Sierra on October 6, 2026, announced Personal Agent Protocol, an open standard designed to define how personal AI agents interact with businesses. The company said it is developing the protocol with Meta and industry partners at Genesys, Instinct, Rocket, Shopify, Stripe, and Walmart, with a v0.1 specification planned for later in October 2026. According to Sierra, the standard is meant to handle authentication, empower consumers, and let companies see what personal agents are doing when they…