Agent eXperience Interface (AXI) AXI defines ergonomic standards for building CLI tools that autonomous agents interact with through shell execution. Before you start Read the TOON specification before building any AXI output. 1. Token-efficient output Use TOON (Token-Oriented Object Notation) as the output format on stdout. TOON provides 40% token savings over equivalent JSON while remaining readable by agents. Convert to TOON at the output boundary — keep internal logic on JSON. 2. Minimal default schemas Every field in stdout costs tokens — multiplied by row count in collections. Default t…