Use when creating or fixing .claude/rules/ files - provides correct paths frontmatter (not globs), glob patterns, and avoids Cursor-specific fields like alwaysApply
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See how to installReview the instructions the agent will receive before you install.
Rules in .claude/rules/ are modular instructions scoped to specific files via glob patterns. They load automatically with same priority as CLAUDE.md.
.claude/rules/globs instead of paths)| Field | Claude | Cursor |
|---|---|---|
| Path patterns | paths | globs |
| Always apply | Omit paths | alwaysApply: true |
| Description | Not documented | description |
---
paths:
- 'src/api/**/*.ts'
- 'tests/**/*.test.ts'
---
Or single pattern:
---
paths: src/**/*.{ts,tsx}
---
Omit frontmatter entirely - applies to all files:
# TypeScript Conventions
Use .js extensions in imports.
# ❌ WRONG - globs is Cursor format
---
globs:
- '**/*.ts'
---
# ✅ CORRECT - Claude uses paths
---
paths:
- '**/*.ts'
---
# ❌ WRONG - alwaysApply is Cursor-only
---
alwaysApply: true
---
# ✅ CORRECT - just omit paths for global rules
# (no frontmatter needed)
# ❌ WRONG - unquoted patterns
---
paths:
- **/*.ts
---
# ✅ CORRECT - quote glob patterns
---
paths:
- "**/*.ts"
---
.claude/rules/
├── testing.md # Path-scoped or global
├── typescript.md
└── frontend/ # Subdirectories supported
└── react.md
Files discovered recursively. Use subdirectories to organize.
| Pattern | Matches |
|---|---|
**/*.ts | All .ts files anywhere |
src/**/* | Everything under src/ |
*.md | Markdown in root only |
**/*.{ts,tsx} | .ts and .tsx files |
{src,lib}/**/*.ts | .ts in src/ or lib/ |
https://code.claude.com/docs/en/memory#modular-rules-with-claude/rules/
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Use when you need Codex to coordinate multiple agents through Agent Relay for peer-to-peer messaging, lead/worker handoffs, or shared status tracking across sub-agents and terminals.
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Use when testing web applications with visual verification - automates Chrome browser interactions, element selection, and screenshot capture for confirming UI functionality
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Use when creating or improving Claude Code agents. Expert guidance on agent file structure, frontmatter, persona definition, tool access, model selection, and validation against schema.
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Use when creating or publishing Claude Code hooks - covers executable format, event types, JSON I/O, exit codes, security requirements, and PRPM package structure
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