AI agents call get_perp_metadata to retrieve information from Hyperliquid Info without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool name 'get_perp_metadata' follows the standard 'get_*' pattern which universally indicates read-only data retrieval with no side effects. Although the description is empty, the naming convention combined with the context of similar metadata/snapshot retrieval tools on the Hyperliquid exchange info server indicates this retrieves perpetual futures metadata.
From the tool's definition Tool name is 'get_perp_metadata' with no description provided. Context from sibling tools (get_all_mids, get_candles_snapshot, get_coin_funding_history, get_l2_snapshot, get_spot_metadata, get_user_fees, get_user_funding_history, get_user_open_orders,…
Documented attack patterns abuse exactly the kind of access get_perp_metadata gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Hyperliquid Info, and nothing reaches the server without passing your rules. This is the rule we recommend for get_perp_metadata:
{
"version": "1",
"default": "deny",
"tools": {
"get_perp_metadata": {}
}
}get_perp_metadata is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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get_perp_metadata. It is categorised as a Read tool in the Hyperliquid Info MCP Server, which means it retrieves data without modifying state.
Register the Hyperliquid Info MCP server in PolicyLayer and add a rule for get_perp_metadata: 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 Info. Nothing to install.
get_perp_metadata 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 get_perp_metadata 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 get_perp_metadata. 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.
get_perp_metadata is provided by the Hyperliquid Info MCP server (kukapay/hyperliquid-info-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Hyperliquid Info, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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17 Hyperliquid Info tools catalogued and risk-classified — across an index of 43,000+ MCP servers.