Returns a comma-separated list of price feed names for a specified blockchain network
AI agents call listSupportedFeedsByChain 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 and lists supported price feeds for a given blockchain network. It has no side effects, does not modify state, and poses minimal security risk if invoked by an AI agent. The worst-case scenario is returning information about available feeds, which is informational in nature.
From the tool's definition Tool name and description indicate data retrieval only: 'Returns a comma-separated list' with no mention of modification, deletion, or execution. The verb 'list' and output format (comma-separated list) confirm query-only behavior.
Documented attack patterns abuse exactly the kind of access listSupportedFeedsByChain 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 listSupportedFeedsByChain:
{
"version": "1",
"default": "deny",
"tools": {
"listSupportedFeedsByChain": {}
}
}listSupportedFeedsByChain is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Returns a comma-separated list of price feed names for a specified blockchain network. 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 listSupportedFeedsByChain: 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.
listSupportedFeedsByChain 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 listSupportedFeedsByChain 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 listSupportedFeedsByChain. 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.
listSupportedFeedsByChain 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.
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5 Chainlink Feeds tools catalogued and risk-classified — across an index of 43,000+ MCP servers.