three.ws Provenance

three.ws Provenance is a local MCP server: Append-only, signed, on-chain-verifiable agent action log — record and audit what agents did. Install it from npm as @three-ws/provenance-mcp.

Claude CodeCodexAntigravity

commandprompt

Terminal

claude mcp add io-github-nirholas-provenance-mcp -e THREE_WS_BASE=... -e THREE_WS_TIMEOUT_MS=... -e THREE_WS_TOKEN=... -e THREE_WS_SIGNER_KEY=... -- npx -y @three-ws/provenance-mcp

Run in your project folder. Add --scope user to use it everywhere.

Add to claude_desktop_config.json or .cursor/mcp.json.

{
  "mcpServers": {
    "io-github-nirholas-provenance-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@three-ws/provenance-mcp"
      ],
      "env": {
        "THREE_WS_BASE": "...",
        "THREE_WS_TIMEOUT_MS": "...",
        "THREE_WS_TOKEN": "...",
        "THREE_WS_SIGNER_KEY": "..."
      }
    }
  }
}

Fill in the environment variables with your own credentials.

• Runtime: Node.js 18+ (runs with npx).
• MCP client: Claude Code, Codex, Antigravity, Claude Desktop, Cursor or any other client that speaks MCP over stdio.
• Environment variables: THREE_WS_BASE, THREE_WS_TIMEOUT_MS, THREE_WS_TOKEN, THREE_WS_SIGNER_KEY