withdrawWETH

THE RISK

Critical Risk

Why withdrawWETH needs a policy

This tool executes a financial transaction that converts wrapped Ethereum (WETH) tokens to native ETH, moving cryptocurrency value. Although the conversion is 1:1, it represents an irreversible movement of financial assets from a wrapped token contract to native currency, making it a financial operation. The sibling tool 'depositWETH' confirms this server handles token conversion/financial operations.

From the tool's definition Tool description states it 'Unwrap WETH back to native ETH by withdrawing from the WETH contract' and 'Burns your WETH and returns an equal amount of native ETH.' This directly moves cryptocurrency assets (WETH to ETH conversion).

Documented attack patterns abuse exactly the kind of access withdrawWETH gives an agent:

POLICY

How to control withdrawWETH

PolicyLayer is an MCP gateway — it sits between your AI agents and Agentek Eth, and nothing reaches the server without passing your rules. This is the rule we recommend for withdrawWETH:

policy.json

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

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

Create a free account and register Agentek Eth — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Agentek Eth tools

Financial depositWETH Wrap native ETH into WETH (Wrapped ETH) by depositing into the WETH contract. You receive Financial intentAaveDeposit Deposits tokens into the Aave protocol to supply liquidity and earn interest. Financial intentAaveWithdraw Withdraws tokens from Aave, redeeming your supplied assets (aTokens). Financial intentApproveSlowTransfer Guardian approves a transfer in SLOW contract Financial intentDepositAcross Bridge ERC20 tokens cross-chain via Across Protocol. Automatically handles token approval Financial intentDepositToSlow Deposit tokens or ETH into SLOW contract with a timelock Financial intentTransfer Transfer ERC20 tokens or native ETH to an address or ENS name. Supports ENS resolution, au Financial intentTransferFrom Transfer ERC20 tokens from another address using transferFrom. Requires prior ERC20 approv

All 165 Agentek Eth tools →

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Go deeper

Critical-risk tools in Agentek Eth → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about withdrawWETH

What does the withdrawWETH tool do? +

Unwrap WETH back to native ETH by withdrawing from the WETH contract. Burns your WETH and returns an equal amount of native ETH. It is categorised as a Financial tool in the Agentek Eth MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on withdrawWETH? +

Register the Agentek Eth MCP server in PolicyLayer and add a rule for withdrawWETH: 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 Agentek Eth. Nothing to install.

What risk level is withdrawWETH? +

withdrawWETH 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 withdrawWETH? +

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

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

withdrawWETH is provided by the Agentek Eth MCP server (nanidao/agentek). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Agentek Eth tool call.

Start from Agentek Eth, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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