send_token

THE RISK

Critical Risk

Why send_token needs a policy

Even though the description is empty, the tool name 'send_token' on a crypto wallet MCP server strongly implies transferring cryptocurrency or tokens to another address. This constitutes a financial operation that moves crypto assets, potentially irreversibly. The server context confirms this is a wallet server for multi-chain crypto operations including transfers.

From the tool's definition Tool name 'send_token' on a server described as providing 'multi-chain crypto operations: transfers, token management, DeFi (swap, lend, stake, bridge, perp)' with sibling tools like 'bridge', 'approve_token', and explicit mention of 'transfers'.

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

POLICY

How to control send_token

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 send_token:

policy.json

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

Any call to send_token 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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EXPLORE

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Go deeper

Critical-risk tools in Waiaas → 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 send_token

What does the send_token tool do? +

send_token. 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 send_token? +

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

What risk level is send_token? +

send_token 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 send_token? +

Yes. Add a rate_limit block to the send_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 send_token completely? +

Set action: deny in the PolicyLayer policy for send_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 send_token? +

send_token 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.

CHECK YOUR STACK →