find_best_to_buy

THE RISK

Low Risk

Why find_best_to_buy needs a policy

The tool reads technical indicators and screens for option candidates to buy. It does not execute trades or move money — it generates a recommendation. However, it borders on Financial due to the explicit 'BUY' framing and trading context.

From the tool's definition 'Auto-find the best directional option to BUY. Reads technicals' — the tool reads/analyzes technical data to identify options candidates

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

POLICY

How to control find_best_to_buy

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

policy.json

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

find_best_to_buy 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 Momentum — 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

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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 find_best_to_buy

What does the find_best_to_buy tool do? +

Auto-find the best directional option to BUY. Reads technicals. It is categorised as a Read tool in the Momentum MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on find_best_to_buy? +

Register the Momentum MCP server in PolicyLayer and add a rule for find_best_to_buy: 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 Momentum. Nothing to install.

What risk level is find_best_to_buy? +

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

Can I rate-limit find_best_to_buy? +

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

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

find_best_to_buy is provided by the Momentum MCP server (mphinance/momentum-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Momentum tool call.

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

CHECK YOUR STACK →