modify_order · Hyperliquid MCP: Risk & Policy

WHAT IT DOES

What modify_order does on Hyperliquid

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

WHY IT NEEDS A POLICY

Why modify_order needs a policy

This tool modifies financial orders reversibly (orders can be cancelled or replaced with new orders). While it operates in a financial context, the modification itself is not a financial transaction that moves money directly—it adjusts order parameters. However, given the context of a decentralized exchange where order modifications affect trading positions and market exposure, this warrants high severity.

From the tool's definition Tool modifies an existing order on a financial exchange (Hyperliquid). Description states 'Modify an existing order' which is a reversible state change to a trading position.

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 Hyperliquid, so you can run agents against it safely.

FAQ

Questions about modify_order

What does the modify_order tool do? +

Modify an existing order on Hyperliquid exchange. It is categorised as a Write tool in the Hyperliquid 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 Hyperliquid 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 Hyperliquid. 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 Hyperliquid MCP server (midodimori/hyperliquid-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.