Juice
A tiny taste layer for AI agents
What is Juice?
Juice is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to tiny taste layer for ai agents
A tiny taste layer for AI agents
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- A tiny taste layer for AI agents
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx juiceConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Juice
Juice is a lightweight MCP server that acts as a 'taste layer' for AI agents — a thin, SQLite-backed persistence layer that lets agents store, retrieve, and compose reusable skills and short-term context snippets. Built in TypeScript and designed to be minimal, it focuses on giving agents a structured way to accumulate learned behaviors and preferences across sessions without the overhead of a full vector database or external memory service. Developers building custom AI agent workflows use Juice to add lightweight state and skill memory to their MCP-connected agents, enabling them to improve behavior over time.
Prerequisites
- Node.js 18 or later installed
- npx available (ships with npm 5.2+)
- An MCP-compatible client such as Claude Desktop
- SQLite3 available on the system (usually pre-installed on macOS and Linux)
- Write access to a directory where the SQLite database file will be stored
Clone the Juice repository
Since Juice is not yet published to npm, clone the source repository and build it locally.
git clone https://github.com/alvinunreal/juice
cd juice
npm installBuild the TypeScript project
Compile the TypeScript sources to JavaScript. The output will be placed in the dist directory.
npm run buildVerify the build succeeded
Confirm the compiled entry point exists before configuring your MCP client.
ls dist/index.jsAdd Juice to your MCP client configuration
Open claude_desktop_config.json and add an entry that launches Juice as a subprocess using the compiled entry point. Adjust the path to match where you cloned the repository.
{
"mcpServers": {
"juice": {
"command": "node",
"args": ["/absolute/path/to/juice/dist/index.js"]
}
}
}Restart Claude Desktop and test the connection
After restarting, the Juice tools for storing and retrieving agent skills and context should appear. Ask Claude to list available tools to confirm the server connected successfully.
Juice Examples
Client configuration
Claude Desktop configuration for the Juice MCP Server, launching the locally built Node.js binary.
{
"mcpServers": {
"juice": {
"command": "node",
"args": ["/Users/you/projects/juice/dist/index.js"]
}
}
}Prompts to try
Example prompts for using Juice's agent skill and context persistence capabilities.
- "Save the skill 'format_sql' with a description of how to properly format SQL queries for our style guide."
- "Retrieve all stored skills related to data formatting."
- "Remember this user preference: always use British English spelling in responses."
- "List all the agent skills currently stored in Juice."
- "Delete the outdated skill 'old_api_pattern' from the skill store."Troubleshooting Juice
SQLite error on startup: cannot open database file
Juice needs write access to its database directory. Verify the process has permission to write to the directory where the SQLite file is created. You may need to specify a different database path via an environment variable or config option in the source.
npm run build fails with TypeScript errors
Ensure you are running Node.js 18 or later and that all dependencies installed cleanly. Run npm install again to verify, then npm run build. Check the tsconfig.json target setting if you see downlevel emission errors.
Claude Desktop does not show Juice tools after configuration
Double-check the absolute path in the args array — relative paths do not work in MCP client configs. Open Claude Desktop logs (usually in ~/Library/Logs/Claude/) for the exact startup error from the node process.
Frequently Asked Questions about Juice
What is Juice?
Juice is a Model Context Protocol (MCP) server that tiny taste layer for ai agents It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Juice?
Follow the installation instructions on the Juice GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Juice?
Juice works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Juice free to use?
Yes, Juice is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
Juice Alternatives — Similar Developer Tools Servers
Looking for alternatives to Juice? Here are other popular developer tools servers you can use with Claude, Cursor, and VS Code.
Ecc
★ 188.2kThe agent harness performance optimization system. Skills, instincts, memory, security, and research-first development for Claude Code, Codex, Opencode, Cursor and beyond.
Javaguide
★ 155.8kJava 面试 & 后端通用面试指南，覆盖计算机基础、数据库、分布式、高并发、系统设计与 AI 应用开发
Gemini CLI
★ 104.5kA secure MCP server that wraps the Google Gemini CLI, allowing clients to query Gemini models using local OAuth sessions without requiring an API key. It provides tools for model interaction and diagnostics with built-in protection against command in
Awesome MCP Servers
★ 87.3k⭐ Curated list of Model Context Protocol (MCP) servers - tools that extend Claude Desktop, Cursor, Windsurf, and other MCP clients with custom capabilities.
MCP Servers
★ 86.0kModel Context Protocol Servers
CC Switch
★ 77.5kA cross-platform desktop All-in-One assistant for Claude Code, Codex, OpenCode, OpenClaw, Gemini CLI & Hermes Agent. Only official website: ccswitch.io
Browse More Developer Tools MCP Servers
Explore all developer tools servers available in the MCPgee directory. Each server includes setup guides for Claude, Cursor, and VS Code.
Set Up Juice in Your Editor
Choose your AI client for step-by-step setup instructions.
Quick Config Preview
Add this to your claude_desktop_config.json or .cursor/mcp.json
Ready to use Juice?
Browse our complete directory of 33,000+ MCP servers, read setup guides for your editor, and start building with the Model Context Protocol.