buy_order · Basis MCP Server MCP: Risk & Policy

WHAT IT DOES

What buy_order does on Basis MCP Server

AI agents use buy_order to commit financial operations through Basis MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why buy_order needs a policy

Filling an order on a trading order book directly moves cryptocurrency/tokens between parties, constituting a financial transaction. Misuse could result in unintended trades and loss of funds, warranting critical severity.

From the tool's definition "Fill a single order on the order book" — this executes a trade/purchase on a financial order book, committing funds on BNB Smart Chain.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

buy_order Approval-gated

Any call to buy_order is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "buy_order": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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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 Basis MCP Server, so you can run agents against it safely.

FAQ

Questions about buy_order

What does the buy_order tool do? +

Fill a single order on the order book. It is categorised as a Financial tool in the Basis MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on buy_order? +

Register the Basis MCP Server MCP server in PolicyLayer and add a rule for buy_order: 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 Basis MCP Server. Nothing to install.

What risk level is buy_order? +

buy_order is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit buy_order? +

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

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

buy_order is provided by the Basis MCP Server MCP server (launch-on-basis/mcp-ts). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.