In my experience, neither Claude nor any other agent actually reads AGENTS.md (or CLAUDE.md or anything else) without being told to explicitly every session.
I've sniffed Claude Code's HTTP traffic and confirmed that the CLAUDE.md file content (and AGENTS.md if it is @-referenced) is automatically included in the system prompt without it having to perform any additional file read operations.
I've sniffed Claude Code's HTTP traffic and confirmed that the CLAUDE.md file content (and AGENTS.md if it is @-referenced) is automatically included in the system prompt without it having to perform any additional file read operations.