Generate a candlestick chart with EMA overlays (8/21/34/55/89).
AI agents call generate_chart 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 reads market data and renders a chart visualization with EMA overlays. It produces a read-only output (a chart image/display) with no side effects, data modification, code execution, or financial transactions involved.
From the tool's definition Generate a candlestick chart with EMA overlays (8/21/34/55/89)
Documented attack patterns abuse exactly the kind of access generate_chart 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 generate_chart:
{
"version": "1",
"default": "deny",
"tools": {
"generate_chart": {}
}
}generate_chart is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Generate a candlestick chart with EMA overlays (8/21/34/55/89). 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 generate_chart: 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.
generate_chart 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 generate_chart 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 generate_chart. 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.
generate_chart 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.
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52 Momentum tools catalogued and risk-classified — across an index of 43,000+ MCP servers.