Search for stocks by symbol or company name
AI agents call search_stocks_tool to retrieve information from Open Paper Trading MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries stock data based on search criteria (symbol or company name). It performs a lookup operation without creating, modifying, deleting, or executing any trades or code. Search operations are non-destructive reads that return information to the user without altering any state in the trading system.
From the tool's definition Tool name 'search_stocks_tool' and description 'Search for stocks by symbol or company name' indicate a query/retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access search_stocks_tool gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Open Paper Trading MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for search_stocks_tool:
{
"version": "1",
"default": "deny",
"tools": {
"search_stocks_tool": {}
}
}search_stocks_tool is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search for stocks by symbol or company name. It is categorised as a Read tool in the Open Paper Trading MCP MCP Server, which means it retrieves data without modifying state.
Register the Open Paper Trading MCP server in PolicyLayer and add a rule for search_stocks_tool: 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 Open Paper Trading MCP. Nothing to install.
search_stocks_tool 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 search_stocks_tool 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 search_stocks_tool. 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.
search_stocks_tool is provided by the Open Paper Trading MCP server (open-agent-tools/open-paper-trading-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Open Paper Trading MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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44 Open Paper Trading MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.