modifyEarnPosition

THE RISK

Medium Risk

Why modifyEarnPosition needs a policy

This tool creates or modifies data reversibly by changing the auto-reinvest flag on a position. It does not execute trades, delete positions, or move funds directly—it only adjusts a setting. While it affects earning behavior on the Bybit exchange, the modification can be undone by toggling the setting back. This is characteristic of Write category tools.

From the tool's definition The tool modifies the auto-reinvest setting for a fixed-term OnChain position. The verb 'modify' and 'set/unset' indicate it changes an existing configuration reversibly. It alters position settings without executing trades or deleting data.

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

POLICY

How to control modifyEarnPosition

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 modifyEarnPosition:

policy.json

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

modifyEarnPosition 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

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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about modifyEarnPosition

What does the modifyEarnPosition tool do? +

Set or unset auto-reinvest for a fixed-term OnChain position (. 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 modifyEarnPosition? +

Register the Bybit MCP Server MCP server in PolicyLayer and add a rule for modifyEarnPosition: 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 modifyEarnPosition? +

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

Can I rate-limit modifyEarnPosition? +

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

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

modifyEarnPosition is provided by the Bybit MCP Server MCP server (bybit-exchange/trading-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.

CHECK YOUR STACK →