I built an AI voice agent inside a retro orange rotary phone for my 4-year-old. He picks up the handset, asks a question, and gets a spoken answer. No screen; no app; the phone is the whole interface. Behind the scenes, a set of AI agents process the conversations and recommend books, outings, and activities to parents based on what their kid(s) is curious about. The idea is to turn a child's questions into real-world experiences (library books, construction site visits, tide pool trips) without anyone having to plan a curriculum.

67 MODE: There's also a privacy mode (dial 67) for older kids to ask questions they might not want to discuss with their parents. Safety guardrails still apply, but no summaries are shared. Hardware is a Grandstream ATA bridging an analog phone to Cartesia's voice API + Claude. The philosophical write-up is at the link above; the technical README is at https://github.com/TDaltonC/the-answering-machine.