tm_prepare_transfer · Truemarkets MCP: Risk & Policy

WHAT IT DOES

What tm_prepare_transfer does on Truemarkets

AI agents use tm_prepare_transfer to create or update resources in Truemarkets — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Truemarkets environment.

WHY IT NEEDS A POLICY

Why tm_prepare_transfer needs a policy

This tool prepares (stages) a transfer of tokens to an external wallet, creating a transfer_id that can be executed later. It does not yet move funds — that happens via tm_execute_transfer — so it is not yet Financial. However, preparing a transfer involves creating a pending financial commitment and is a necessary precursor to fund movement.

From the tool's definition Prepare a transfer to an external wallet address. Returns transfer details and a transfer_id for execution with tm_execute_transfer.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tm_prepare_transfer Rate-limited

tm_prepare_transfer stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "tm_prepare_transfer": {
      "limits": [
        {
          "counter": "tm_prepare_transfer_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 Truemarkets, so you can run agents against it safely.

FAQ

Questions about tm_prepare_transfer

What does the tm_prepare_transfer tool do? +

Prepare a transfer to an external wallet address. Returns transfer details and a transfer_id for execution with tm_execute_transfer. Args: - to (string): Destination wallet address - token (string): Token symbol or contract address - amount (string): Quantity as decimal string - chain (. It is categorised as a Write tool in the Truemarkets MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tm_prepare_transfer? +

Register the Truemarkets MCP server in PolicyLayer and add a rule for tm_prepare_transfer: 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 Truemarkets. Nothing to install.

What risk level is tm_prepare_transfer? +

tm_prepare_transfer is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit tm_prepare_transfer? +

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

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

tm_prepare_transfer is provided by the Truemarkets MCP server (jun229/tm-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.