Cancel a specific order by order ID or client order ID.
AI agents call cancel_order to permanently remove resources in Hyperliquid MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Cancelling an order on a decentralized exchange is a destructive financial action that irreversibly removes a pending trade instruction. While not directly moving money, it represents a loss-of-opportunity action that cannot be reversed and could cause significant financial harm if triggered maliciously or by mistake (e.g., agent cancels user's carefully-placed limit orders during volatile markets).
From the tool's definition Tool name is 'cancel_order' and description explicitly states it 'Cancel[s] a specific order by order ID or client order ID.' The action is irreversible—once cancelled, a pending order is removed from the exchange and cannot be undone without manual…
Attacks that exploit this kind of access
Cancel a specific order by order ID or client order ID. It is categorised as a Destructive tool in the Hyperliquid MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Hyperliquid MCP Server MCP server in PolicyLayer and add a rule for cancel_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 MCP Server. Nothing to install.
cancel_order is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the cancel_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.
Set action: deny in the PolicyLayer policy for cancel_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.
cancel_order is provided by the Hyperliquid MCP Server MCP server (jhonatanpinheiro/hyperliquid-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
Teams ship this data inside their own products. See what a licence covers →