Get top winning and losing coins in your portfolio by price change
AI agents call get_biggest_movers 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 and queries portfolio performance data (price movements of holdings) without creating, modifying, deleting, or executing any operations. It is a pure data retrieval operation fitting the Read category with minimal risk—misuse would only expose what holdings the user already possesses and their performance metrics.
From the tool's definition Tool name 'get_biggest_movers' and description 'Get top winning and losing coins in your portfolio by price change' indicate retrieval of portfolio analytics data with no modification capability.
Attacks that exploit this kind of access
Get top winning and losing coins in your portfolio by price change. 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_biggest_movers: 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_biggest_movers 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_biggest_movers 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_biggest_movers. 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_biggest_movers 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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