intentApprove

THE RISK

Critical Risk

Why intentApprove needs a policy

Approving token spending on Ethereum grants an external contract or address the ability to transfer tokens on behalf of the user. This is a financial operation with significant risk — a malicious or incorrect approval can lead to complete loss of the approved token amount. It falls under Financial as it directly enables financial transactions/obligations on-chain.

From the tool's definition Creates an intent to approve token spending

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

POLICY

How to control intentApprove

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 intentApprove:

policy.json

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

Any call to intentApprove 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

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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

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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 intentApprove

What does the intentApprove tool do? +

Creates an intent to approve token spending. Supports. 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 intentApprove? +

Register the Agentek Eth MCP server in PolicyLayer and add a rule for intentApprove: 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 intentApprove? +

intentApprove 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 intentApprove? +

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

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

intentApprove 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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