Queries the price for a given pair and round ID on a specified chain (placeholder due to historical data limitations)
AI agents call queryPriceByRound to retrieve information from Chainlink Feeds without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical price data by querying a specified pair and round ID on a blockchain. It performs no writes, modifications, deletions, code execution, or financial transactions. The impact is limited to reading existing on-chain price information, making it a low-severity Read operation suitable for informational purposes in AI agent decision-making.
From the tool's definition Tool description states it 'Queries the price' which is a retrieval operation. The method name 'queryPriceByRound' and verb 'Queries' indicate data retrieval with no modification.
Documented attack patterns abuse exactly the kind of access queryPriceByRound gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Chainlink Feeds, and nothing reaches the server without passing your rules. This is the rule we recommend for queryPriceByRound:
{
"version": "1",
"default": "deny",
"tools": {
"queryPriceByRound": {}
}
}queryPriceByRound is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Queries the price for a given pair and round ID on a specified chain (placeholder due to historical data limitations). It is categorised as a Read tool in the Chainlink Feeds MCP Server, which means it retrieves data without modifying state.
Register the Chainlink Feeds MCP server in PolicyLayer and add a rule for queryPriceByRound: 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 Chainlink Feeds. Nothing to install.
queryPriceByRound 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 queryPriceByRound 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 queryPriceByRound. 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.
queryPriceByRound is provided by the Chainlink Feeds MCP server (kukapay/chainlink-feeds-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Chainlink Feeds, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
5 Chainlink Feeds tools catalogued and risk-classified — across an index of 43,000+ MCP servers.