login · MetaTrader 5 MCP Server MCP: Risk & Policy

Q: What risk level is login?

login is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

WHAT IT DOES

What login does on MetaTrader 5 MCP Server

AI agents invoke login to trigger actions in MetaTrader 5 MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why login needs a policy

Login establishes an authenticated session to a live financial trading platform (MetaTrader 5). While it doesn't directly move money, it is a prerequisite for all financial operations and constitutes an external operation with significant implications. It falls under Execute because it triggers an external authentication process.

From the tool's definition 'Log in to the MetaTrader 5 trading account' — triggers an authentication/session operation against a live financial trading platform

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

login stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "login": {
      "limits": [
        {
          "counter": "login_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches MetaTrader 5 MCP Server, so you can run agents against it safely.

FAQ

Questions about login

What does the login tool do? +

Log in to the MetaTrader 5 trading account. It is categorised as a Execute tool in the MetaTrader 5 MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on login? +

Register the MetaTrader 5 MCP Server MCP server in PolicyLayer and add a rule for login: 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 MetaTrader 5 MCP Server. Nothing to install.

What risk level is login? +

Can I rate-limit login? +

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

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

login is provided by the MetaTrader 5 MCP Server MCP server (sameerasulakshana/mcpmt5). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.