Query CNN Fear & Greed Index (composite of 7 market signals).
AI agents call get_fear_greed_index to retrieve information from Digital Oracle 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 pre-computed financial sentiment data (the CNN Fear & Greed Index) and returns it to the user. It is a non-destructive, read-only query with no side effects. Even if misused by an agent, the worst outcome would be accessing or reasoning with publicly available market sentiment data, posing negligible risk. No data is written, deleted, executed, or financial transactions are performed.
From the tool's definition Tool name 'get_fear_greed_index' and description 'Query CNN Fear & Greed Index' indicate a read-only retrieval operation that queries and returns market sentiment data without any modification, creation, deletion, or execution of external operations.
Attacks that exploit this kind of access
Query CNN Fear & Greed Index (composite of 7 market signals). It is categorised as a Read tool in the Digital Oracle MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Digital Oracle 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 Digital Oracle 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 Digital Oracle MCP Server MCP server (mzxsuperman/digital-oracle-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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