How real projects brief Codex, Cursor and every other agent that reads AGENTS.md.
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OpenAIAGENTS.mdopenai/codex/codex-rs/code-mode-host/AGENTS.md
Do not use timeouts or sleeps to synchronize tests. Wait for explicit signals or observable state; let the test runner enforce test-case timeouts.
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OpenAIAGENTS.mdopenai/codex/codex-rs/exec-server/src/sandbox_integrity/AGENTS.md
These checks currently emit telemetry only. Findings and preparation errors must not change sandbox construction, permissions, approvals, or command execution. Supported backends are Seatbelt, bubblewrap, and MXC; legacy Windows is out of scope. - Backends supply complete dependency inventories and interpret the request's original filesystem policy: resolve command temp directories and MXC volumes, and reuse the backend's deny-glob expansion where enforcement expands globs. - The runner prepares dependency facts and invokes each checker per dependency. Checkers remain independent of inventories…
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OpenAIAGENTS.mdopenai/codex/codex-rs/tui/src/bottom_pane/AGENTS.md
When changing the paste-burst or chat-composer state machines in this folder, keep the docs in sync: - Update the relevant module docs (chat_composer.rs and/or paste_burst.rs) so they remain a readable, top-down explanation of the current behavior. - Keep implementations/docstrings aligned unless a divergence is intentional and documented. Practical check: - After edits, sanity-check that docs mention only APIs/behavior that exist in code (especially the Enter/newline paths and disable_paste_burst semantics).
Steady14 mentions in 2 weeks
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An open format for instructions to coding agents, read by Codex, Cursor and others. Think of it as a README written for agents.
At the repository root, with more specific files in subdirectories. Agents read the one closest to the file they're editing.
Setup and test commands, code style, and the rules a new contributor would need to know.
Claude Code reads CLAUDE.md. A one-line CLAUDE.md that points at AGENTS.md covers both.
