OpenAI Codex — AGENTS.mdガイド

CodexがAGENTS.mdを読み込む仕組み。3階層の優先度（グローバル→プロジェクト→オーバーライド）、32KB制限。

codex openai agents-md discovery hierarchy

AGENTS.md · 37 lines

# OpenAI Codex — AGENTS.md Guide

## Discovery Hierarchy (Three-Tier Precedence)

1. **Global scope**: `~/.codex/AGENTS.override.md` or `~/.codex/AGENTS.md`
2. **Project scope**: Files walking from Git root to current directory
3. **Merge order**: Files concatenate from root downward; closer files override earlier ones

Stops at `project_doc_max_bytes` (32 KiB default). Skips empty files.

## Recommended Structure

### Global File (`~/.codex/AGENTS.md`)
- Standard testing commands
- Package manager preferences
- Dependency management policies
- Code quality standards

### Project-Level File (`AGENTS.md` in repo root)
- Linting requirements
- Documentation standards
- PR submission workflows

### Nested Overrides (`AGENTS.override.md`)
- Service-specific processes
- Security constraints
- Team-level modifications

## Configuration (`~/.codex/config.toml`)
- `project_doc_fallback_filenames`: Alternative names (e.g., `TEAM_GUIDE.md`)
- `project_doc_max_bytes`: Instruction size limit
- `CODEX_HOME`: Environment variable for alternate profile directories

## Verification
```bash
codex --ask-for-approval never "Summarize current instructions"
```

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