Rules — Conditional context

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NOTE

Rules are markdown files loaded only when a glob pattern matches the files in the current turn. They keep CLAUDE.md small by deferring domain-specific guidance until it's relevant.

How it works

• Each rule declares a globs: frontmatter (e.g. "**/*.test.ts").
• The rule body is injected into context only when the LLM touches a matching file.
• Multiple rules can match — they accumulate, so design for additivity.

Related chapters

• Part 4 — Conditional Context (overview)
• Rules Design
• Glob Patterns
• Configuration Reference

Structural problems it addresses

• Context Rot — don't pay for context you don't need.
• Priority Saturation — narrow scope keeps signal high.
• Instruction Decay — re-injected each time a matching file appears.

See also

• Topic: CLAUDE.md — for always-loaded context.
• Topic: Skills & Agents — for context loaded by the LLM's decision rather than by file match.
• Feature Index