Your .md Files Are Now Your Most Powerful Engineering Artifact, And You're Probably Ignoring Them

AI assistants like Copilot, Cursor, Claude, and Codeium work from context windows, not institutional memory.

They don't remember earlier conversations, system quirks, or past architectural decisions.

They read the files you give them, so repository files and documentation shape what they can use.

Vibe coding works when context is rich, but it breaks down when context is limited as codebases grow.

The article says AI can do well on day 1, then hallucinate class names and miss architecture by day 30, and need more correction than coding by day 90; well-structured Markdown docs can bridge the gap because Markdown is plain text and avoids XML namespaces, JSON schema rules, and binary data.