prepare_erc721_deposit_instructions

WHAT IT DOES

What prepare_erc721_deposit_instructions does on Cartesi Knowledge MCP Server

AI agents invoke prepare_erc721_deposit_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_erc721_deposit_instructions needs a policy

This tool generates and presumably executes host-machine instructions that trigger external blockchain operations including token transfers (transferFrom), approvals (setApprovalForAll), and deposits (depositERC721Token) via the ERC721Portal smart contract. These are on-chain state-changing operations with real asset implications.

From the tool's definition Generate host-machine instructions for depositing one ERC721 token into a Cartesi application via ERC721Portal: ownership/balance checks, optional safeMint (owner key only), transferFrom, setApprovalForAll, and depositERC721Token

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

prepare_erc721_deposit_instructions Rate-limited

prepare_erc721_deposit_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_erc721_deposit_instructions": {
      "limits": [
        {
          "counter": "prepare_erc721_deposit_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_erc721_deposit_instructions

What does the prepare_erc721_deposit_instructions tool do? +

Generate host-machine instructions for depositing one ERC721 token into a Cartesi application via ERC721Portal: ownership/balance checks, optional safeMint (owner key only), transferFrom, setApprovalForAll, and depositERC721Token. Depositor wallet is configurable via depositor_wallet_index, depositor_private_key, and optional depositor_address for read calls. 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_erc721_deposit_instructions? +

Register the Cartesi Knowledge MCP Server MCP server in PolicyLayer and add a rule for prepare_erc721_deposit_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_erc721_deposit_instructions? +

prepare_erc721_deposit_instructions is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit prepare_erc721_deposit_instructions? +

Yes. Add a rate_limit block to the prepare_erc721_deposit_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_erc721_deposit_instructions completely? +

Set action: deny in the PolicyLayer policy for prepare_erc721_deposit_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_erc721_deposit_instructions? +

prepare_erc721_deposit_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.