Web3auth MCP Server

MetaMask Embedded Wallets MCP Server

Build MetaMask Embedded Wallets integrations faster by giving your AI coding assistant live access to the documentation and deep knowledge of the SDK.

There are two things to set up:

1. Skill — Teaches your AI assistant how to think about the SDK: architecture, framework quirks, key derivation rules, and common mistakes. No code in the skill; the MCP provides that.
2. MCP server — Gives your AI assistant real-time access to search docs, fetch examples, and look up SDK types.

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MCP Tools

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Skill

The skill teaches your AI assistant the mental model for MetaMask Embedded Wallets. It includes SDK selection logic, key derivation rules, authentication concepts, platform quirks, and common mistakes that aren't obvious from the docs alone.

Tip: For the best experience, use the MCP server alongside the skill so that your LLM can fetch live docs and examples rather than relying on static text.

Universal install (works with 18+ agents)

npx skills add Web3Auth/web3auth-mcp --skill web3auth -y

The skills CLI by Vercel detects your active AI agent and installs to the right directory automatically — Cursor, Claude Code, Copilot, Kiro, Cline, Codex, Antigravity, and 40+ more.

To install globally (available in all projects) or target a specific agent:

npx skills add Web3Auth/web3auth-mcp --skill web3auth -g -y            # global
npx skills add Web3Auth/web3auth-mcp --skill web3auth -a cursor -y     # Cursor only
npx skills add Web3Auth/web3auth-mcp --skill web3auth -a claude-code -y # Claude Code only

Cursor

npx degit Web3Auth/web3auth-mcp/skills/web3auth .cursor/skills/web3auth

Cursor picks up any SKILL.md inside .cursor/skills/ automatically and activates it when relevant.

Or install via Cursor Marketplace — search "MetaMask Embedded Wallets".

Claude Code CLI

npx degit Web3Auth/web3auth-mcp/skills/web3auth /tmp/web3auth-skill
cat /tmp/web3auth-skill/SKILL.md >> CLAUDE.md

Claude Desktop

Open Claude Desktop → Settings → Custom Instructions and paste the contents of skills/web3auth/SKILL.md directly.

Antigravity

npx degit Web3Auth/web3auth-mcp/skills/web3auth .agent/skills/web3auth

Antigravity picks up skills inside .agent/skills/ automatically. For global installation across all projects, use ~/.gemini/antigravity/skills/ instead.

Windsurf / Cline / Kiro / Continue

npx degit Web3Auth/web3auth-mcp/skills/web3auth .windsurf/skills/web3auth

Place the skill in the tool-specific skills directory. Most tools also accept pasting the contents of SKILL.md into a system prompt or custom instructions field.

Other tools

For any LLM tool with a system prompt or custom instructions field, paste the contents of skills/web3auth/SKILL.md directly.

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MCP Server Setup

Cursor

The fastest way is one click:

Or install via Cursor Marketplace — search "MetaMask Embedded Wallets".

Or add it manually. Open Cursor Settings → Tools & Integrations → MCP and add:

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io"
    }
  }
}

VS Code (GitHub Copilot)

Install from the Visual Studio Marketplace — search "MetaMask Embedded Wallets", or:

code --install-extension Web3Auth.metamask-embedded-wallets

Or use the one-click install URL:

vscode:mcp/install?{"name":"web3auth","url":"https://mcp.web3auth.io"}

Or add manually to your workspace .vscode/mcp.json:

{
  "servers": {
    "web3auth": {
      "type": "http",
      "url": "https://mcp.web3auth.io"
    }
  }
}

JetBrains (IntelliJ, PyCharm, WebStorm, Android Studio)

Install from the JetBrains Marketplace — search "MetaMask Embedded Wallets".

Or add manually in Settings → Tools → AI Assistant → Model Context Protocol (MCP):

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io",
      "transport": "http"
    }
  }
}

Claude Code CLI

claude mcp add --transport http web3auth https://mcp.web3auth.io

Or add manually to your project's claude.json:

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io"
    }
  }
}

Claude Desktop

Open your Claude Desktop configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Add the server to the mcpServers section:

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io"
    }
  }
}

Restart Claude Desktop and ask: "Search MetaMask Embedded Wallets docs for React quick start" to verify the connection.

ChatGPT Desktop

Open ChatGPT Desktop → Settings → Connections and add a new MCP server:

• Name: web3auth
• URL: https://mcp.web3auth.io

Windsurf

Open Windsurf Settings → MCP and add:

{
  "mcpServers": {
    "web3auth": {
      "serverUrl": "https://mcp.web3auth.io"
    }
  }
}

Or edit ~/.codeium/windsurf/mcp_config.json directly.

Kiro (AWS)

Add to your project's .kiro/settings/mcp.json:

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io"
    }
  }
}

Warp Terminal

In Warp, open Settings → AI → MCP Servers and click Add Server:

• Name: web3auth
• URL: https://mcp.web3auth.io

Or use Warp's one-click MCP install if available in your version.

Cline (VS Code)

Add to your Cline MCP settings (Ctrl+Shift+P → "Cline: Open MCP Settings"):

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io",
      "transport": "http"
    }
  }
}

Continue.dev

Add to your Continue config.json (open with Ctrl+Shift+P → "Continue: Open config.json"):

{
  "mcpServers": [
    {
      "name": "web3auth",
      "url": "https://mcp.web3auth.io"
    }
  ]
}

Zed

Add to your Zed settings.json (Cmd+, to open):

{
  "context_servers": {
    "web3auth": {
      "command": {
        "path": "npx",
        "args": ["-y", "mcp-remote", "https://mcp.web3auth.io"]
      }
    }
  }
}

Or install via Zed Extensions — search "MetaMask Embedded Wallets".

Antigravity

Open your MCP configuration file:

• macOS/Linux: ~/.config/antigravity/mcp.json
• Windows: %APPDATA%\antigravity\mcp.json

Add the server to the mcpServers section:

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io"
    }
  }
}

Antigravity hot-reloads MCP config changes — no restart required.

Xcode (via GitHub Copilot)

Xcode 26.3+ supports MCP via GitHub Copilot. Add the server to your Copilot MCP config or use the VS Code extension setup above (Copilot MCP registry is shared).

Alternatively, configure Xcode's agentic tools to point at https://mcp.web3auth.io directly via Settings → Copilot → MCP Servers.

Eclipse (via GitHub Copilot)

Eclipse with GitHub Copilot supports MCP. Add via Eclipse → Preferences → GitHub Copilot → MCP Servers → Add Server:

• Name: web3auth
• URL: https://mcp.web3auth.io

Neovim (avante.nvim)

In your Lua config, add via mcphub.nvim:

require("mcphub").setup({
  servers = {
    web3auth = {
      url = "https://mcp.web3auth.io",
      transport = "streamable-http",
    },
  },
})

Or using mcp-remote for compatibility:

require("avante").setup({
  mcp = {
    servers = {
      web3auth = {
        command = "npx",
        args = { "-y", "mcp-remote", "https://mcp.web3auth.io" },
      },
    },
  },
})

Neovim (codecompanion.nvim)

require("codecompanion").setup({
  extensions = {
    mcp = {
      servers = {
        web3auth = {
          command = "npx",
          args = { "-y", "mcp-remote", "https://mcp.web3auth.io" },
        },
      },
    },
  },
})

Amp (Sourcegraph)

Add to your Amp MCP configuration:

{
  "mcpServers": {
    "web3auth": {
      "url": "https://mcp.web3auth.io"
    }
  }
}

Goose

Add to ~/.config/goose/config.yaml:

extensions:
  - name: web3auth
    type: http
    url: https://mcp.web3auth.io

5ire

In 5ire Settings → MCP Servers → Add:

• Name: web3auth
• URL: https://mcp.web3auth.io

Aider

Aider supports MCP via the LiteLLM bridge. Add to your Aider config:

mcp_servers:
  web3auth:
    command: npx
    args: ["-y", "mcp-remote", "https://mcp.web3auth.io"]

Codex CLI

For Codex CLI or any stdio-only agent, use mcp-remote to bridge the HTTP endpoint:

npm install -g mcp-remote

Then add to ~/.codex/config.toml:

[mcp_servers.web3auth]
command = "npx"
args = ["-y", "mcp-remote", "https://mcp.web3auth.io"]

Or add to your agent's JSON config:

{
  "mcpServers": {
    "web3auth": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://mcp.web3auth.io"]
    }
  }
}

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Static docs (llms.txt)

If your AI tool doesn't support MCP yet, use the static documentation file instead:

https://docs.metamask.io/llms-full.txt

For tools that support the llms.txt spec and can index docs automatically:

https://docs.metamask.io/llms.txt

Warning: The static file is a snapshot and may not include the latest updates. Use the MCP server when possible for always-current docs.

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Start building

Once the skill and MCP are set up, ask your AI assistant directly. Good starting prompts:

• "Add MetaMask Embedded Wallets to my React app with Google login."
• "Set up social login wallets in my Next.js app using Wagmi."
• "Integrate embedded wallets in my Flutter app."
• "Why are my users getting different wallet addresses after I changed the login method?"

Tip: Use planning mode (where available) for your initial prompt. Review the plan before generating code — this catches architecture mistakes early and avoids config errors that would change wallet addresses in production.

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Distribution

This repo ships artifacts for every major developer platform:

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Environment Variables

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Development

npm install
npm run build
npm start          # Run via stdio
npm run dev        # Watch mode

Updating Content

When a product update ships, only a few files need changing:

License

MIT