prepare_voucher_execution_instructions

WHAT IT DOES

What prepare_voucher_execution_instructions does on Cartesi Knowledge MCP Server

AI agents invoke prepare_voucher_execution_instructions to trigger actions in Cartesi Knowledge 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.

WHY IT NEEDS A POLICY

Why prepare_voucher_execution_instructions needs a policy

The tool generates cast commands for executing a Cartesi voucher. Voucher execution in Cartesi triggers on-chain transactions that carry out irreversible blockchain operations (e.g., token transfers, contract calls).

From the tool's definition Generate cast commands for executing a Cartesi voucher

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

prepare_voucher_execution_instructions Rate-limited

prepare_voucher_execution_instructions 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": {
    "prepare_voucher_execution_instructions": {
      "limits": [
        {
          "counter": "prepare_voucher_execution_instructions_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about prepare_voucher_execution_instructions

What does the prepare_voucher_execution_instructions tool do? +

Generate cast commands for executing a Cartesi voucher. It is categorised as a Execute tool in the Cartesi Knowledge 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 prepare_voucher_execution_instructions? +

Register the Cartesi Knowledge MCP Server MCP server in PolicyLayer and add a rule for prepare_voucher_execution_instructions: 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 Cartesi Knowledge MCP Server. Nothing to install.

What risk level is prepare_voucher_execution_instructions? +

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

Can I rate-limit prepare_voucher_execution_instructions? +

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

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

prepare_voucher_execution_instructions is provided by the Cartesi Knowledge MCP Server MCP server (mugen-builders/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.