AI agents use close_position to commit financial operations through MCP MetaTrader 4 Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
Closing a trading position is a financial action that realizes profits or losses, modifies financial exposure, and cannot be undone once executed. This directly commits financial consequences and is irreversible in market terms, placing it in the Financial category with critical severity given the potential for significant monetary impact if misused.
From the tool's definition 'close_position' - 'Close an open position' on a MetaTrader 4 trading platform that handles 'order execution'
Documented attack patterns abuse exactly the kind of access close_position gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP MetaTrader 4 Server, and nothing reaches the server without passing your rules. This is the rule we recommend for close_position:
{
"version": "1",
"default": "deny",
"tools": {
"close_position": {
"deny_if": [
{
"conditions": [],
"on_deny": "Requires human approval."
}
]
}
}
}Any call to close_position is blocked until a human approves it. The rest of the server keeps working.
Free to start. No card required.
Close an open position. It is categorised as a Financial tool in the MCP MetaTrader 4 Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the MCP MetaTrader 4 Server MCP server in PolicyLayer and add a rule for close_position: 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 MetaTrader 4 Server. Nothing to install.
close_position is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the close_position 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.
Set action: deny in the PolicyLayer policy for close_position. 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.
close_position is provided by the MCP MetaTrader 4 Server MCP server (8nite/metatrader-4-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP MetaTrader 4 Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
14 MCP MetaTrader 4 Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.