(Re)index the project to build the code graph. Scans Python, TypeScript, and JavaScript files, extracts definitions, and resolves call/import relationships. Indexing also happens automatically on the first query; use this tool with force=true for a full rebuild, or to see indexing stats and the context-footprint reduction.

Find function, class, or method definitions by name. Returns all matching definitions with their locations and compact signatures - far cheaper than reading files. Optionally filter by language or include call sites.

Find all functions/methods that call a given function, resolved through the call graph (not text search). Useful for impact analysis before changing a function.

Get the contextual neighborhood around a symbol: the symbol plus connected nodes (callers, callees, imports, containers) within a given depth, and the relationships between them. The compact alternative to reading whole files for context.

Expand a symbol's compact signature to its full original source code using token-level source maps. Use this when the signature is not enough and you need the implementation.

DEBUG: Dump the entire graph structure for visualization. Returns the graph in Mermaid diagram, JSON, or Graphviz DOT format. Useful for debugging and understanding the graph structure.