stx_call_contract

Call a public Clarity smart contract function.

SERVERBitcoin wallet MCP server SOURCEmarkmhendrickson/mcp-server-bitcoin

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/markmhendrickson-mcp-server-bitcoin/stx-call-contract.md

WHAT IT DOES

What stx_call_contract does on Bitcoin wallet MCP server

AI agents invoke stx_call_contract to trigger actions in Bitcoin wallet MCP server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why stx_call_contract is rated High

Executing a smart contract function on-chain triggers external operations with real blockchain effects. While some contract calls are read-only, 'public' Clarity functions can transfer tokens, modify state, or invoke other contracts irreversibly.

From the tool's definition Call a public Clarity smart contract function

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs stx_call_contract safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Bitcoin wallet MCP server, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For stx_call_contract, this is the rule to start with:

stx_call_contract Rate-limited

stx_call_contract stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "stx_call_contract": {
      "limits": [
        {
          "counter": "stx_call_contract_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Bitcoin wallet MCP server, apply this rule, and every stx_call_contract call is checked against it from then on.

FAQ

Questions about stx_call_contract

What does the stx_call_contract tool do? +

Call a public Clarity smart contract function. It is categorised as a Execute tool in the Bitcoin wallet MCP server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on stx_call_contract? +

Register the Bitcoin wallet MCP server MCP server in PolicyLayer and add a rule for stx_call_contract: 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_call_contract? +

stx_call_contract is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit stx_call_contract? +

Yes. Add a rate_limit block to the stx_call_contract 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_call_contract completely? +

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

stx_call_contract 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.

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