Scan a project directory and build the knowledge graph from code files. Uses tree-sitter AST (with regex fallback) for all code files. Fast, local, no API key needed. Run once per project; rebuild whenever code changes.

Ask a structural question about the codebase OR look up a specific node by name — or both in one call. Pass question for natural-language traversal: what calls X, what does module Y depend on. Pass node for fast single-node lookup: returns type, file, depends_on, used_by. Pass both to get node detail + surrounding graph context together. Returns structured text within token_budget. Use before reading any files.

Return CODEGRAPH_REPORT.md — god nodes, clusters, surprising connections, suggested questions.

List all nodes of a given type in the graph.

Find the shortest relationship path between two concepts in the graph.