Get current crypto market fear & greed index (0-100)
AI agents call get_fear_greed_index to retrieve information from Crypto Portfolio MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves publicly available market sentiment data (the Fear & Greed Index). It queries external data without creating, modifying, deleting, or executing operations. Misuse by an AI agent would at worst result in acting on stale or misinterpreted sentiment data, with no irreversible consequences or financial impact beyond the agent's own decision-making.
From the tool's definition Tool name 'get_fear_greed_index' and description 'Get current crypto market fear & greed index' indicate a retrieval operation. The server is explicitly described as 'read-only portfolio management and analytics'.
Attacks that exploit this kind of access
Get current crypto market fear & greed index (0-100). It is categorised as a Read tool in the Crypto Portfolio MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Crypto Portfolio MCP Server MCP server in PolicyLayer and add a rule for get_fear_greed_index: 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 Portfolio MCP Server. Nothing to install.
get_fear_greed_index 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 get_fear_greed_index 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 get_fear_greed_index. 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.
get_fear_greed_index is provided by the Crypto Portfolio MCP Server MCP server (lev-corrupted/cryptoportfoliomcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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