From the source

Multiple AGENT.md Files

Capability change

Amp now supports multiple AGENT.md files, searching in subtrees, parent directories, and ~/.config/AGENT.md, and also recognizes AGENTS.md files.

Users can @-mention files in AGENT.md for additional context.

From the source
Update: Amp now looks in files named AGENTS.md (with an S). Amp now looks for AGENT.md files in subtrees, parent directories, and ~/.config/AGENT.md.
ampcode.com

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