alex_execute_swap · Stacks AI MCP Server MCP: Risk & Policy

WHAT IT DOES

What alex_execute_swap does on Stacks AI MCP Server

AI agents use alex_execute_swap to commit financial operations through Stacks AI MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why alex_execute_swap needs a policy

This tool executes an actual token swap on a DeFi AMM (Automated Market Maker), which directly moves/exchanges financial assets on the blockchain. This is a financial transaction that commits real value and cannot be trivially reversed, making it Financial category with critical severity due to potential for large monetary loss if misused by an AI agent.

From the tool's definition Execute 1-hop token swap on ALEX AMM via swap-helper

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

alex_execute_swap Approval-gated

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

View as policy code

policy.json

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

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

FAQ

Questions about alex_execute_swap

What does the alex_execute_swap tool do? +

Execute 1-hop token swap on ALEX AMM via swap-helper. It is categorised as a Financial tool in the Stacks AI MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on alex_execute_swap? +

Register the Stacks AI MCP Server MCP server in PolicyLayer and add a rule for alex_execute_swap: 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 Stacks AI MCP Server. Nothing to install.

What risk level is alex_execute_swap? +

alex_execute_swap 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 alex_execute_swap? +

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

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

alex_execute_swap is provided by the Stacks AI MCP Server MCP server (stack-ai-mcp/stacks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.