Get monthly time series data for a cryptocurrency
AI agents call get-crypto-monthly to retrieve information from Stocks 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 and queries cryptocurrency time series data without creating, modifying, deleting, or executing any side effects. While it accesses financial market data, it does not move money, commit financial obligations, or perform any destructive or executable operations. It is purely informational, making it a Read category tool with low severity risk.
From the tool's definition The tool name 'get-crypto-monthly' and description 'Get monthly time series data for a cryptocurrency' indicate a retrieval operation.
Attacks that exploit this kind of access
Get monthly time series data for a cryptocurrency. It is categorised as a Read tool in the Stocks MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Stocks MCP Server MCP server in PolicyLayer and add a rule for get-crypto-monthly: 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 Stocks MCP Server. Nothing to install.
get-crypto-monthly 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-crypto-monthly 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-crypto-monthly. 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-crypto-monthly is provided by the Stocks MCP Server MCP server (maharshi2708/stocks_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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