ethSign

A financial tool on the MCP Ethers Wallet MCP server.

SERVERMCP Ethers Wallet SOURCEcrazyrabbitltc/mcp-ethers-server

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/crazyrabbitltc-mcp-ethers-server/ethsign.md

WHAT IT DOES

What ethSign does on MCP Ethers Wallet

AI agents use ethSign to commit financial operations through MCP Ethers Wallet, usually the final step of a payment, billing, or trading workflow. A call moves real money.

RISK

Why ethSign is rated Critical

On an Ethereum wallet server, 'ethSign' most likely signs transactions or messages using a private key. Signing can authorize financial transactions, token approvals, or contract interactions. Given sibling tools like approveERC20, approveNFT, and contractCall, a signing tool could authorize irreversible financial operations.

From the tool's definition Tool name 'ethSign' on a server that manages Ethereum wallets and executes smart contract operations; description is empty and uninformative.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs ethSign safely

PolicyLayer is an MCP gateway: it sits between your AI agents and MCP Ethers Wallet, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For ethSign, this is the rule to start with:

ethSign Approval-gated

Any call to ethSign is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ethSign": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect MCP Ethers Wallet, apply this rule, and every ethSign call is checked against it from then on.

FAQ

Questions about ethSign

What does the ethSign tool do? +

ethSign is a financial tool on the MCP Ethers Wallet MCP server. It is categorised as a Financial tool in the MCP Ethers Wallet MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on ethSign? +

Register the MCP Ethers Wallet MCP server in PolicyLayer and add a rule for ethSign: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MCP Ethers Wallet. Nothing to install.

What risk level is ethSign? +

ethSign is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit ethSign? +

Yes. Add a rate_limit block to the ethSign rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block ethSign completely? +

Set action: deny in the PolicyLayer policy for ethSign. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides ethSign? +

ethSign is provided by the MCP Ethers Wallet MCP server (crazyrabbitltc/mcp-ethers-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on MCP Ethers Wallet, and thousands of servers like it.

This server

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Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →