hl_close_position

THE RISK

Critical Risk

Why hl_close_position needs a policy

Closing a perpetual futures position on Hyperliquid is a financial operation that executes a trade on a derivatives exchange, realizing gains or losses and releasing collateral. This directly involves financial transactions in crypto markets. Misuse could result in significant financial loss due to forced position closure at unfavorable prices or unintended liquidation triggers.

From the tool's definition Close a perpetual position on Hyperliquid (full or partial close)

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

POLICY

How to control hl_close_position

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_close_position:

policy.json

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

Any call to hl_close_position 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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FAQ

Questions about hl_close_position

What does the hl_close_position tool do? +

Close a perpetual position on Hyperliquid (full or partial close). 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_close_position? +

Register the Waiaas MCP server in PolicyLayer and add a rule for hl_close_position: 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_close_position? +

hl_close_position 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_close_position? +

Yes. Add a rate_limit block to the hl_close_position 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_close_position completely? +

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

hl_close_position 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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