AI agents call list_top_coins to retrieve information from Coin without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to query and return a list of top coins by some ranking (market cap, volume, etc.), which is a read-only data retrieval operation with no side effects. The 'list' prefix aligns with read-category tools. No reversible modifications, code execution, deletions, or financial transactions are indicated.
From the tool's definition Tool name 'list_top_coins' indicates retrieval of cryptocurrency market data without modification. Empty description limits direct evidence, but sibling tools on this server (get_coin_details, get_coin_tickers, get_aggregated_ohlc) are clearly data retrieval…
Attacks that exploit this kind of access
list_top_coins. It is categorised as a Read tool in the Coin MCP Server, which means it retrieves data without modifying state.
Register the Coin MCP server in PolicyLayer and add a rule for list_top_coins: 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 Coin. Nothing to install.
list_top_coins 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 list_top_coins 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 list_top_coins. 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.
list_top_coins is provided by the Coin MCP server (sweetcornna/coin-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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