AI agents call get_companies_holdings 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.
This tool retrieves cryptocurrency company holding information without modifying or executing operations. While the description is empty, the naming pattern and server context (market-data queries) strongly suggest read-only behavior.
From the tool's definition Tool name 'get_companies_holdings' indicates data retrieval; sibling tools (get_coin_details, get_coin_tickers, cache_stats) are all Read operations. Server is explicitly described as 'market-data MCP server' for querying.
Attacks that exploit this kind of access
get_companies_holdings. 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 get_companies_holdings: 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.
get_companies_holdings 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_companies_holdings 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_companies_holdings. 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_companies_holdings 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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