AI agents call check_auth_status to retrieve information from Fyers MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool merely checks and returns the authentication status—a read-only operation with no side effects. It does not modify user data, execute trades, move money, or delete anything. The blast radius of misuse is minimal; an attacker could only learn whether a session is authenticated.
From the tool's definition Tool name 'check_auth_status' and description 'Check current authentication status' indicate a query operation that retrieves information about the current authentication state without modifying any data or executing transactions.
Documented attack patterns abuse exactly the kind of access check_auth_status gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Fyers MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for check_auth_status:
{
"version": "1",
"default": "deny",
"tools": {
"check_auth_status": {}
}
}check_auth_status is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check current authentication status. It is categorised as a Read tool in the Fyers MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Fyers MCP Server MCP server in PolicyLayer and add a rule for check_auth_status: 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 Fyers MCP Server. Nothing to install.
check_auth_status 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 check_auth_status 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 check_auth_status. 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.
check_auth_status is provided by the Fyers MCP Server MCP server (quantabox/fyers-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Fyers 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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11 Fyers MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.