Describe the current mode
A newly created agent begins in training mode with no concrete task. That keeps learning separate from unsupported autonomous work.
Portable instructions
What belongs in AGENTS.md?
AGENTS.md is the root instruction map: current mode, learning rules, authority boundaries and where the agent should find its approved memory.
Point to authoritative files
The root file should tell the agent to read approved rules, knowledge, examples, procedures, corrections, tests and teacher notes.
State action boundaries
Publishing, sending, purchasing and changing external systems remain human-controlled even when an output is approved.
The practical rule