Meta and Sierra Announce Personal Agent Protocol — No Spec Yet, OpenAI Outside

Personal agents now reach millions of users. The bottleneck is no longer the model — it is whether merchant sites will let the agent in. Meta is co-authoring the handshake.

On October 6, Sierra co-founders Bret Taylor and Clay Bavor announced Personal Agent Protocol: an open standard that Meta and Sierra are developing with Genesys, Instinct, Rocket, Shopify, Stripe and Walmart (Sierra's partner list). Under the design, consumers choose what access their agent has (read-only or write) and companies set what agents may do. An agent discovers options on a company's website and starts a session for its user — guest or signed-in. The session is built on OAuth and carries across channels, then completes tasks via the company's website, its APIs (MCP, OpenAPI) or the company's own agent.

There is no published specification yet. Sierra plans to publish a v0.1 later this month, plus design workshops and a reference implementation. Possible later extensions: finer-grained permissions, push notifications and payments.

Who is in — and who is not

Taylor, who is also OpenAI's chairman, told CNBC "it is kind of chaos until such a standard exists," and said companies will know when they are dealing with a personal agent rather than a person. He said OpenAI and Anthropic are not on board now but he expects them to participate.

TechCrunch lists a partly different partner set that includes NiCE and Decagon (and omits Shopify/Instinct). Use Sierra's list as primary; attribute NiCE/Decagon to TechCrunch.

Meta's David Singleton told CNBC that Muse has millions of US users — Singleton's claim. That is the product this protocol is meant to unblock: sites from Amazon (which blocks Muse) to airlines, Yelp and eBay are blocking or tripping up personal agents, TechCrunch reports. Muse context: gadgets/SDK drop, Connect glasses / Charm.

The distribution play

Whoever writes the agent–merchant handshake shapes authentication, liability and, eventually, payments for agent commerce. Meta is co-authoring alongside a commerce coalition while OpenAI and Anthropic sit outside for now. The OAuth-session model also gives businesses a way to tell sanctioned agents from scrapers — the friction behind Amazon's Muse block.

For now this is an announcement of intent: no published spec, no named implementations beyond the partners, and partner lists that already disagree between sources.

Limits

• No v0.1 yet — "later this month" per Sierra.
• Partner-list conflict: Sierra vs TechCrunch (NiCE/Decagon attributed).
• Meta's own announcement post was quoted by TechCrunch but not inspected here.
• Muse "millions of users" = Singleton via CNBC.

Sources

• Sierra: Introducing Personal Agent Protocol (October 6, 2026)
• CNBC: Meta joins with group of companies to tame 'chaos' of doing business with AI bots (October 6, 2026)
• TechCrunch: The next hurdle for AI agents — getting websites to let them in (October 6, 2026)
• Times of AI: Meta Muse gadgets (October 2, 2026)
• Times of AI: Meta Connect Muse glasses / Charm (September 24, 2026)