Get mapping of all cryptocurrencies to CoinMarketCap IDs
AI agents call get-cryptocurrency-map to retrieve information from CoinMarketCap MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that queries cryptocurrency metadata. It retrieves and returns mapping information without creating, modifying, deleting, or executing any operations. The blast radius of misuse is minimal—an AI agent could only obtain cryptocurrency reference data. No financial transactions, code execution, or data modification is possible.
From the tool's definition Tool retrieves cryptocurrency mapping data without modification. Description states 'Get mapping of all cryptocurrencies to CoinMarketCap IDs' - a query operation that returns reference data with no side effects.
Attacks that exploit this kind of access
Get mapping of all cryptocurrencies to CoinMarketCap IDs. It is categorised as a Read tool in the CoinMarketCap MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CoinMarketCap MCP Server MCP server in PolicyLayer and add a rule for get-cryptocurrency-map: 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 CoinMarketCap MCP Server. Nothing to install.
get-cryptocurrency-map 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-cryptocurrency-map 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-cryptocurrency-map. 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-cryptocurrency-map is provided by the CoinMarketCap MCP Server MCP server (szcharlesji/crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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