lido_approve_token · Lido MCP Server MCP: Risk & Policy

WHAT IT DOES

What lido_approve_token does on Lido MCP Server

AI agents use lido_approve_token to create or update resources in Lido MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Lido MCP Server environment.

WHY IT NEEDS A POLICY

Why lido_approve_token needs a policy

This tool creates or modifies token allowances (ERC-20 approve function), which is a Write operation - it changes blockchain state but is reversible (the approval can be revoked or modified).

From the tool's definition Tool description states 'Approve a spender to use stETH, wstETH, or LDO tokens on your behalf.' The word 'Approve' indicates creation of a token allowance, which is a reversible state modification on the blockchain.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

lido_approve_token Rate-limited

lido_approve_token stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "lido_approve_token": {
      "limits": [
        {
          "counter": "lido_approve_token_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Lido MCP Server, so you can run agents against it safely.

FAQ

Questions about lido_approve_token

What does the lido_approve_token tool do? +

Approve a spender to use stETH, wstETH, or LDO tokens on your behalf. It is categorised as a Write tool in the Lido MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on lido_approve_token? +

Register the Lido MCP Server MCP server in PolicyLayer and add a rule for lido_approve_token: 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 Lido MCP Server. Nothing to install.

What risk level is lido_approve_token? +

lido_approve_token is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit lido_approve_token? +

Yes. Add a rate_limit block to the lido_approve_token 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 lido_approve_token completely? +

Set action: deny in the PolicyLayer policy for lido_approve_token. 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 lido_approve_token? +

lido_approve_token is provided by the Lido MCP Server MCP server (the-wunmi/lido-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.