered by phrases like "start design session", "add requirements", "design component <name>", "implementation plan for <component>", "write contributors docs", "write developer docs", "write user docs", "show design status", or directly via /app-design-manager.

Implement an already-designed component end-to-end. Reads design/components/<comp>/ for the source of truth, derives a phased task plan (gate 1), files GitHub task issues + a tracker (gate 2), then autonomously implements each task — branch from main, code + tests, push, PR, wait for Copilot review (default 10 min), address review comments + CI failures, merge, tick tracker, move to next task. Auto-closes the tracker when every task is done. Triggered by phrases like "implement component <name>", "continue implementation", "plan tasks for <component>", or directly via /implement-component.