Sequesign MCP Server

Name: Sequesign MCP Server
Author: io.github.Sequesign

io.github.Sequesign/sequesign

Repository Registry

What is the Sequesign MCP server?

Cryptographically verifiable receipts of an agent's delegated work, verified offline.

How to install Sequesign

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

SEQUESIGN_MODE
Transport: 'direct' (default; sign locally, an independent witness co-signs) or 'managed' (route through the Sequesign broker for a registered identity).
SEQUESIGN_API_KEY
secret
Sequesign write-class API key (from the dashboard). Required for managed mode; in direct mode it authenticates the hosted witness.
SEQUESIGN_AGENT_PRIVATE_KEY
secret
Ed25519 PKCS#8 private-key PEM for the agent. In managed mode, the key registered to your API key. In direct mode, omit to mint an ephemeral key per session.
SEQUESIGN_PACKAGE_DIR
Directory where sealed receipt packages are written. Defaults to a temporary directory.

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "sequesign": {
      "command": "npx",
      "args": [
        "-y",
        "@sequesign/mcp"
      ],
      "env": {
        "SEQUESIGN_MODE": "<YOUR_SEQUESIGN_MODE>",
        "SEQUESIGN_API_KEY": "<YOUR_SEQUESIGN_API_KEY>",
        "SEQUESIGN_AGENT_PRIVATE_KEY": "<YOUR_SEQUESIGN_AGENT_PRIVATE_KEY>",
        "SEQUESIGN_PACKAGE_DIR": "<YOUR_SEQUESIGN_PACKAGE_DIR>"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "sequesign": {
      "command": "npx",
      "args": [
        "-y",
        "@sequesign/mcp"
      ],
      "env": {
        "SEQUESIGN_MODE": "<YOUR_SEQUESIGN_MODE>",
        "SEQUESIGN_API_KEY": "<YOUR_SEQUESIGN_API_KEY>",
        "SEQUESIGN_AGENT_PRIVATE_KEY": "<YOUR_SEQUESIGN_AGENT_PRIVATE_KEY>",
        "SEQUESIGN_PACKAGE_DIR": "<YOUR_SEQUESIGN_PACKAGE_DIR>"
      }
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "sequesign": {
      "command": "npx",
      "args": [
        "-y",
        "@sequesign/mcp"
      ],
      "env": {
        "SEQUESIGN_MODE": "<YOUR_SEQUESIGN_MODE>",
        "SEQUESIGN_API_KEY": "<YOUR_SEQUESIGN_API_KEY>",
        "SEQUESIGN_AGENT_PRIVATE_KEY": "<YOUR_SEQUESIGN_AGENT_PRIVATE_KEY>",
        "SEQUESIGN_PACKAGE_DIR": "<YOUR_SEQUESIGN_PACKAGE_DIR>"
      }
    }
  }
}

VS Code

.vscode/mcp.json

{
  "servers": {
    "sequesign": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@sequesign/mcp"
      ],
      "env": {
        "SEQUESIGN_MODE": "<YOUR_SEQUESIGN_MODE>",
        "SEQUESIGN_API_KEY": "<YOUR_SEQUESIGN_API_KEY>",
        "SEQUESIGN_AGENT_PRIVATE_KEY": "<YOUR_SEQUESIGN_AGENT_PRIVATE_KEY>",
        "SEQUESIGN_PACKAGE_DIR": "<YOUR_SEQUESIGN_PACKAGE_DIR>"
      }
    }
  }
}

Claude Code

claude mcp add sequesign --env SEQUESIGN_MODE=<YOUR_SEQUESIGN_MODE> --env SEQUESIGN_API_KEY=<YOUR_SEQUESIGN_API_KEY> --env SEQUESIGN_AGENT_PRIVATE_KEY=<YOUR_SEQUESIGN_AGENT_PRIVATE_KEY> --env SEQUESIGN_PACKAGE_DIR=<YOUR_SEQUESIGN_PACKAGE_DIR> -- npx -y @sequesign/mcp