AI agents call get_holdings 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 is a read-only operation that queries existing portfolio data. It does not create, modify, delete, or execute any actions. The blast radius of misuse is minimal—an attacker could view sensitive financial portfolio information but cannot perform transactions, modify positions, or cause financial harm through this tool alone.
From the tool's definition Tool name 'get_holdings' and description 'Get portfolio holdings' indicate data retrieval with no modification. Retrieves portfolio information without side effects.
Documented attack patterns abuse exactly the kind of access get_holdings 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_holdings:
{
"version": "1",
"default": "deny",
"tools": {
"get_holdings": {}
}
}get_holdings is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get portfolio holdings. 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_holdings: 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_holdings 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_holdings 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_holdings. 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_holdings 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.