GitNexus/gitnexus/README.md

GitNexus

Graph-powered code intelligence for AI agents. Index any codebase into a knowledge graph, then query it via MCP or CLI.

Works with Cursor, Claude Code, Windsurf, Cline, OpenCode, and any MCP-compatible tool.

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Why?

AI coding tools don't understand your codebase structure. They edit a function without knowing 47 other functions depend on it. GitNexus fixes this by precomputing every dependency, call chain, and relationship into a queryable graph.

Three commands to give your AI agent full codebase awareness.

Quick Start

# Index your repo (run from repo root)
npx gitnexus analyze

That's it. This indexes the codebase, installs agent skills, registers Claude Code hooks, and creates AGENTS.md / CLAUDE.md context files — all in one command.

To configure MCP for your editor, run npx gitnexus setup once — or set it up manually below.

gitnexus setup auto-detects your editors and writes the correct global MCP config. You only need to run it once.

Editor Support

Editor	MCP	Skills	Hooks (auto-augment)	Support
Claude Code	Yes	Yes	Yes (PreToolUse)	Full
Cursor	Yes	Yes	—	MCP + Skills
Windsurf	Yes	—	—	MCP
OpenCode	Yes	Yes	—	MCP + Skills

Claude Code gets the deepest integration: MCP tools + agent skills + PreToolUse hooks that automatically enrich grep/glob/bash calls with knowledge graph context.

Community Integrations

Agent	Install	Source
pi	pi install npm:pi-gitnexus	pi-gitnexus

MCP Setup (manual)

If you prefer to configure manually instead of using gitnexus setup:

Claude Code (full support — MCP + skills + hooks)

claude mcp add gitnexus -- npx -y gitnexus@latest mcp

Cursor / Windsurf

Add to ~/.cursor/mcp.json (global — works for all projects):

{
  "mcpServers": {
    "gitnexus": {
      "command": "npx",
      "args": ["-y", "gitnexus@latest", "mcp"]
    }
  }
}

OpenCode

Add to ~/.config/opencode/config.json:

{
  "mcp": {
    "gitnexus": {
      "command": "npx",
      "args": ["-y", "gitnexus@latest", "mcp"]
    }
  }
}

How It Works

GitNexus builds a complete knowledge graph of your codebase through a multi-phase indexing pipeline:

1. Structure — Walks the file tree and maps folder/file relationships
2. Parsing — Extracts functions, classes, methods, and interfaces using Tree-sitter ASTs
3. Resolution — Resolves imports and function calls across files with language-aware logic
4. Clustering — Groups related symbols into functional communities
5. Processes — Traces execution flows from entry points through call chains
6. Search — Builds hybrid search indexes for fast retrieval

The result is a KuzuDB graph database stored locally in .gitnexus/ with full-text search and semantic embeddings.

MCP Tools

Your AI agent gets these tools automatically:

Tool	What It Does	repo Param
list_repos	Discover all indexed repositories	—
query	Process-grouped hybrid search (BM25 + semantic + RRF)	Optional
context	360-degree symbol view — categorized refs, process participation	Optional
impact	Blast radius analysis with depth grouping and confidence	Optional
detect_changes	Git-diff impact — maps changed lines to affected processes	Optional
rename	Multi-file coordinated rename with graph + text search	Optional
cypher	Raw Cypher graph queries	Optional

With one indexed repo, the repo param is optional. With multiple, specify which: query({query: "auth", repo: "my-app"}).

MCP Resources

Resource	Purpose
gitnexus://repos	List all indexed repositories (read first)
gitnexus://repo/{name}/context	Codebase stats, staleness check, and available tools
gitnexus://repo/{name}/clusters	All functional clusters with cohesion scores
gitnexus://repo/{name}/cluster/{name}	Cluster members and details
gitnexus://repo/{name}/processes	All execution flows
gitnexus://repo/{name}/process/{name}	Full process trace with steps
gitnexus://repo/{name}/schema	Graph schema for Cypher queries

MCP Prompts

Prompt	What It Does
detect_impact	Pre-commit change analysis — scope, affected processes, risk level
generate_map	Architecture documentation from the knowledge graph with mermaid diagrams

CLI Commands

gitnexus setup                    # Configure MCP for your editors (one-time)
gitnexus analyze [path]           # Index a repository (or update stale index)
gitnexus analyze --force          # Force full re-index
gitnexus analyze --embeddings     # Enable embedding generation (slower, better search)
gitnexus analyze --verbose        # Log skipped files when parsers are unavailable
gitnexus mcp                     # Start MCP server (stdio) — serves all indexed repos
gitnexus serve                   # Start local HTTP server (multi-repo) for web UI
gitnexus list                    # List all indexed repositories
gitnexus status                  # Show index status for current repo
gitnexus clean                   # Delete index for current repo
gitnexus clean --all --force     # Delete all indexes
gitnexus wiki [path]             # Generate LLM-powered docs from knowledge graph
gitnexus wiki --model <model>    # Wiki with custom LLM model (default: gpt-4o-mini)

Multi-Repo Support

GitNexus supports indexing multiple repositories. Each gitnexus analyze registers the repo in a global registry (~/.gitnexus/registry.json). The MCP server serves all indexed repos automatically.

Supported Languages

TypeScript, JavaScript, Python, Java, C, C++, C#, Go, Rust, PHP, Kotlin, Swift

Language Feature Matrix

Language	Imports	Types	Exports	Named Bindings	Config	Frameworks	Entry Points	Heritage
TypeScript	✓	✓	✓	✓	✓	✓	✓	✓
JavaScript	✓	✓	✓	✓	✓	✓	✓	✓
Python	✓	✓	✓	✓	✓	✓	✓	✓
C#	✓	✓	✓	✓	✓	✓	✓	✓
Java	✓	✓	✓	✓	—	✓	✓	✓
Kotlin	✓	✓	✓	✓	—	✓	✓	✓
Go	✓	✓	✓	—	✓	✓	✓	✓
Rust	✓	✓	✓	✓	—	✓	✓	✓
PHP	✓	✓	✓	✓	✓	✓	✓	—
Swift	—	✓	✓	—	✓	✓	✓	✓
C	—	✓	✓	—	—	✓	✓	✓
C++	—	✓	✓	—	—	✓	✓	✓

Imports — cross-file import resolution · Types — type annotation extraction · Exports — public/exported symbol detection · Named Bindings — import { X } tracking · Config — language toolchain config parsing (tsconfig, go.mod, etc.) · Frameworks — AST-based framework pattern detection · Entry Points — entry point scoring heuristics · Heritage — class inheritance / interface implementation

Agent Skills

GitNexus ships with skill files that teach AI agents how to use the tools effectively:

• Exploring — Navigate unfamiliar code using the knowledge graph
• Debugging — Trace bugs through call chains
• Impact Analysis — Analyze blast radius before changes
• Refactoring — Plan safe refactors using dependency mapping

Installed automatically by both gitnexus analyze (per-repo) and gitnexus setup (global).

Requirements

• Node.js >= 18
• Git repository (uses git for commit tracking)

Privacy

• All processing happens locally on your machine
• No code is sent to any server
• Index stored in .gitnexus/ inside your repo (gitignored)
• Global registry at ~/.gitnexus/ stores only paths and metadata

Web UI

GitNexus also has a browser-based UI at gitnexus.vercel.app — 100% client-side, your code never leaves the browser.

Local Backend Mode: Run gitnexus serve and open the web UI locally — it auto-detects the server and shows all your indexed repos, with full AI chat support. No need to re-upload or re-index. The agent's tools (Cypher queries, search, code navigation) route through the backend HTTP API automatically.

License

PolyForm Noncommercial 1.0.0

Free for non-commercial use. Contact for commercial licensing.