io.github.kapillamba4/code-memory MCP Server

code-memory

<!-- mcp-name: io.github.kapillamba4/code-memory --> <img src="assets/logo.png" alt="code-memory logo" width="100%">

A deterministic, high-precision code intelligence layer exposed as a Model Context Protocol (MCP) server.

• Zero telemetry — your code never leaves your machine
• No API key required — runs entirely locally with sentence-transformers
• 1 min setup — just uvx code-memory and you're ready
• Token saving by 50% — precise code retrieval instead of dumping entire files

Please help star code-memory if you like this project!

Why code-memory?

Finding the right context from a large codebase is expensive, inaccurate, and limited by context windows. Dumping files into prompts wastes tokens, and LLMs lose track of the actual task as context fills up.

Instead of manually hunting with grep/find or dumping raw file text, code-memory runs semantic searches against a locally indexed codebase. Inspired by claude-context, but designed from the ground up for large-scale local search.

Supported Languages

Full AST Support (structural parsing with symbol extraction): Python, JavaScript/TypeScript, Java, Go, Rust, C/C++, Ruby, Kotlin

Fallback Support (whole-file indexing): C#, Swift, Scala, Lua, Shell, Config (yaml/toml/json), Web (html/css), SQL, Markdown

Files matching .gitignore patterns are automatically skipped.

Architecture: Progressive Disclosure

Instead of a single monolithic search, code-memory routes queries through three purpose-built tools:

Question Type	Tool	Data Source
"Where / What / How?" — find definitions, references, structure, semantic search	search_code	BM25 + Dense Vector (SQLite vec)
"Architecture / Patterns" — understand architecture, explain workflows	search_docs	Semantic / Fuzzy
"Who / Why?" — debug regressions, understand intent	search_history	Git + BM25 + Dense Vector (SQLite vec)
"Setup / Prepare" — index parsing & embedding generation	index_codebase	AST Parser + sentence-transformers

This forces the LLM to pick the right retrieval strategy before any data is fetched.

Installation

From PyPI (Recommended)

# Install with pip
pip install code-memory

# Or with uvx (for MCP hosts)
uvx code-memory

From Source

# Clone the repo
git clone https://github.com/kapillamba4/code-memory.git
cd code-memory

# Install dependencies
uv sync

# Run the MCP server (stdio transport)
uv run mcp run code_memory/server.py

Pre-built Binaries (Standalone)

Download standalone executables from GitHub Releases — no Python installation required.

Platform	Architecture	File
Linux	x86_64	code-memory-linux-x86_64
macOS	x86_64 (Intel)	code-memory-macos-x86_64
macOS	ARM64 (Apple Silicon)	code-memory-macos-arm64
Windows	x86_64	code-memory-windows-x86_64.exe

# Linux/macOS: Download and make executable
chmod +x code-memory-*
./code-memory-*

# Windows: Run directly
code-memory-windows-x86_64.exe

Note: The first run will download the embedding model (~600MB) to ~/.cache/huggingface/. Subsequent runs use the cached model.

Quickstart

Prerequisites

• Python ≥ 3.13
• uv package manager (recommended) or pip

Install uv if you don't have it:

curl -LsSf https://astral.sh/uv/install.sh | sh

Install & Run

# Install from PyPI
pip install code-memory

# Or run directly with uvx
uvx code-memory

Development

# Run with the MCP Inspector for interactive debugging
uv run mcp dev code_memory/server.py

# Run tests
uv run pytest tests/ -v

# Lint and format
uv run ruff check .
uv run ruff format .

# Build package
uv build

# Build standalone binary (requires pyinstaller)
pip install pyinstaller
pyinstaller --clean code-memory.spec
# Binary output: dist/code-memory

Configure Your MCP Host

You can use either uvx (requires Python) or the standalone binary (no dependencies).

Using uvx (Python required)

Gemini CLI / Gemini Code Assist

Add to your MCP settings (e.g. ~/.gemini/settings.json):

{
  "mcpServers": {
    "code-memory": {
      "command": "uvx",
      "args": ["code-memory"]
    }
  }
}

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{
  "mcpServers": {
    "code-memory": {
      "command": "uvx",
      "args": ["code-memory"]
    }
  }
}

Claude Code (CLI)

Add to .mcp.json in your project root or ~/.mcp.json for global access:

{
  "mcpServers": {
    "code-memory": {
      "command": "uvx",
      "args": ["code-memory"]
    }
  }
}

VS Code (Copilot / Continue)

Add to .vscode/mcp.json in your workspace:

{
  "servers": {
    "code-memory": {
      "command": "uvx",
      "args": ["code-memory"]
    }
  }
}

Using Standalone Binary (No Python required)

Replace the path with the location of your downloaded binary:

{
  "mcpServers": {
    "code-memory": {
      "command": "/path/to/code-memory-linux-x86_64"
    }
  }
}

For Windows:

{
  "mcpServers": {
    "code-memory": {
      "command": "C:\\path\\to\\code-memory-windows-x86_64.exe"
    }
  }
}

Shared SSE Server (Reduce Memory Usage)

By default, each MCP host project launches its own code-memory process, which loads the embedding model (~1–2 GB) once per project. To avoid this, you can run a single shared instance over SSE (Server-Sent Events) and point all your MCP hosts at it.

Start the shared server

# Using uvx (recommended)
uvx code-memory --transport sse

# Custom port and host
uvx code-memory --transport sse --port 8765 --host 127.0.0.1

# Using standalone binary
./code-memory-linux-x86_64 --transport sse

The server listens on http://127.0.0.1:8765/sse by default.

Configure MCP hosts to use the shared server

Instead of launching a new process, point your MCP host at the running SSE endpoint.

Claude Desktop

{
  "mcpServers": {
    "code-memory": {
      "url": "http://127.0.0.1:8765/sse"
    }
  }
}

VS Code (Copilot / Continue)

{
  "servers": {
    "code-memory": {
      "url": "http://127.0.0.1:8765/sse"
    }
  }
}

Claude Code (CLI) — .mcp.json

{
  "mcpServers": {
    "code-memory": {
      "url": "http://127.0.0.1:8765/sse"
    }
  }
}

Tip: Configure uvx code-memory --transport sse to start via a single-instance service manager (e.g. systemd user service, launchd agent, or another one-time login/startup mechanism) so the shared server starts automatically.

Security: The SSE endpoint is unauthenticated. Keep the default --host 127.0.0.1 so only local processes can connect; do not bind to 0.0.0.0 or a public interface unless you've put authentication in front of it.

Configuration

CLI Options

Option	Description	Default
--transport	Transport protocol: stdio or sse	stdio
--port	Port for SSE transport (only when --transport sse is used)	8765
--host	Host/bind address for SSE transport (only when --transport sse is used)	127.0.0.1

Environment Variables

Variable	Description	Default
CODE_MEMORY_LOG_LEVEL	Logging verbosity (DEBUG, INFO, WARNING, ERROR)	INFO
EMBEDDING_MODEL	HuggingFace model ID for embeddings	jinaai/jina-code-embeddings-0.5b

Example:

CODE_MEMORY_LOG_LEVEL=DEBUG uvx code-memory

Custom Embedding Model

You can use a different embedding model by setting the EMBEDDING_MODEL environment variable:

EMBEDDING_MODEL="BAAI/bge-small-en-v1.5" uvx code-memory

For MCP hosts, add the environment variable to your configuration:

{
  "mcpServers": {
    "code-memory": {
      "command": "uvx",
      "args": ["code-memory"],
      "env": {
        "EMBEDDING_MODEL": "BAAI/bge-small-en-v1.5"
      }
    }
  }
}

Note: Changing the embedding model will invalidate existing indexes. You'll need to re-run index_codebase after switching models.

Tools

index_codebase

Indexes or re-indexes source files and documentation in the given directory. Run this before using search_code or search_docs to ensure the database is up to date. Uses tree-sitter for language-agnostic structural extraction and generates dense vector embeddings using sentence-transformers (runs locally, in-process) for semantic search.

index_codebase(directory=".")

search_code

Perform semantic search and find structural code definitions, locate where functions/classes are defined, or map out dependency references (call graphs). Uses hybrid retrieval (BM25 + vector embeddings) to find exact matches and semantic similarities.

search_code(query="parse python files", search_type="definition")
search_code(query="how do we establish the database connection", search_type="references")
search_code(query="src/auth/", search_type="file_structure")

search_docs

Understand the codebase conceptually — how things work, architectural patterns, SOPs. Searches markdown documentation, READMEs, and docstrings extracted from code.

search_docs(query="how does the authentication flow work?")
search_docs(query="installation instructions", top_k=5)

search_history

Debug regressions and understand developer intent through Git history.

search_history(query="fix login timeout", search_type="commits")
search_history(query="src/auth/login.py", search_type="file_history", target_file="src/auth/login.py")
search_history(query="server.py", search_type="blame", target_file="server.py", line_start=1, line_end=20)

Project Structure

code-memory/
├── code_memory/           # Package source
│   ├── server.py          # MCP server entry point (FastMCP)
│   ├── db.py              # SQLite database layer with sqlite-vec
│   ├── parser.py          # Tree-sitter-based code parser
│   ├── doc_parser.py      # Markdown documentation parser
│   ├── queries.py         # Hybrid retrieval query layer
│   ├── git_search.py      # Git history search module
│   ├── errors.py          # Custom exception hierarchy
│   ├── validation.py      # Input validation functions
│   ├── logging_config.py  # Structured logging configuration
│   └── api_types.py       # MCP response TypedDicts
├── tests/                 # Test suite
├── pyproject.toml         # Project metadata & dependencies
└── prompts/               # Milestone prompt engineering files

Troubleshooting

"Git repository not found" error

Make sure you're running search_history from within a git repository. The tool searches upward from the current directory to find .git.

Empty search results

Run index_codebase(directory=".") first to index your code and documentation. The index is stored locally in code_memory.db.

Slow indexing

Indexing generates embeddings using a local sentence-transformers model. The first run downloads the model (~600MB for jina-code-embeddings-0.5b). Subsequent runs are faster.

Embedding model errors

Ensure you have enough disk space and memory. The jina-code-embeddings-0.5b model requires ~1GB RAM when loaded.

Privacy & Security

Your code never leaves your machine. Unlike cloud-based code intelligence tools, code-memory runs entirely locally:

• Zero telemetry — no usage data, analytics, or tracking
• Zero external API calls — all processing happens in-process
• Zero cloud dependencies — works without internet (after initial setup)
• Your data stays local — indexes stored in local SQLite database

This makes code-memory ideal for:

• Proprietary and confidential codebases
• Security-conscious organizations
• Air-gapped development environments
• Privacy-focused developers

See COMPARISON.md for a detailed comparison with cloud-based alternatives.

Air-gapped & Offline Support

code-memory works in completely isolated environments:

Method 1: Pre-built Binary + Cached Model

1. On a connected machine, run code-memory once to cache the embedding model:

   uvx code-memory
   # Model downloads to ~/.cache/huggingface/
   

2. Transfer to air-gapped machine:

   • Standalone binary from GitHub Releases
   • Model cache directory (~/.cache/huggingface/hub/models--*)

3. Run on air-gapped machine — no network required.

Method 2: Offline pip Install

1. Download the wheel from PyPI on a connected machine
2. Transfer and install: pip install code-memory-*.whl
3. Pre-cache the model as above
4. Run offline

Roadmap

• Milestone 1 — Project scaffolding & MCP protocol wiring
• Milestone 2 — Implement search_code with AST parsing + SQLite + sqlite-vec
• Milestone 3 — Implement search_history with Git integration
• Milestone 4 — Implement search_docs with semantic search
• Milestone 5 — Production hardening & packaging

Contributing

See CONTRIBUTING.md for development setup and guidelines.

Changelog

See CHANGELOG.md for version history.

License

MIT