stack_stx · Stacks AI MCP Server MCP: Risk & Policy

WHAT IT DOES

What stack_stx does on Stacks AI MCP Server

AI agents use stack_stx 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 stack_stx needs a policy

Stacking STX tokens commits them to a locking period on the Stacks blockchain, creating a financial obligation by locking funds for a specified duration. This is a financial operation that commits assets in a way that cannot be reversed until the lock period ends, making it a financial commitment with high blast radius if misused by an AI agent.

From the tool's definition Stack STX tokens for a specified duration

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stack_stx Approval-gated

Any call to stack_stx 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": {
    "stack_stx": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL →

Instant setup, no code required.

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 stack_stx

What does the stack_stx tool do? +

Stack STX tokens for a specified duration. 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 stack_stx? +

Register the Stacks AI MCP Server MCP server in PolicyLayer and add a rule for stack_stx: 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 stack_stx? +

stack_stx 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 stack_stx? +

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

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

stack_stx 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.