mt5_close_all · MT5 MCP Server MCP: Risk & Policy

WHAT IT DOES

What mt5_close_all does on MT5 MCP Server

AI agents use mt5_close_all to commit financial operations through MT5 MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why mt5_close_all needs a policy

This tool closes (liquidates) trading positions in MetaTrader 5, which constitutes a financial transaction. Misuse could result in mass liquidation of all open positions, causing significant financial loss. The ability to close all positions with no symbol filter makes this critical severity.

From the tool's definition 「条件一致ポジションを一括決済する。symbol 省略で全ポジション。」— closes all matching positions; omitting symbol closes ALL positions

Risk signalsBulk/mass operation — affects multiple targets

Attacks that exploit this kind of access

Questions about mt5_close_all

What does the mt5_close_all tool do? +

条件一致ポジションを一括決済する。symbol 省略で全ポジション。. It is categorised as a Financial tool in the MT5 MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on mt5_close_all? +

Register the MT5 MCP Server MCP server in PolicyLayer and add a rule for mt5_close_all: 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 MT5 MCP Server. Nothing to install.

What risk level is mt5_close_all? +

mt5_close_all 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 mt5_close_all? +

Yes. Add a rate_limit block to the mt5_close_all 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 mt5_close_all completely? +

Set action: deny in the PolicyLayer policy for mt5_close_all. 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 mt5_close_all? +

mt5_close_all is provided by the MT5 MCP Server MCP server (junmt/mt5-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.