AI agents call analyze_fng_trend to retrieve information from Crypto Feargreed without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to perform analysis on Fear & Greed Index trend data. Analysis and trend computation are read-like operations that retrieve or process existing data without creating, modifying, executing external commands, or destructive actions. The sibling tools (get_current_fng_tool, get_historical_fng_tool) are clearly Read operations, making this tool likely to be a variant read operation.
From the tool's definition Tool name 'analyze_fng_trend' combined with server context providing 'Crypto Fear & Greed Index data' strongly suggests data analysis and retrieval. However, the tool description is empty, which prevents definitive confirmation of the exact action.
Documented attack patterns abuse exactly the kind of access analyze_fng_trend gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Crypto Feargreed, and nothing reaches the server without passing your rules. This is the rule we recommend for analyze_fng_trend:
{
"version": "1",
"default": "deny",
"tools": {
"analyze_fng_trend": {}
}
}analyze_fng_trend is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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analyze_fng_trend. It is categorised as a Read tool in the Crypto Feargreed MCP Server, which means it retrieves data without modifying state.
Register the Crypto Feargreed MCP server in PolicyLayer and add a rule for analyze_fng_trend: 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 Crypto Feargreed. Nothing to install.
analyze_fng_trend 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 analyze_fng_trend 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 analyze_fng_trend. 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.
analyze_fng_trend is provided by the Crypto Feargreed MCP server (kukapay/crypto-feargreed-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Crypto Feargreed, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 Crypto Feargreed tools catalogued and risk-classified — across an index of 43,000+ MCP servers.