get_sector_flow

THE RISK

Low Risk

Why get_sector_flow needs a policy

This tool queries and returns financial market data (options flow sentiment by sector) for analysis purposes. There are no side effects, no data modification, no execution of trades, and no financial transactions initiated. It is purely informational, supporting the stated purpose of stock screening and analysis.

From the tool's definition Tool name 'get_sector_flow' and description 'Sector-by-sector options flow with bullish/bearish sentiment' indicate data retrieval only.

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

POLICY

How to control get_sector_flow

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 get_sector_flow:

policy.json

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

get_sector_flow 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 get_sector_flow

What does the get_sector_flow tool do? +

Sector-by-sector options flow with bullish/bearish sentiment. 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 get_sector_flow? +

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

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

Can I rate-limit get_sector_flow? +

Yes. Add a rate_limit block to the get_sector_flow 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_sector_flow completely? +

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

get_sector_flow 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 →