buy_yt

THE RISK

Critical Risk

Why buy_yt needs a policy

This tool executes a financial transaction on a DeFi protocol (Pendle), purchasing yield tokens with real crypto assets. It commits funds to a leveraged position, constituting a financial obligation. Misuse could result in significant financial loss due to the leveraged nature of YT tokens, which can lose value rapidly.

From the tool's definition Buy YT (Yield Token) from a Pendle market for leveraged yield exposure

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

POLICY

How to control buy_yt

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

policy.json

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

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

Create a free account and register Waiaas — 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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The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about buy_yt

What does the buy_yt tool do? +

Buy YT (Yield Token) from a Pendle market for leveraged yield exposure. It is categorised as a Financial tool in the Waiaas MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on buy_yt? +

Register the Waiaas MCP server in PolicyLayer and add a rule for buy_yt: 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 Waiaas. Nothing to install.

What risk level is buy_yt? +

buy_yt 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 buy_yt? +

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

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

buy_yt is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Waiaas tool call.

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

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