AI agents call keyInfo to retrieve information from CoinMarketCap MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and reports existing data (API key details and usage statistics) with no side effects. It is a straightforward read operation. While API key information could theoretically be sensitive, the tool itself performs only data retrieval without capability to modify credentials, execute operations, or affect financial transactions.
From the tool's definition Tool name 'keyInfo' and description 'Returns API key details and usage stats' indicate a query operation that retrieves information about API key metadata and usage statistics without modifying, executing, or deleting anything.
Documented attack patterns abuse exactly the kind of access keyInfo gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CoinMarketCap MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for keyInfo:
{
"version": "1",
"default": "deny",
"tools": {
"keyInfo": {}
}
}keyInfo is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Returns API key details and usage stats. It is categorised as a Read tool in the CoinMarketCap MCP MCP Server, which means it retrieves data without modifying state.
Register the CoinMarketCap MCP server in PolicyLayer and add a rule for keyInfo: 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. Nothing to install.
keyInfo 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 keyInfo 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 keyInfo. 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.
keyInfo is provided by the CoinMarketCap MCP server (shinzo-labs/coinmarketcap-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 51 CoinMarketCap MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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51 CoinMarketCap MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.