Screen for stocks forming a Volatility Contraction Pattern (VCP).
AI agents call screen_vcp to retrieve information from Momentum without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and filters stock data based on technical criteria, returning matching results. It does not execute trades, modify data, delete records, or trigger external operations. Despite being on a trading server, screening is purely analytical and read-only. No financial transactions occur, no code execution happens, and no data is altered.
From the tool's definition Tool name 'screen_vcp' and description indicate it screens for stocks matching a technical pattern (Volatility Contraction Pattern). The verb 'screen' and action of pattern-matching constitute data retrieval with no modification or execution of trades.
Documented attack patterns abuse exactly the kind of access screen_vcp gives an agent:
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 screen_vcp:
{
"version": "1",
"default": "deny",
"tools": {
"screen_vcp": {}
}
}screen_vcp is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Screen for stocks forming a Volatility Contraction Pattern (VCP). It is categorised as a Read tool in the Momentum MCP Server, which means it retrieves data without modifying state.
Register the Momentum MCP server in PolicyLayer and add a rule for screen_vcp: 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.
screen_vcp is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the screen_vcp 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.
Set action: deny in the PolicyLayer policy for screen_vcp. 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.
screen_vcp 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.
Start from Momentum, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
52 Momentum tools catalogued and risk-classified — across an index of 43,000+ MCP servers.