Agent Instructions File
A repository or workspace file (often AGENTS.md) that gives coding agents durable project rules, commands, conventions, and boundaries.
Plain English
It is the project handbook the agent reads before touching the code.
Example
An `AGENTS.md` tells the agent the project uses Bun, where routes live, and which generated files must not be edited.
Why it matters
Shared instruction files make multi-tool agent workflows consistent; stale or overloaded instructions become context debt.