AI agents call get_quotes 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 only retrieves live market quotes (pricing data) for stock symbols. It is a read-only operation with no side effects, no financial transactions, and no ability to modify state. It falls squarely under the Read category. Severity is low because quote retrieval cannot harm portfolios or trigger unintended financial actions.
From the tool's definition Tool name is 'get_quotes' and description states 'Get live quotes for symbols' — retrieves market data with no modification or execution of trades.
Documented attack patterns abuse exactly the kind of access get_quotes 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 get_quotes:
{
"version": "1",
"default": "deny",
"tools": {
"get_quotes": {}
}
}get_quotes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get live quotes for symbols. 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 get_quotes: 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.
get_quotes 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_quotes 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_quotes. 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_quotes 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.