Query all sub-accounts of the master account with pagination support. Use master account
AI agents call querySubMembersV5 to retrieve information from Bybit MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and lists sub-account information from the master account, which is a read-only operation. However, severity is elevated to medium (rather than low) because sub-account details can be sensitive financial information that could be misused for reconnaissance, account manipulation, or social engineering if exposed to an unauthorized agent.
From the tool's definition Query all sub-accounts of the master account with pagination support. The verb 'Query' and 'pagination support' indicate data retrieval with no modification capability.
Documented attack patterns abuse exactly the kind of access querySubMembersV5 gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Bybit MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for querySubMembersV5:
{
"version": "1",
"default": "deny",
"tools": {
"querySubMembersV5": {}
}
}querySubMembersV5 is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Query all sub-accounts of the master account with pagination support. Use master account. It is categorised as a Read tool in the Bybit MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Bybit MCP Server MCP server in PolicyLayer and add a rule for querySubMembersV5: 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 Bybit MCP Server. Nothing to install.
querySubMembersV5 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 querySubMembersV5 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 querySubMembersV5. 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.
querySubMembersV5 is provided by the Bybit MCP Server MCP server (bybit-exchange/trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Bybit MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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326 Bybit MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.