NestDaddy
All servers NestDaddy MCP Blog Sign inTry it free
AI and media

Warrant

io.github.s0fractal/warrant · v0.9.0

Record an agent's decisions with reasons anyone can re-execute offline — verify recomputes them.

Website Source code Set it up

Connect Runs on your machine

Terminal
claude mcp add warrant -e WARRANT_STORE=<WARRANT_STORE> -e WARRANT_KEY=<WARRANT_KEY> -e WARRANT_ACTOR=<WARRANT_ACTOR> -- uvx warrant-verify==0.9.0
claude_desktop_config.json
{
  "mcpServers": {
    "warrant": {
      "command": "uvx",
      "args": [
        "warrant-verify==0.9.0"
      ],
      "env": {
        "WARRANT_STORE": "<WARRANT_STORE>",
        "WARRANT_KEY": "<WARRANT_KEY>",
        "WARRANT_ACTOR": "<WARRANT_ACTOR>"
      }
    }
  }
}
~/.cursor/mcp.json
{
  "mcpServers": {
    "warrant": {
      "command": "uvx",
      "args": [
        "warrant-verify==0.9.0"
      ],
      "env": {
        "WARRANT_STORE": "<WARRANT_STORE>",
        "WARRANT_KEY": "<WARRANT_KEY>",
        "WARRANT_ACTOR": "<WARRANT_ACTOR>"
      }
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "warrant": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "warrant-verify==0.9.0"
      ],
      "env": {
        "WARRANT_STORE": "<WARRANT_STORE>",
        "WARRANT_KEY": "<WARRANT_KEY>",
        "WARRANT_ACTOR": "<WARRANT_ACTOR>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

NameDescription
WARRANT_STORE
Optional		Absolute path to the warrant store this server files into and verifies. Defaults to .warrants relative to the server process's working directory, which an MCP host does not guarantee.
WARRANT_KEY
Optional, secret		Ed25519 signing key. If unset, one is generated next to the store on the first filing and the result says so; any process that can read it can sign as this actor.
WARRANT_ACTOR
Optional		Actor id written into filed warrants. Defaults to mcp-client@<hostname>.

Details

Package[email protected] (PYPI, stdio)
First published1 Aug 2026
Last updated1 Aug 2026
Registry nameio.github.s0fractal/warrant

More ai and media servers See all

  • bv7x strategy agents

    Find bv7x prediction agents on Robinhood Chain by market; quote their sealed calls, sold via x402.

  • Chronary

    Calendar API for AI agents: events, availability, Google/Microsoft setup, scheduling, and iCal.

  • Mastering

    Audio mastering for AI agents: LUFS analysis, Suno artifact cleanup, free daily master.

  • Modulos AI Governance Platform

    Evaluate Modulos (EU AI Act, ISO 42001, NIST AI RMF): capabilities, trust, comparisons. Book a demo.

  • naulon

    Check citations and retractions by DOI, and see the x402 price an AI agent pays to cite a source.

  • NextConstraint

    Your SaaS funnel's costliest leak, its fix, watchdog alerts and verdicts, from NextConstraint.

Listing data from the official MCP registry. Status and tools from NestDaddy's daily check. Browse all MCP servers.