octocode

Structural Code Intelligence for AI Agents — MCP Server + Knowledge Graph + Semantic Search

![GitHub stars](https://github.com/Muvon/octocode/stargazers) ![License](https://opensource.org/licenses/Apache-2.0) ![Rust](https://www.rust-lang.org) ![Release](https://github.com/Muvon/octocode/releases)

Give your AI assistant a brain for your codebase. Octocode transforms your project into a navigable knowledge graph that Claude, Cursor, and other AI agents can search, understand, and navigate.

🚀 Quick Start • 🤖 MCP Integration • 📖 Documentation • 🌐 Website

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🤖 Built for AI Agents

The Problem: AI assistants are blind to your codebase. They can't search your files, understand dependencies, or remember context across sessions.

The Solution: Octocode's MCP server gives AI agents:

🔍 Semantic search — Find code by meaning, not keywords
🕸️ Knowledge graph — Navigate imports, calls, and dependencies
📝 Code signatures — View structure without reading entire files
🧠 Persistent memory — Remember decisions across conversations

Works with: Claude Desktop • Cursor • Windsurf • Any MCP-compatible AI

// Add to your AI assistant config
{
  "mcpServers": {
    "octocode": {
      "command": "octocode",
      "args": ["mcp", "--path", "/your/project"]
    }
  }
}

Now your AI assistant can: ``` You: "Where is authentication handled?" AI: searches your codebase "Authentication is in src/middleware/auth.rs, which imports jwt.rs for token validation and calls user_store.rs for lookup."

You: "What files depend on the payment module?" AI: queries knowledge graph "src/api/handlers/payment.rs imports payment/mod.rs, which is also used by src/workers/refund.rs and src/cron/billing.rs"

You: "Remember this bug fix for future reference" AI: stores in memory "Got it. I'll remember this authentication bypass fix and apply similar patterns when reviewing security code." ```

🤔 Why Octocode?

Standard RAG treats your code as flat text chunks. It finds similar-sounding snippets but has no idea that auth_middleware.rs imports jwt.rs, calls user_store.rs, and is wired into router.rs. Octocode understands structure.

# Semantic search finds the right code
octocode search "authentication middleware"
→ src/middleware/auth.rs | Similarity 0.923

# GraphRAG reveals the full dependency chain
octocode graphrag get-relationships --node_id src/middleware/auth.rs
Outgoing:
  imports → jwt (src/auth/jwt.rs): token validation logic
  calls   → user_store (src/db/user_store.rs): user lookup by token
Incoming:
  imports ← router (src/router.rs): wires auth into the request pipeline

Octocode uses tree-sitter AST parsing to extract real symbols (functions, imports, dependencies), builds a GraphRAG knowledge graph of relationships between files, and exposes everything via MCP — so AI tools can navigate your project architecture, not just search it.

🔬 How It Works

Source Code → Tree-sitter AST → Symbols & Relationships → Knowledge Graph
                                        ↓
                    Embeddings + Hybrid Search + Reranking → MCP Server

AST Parsing — tree-sitter extracts real code symbols (functions, classes, imports), not arbitrary text chunks
Knowledge Graph — GraphRAG maps relationships between files: imports, calls, implements, extends, configures, and 9 more types — each with importance weighting
Hybrid Search — semantic similarity + BM25 full-text search + reranking — not just vector embeddings
MCP Server — exposes semantic_search, view_signatures, and graphrag tools to any MCP-compatible client

✨ What Makes It Different

| | Standard RAG | Doc Lookup Tools | Octocode | |---|---|---|---| | Indexes | Text chunks | External library docs | Your codebase structure (AST) | | Understands | Similar text | API specs & usage | Functions, imports, dependencies | | Cross-file | No | No | Yes — navigates the dependency graph | | Relationships | No | No | imports, calls, implements, extends... | | AI integration | Varies | MCP | Native MCP server + LSP |

Doc tools give AI the manual for libraries you use. Octocode gives AI the blueprint of how you put them together.

Built with Rust for performance. Local-first for privacy. Open source (Apache 2.0) for transparency.

🚀 Quick Start

1. Install

# Universal installer (Linux, macOS, Windows)
curl -fsSL https://raw.githubusercontent.com/Muvon/octocode/master/install.sh | sh

# macOS with Homebrew
brew install muvon/tap/octocode

<details> <summary><strong>Other installation methods</strong></summary>

# Cargo (build from source)
cargo install --git https://github.com/Muvon/octocode

# Download binary from releases
# https://github.com/Muvon/octocode/releases

See Installation Guide for platform-specific instructions. </details>

2. Set Up API Keys

# Required: Embedding provider (Voyage AI has 200M free tokens/month)
export VOYAGE_API_KEY="your-voyage-api-key"

# Optional: LLM for commit messages, code review
export OPENROUTER_API_KEY="your-openrouter-api-key"

Get your Voyage API key: voyageai.com (free tier available)

<details> <summary><strong>Other embedding providers</strong></summary>

Octocode supports multiple embedding providers:

# OpenAI
export OPENAI_API_KEY="your-key"
octocode config --code-embedding-model "openai:text-embedding-3-small"

# Jina AI
export JINA_API_KEY="your-key"
octocode config --code-embedding-model "jina:jina-embeddings-v3"

# Google
export GOOGLE_API_KEY="your-key"
octocode config --code-embedding-model "google:text-embedding-005"

See API Keys guide for all supported providers. </details>

3. Index Your Codebase

cd /your/project
octocode index
# → Indexed 12,847 blocks across 342 files

4. Search Your Code

# Natural language search
octocode search "authentication middleware"

# Multi-query for broader results
octocode search "auth" "middleware" "session"

# Filter by language
octocode search "database connection pool" --lang rust

# Search commit history
octocode search "authentication refactor" --mode commits

5. Connect Your AI Assistant

Add to your MCP client config (Claude Desktop, Cursor, Windsurf):

{
  "mcpServers": {
    "octocode": {
      "command": "octocode",
      "args": ["mcp", "--path", "/your/project"]
    }
  }
}

Done! Your AI assistant now understands your codebase structure.

🔌 MCP Server Integration

Octocode includes a built-in MCP server that exposes your codebase as tools to AI assistants. This is the primary way to use Octocode — give your AI assistant direct access to search and navigate your code.

Available Tools

| Tool | What It Does | |------|--------------| | semantic_search | Find code by meaning — "authentication flow", "error handling", "database queries" | | view_signatures | View file structure — function signatures, class definitions, imports | | graphrag | Query relationships — "what calls this function?", "what does this module import?" | | structural_search | AST pattern matching — find .unwrap() calls, new instantiations, specific patterns |

Conversational AI Examples

Once connected, your AI assistant can answer questions about your codebase:

You: "Where is user authentication implemented?"
AI: *uses semantic_search* "Found in src/auth/login.rs. The authenticate() function
    validates credentials against the database, generates a JWT token, and stores
    the session in Redis."

You: "What files depend on the payment module?"
AI: *uses graphrag* "src/api/handlers/payment.rs imports payment/mod.rs, which is also
    used by src/workers/refund.rs and src/cron/billing.rs. The payment module exports
    process_payment() and validate_transaction() functions."

You: "Show me all error handling in the API layer"
AI: *uses structural_search* "Found 23 error handling patterns in src/api/:
    - 15 use Result<T, ApiError> with explicit error types
    - 8 use .unwrap() (potential panics in handlers/user.rs:42, handlers/auth.rs:87)
    - 3 use .expect() with custom messages"

Quick Setup

Octomind (Recommended) — Zero setup, Octocode pre-configured: ``bash curl -fsSL https://raw.githubusercontent.com/muvon/octomind/master/install.sh | bash octomind run developer:rust ``

Claude Code (CLI) — Command-line setup: ``bash claude mcp add octocode -- octocode mcp --path /path/to/your/project ``

Claude Desktop / Cursor / Windsurf — Add to config: ``json { "mcpServers": { "octocode": { "command": "octocode", "args": ["mcp", "--path", "/path/to/your/project"] } } } ``

Config locations:

Claude Desktop: ~/Library/Application Support/Claude/claude_desktop_config.json (macOS)
Cursor: ~/.cursor/mcp.json or Settings → MCP Servers
Windsurf: Settings → MCP

📖 Complete MCP Client Setup Guide — Detailed instructions for 15+ clients including VS Code (Cline/Continue), Zed, Replit, and more.

🎯 What Can You Do With It?

New developer onboarding: `` You: "How does the authentication system work?" AI: searches and navigates "Authentication starts in src/middleware/auth.rs which validates JWT tokens. It calls src/auth/jwt.rs for token verification, which uses the public key from config. Failed auth returns 401 via src/errors/auth_error.rs. Sessions are stored in Redis via src/cache/session.rs." ``

Code archaeology: ``` You: "Find all places we handle database errors" AI: structural search "Found 47 error handling patterns:

32 use Result<T, DbError> with proper error types
15 use .unwrap() (potential issues in src/db/user.rs:23, src/db/order.rs:156)
Recommend adding proper error handling to those locations"


**Refactoring with confidence:**

You: "What depends on the PaymentProcessor trait?" AI: queries graph "src/api/handlers/checkout.rs, src/workers/refund_worker.rs, and src/cron/billing.rs all depend on PaymentProcessor. The trait is defined in src/domain/payment.rs and implemented by src/infrastructure/stripe.rs and src/infrastructure/paypal.rs." ```

Code review assistance: `` You: "Review this PR for security issues" AI: analyzes changes "The PR adds password hashing in src/auth/hash.rs. However, it uses SHA256 which is fast and vulnerable to brute force. Recommend using bcrypt or argon2 instead. Also found 3 instances of .unwrap() that could panic in production." ``

🌐 Supported Languages

| Language | Extensions | Features | |----------|------------|----------| | Rust | .rs | Full AST parsing, pub/use detection, module structure | | Python | .py | Import/class/function extraction, docstring parsing | | TypeScript/JavaScript | .ts, .tsx, .js, .jsx | ES6 imports/exports, type definitions | | Go | .go | Package/import analysis, struct/interface parsing | | PHP | .php | Class/function extraction, namespace support | | C++ | .cpp, .cc, .cxx, .c++, .c, .h, .hpp, .hxx, .cppm, .ixx, .mxx, .ccm, .cxxm | Include analysis, class/function extraction, C++20 module support | | Ruby | .rb | Class/module extraction, method definitions | | Java | .java | Import analysis, class/method extraction | | JSON | .json | Structure analysis, key extraction | | Bash | .sh, .bash | Function and variable extraction | | Markdown | .md | Document section indexing, header extraction |

Plus: CSS, Lua, Svelte, and more via tree-sitter

📚 Documentation

Getting Started — First steps and basic workflow
Installation Guide — Detailed methods and building from source
MCP Client Setup — Connect to Claude, Cursor, Windsurf, and 15+ clients
MCP Integration — MCP server details and advanced configuration
Commands Reference — Complete CLI reference
Configuration — Templates and customization
API Keys — Provider setup guide
Architecture — How it works under the hood
Contributing — Development setup

🔒 Privacy & Security

🏠 Local-first — local embedding models available on supported platforms (macOS ARM default builds); cloud providers on all platforms
🔐 Secure — API keys stored locally, env vars supported
🚫 Respects .gitignore — Never indexes sensitive files
🛡️ MCP security — Local-only server, no external network for search
📤 Cloud-safe — Embeddings process only metadata, never source code

<details> <summary><strong>📊 Retrieval Quality Benchmark</strong></summary>

We measure semantic search quality using a hand-annotated ground truth dataset of 254 queries (127 code + 127 docs) with precise line-range annotations. Each query has 1–3 expected results scored by relevance.

Tested on commit b1771ba with benchmark config (contextual retrieval, Voyage reranker, RaBitQ quantization).

<details> <summary><strong>Documentation search</strong> (<code>--mode docs</code>) — Hit@10: 0.953, MRR: 0.776</summary>

| Metric | Score | |--------|-------| | Hit@5 | 0.929 (118/127) | | Hit@10 | 0.953 (121/127) | | MRR | 0.776 | | NDCG@10 | 0.801 | | Recall@5 | 0.902 | | Recall@10 | 0.921 |

Missed queries (6 of 127):

| # | Query | Expected | Got (top 1) | |---|-------|----------|-------------| | 43 | how to set up MCP proxy for managing multiple repositories | doc/MCP_INTEGRATION.md:286-311 | doc/MCP_INTEGRATION.md:286-4 | | 51 | what are the prerequisites before using octocode | doc/GETTING_STARTED.md:6-12 | doc/CONTRIBUTING.md:7-33 | | 59 | what to do when hitting API rate limits | doc/GETTING_STARTED.md:209-216 | doc/PERFORMANCE.md:304-356 | | 75 | typical performance metrics for small medium and large projects | doc/PERFORMANCE.md:4-13 | doc/PERFORMANCE.md:414-14 | | 112 | how to install octocode on different operating systems | INSTALL.md:4-14 | INSTALL.md:49-70 | | 115 | how to fix macOS Gatekeeper blocking the binary | INSTALL.md:199-206 | INSTALL.md:198-119 |

</details>

<details> <summary><strong>Code search</strong> (<code>--mode code</code>) — Hit@10: 0.992, MRR: 0.895</summary>

| Metric | Score | |--------|-------| | Hit@5 | 0.992 (126/127) | | Hit@10 | 0.992 (126/127) | | MRR | 0.895 | | NDCG@10 | 0.906 | | Recall@5 | 0.962 | | Recall@10 | 0.974 |

Missed queries (1 of 127):

| # | Query | Expected | Got (top 1) | |---|-------|----------|-------------| | 105 | how does the system ensure two developers get the same database path | src/storage.rs:60-83 | src/mcp/proxy.rs:631-644 |

</details>

Metrics: Hit@k (did the answer appear?), MRR (how high?), NDCG@10 (are best results ranked first?), Recall@k (how many found?). See benchmark/ for methodology, scoring script, and the full dataset.

</details>

🤝 Community & Support

⭐ Star us on GitHub — It really helps!
🐛 Report Issues
💬 Discussions
📧 opensource@muvon.io
🌐 muvon.io

⚖️ License

Apache License 2.0 — See LICENSE for details.

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Built with 🦀 Rust by Muvon in Hong Kong

⭐ Star • 🍴 Fork • 📣 Share

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Structural Code Intelligence for AI Agents — MCP Server + Knowledge Graph + Semantic Search

🤖 Built for AI Agents

🤔 Why Octocode?

🔬 How It Works

✨ What Makes It Different

🚀 Quick Start

1. Install

2. Set Up API Keys

3. Index Your Codebase

4. Search Your Code

5. Connect Your AI Assistant

🔌 MCP Server Integration

Available Tools

Conversational AI Examples

Quick Setup

🎯 What Can You Do With It?

🌐 Supported Languages

📚 Documentation

🔒 Privacy & Security

🤝 Community & Support

⚖️ License

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