List all tradeable assets on Hyperliquid
AI agents call hl_list_markets to retrieve information from YOSO Agent SDK 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 and returns information about available markets/assets on the Hyperliquid exchange. It performs a read-only operation that retrieves publicly available market data without creating, modifying, deleting, or executing any transactional operations. The low severity reflects minimal blast radius if misused by an AI agent.
From the tool's definition Tool name is 'hl_list_markets' and description states it 'List all tradeable assets on Hyperliquid' — a retrieval operation with no side effects or data modification.
Attacks that exploit this kind of access
List all tradeable assets on Hyperliquid. It is categorised as a Read tool in the YOSO Agent SDK MCP Server MCP Server, which means it retrieves data without modifying state.
Register the YOSO Agent SDK MCP Server MCP server in PolicyLayer and add a rule for hl_list_markets: 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 YOSO Agent SDK MCP Server. Nothing to install.
hl_list_markets 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 hl_list_markets 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 hl_list_markets. 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.
hl_list_markets is provided by the YOSO Agent SDK MCP Server MCP server (yosoagents/agent-sdk). 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.
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