find_best_to_sell

THE RISK

Critical Risk

Why find_best_to_sell needs a policy

Selling options (puts and calls) is a financial operation that creates real financial obligations and risk exposure. Selling puts obligates the seller to buy shares at the strike price; selling calls obligates delivery of shares. Even if this tool only generates recommendations rather than executing trades, the description implies automated identification and initiation of sell orders in options markets.

From the tool's definition 'Auto-find the best puts and calls to SELL' — directly involves selling options contracts, which constitutes committing financial obligations in derivatives markets

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

POLICY

How to control find_best_to_sell

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_sell:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "find_best_to_sell": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to find_best_to_sell is blocked until a human approves it. The rest of the server keeps working.

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.

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EXPLORE

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Critical-risk tools in Momentum → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
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FAQ

Questions about find_best_to_sell

What does the find_best_to_sell tool do? +

Auto-find the best puts and calls to SELL. Scans 7-45 DTE across. It is categorised as a Financial tool in the Momentum MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on find_best_to_sell? +

Register the Momentum MCP server in PolicyLayer and add a rule for find_best_to_sell: 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_sell? +

find_best_to_sell is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit find_best_to_sell? +

Yes. Add a rate_limit block to the find_best_to_sell 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_sell completely? +

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

find_best_to_sell 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.

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