close_symbol · XBTFX MCP Trading Server MCP: Risk & Policy

WHAT IT DOES

What close_symbol does on XBTFX MCP Trading Server

AI agents use close_symbol to create or update resources in XBTFX MCP Trading Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your XBTFX MCP Trading Server environment.

WHY IT NEEDS A POLICY

Why close_symbol needs a policy

An AI agent can call close_symbol faster than any human can review — one bad instruction and it creates or modifies resources in XBTFX MCP Trading Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

close_symbol Rate-limited

close_symbol stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "close_symbol": {
      "limits": [
        {
          "counter": "close_symbol_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about close_symbol

What does the close_symbol tool do? +

Close all positions for a specific symbol. Destructive — confirm with user first. Costs 10 weight. It is categorised as a Write tool in the XBTFX MCP Trading Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on close_symbol? +

Register the XBTFX MCP Trading Server MCP server in PolicyLayer and add a rule for close_symbol: 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 XBTFX MCP Trading Server. Nothing to install.

What risk level is close_symbol? +

close_symbol is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit close_symbol? +

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

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

close_symbol is provided by the XBTFX MCP Trading Server MCP server (xbtfx/xbtfx-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.