AI agents call getFeeHistory to retrieve information from Agentek Eth without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical data about Ethereum gas fees. It does not modify state, execute transactions, delete data, or commit financial obligations. It is a straightforward read operation with no blast radius if misused by an AI agent—it can only return data that already exists on the blockchain. Classification as Read is appropriate.
From the tool's definition Tool name 'getFeeHistory' and description 'Get historical gas fee info' indicate data retrieval with no side effects. This is a query operation that fetches past gas fee information from Ethereum blockchain history.
Documented attack patterns abuse exactly the kind of access getFeeHistory gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Agentek Eth, and nothing reaches the server without passing your rules. This is the rule we recommend for getFeeHistory:
{
"version": "1",
"default": "deny",
"tools": {
"getFeeHistory": {}
}
}getFeeHistory is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get historical gas fee info. It is categorised as a Read tool in the Agentek Eth MCP Server, which means it retrieves data without modifying state.
Register the Agentek Eth MCP server in PolicyLayer and add a rule for getFeeHistory: 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 Agentek Eth. Nothing to install.
getFeeHistory 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 getFeeHistory 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 getFeeHistory. 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.
getFeeHistory is provided by the Agentek Eth MCP server (nanidao/agentek). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Agentek Eth, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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165 Agentek Eth tools catalogued and risk-classified — across an index of 43,000+ MCP servers.