Chain Gas Price Monitor

This tool fetches real-time gas price information, including base fee and priority fee, for supported EVM networks and returns structured fee data for SafeLow, Standard, and Fast confirmation speeds. It accepts two inputs: chain (required string enum: ethereum, base, polygon) to specify the target network, and fidelity (optional string enum: fast, standard, detailed, default standard) to control how detailed the fee breakdown should be. The executor may supply additional payloads with raw gas metrics, which must be transformed into the final response. The tool output must strictly validate against the system-provided structured output schema (auto-produced, not supplied here), with no extra fields and correct types and enums.