modify_position_margin

THE RISK

Medium Risk

Why modify_position_margin needs a policy

This tool modifies margin allocation for a trading position, which is a reversible write operation affecting financial risk exposure. While it moves funds within margin accounts, it does not directly execute trades or move money externally. However, reducing margin can increase liquidation risk significantly, making misuse high-severity.

From the tool's definition Manually add or reduce margin for an isolated margin position. Use positive values to add margin (reduce liquidation risk) or negative values to reduce margin.

Documented attack patterns abuse exactly the kind of access modify_position_margin gives an agent:

POLICY

How to control modify_position_margin

PolicyLayer is an MCP gateway — it sits between your AI agents and Bybit MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for modify_position_margin:

policy.json

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

modify_position_margin 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.

Create a free account and register Bybit MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
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PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about modify_position_margin

What does the modify_position_margin tool do? +

Manually add or reduce margin for an isolated margin position. Use positive values to add margin (reduce liquidation risk) or negative values to reduce margin. It is categorised as a Write tool in the Bybit MCP 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_position_margin? +

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

What risk level is modify_position_margin? +

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

Can I rate-limit modify_position_margin? +

Yes. Add a rate_limit block to the modify_position_margin 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_position_margin completely? +

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

modify_position_margin is provided by the Bybit MCP Server MCP server (bcusack/bybit-py-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Bybit MCP Server tool call.

Start from Bybit MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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