get_top_gainers

THE RISK

Low Risk

Why get_top_gainers needs a policy

This is a straightforward data retrieval tool that queries and returns market statistics. It has no side effects, cannot modify or delete data, cannot execute code or commands, and involves no financial transactions. The worst-case misuse is returning outdated or incorrect market information, which has minimal blast radius for an AI agent. Classified as Read with low severity.

From the tool's definition Tool retrieves 'top 10 gaining stocks in the CSE for the current trading day' — a read-only query of market data with no modification, deletion, or execution capabilities.

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

POLICY

How to control get_top_gainers

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

policy.json

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

get_top_gainers 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 CSE MCP Server — 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 get_top_gainers

What does the get_top_gainers tool do? +

Get the top 10 gaining stocks in the CSE for the current trading day. It is categorised as a Read tool in the CSE MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_top_gainers? +

Register the CSE MCP Server MCP server in PolicyLayer and add a rule for get_top_gainers: 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 CSE MCP Server. Nothing to install.

What risk level is get_top_gainers? +

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

Can I rate-limit get_top_gainers? +

Yes. Add a rate_limit block to the get_top_gainers 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 get_top_gainers completely? +

Set action: deny in the PolicyLayer policy for get_top_gainers. 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 get_top_gainers? +

get_top_gainers is provided by the CSE MCP Server MCP server (shaveen12/cse-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every CSE MCP Server tool call.

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

CHECK YOUR STACK →