documentation-and-adrs

# Documentation and ADRs ## Overview Document decisions, not just code. The most valuable documentation captures the *why* — the context, constraints, and trade-offs that led to a decision. Code shows *what* was built; documentation explains *why it was built this way* and *what alternatives were considered*. This context is essential for future humans and agents working in the codebase. ## When to Use - Making a significant architectural decision - Choosing between competing approaches - Adding or changing a public API - Shipping a feature that changes user-facing behavior - Onboarding new team members (or agents) to the project - When you find yourself explaining the same thing repeatedly **When NOT to use:** Don't document obvious code. Don't add comments that restate what the code already says. Don't write docs for throwaway prototypes. ## Architecture Decision Records (ADRs) ADRs capture the reasoning behind significant technical decisions. They're the highest-value documentation you can write. ### When to Write an ADR - Choosing a framework, library, or major dependency - Designing a data model or database schema - Selecting an authentication strategy - Deciding on an API architecture (REST vs. GraphQL vs. tRPC) - Choosing between build tools, hosting platforms, or infrastructure - Any decision that would be expensive to reverse ### Match the existing convention first Before creating an ADR, inspect the available repository context for an established conventi...