Sierra announces Personal Agent Protocol with Meta and business partners

Sierra says the protocol defines how personal agents interact with businesses and is open for anyone to implement.[2] The company says it is designed to handle authentication, give consumers more agency and let companies see what agents do.[2] Sierra and Meta are developing it with Genesys, Instinct, Rocket, Shopify, Stripe and Walmart.[2] The announcement targets tasks consumers already use agents for, including scheduling appointments, booking flights and shopping for car insurance, according to Sierra.[2]

Sierra describes a process that starts when an agent discovers a company’s offerings and how to reach it on the company website.[2] An agent can begin as a guest to check product availability or ask about a returns policy.[2] If account access is needed, the customer can sign in on the company page or use credentials already configured with the agent.[2] Customers choose read-only or write access, and Sierra says sessions use OAuth and carry across channels.[2]

Companies can route agents through their regular web pages, or connect them through APIs built on standards such as MCP and OpenAPI, Sierra says.[2] A business can also use its own agent for tasks that require conversation, such as a warranty claim.[2]

Sierra said it planned a v0.1 specification later in October 2026, indicating that the detailed specification was still forthcoming at announcement.[1] The company says more detailed permissions could let customers and businesses limit specific actions in the future, and that payment extensions could allow purchases without sharing credit-card information.[2] Sierra chairman Bret Taylor said OpenAI and Anthropic were not participating at the time, though he expected them to join.[3] Those points leave adoption and the final scope of the specification unsettled.