code-nexus 0.2.0

Transform your codebase into a structured semantic knowledge graph for AI agents and developers.

code-nexus

Transform your codebase into a structured semantic knowledge graph for AI agents and developers.

code-nexus is a local-first, open-source engine that parses your repository into a queryable knowledge graph with rich temporal context from Git history. It provides:

• For AI Agents: A Model Context Protocol (MCP) server that enables Claude Code and other AI tools to query your codebase structurally instead of via text search—reducing token usage by up to 80% on architectural queries.
• For Developers: An interactive, time-traveling visual map of your code that helps you understand blast radius, code ownership, and architectural dependencies.

Features

✨ AST-Powered Code Understanding

• Parses Python, TypeScript/JavaScript, and Rust with tree-sitter
• Extracts files, classes, functions, and module-level symbols
• Identifies imports, function calls, and inheritance relationships

🔍 AI Agent-First Design

• MCP-compliant query tools: search_nodes, get_node_signature, get_downstream_dependencies, get_upstream_callers, get_blast_radius_report
• Context pruning engine: automatically filters non-essential code to minimize token usage
• Agent session persistence: track inspection history across restarts
• Temporal MCP tools: get_node_history, get_graph_at_commit

⏱️ Git-Integrated Temporal Context

• Commit history overlay: tracks churn, ownership, and last-modified metadata per node
• Time-travel slider: visualize how your architecture evolved
• Diff-patch snapshots: efficiently replay historical graph states

📊 Interactive Visualization

• WebGL 3D graph rendering of up to 10,000 nodes at 60 FPS
• Blast radius highlighting: click a node to see everything that depends on it
• Analytical overlays: complexity heatmaps, churn scoring, ownership visualization

🔌 Plugin System

• Extend the graph with custom metadata via Python plugins
• Hook into node creation and graph-ready events
• Drop plugins into plugins/ directory—no configuration needed

⚡ Zero External Dependencies

• Local SQLite storage (graph lives in .codenexus/graph.db)
• No network calls, no cloud services
• Single command to start: code-nexus start .

Quick Start

Installation

pip install code-nexus

Or use Docker:

docker run -v $(pwd):/repo code-nexus:latest code-nexus start /repo

Usage

For Developers (Interactive UI):

cd your-repo
code-nexus start .

Opens http://localhost:7842 in your browser.

For AI Agents (MCP Server):

cd your-repo
code-nexus mcp .

Configure your MCP client (e.g., Claude Code):

{
  "mcpServers": {
    "code-nexus": {
      "command": "code-nexus",
      "args": ["mcp", "."]
    }
  }
}

Sync with Latest Commits:

code-nexus sync .

Re-runs the git overlay on an existing graph to pick up new commits without a full re-index.

Tech Stack

Layer	Technology	Why
Parsing	tree-sitter + Python	Industry-standard AST extraction, 70+ grammar support
Graph Engine	rustworkx (in-memory)	3–100x faster than NetworkX for large graphs
Persistence	SQLite (WAL mode)	Zero external dependencies, portable, concurrent reads
Agent Protocol	MCP (Model Context Protocol)	Standard for AI agent tooling
Frontend	React + react-force-graph-3d	WebGL rendering for massive graphs
API	FastAPI + Uvicorn	Lightweight, production-ready

Architecture

See ARCHITECTURE.md for detailed system design, database schema, MCP tool specifications, and performance targets.

At a glance:

code-nexus start .
    ├─ Ingestion Engine (parallel AST parsing)
    │   └─ Outputs: rustworkx graph + SQLite persistence
    ├─ FastAPI Server
    │   ├─ MCP Server (stdio + HTTP/SSE)
    │   └─ REST/WebSocket API for UI
    ├─ React Frontend (3D graph visualization)
    └─ File Watcher (incremental updates)

Performance Targets

Metric	Target	Conditions
100k LOC ingestion	< 30s	M1 Mac, 4 workers, SSD
500k LOC ingestion	< 60s	M1 Mac, 4 workers, SSD
Incremental update	< 2s	Single file changed
MCP structural query	< 100ms	Graph in memory
Context pruning	< 500ms	Graph in memory
UI rendering	60 FPS	10,000 nodes, WebGL
Token reduction	> 80%	vs full-file injection

Available MCP Tools (Phase 1)

Tool	Purpose
search_nodes(query, type?, language?)	Fuzzy search for nodes by name
get_node_signature(node_id)	Retrieve node metadata and location
get_downstream_dependencies(node_id, depth?)	Find all nodes that depend on this node
get_upstream_callers(node_id, depth?)	Find all nodes that this node depends on
get_node_history(node_id, limit?)	Get commit history for a node (Phase 2)
get_agent_session_history(session_id)	Retrieve prior agent actions in this session
record_agent_action(session_id, node_id, action)	Log agent inspection/modification for persistence

Roadmap

Phase 1 (Alpha) — Core MCP Engine & UI

• ✅ AST parsing (Python, TypeScript, Rust)
• ✅ Parallel ingestion pipeline
• ✅ SQLite persistence
• ✅ 3D WebGL Graph UI with Blast Radius & Overlays
• ✅ MCP server (stdio transport)

Phase 2 (Beta) — Temporal Intelligence

• ✅ Git overlay with diff-patch snapshots
• ✅ Context pruning engine
• ✅ Time-travel slider
• ✅ Blast radius risk scoring
• ✅ get_node_history & get_graph_at_commit MCP tools

Phase 3 (v1.0) — Ecosystem

• 🔲 Plugin system launch
• 🔲 VS Code / JetBrains extensions
• 🔲 Cursor contextProvider adapter
• 🔲 GitHub Actions blast-radius reports
• 🔲 Anonymous telemetry (opt-in)

Phase 4+ (Beyond)

• WASM plugin sandboxing
• Cross-repository dependency mapping
• GitHub/GitLab API enrichment

Contributing

See CONTRIBUTING.md for:

• Language parser development guide
• Plugin authoring guide
• Development setup
• Testing framework

Privacy & Security

✅ 100% local processing. No code, paths, or symbols leave your machine.

✅ Zero external dependencies. Graph storage is a single SQLite file inside your repo (.codenexus/).

⚠️ Plugins are not sandboxed in Phase 1–3. They run with the same OS permissions as code-nexus. WASM sandboxing is a Phase 4 goal. Only load plugins you trust.

License

MIT License © 2026 Sneh Nagrecha

See LICENSE for details.

Support

• 📖 Architecture Guide
• 📋 Product Requirements
• 💬 GitHub Issues
• 🐳 Docker: docker run -v $(pwd):/repo code-nexus:latest

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