Search the Claude Code architecture knowledge base. Returns relevant module analysis at the requested depth level. Use this to understand how specific features, patterns, or subsystems are implemented.

Get detailed content from a specific module. Can optionally return only a specific section type (responsibility, architecture, decisions, principles, or relations).

Read actual Claude Code source code files. Use this to see implementation details referenced in module analysis. Supports line-range extraction. Returns at most 500 lines per call.

List all available architecture modules. Returns module IDs, titles, and key concerns for each module. Use this to discover what knowledge is available before querying specific modules.

Search for reusable design patterns and principles extracted from Claude Code's architecture. Returns 'directly-reusable' patterns that you can adapt for your own Agent implementation. Output is paginated: each section is capped (default 800 chars) and total sections capped (default 12). Use module_id to focus, or get_module(section="principles") for the full text of a specific module.

Trace a specific architectural concern across all modules. Shows how one concept (e.g., 'prompt cache', 'error recovery', 'streaming') is handled at different layers of Claude Code's architecture.