# How we got to the Personal Agent Protocol

> Meta launched Muse on September 8, 2026. Amazon blocked it on September 20. Sierra and Meta announced Poppy on October 6 and published draft 0.1 on October 9.

Source page: https://poppy.md/timeline  
Last checked against sources: Oct 10, 2026  
poppy.md is independent and not affiliated with Sierra, Meta or any Poppy partner.

| Date | Event | Detail | Source |
| --- | --- | --- | --- |
| Sep 29, 2025 | OpenAI and Stripe release the Agentic Commerce Protocol | ACP powers Instant Checkout in ChatGPT. Stripe issues a shared payment token so the agent never sees the card. Stripe is now also a Poppy launch partner. | [Stripe](https://stripe.com/newsroom/news/stripe-openai-instant-checkout) |
| Oct 14, 2025 | Visa and Cloudflare introduce the Trusted Agent Protocol | TAP lets merchants tell a known agent from an anonymous bot by checking signed HTTP requests, building on Web Bot Auth. | [Visa Developer](https://developer.visa.com/capabilities/trusted-agent-protocol/docs-getting-started) |
| Nov 2025 | Amazon sues Perplexity over its shopping agent | Perplexity called the suit a bullying tactic. It set the tone for how big retailers treat agents that show up uninvited. | [CNBC](https://www.cnbc.com/2026/10/06/meta-joins-companies-to-tame-chaos-of-doing-business-with-ai-bots.html) |
| Jan 11, 2026 | Google announces the Universal Commerce Protocol | UCP covers the shopping flow from discovery to checkout and post-purchase. Shopify helped build it. | [Google Developers Blog](https://developers.googleblog.com/en/under-the-hood-universal-commerce-protocol-ucp/) |
| Sep 8, 2026 | Meta launches Muse | Meta’s personal agent books trips, fills in forms and buys things for its users, in the US first. | [Engadget](https://engadget.com/2253133/meta-reveals-its-ai-agent-that-can-shop-send-emails-and-plan-trips-on-your-behalf/) |
| Sep 20, 2026 | Amazon blocks Muse on Amazon.com | Amazon says Meta declined to remove Amazon from the Muse experience, and that the agent didn’t identify itself while browsing. | [BERI](https://www.beri.net/article/meta-sierra-personal-agent-protocol-oauth-guest-read-write-access-vs-ucp-acp-trusted-agent-protocol-retail-banks) |
| Oct 6, 2026 | Sierra and Meta announce the Personal Agent Protocol | Unveiled at Sierra Summit in San Francisco. OAuth sessions, guest or signed-in, read-only or write access, and three routes the company can offer. | [Sierra (Bret Taylor, Clay Bavor)](https://sierra.ai/blog/introducing-personal-agent-protocol) |
| Oct 6, 2026 | Two partner lists, not one | Sierra names Genesys, Instinct, Rocket, Shopify, Stripe and Walmart. Meta’s list swaps Instinct for NiCE and Decagon. | [CMSWire](https://www.cmswire.com/contact-center/genesys-joins-sierra-meta-on-open-standard-for-personal-ai-agents-01/) |
| Oct 6, 2026 | Decagon open-sources PACT and joins the Poppy working group | PACT, built with Instinct on A2A and OAuth 2.0, ships with a public spec the same day Poppy is announced without one. | [Decagon](https://decagon.ai/blog/introducing-the-personal-agent-consent-trust-protocol-pact) |
| Oct 8, 2026 | First partner demo: Muse with Redfin and Rocket | Sierra shares a live demo by Rocket’s Alex McGillis: Muse works with Redfin and Rocket agents to find homes and get a mortgage pre-approval. | [Sierra on X](https://x.com/SierraPlatform/status/2108245197440307584) |
| Oct 9, 2026 | Draft 0.1 published; Personal Agent Protocol is named Poppy | The specification and overview went live under Apache 2.0. The draft defines discovery at /.well-known/poppy.json, sessions, sign-in, browsing, APIs and conversations. | [Personal Agent Protocol](https://personalagentprotocol.org/docs/spec) |
| Oct 9, 2026 | Sierra announces 35 additional design partners | The new cohort includes OpenAI, Cloudflare, Visa, Mastercard, PayPal, Notion and 29 others. | [Sierra (Bret Taylor, Clay Bavor)](https://sierra.ai/blog/poppy) |
| Oct 10, 2026 | First community SDKs and clients appear | Datalayer publishes Python and TypeScript SDKs, and pi-poppy adds Poppy to the pi coding agent. No official reference implementation yet. | [Datalayer on GitHub](https://github.com/datalayer/personal-agent-protocol) |