How we got to the Personal Agent Protocol

Poppy didn't appear out of nowhere. Meta launched Muse on September 8, 2026. Amazon blocked it twelve days later. Just over two weeks after that, Meta and Sierra announced a standard for exactly that problem: agents showing up at businesses without saying who sent them.

The earlier entries matter too. By the time Poppy arrived, agents already had a checkout protocol (ACP), an identity protocol (TAP) and a commerce protocol (UCP). Poppy's pitch is the piece none of them owns: the customer's permission.

1. Sep 29, 2025Context

   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

2. Oct 14, 2025Context

   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

3. Nov 2025Context

   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

4. Jan 11, 2026Context

   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

5. Sep 8, 2026Context

   Meta launches Muse

   Meta’s personal agent books trips, fills in forms and buys things for its users, in the US first. Engadget

6. Sep 20, 2026Context

   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

7. Oct 6, 2026Poppy

   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)

8. Oct 6, 2026Poppy

   Two partner lists, not one

   Sierra names Genesys, Instinct, Rocket, Shopify, Stripe and Walmart. Meta’s list swaps Instinct for NiCE and Decagon. CMSWire

9. Oct 6, 2026Poppy

   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

10. Oct 8, 2026Poppy

    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

11. Oct 9, 2026Poppy

    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

12. Oct 9, 2026Poppy

    Sierra announces 35 additional design partners

    The new cohort includes OpenAI, Cloudflare, Visa, Mastercard, PayPal, Notion and 29 others. Sierra (Bret Taylor, Clay Bavor)

13. Oct 10, 2026Poppy

    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

The draft continues to evolve. We track revisions and follow-up releases on the spec status page.

poppy.md is independent and not affiliated with Sierra, Meta or any Poppy partner. Facts here come from the sources listed on each page.