train.md

Documentation templates for engineering teams that think before they build.

RFCs, ADRs, technical design docs, C4 diagrams. The artifacts that align teams and survive longer than the code they describe.

Browse all templates

Templates

RFC
Request for Comments — propose changes and build consensus before coding
ADR
Architecture Decision Record — capture choices with context and consequences
Technical Design Doc
Detail implementation approaches, API contracts, and system interfaces
C4 Diagrams
Visualize architecture at four levels — context, container, component, code
Sequence Diagrams
Trace runtime flows and interactions between system components
AI & Agents
AGENTS.md and prompt templates for AI-assisted development