Memory-powered AI agent framework with MCP integration

Byterover Cipher is an opensource memory layer specifically designed for coding agents. Compatible with Cursor, Codex, Claude Code, Windsurf, Cline, Claude Desktop, Gemini CLI, AWS's Kiro, VS Code, Roo Code, Trae, Amp Code and Warp through MCP, and coding agents, such as Kimi K2. (see more on examples)

Built by Byterover team

Key Features:

• 🔌 MCP integration with any IDE you want.
• 🧠 Auto-generate AI coding memories that scale with your codebase.
• 🔄 Switch seamlessly between IDEs without losing memory and context.
• 🤝 Easily share coding memories across your dev team in real time.
• 🧬 Dual Memory Layer that captures System 1 (Programming Concepts & Business Logic & Past Interaction) and System 2 (reasoning steps of the model when generating code).
• ⚙️ Install on your IDE with zero configuration needed.

# Install globally
npm install -g @byterover/cipher

# Or install locally in your project
npm install @byterover/cipher

# Clone and setup
git clone https://github.com/campfirein/cipher.git
cd cipher

# Configure environment
cp .env.example .env
# Edit .env with your API keys

# Start with Docker
docker-compose up --build -d

# Test
curl http://localhost:3000/health

pnpm i && pnpm run build && npm link

# Interactive mode
cipher

# One-shot command
cipher "Add this to memory as common causes of 'CORS error' in local dev with Vite + Express."

# API server mode
cipher --mode api

# MCP server mode
cipher --mode mcp

# Web UI mode
cipher --mode ui

The Cipher Web UI provides an intuitive interface for interacting with memory-powered AI agents, featuring session management, tool integration, and real-time chat capabilities.

Cipher supports multiple configuration options for different deployment scenarios. The main configuration file is located at memAgent/cipher.yml.

# LLM Configuration
llm:
  provider: openai # openai, anthropic, openrouter, ollama, qwen
  model: gpt-4-turbo
  apiKey: $OPENAI_API_KEY

# System Prompt
systemPrompt: 'You are a helpful AI assistant with memory capabilities.'

# MCP Servers (optional)
mcpServers:
  filesystem:
    type: stdio
    command: npx
    args: ['-y', '@modelcontextprotocol/server-filesystem', '.']

📖 See Configuration Guide for complete details.

Create a .env file in your project root with these essential variables:

# ====================
# API Keys (At least one required)
# ====================
OPENAI_API_KEY=sk-your-openai-api-key
ANTHROPIC_API_KEY=sk-ant-your-anthropic-key
GEMINI_API_KEY=your-gemini-api-key
QWEN_API_KEY=your-qwen-api-key

# ====================
# Vector Store (Optional - defaults to in-memory)
# ====================
VECTOR_STORE_TYPE=qdrant  # qdrant, milvus, or in-memory
VECTOR_STORE_URL=https://your-cluster.qdrant.io
VECTOR_STORE_API_KEY=your-qdrant-api-key

# ====================
# Chat History (Optional - defaults to SQLite)
# ====================
CIPHER_PG_URL=postgresql://user:pass@localhost:5432/cipher_db

# ====================
# Workspace Memory (Optional)
# ====================
USE_WORKSPACE_MEMORY=true
WORKSPACE_VECTOR_STORE_COLLECTION=workspace_memory

# ====================
# AWS Bedrock (Optional)
# ====================
AWS_ACCESS_KEY_ID=your-aws-access-key
AWS_SECRET_ACCESS_KEY=your-aws-secret-key
AWS_DEFAULT_REGION=us-east-1

# ====================
# Advanced Options (Optional)
# ====================
# Logging and debugging
CIPHER_LOG_LEVEL=info  # error, warn, info, debug, silly
REDACT_SECRETS=true

# Vector store configuration
VECTOR_STORE_DIMENSION=1536
VECTOR_STORE_DISTANCE=Cosine  # Cosine, Euclidean, Dot, Manhattan
VECTOR_STORE_MAX_VECTORS=10000

# Memory search configuration
SEARCH_MEMORY_TYPE=knowledge  # knowledge, reflection, both (default: knowledge)
DISABLE_REFLECTION_MEMORY=true  # default: true

Cipher can run as an MCP (Model Context Protocol) server, allowing integration with MCP-compatible clients like Codex, Claude Desktop, Cursor, Windsurf, and other AI coding assistants.

To install cipher for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @campfirein/cipher --client claude

To use Cipher as an MCP server in your MCP client configuration:

{
	"mcpServers": {
		"cipher": {
			"type": "stdio",
			"command": "cipher",
			"args": ["--mode", "mcp"],
			"env": {
				"MCP_SERVER_MODE": "aggregator",
				"OPENAI_API_KEY": "your_openai_api_key",
				"ANTHROPIC_API_KEY": "your_anthropic_api_key"
			}
		}
	}
}

📖 See MCP Integration Guide for complete MCP setup and advanced features.

👉 Built‑in tools overview — expand the dropdown below to scan everything at a glance. For full details, see docs/builtin-tools.md 📘.

Watch our comprehensive tutorial on how to integrate Cipher with Claude Code through MCP for enhanced coding assistance with persistent memory:

Click the image above to watch the tutorial on YouTube.

For detailed configuration instructions, see the CLI Coding Agents guide.

For detailed documentation, visit:

• Quick Start Guide
• Configuration Guide
• Complete Documentation

We welcome contributions! Refer to our Contributing Guide for more details.

cipher is the opensource version of the agentic memory of byterover which is built and maintained by the byterover team.

• Join our Discord to share projects, ask questions, or just say hi!
• If you enjoy cipher, please give us a ⭐ on GitHub—it helps a lot!
• Follow @kevinnguyendn on X

Thanks to all these amazing people for contributing to cipher!

Elastic License 2.0. See LICENSE for full terms.