top_100_stocks

THE RISK

Low Risk

Why top_100_stocks needs a policy

This tool retrieves publicly available market data (popular stock rankings) from Robinhood without executing trades, modifying accounts, or triggering financial transactions. It is purely informational and read-only, presenting no risk of unintended financial consequences or data modification if called by an AI agent.

From the tool's definition Tool name 'top_100_stocks' and description 'Gets top 100 most popular stocks on Robinhood' indicate a data retrieval operation with no modification or execution of trades.

Documented attack patterns abuse exactly the kind of access top_100_stocks gives an agent:

POLICY

How to control top_100_stocks

PolicyLayer is an MCP gateway — it sits between your AI agents and Open Stocks MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for top_100_stocks:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "top_100_stocks": {}
  }
}

top_100_stocks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Open Stocks MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about top_100_stocks

What does the top_100_stocks tool do? +

Gets top 100 most popular stocks on Robinhood. It is categorised as a Read tool in the Open Stocks MCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on top_100_stocks? +

Register the Open Stocks MCP server in PolicyLayer and add a rule for top_100_stocks: 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 Stocks MCP. Nothing to install.

What risk level is top_100_stocks? +

top_100_stocks is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit top_100_stocks? +

Yes. Add a rate_limit block to the top_100_stocks 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.

How do I block top_100_stocks completely? +

Set action: deny in the PolicyLayer policy for top_100_stocks. 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.

What MCP server provides top_100_stocks? +

top_100_stocks is provided by the Open Stocks MCP server (open-agent-tools/open-stocks-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Open Stocks MCP tool call.

Start from Open Stocks MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →