AI agents call get_fear_greed_index to retrieve information from Coin without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The Fear & Greed Index is a well-known, publicly available cryptocurrency market sentiment indicator. Retrieval of such data produces no side effects, data modifications, or external state changes. Even if misused by an agent, the worst outcome is receiving or acting on market sentiment information—a low-risk scenario.
From the tool's definition Tool name 'get_fear_greed_index' indicates retrieval of the Fear & Greed Index, a market sentiment metric.
Attacks that exploit this kind of access
get_fear_greed_index. It is categorised as a Read tool in the Coin MCP Server, which means it retrieves data without modifying state.
Register the Coin 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 Coin. 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 Coin MCP server (sweetcornna/coin-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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