stx_stack · Bitcoin wallet MCP server MCP: Risk & Policy

WHAT IT DOES

What stx_stack does on Bitcoin wallet MCP server

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

WHY IT NEEDS A POLICY

Why stx_stack needs a policy

This tool locks STX tokens (a financial asset) for reward cycles, committing the user's funds to a time-locked financial operation. Locking cryptocurrency is a financial commitment that cannot be easily undone during the lock period, making it both Financial and potentially Destructive in nature. Financial is the most severe applicable category.

From the tool's definition Initiate STX stacking (solo). Locks STX for reward cycles

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

stx_stack Approval-gated

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

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Instant setup, no code required.

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

FAQ

Questions about stx_stack

What does the stx_stack tool do? +

Initiate STX stacking (solo). Locks STX for reward cycles. It is categorised as a Financial tool in the Bitcoin wallet MCP server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on stx_stack? +

Register the Bitcoin wallet MCP server MCP server in PolicyLayer and add a rule for stx_stack: 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 Bitcoin wallet MCP server. Nothing to install.

What risk level is stx_stack? +

stx_stack 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 stx_stack? +

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

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

stx_stack is provided by the Bitcoin wallet MCP server MCP server (markmhendrickson/mcp-server-bitcoin). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.