AI agents call get_stock_price to retrieve information from IBKR-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 straightforward data retrieval operation that queries market prices. It has no side effects, cannot modify data, and cannot execute commands or move money. The blast radius of misuse is minimal—an agent could retrieve prices for any stock but cannot execute trades, delete data, or cause financial harm through price queries alone.
From the tool's definition Tool retrieves current stock price and market data with no modification capability. Name indicates 'get' operation. Server context shows 'retrieve portfolio, account information, and real-time market prices' confirming read-only data retrieval.
Documented attack patterns abuse exactly the kind of access get_stock_price gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and IBKR-MCP-Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_stock_price:
{
"version": "1",
"default": "deny",
"tools": {
"get_stock_price": {}
}
}get_stock_price is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get current stock price and market data. It is categorised as a Read tool in the IBKR-MCP-Server MCP Server, which means it retrieves data without modifying state.
Register the IBKR-MCP-Server MCP server in PolicyLayer and add a rule for get_stock_price: 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 IBKR-MCP-Server. Nothing to install.
get_stock_price 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_stock_price 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_stock_price. 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_stock_price is provided by the IBKR-MCP-Server MCP server (xiao81/ibkr-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from IBKR-MCP-Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
5 IBKR-MCP-Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.