buy_limit

A financial tool on the MCP Trader MCP server.

SERVERMCP Trader Server SOURCEaf7007/mcp-trader

Critical RISK CLASS

Category Financial

Parameters 00 required

Recommended Approval-gatedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/af7007-mcp-trader/buy-limit.md

WHAT IT DOES

What buy_limit does on MCP Trader Server

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

RISK

Why buy_limit is rated Critical

A 'buy_limit' order is a standard financial trading instruction that places a pending buy order at a specified price or better. Despite the empty description, the server context and sibling tools make it unambiguous that this tool commits financial obligations by placing limit orders in a trading platform. Misuse could result in significant financial losses.

From the tool's definition Tool name 'buy_limit' on a server described as enabling 'trading operations' and 'automated trade execution' through MetaTrader 5; sibling tools include 'buy_market', 'buy_stop', 'close_position', 'cancel_order' — all clearly financial trading operations.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs buy_limit safely

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

buy_limit Approval-gated

Any call to buy_limit 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_limit": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

GATE THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect MCP Trader Server, apply this rule, and every buy_limit call is checked against it from then on.

FAQ

Questions about buy_limit

What does the buy_limit tool do? +

buy_limit is a financial tool on the MCP Trader Server MCP server. It is categorised as a Financial tool in the MCP Trader Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on buy_limit? +

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

What risk level is buy_limit? +

buy_limit 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_limit? +

Yes. Add a rate_limit block to the buy_limit 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_limit completely? +

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

buy_limit is provided by the MCP Trader Server MCP server (af7007/mcp-trader). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on MCP Trader Server, and thousands of servers like it.

This server

All 45 MCP Trader Server tools → Critical-risk tools on this server →

Across the catalogue

place_limit_order on Lighter MCP →buy_now on Ebay → All critical-risk MCP tools → The MCP Attack Database →

Guides

Govern MCP payment tools →Human-in-the-loop →Tool call approval →