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AGENTS.md examples from real projects

How real projects brief Codex, Cursor and every other agent that reads AGENTS.md.

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JetBrainsAGENTS.md

kotlin

JetBrains/kotlin/AGENTS.md

CRITICAL: guidelines.md MUST be followed at all times.

No other project uses it yet

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JetBrainsAGENTS.md

kotlin / analysis

JetBrains/kotlin/analysis/AGENTS.md

A library for analyzing Kotlin code at the semantic level, providing structured access to symbols, types, and semantic relationships. Entry point: Use analyze() to start an analysis session. See Analysis…

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JetBrainsAGENTS.md

kotlin / compiler

JetBrains/kotlin/compiler/AGENTS.md

Consider reading fir-basics.md. FIR processes code through sequential phases (see FirResolvePhase.kt). Key invariant: In phase B following phase A, all FIR elements visible in B are resolved to phase A.

No other project uses it yet

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JetBrainsAGENTS.md

intellij-community

JetBrains/intellij-community/AGENTS.md

Write every user-visible artifact in ASD-STE100 Simplified Technical English, and keep it short. This covers a comment, KDoc, a commit message, documentation, a spec, and a report to the user.…

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JetBrainsAGENTS.md

intellij-community / java

JetBrains/intellij-community/java/AGENTS.md

Rules for this directory and every directory below it. They override the root AGENTS.md. More intellij.java.* modules live outside this tree, under ../plugins/ and ../platform/. This file does not reach…

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JetBrainsAGENTS.md

intellij-community / python

JetBrains/intellij-community/python/AGENTS.md

Start a PY-NNNNN issue or Python support work at .ai/index.md.

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CLAUDE.md vs AGENTS.md

About AGENTS.md

What is AGENTS.md?

An open format for instructions to coding agents, read by Codex, Cursor and others. Think of it as a README written for agents.

Where does it go?

At the repository root, with more specific files in subdirectories. Agents read the one closest to the file they're editing.

What should it contain?

Setup and test commands, code style, and the rules a new contributor would need to know.

Does Claude Code read it?

Claude Code reads CLAUDE.md. A one-line CLAUDE.md that points at AGENTS.md covers both.