modify_order · XBTFX MCP Trading Server MCP: Risk & Policy

WHAT IT DOES

What modify_order does on XBTFX MCP Trading Server

AI agents use modify_order 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 modify_order needs a policy

This tool modifies pending orders in a forex/crypto trading system. While the action is reversible (the order can be modified again or cancelled), it materially changes trading parameters (price, stop-loss, take-profit, volume, expiration) and could result in significant financial exposure or unintended trade executions if an AI agent misuses it.

From the tool's definition Tool description states it "Modify a pending order by ticket — change price, SL, TP, volume, and/or expiration." Modifying order parameters is a reversible write operation that alters existing financial orders.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

modify_order Rate-limited

modify_order 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": {
    "modify_order": {
      "limits": [
        {
          "counter": "modify_order_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 modify_order

What does the modify_order tool do? +

Modify a pending order by ticket — change price, SL, TP, volume, and/or expiration. Only the fields you pass change. Use get_orders to find the ticket. Returns 404 if the ticket isn. 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 modify_order? +

Register the XBTFX MCP Trading Server MCP server in PolicyLayer and add a rule for modify_order: 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 modify_order? +

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

Can I rate-limit modify_order? +

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

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

modify_order 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.