Agoric Dev MCP Server

An MCP (Model Context Protocol) server that provides AI assistants with tools for Agoric smart contract development. This server enables Claude and other MCP-compatible AI assistants to help developers build, test, debug, and deploy smart contracts on the Agoric blockchain.

Features

The server provides tools across 10 categories:

• Project Setup - Initialize and configure Agoric projects
• Core Patterns - Agoric development patterns and best practices
• Contract Structure - Smart contract scaffolding and structure
• Zoe & ERTP - Zoe contract framework and ERTP asset handling
• Orchestration - Cross-chain orchestration capabilities
• Durability - Durable object patterns for upgrade-safe contracts
• Testing - Contract testing utilities and patterns
• Debugging & Tracing - Debug and trace contract execution
• Security - Security best practices and vulnerability checks
• Discovery & Help - Documentation and API discovery

Quick Start (Claude Code)

claude mcp add --transport sse agoric-dev https://agoric-dev-mcp.agoric-core.workers.dev/sse

For local development, use http://localhost:8787/sse instead.

Develop locally

# install dependencies
yarn install

# run locally
yarn start

You should be able to open http://localhost:8787/ in your browser

Connect the MCP inspector to your server

To explore your new MCP api, you can use the MCP Inspector.

• Start it with npx @modelcontextprotocol/inspector
• Within the inspector, switch the Transport Type to SSE and enter http://localhost:8787/sse as the URL of the MCP server to connect to, and click "Connect"
• You will navigate to a (mock) user/password login screen. Input any email and pass to login.
• You should be redirected back to the MCP Inspector and you can now list and call any defined tools!

Connect Claude Desktop to your local MCP server

The MCP inspector is great, but we really want to connect this to Claude! Follow Anthropic's Quickstart and within Claude Desktop go to Settings > Developer > Edit Config to find your configuration file.

Open the file in your text editor and replace it with this configuration:

{
  "mcpServers": {
    "math": {
      "command": "npx",
      "args": ["mcp-remote", "http://localhost:8787/sse"]
    }
  }
}

This will run a local proxy and let Claude talk to your MCP server over HTTP

When you open Claude a browser window should open and allow you to login. You should see the tools available in the bottom right. Given the right prompt Claude should ask to call the tool.

Deploy to Cloudflare

1. npx wrangler kv namespace create OAUTH_KV
2. Follow the guidance to add the kv namespace ID to wrangler.jsonc
3. npm run deploy

Call your newly deployed remote MCP server from a remote MCP client

Just like you did above in "Develop locally", run the MCP inspector:

npx @modelcontextprotocol/inspector@latest

Then enter the workers.dev URL (ex: worker-name.account-name.workers.dev/sse) of your Worker in the inspector as the URL of the MCP server to connect to, and click "Connect".

You've now connected to your MCP server from a remote MCP client.

Connect Claude Desktop to your remote MCP server

Update the Claude configuration file to point to your workers.dev URL (ex: worker-name.account-name.workers.dev/sse) and restart Claude

{
  "mcpServers": {
    "math": {
      "command": "npx",
      "args": ["mcp-remote", "https://worker-name.account-name.workers.dev/sse"]
    }
  }
}

Debugging

Should anything go wrong it can be helpful to restart Claude, or to try connecting directly to your MCP server on the command line with the following command.

npx mcp-remote http://localhost:8787/sse

In some rare cases it may help to clear the files added to ~/.mcp-auth

rm -rf ~/.mcp-auth