Subscribe to order updates and user fills.
AI agents call subscribe_order_updates to retrieve information from Hyperliquid MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries order and fill state from the decentralized exchange and streams updates to the client. It has no side effects—it does not create, modify, delete, or trigger trades. While the parent server as a whole can execute financial operations, this specific tool is read-only data retrieval with low blast radius if misused by an AI agent (worst case: exposure of the user's order history and current fills).
From the tool's definition Tool name 'subscribe_order_updates' and description 'Subscribe to order updates and user fills' indicate the tool retrieves or queries live order status and fill information.
Attacks that exploit this kind of access
Subscribe to order updates and user fills. It is categorised as a Read tool in the Hyperliquid MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Hyperliquid MCP Server MCP server in PolicyLayer and add a rule for subscribe_order_updates: 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.
subscribe_order_updates is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the subscribe_order_updates 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 subscribe_order_updates. 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.
subscribe_order_updates 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.
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