Sigil

Overview

Sigil is a Model Context Protocol server that provides a local keystore for signing EVM transactions. It allows Claude and other MCP-compatible AI assistants to sign transactions without ever accessing the private key, keeping your credentials secure while enabling seamless transaction signing in conversation and agent workflows.

The server runs locally via the npm package sigild, communicating over stdio on your machine. Installation is straightforward with npx -y sigild, and no credentials are required to get started. Sigil is published under the Apache-2.0 license with source code available at cdrn/sigil on GitHub.

Sigil is categorized as Development on mcp.site and integrates with all major MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain Sigil for cdrn, claim this listing to verify ownership and keep the information current.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "sigil": {
      "command": "npx",
      "args": [
        "-y",
        "sigild"
      ]
    }
  }
}