Wren Pre-sign Check

Connect Remote server

claude mcp add --transport http wren-presign-check https://wren-presign-check.wrenonbase.workers.dev/mcp

{
  "mcpServers": {
    "wren-presign-check": {
      "url": "https://wren-presign-check.wrenonbase.workers.dev/mcp"
    }
  }
}

{
  "servers": {
    "wren-presign-check": {
      "type": "http",
      "url": "https://wren-presign-check.wrenonbase.workers.dev/mcp"
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://wren-presign-check.wrenonbase.workers.dev/mcp

Tools 4 found in our last check

• presign_check

  Call before your agent signs anything. Send tx fields (to, data, value, chainId), or typedData (an eth_signTypedData_v4 payload), or untrusted text, with an optional wren-guard policy. Returns block, review or allow, the decoded call and every finding: unlimited approvals, permi…

• screen_text

  Call before your agent acts on untrusted text (a reply, DM, web page, tool output or memory). Returns safe, suspicious or malicious with the matched patterns, after decoding base64, hex, Morse, leetspeak, ROT13, reversed and hidden Unicode. Optional known: your own addresses, to…

• token_facts

  Call before your agent approves, receives or sends a Base ERC-20. Returns code size, EIP-7702 delegation, name, symbol, decimals, supply, proxy and upgrade admin, owner or renounced, and which privileged functions the bytecode has (mint, pause, blocklist, fees, limits, trading s…

• presign_demo

  Free. Runs one fixed example (an unlimited approval, setApprovalForAll, a never-expiring permit, an EIP-7702 delegation, an injected memo or a normal x402 payment) through the same checker, so you can see the report shape before paying for presign_check.

Details

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

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