buy_stop

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-stop.md

WHAT IT DOES

What buy_stop does on MCP Trader Server

AI agents use buy_stop 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_stop is rated Critical

A 'buy_stop' is a standard order type in trading (MetaTrader 5 context confirmed by server description) that places a pending buy order above the current market price, triggering an automated purchase when price reaches the specified level. This commits financial obligations and executes real trades.

From the tool's definition Tool name 'buy_stop' on a server that 'Supports real-time market data, automated trade execution'; sibling tools include buy_limit, buy_market, close_position — all financial trading operations

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs buy_stop 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_stop, this is the rule to start with:

buy_stop Approval-gated

Any call to buy_stop 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_stop": {
      "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_stop call is checked against it from then on.

FAQ

Questions about buy_stop

What does the buy_stop tool do? +

buy_stop 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_stop? +

Register the MCP Trader Server MCP server in PolicyLayer and add a rule for buy_stop: 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_stop? +

buy_stop 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_stop? +

Yes. Add a rate_limit block to the buy_stop 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_stop completely? +

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

buy_stop 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_stop_loss 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 →