hl_set_margin_mode

THE RISK

Critical Risk

Why hl_set_margin_mode needs a policy

Changing margin mode on a perpetuals exchange (Hyperliquid) directly affects how margin is allocated across positions. Switching from Isolated to Cross can expose the entire account balance to liquidation risk, or vice versa. This is a financial configuration change with significant implications for trading positions and potential losses, making it a Financial category tool with high severity.

From the tool's definition Switch between Cross and Isolated margin mode on Hyperliquid

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

POLICY

How to control hl_set_margin_mode

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "hl_set_margin_mode": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to hl_set_margin_mode is blocked until a human approves it. The rest of the server keeps working.

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

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EXPLORE

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Critical-risk tools in Waiaas → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
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Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about hl_set_margin_mode

What does the hl_set_margin_mode tool do? +

Switch between Cross and Isolated margin mode on Hyperliquid. It is categorised as a Financial tool in the Waiaas MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on hl_set_margin_mode? +

Register the Waiaas MCP server in PolicyLayer and add a rule for hl_set_margin_mode: 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 Waiaas. Nothing to install.

What risk level is hl_set_margin_mode? +

hl_set_margin_mode is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit hl_set_margin_mode? +

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

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

hl_set_margin_mode is provided by the Waiaas MCP server (minhoyoo-iotrust/waiaas). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Waiaas tool call.

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

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