GitNexus is a graph-powered code intelligence platform that indexes any codebase into a knowledge graph, then exposes it through MCP tools and a web UI. It supports 14+ languages with deep scope-based resolution (RFC #909), cross-file type inference, control-flow graphs (CFG), program dependence graphs (PDG), taint analysis, and hybrid search (BM25 + semantic + RRF). The system has two main components: a CLI/MCP server (Node.js) for AI agent integration with tools like Cursor, Claude Code, and Codex; and a web UI (React + Vite) for visual graph exploration. The architecture is a multi-phase ingestion pipeline: scan → structure → parse → scope resolution → clustering → process detection → search indexing. The codebase demonstrates strong engineering with comprehensive test coverage (1100+ tests), a shared types package (gitnexus-shared), vendored tree-sitter grammars with prebuilt binaries, Docker containerization with cosign signing, and CI/CD with security scanning. The eval harness for SWE-bench evaluation shows research-grade rigor. Key architectural decisions include the registry-primary scope resolution system, the language provider pattern with compile-time exhaustive dispatch, and the worker pool for parallel parsing with self-healing capabilities.