call_contract

Call a function on a Stacks smart contract. Signs and broadcasts the transaction. For typed arguments, use objects like {type:

SERVERAibtc SOURCEaibtcdev/aibtc-mcp-server

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/io-github-aibtcdev-mcp-server/call-contract.md

WHAT IT DOES

What call_contract does on Aibtc

AI agents invoke call_contract to trigger actions in Aibtc. 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 call_contract is rated High

This tool executes arbitrary smart contract functions on the Stacks blockchain, signing and broadcasting transactions. Smart contract calls can have irreversible on-chain effects including token transfers, state mutations, or destructive operations depending on the contract function called. The ability to sign and broadcast arbitrary transactions gives this tool an extremely high blast radius if misused.

From the tool's definition 'Call a function on a Stacks smart contract. Signs and broadcasts the transaction.'

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs call_contract safely

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

call_contract Rate-limited

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": {
    "call_contract": {
      "limits": [
        {
          "counter": "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 Aibtc, apply this rule, and every call_contract call is checked against it from then on.

FAQ

Questions about call_contract

What does the call_contract tool do? +

Call a function on a Stacks smart contract. Signs and broadcasts the transaction. For typed arguments, use objects like {type:. It is categorised as a Execute tool in the Aibtc MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on call_contract? +

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

What risk level is call_contract? +

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

Can I rate-limit call_contract? +

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

Set action: deny in the PolicyLayer policy for 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 call_contract? +

call_contract is provided by the Aibtc MCP server (aibtcdev/aibtc-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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