Core
A framework helps you quickly build AI Native IDE products. MCP Client, supports Model Context Protocol (MCP) tools via MCP server.
What is Core?
Core is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to framework helps you quickly build ai native ide products. mcp client, supports model context protocol (mcp) tools via mcp server.
A framework helps you quickly build AI Native IDE products. MCP Client, supports Model Context Protocol (MCP) tools via MCP server.
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- A framework helps you quickly build AI Native IDE products.
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx coreConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Core
OpenSumi Core is an open-source framework for building AI-native IDE products, providing a full-featured code editor foundation with integrated MCP client support for Model Context Protocol tools. It supports multiple deployment targets — cloud IDE, desktop (Electron), web-based, and mini-app variants — and is used as the foundation for products like CodeFuse AI IDE and CodeBlitz. Developers use it to rapidly scaffold intelligent development environments that can connect to MCP servers and surface AI capabilities directly within the editor experience.
Prerequisites
- Node.js 16+ and Yarn package manager installed
- Git for cloning the repository
- An MCP server to connect to (the framework acts as an MCP client host)
- For desktop builds: Electron and platform build tools appropriate for your OS
Clone the OpenSumi core repository
Clone the repository to your local machine. The monorepo contains the core framework and multiple example starter projects.
git clone https://github.com/opensumi/core.git
cd coreInstall dependencies
Install all workspace dependencies using Yarn. The init script handles bootstrapping the monorepo packages.
yarn install
yarn run initDownload optional extensions
Optionally download the pre-built VS Code-compatible extensions for a richer editor experience out of the box.
yarn run download-extensionStart the development IDE
Launch the development server. Optionally set MY_WORKSPACE to the directory you want the IDE to open by default.
MY_WORKSPACE=/path/to/your/project yarn run startConfigure MCP server connections
OpenSumi implements an MCP client that can connect to MCP servers. Configure MCP server endpoints in the IDE settings or the workspace configuration file to expose AI tools within the editor.
{
"mcpServers": {
"your-mcp-server": {
"command": "npx",
"args": ["-y", "your-mcp-server-package"]
}
}
}Build for your target platform
Build the IDE for your chosen deployment target. OpenSumi supports cloud IDE, Electron desktop, web-only, and mini-app configurations.
# For desktop (Electron) build:
yarn run build:electron
# For web/cloud build:
yarn run buildCore Examples
Client configuration
MCP server connection configuration for an OpenSumi-based IDE workspace.
{
"mcpServers": {
"filesystem": {
"command": "npx",
"args": ["-y", "@modelcontextprotocol/server-filesystem", "/workspace"]
},
"github": {
"command": "npx",
"args": ["-y", "@modelcontextprotocol/server-github"],
"env": {
"GITHUB_PERSONAL_ACCESS_TOKEN": "your-token-here"
}
}
}
}Prompts to try
Example tasks to perform once MCP servers are connected in an OpenSumi IDE.
- "List the files in the current workspace and summarize the project structure"
- "Search the codebase for all usages of the authenticate function"
- "Create a new React component file with TypeScript and a basic test file"
- "Show me the open GitHub issues for this repository"
- "Refactor the UserService class to follow the repository pattern"Troubleshooting Core
yarn run init fails with dependency resolution errors
Ensure you are using the Node.js version specified in the repository's .nvmrc or package.json engines field. Use nvm to switch versions: 'nvm use'. Then delete node_modules and yarn.lock and retry.
IDE starts but MCP tools do not appear
Check that your MCP server configuration is in the correct location for your OpenSumi build variant. Verify the MCP server process starts correctly by running the command directly in a terminal and checking for errors.
Electron build fails on macOS with code signing errors
For development builds, disable code signing by setting CSC_IDENTITY_AUTO_DISCOVERY=false in your environment. For production distribution, configure proper Apple Developer certificates in the Electron builder config.
Frequently Asked Questions about Core
What is Core?
Core is a Model Context Protocol (MCP) server that framework helps you quickly build ai native ide products. mcp client, supports model context protocol (mcp) tools via mcp server. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Core?
Follow the installation instructions on the Core GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Core?
Core works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Core free to use?
Yes, Core is open source and available under the MIT license. You can use it freely in both personal and commercial projects.
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Set Up Core 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
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