April 27, 2026

Agents Negotiate With Agents, and the UCP Council Doubles

April 21-27, 2026 - Agent-to-agent commerce got its first credible test, and the open protocol got five very large new owners.

Last week we covered signed agents and Europe’s first native ACP sales channel. This week the conversation moved one layer up. Anthropic published results from the first real-world test of AI agents trading with each other on behalf of human owners. The Universal Commerce Protocol’s governing body doubled in size in a single day. Ulta became the first beauty retailer to ship a native UCP integration. And Anthropic kept turning Claude into a daily-life front door, with Instacart now built into the chat.

Here’s what happened.

Anthropic’s Project Deal: agents trading with agents, for real money

On April 24, Anthropic published results from Project Deal, an internal experiment originally run in December 2025 in which Claude acted as a personal shopping and selling agent for 69 employees in Anthropic’s San Francisco office. Each participant got a $100 budget in gift cards. Claude agents listed personal belongings, hunted for items their owners might want, and negotiated prices with other Claude agents in natural language. Deals that closed were honored with real goods and real money.

The numbers: 69 agents, more than 500 listings, 186 closed deals, just over $4,000 in transaction value. Anthropic wrote that it was “struck by how well Project Deal worked.” 46% of participants said they would pay for the same service in the real world.

The more important finding is the one Anthropic flagged as a concern. In parallel runs, agents powered by stronger models (Opus) extracted measurably better outcomes than agents powered by weaker ones. Opus-represented sellers earned about $2.68 more per item, buyers saved about $2.45, and Opus participants closed roughly 2.07 more deals each. Owners of the weaker agents never noticed they were getting worse outcomes.

Why it matters for merchants: This is the first published evidence that agent-to-agent negotiation works at scale outside of a research demo. It is also the first evidence that the model your agent runs on top of is going to matter as much as the price-comparison logic itself. For merchants, the read is twofold. First, the buyer side of every transaction is about to start arriving with its own agent, its own preferences, and its own model. Second, the negotiation surface that agents talk to (your product data, your pricing logic, your return terms) needs to be machine-readable, because the human reading it is increasingly not the one making the call.

UCP Tech Council doubles: Amazon, Meta, Microsoft, Salesforce, Stripe join

On April 24, the Universal Commerce Protocol Tech Council added five new members: Amazon, Meta, Microsoft, Salesforce, and Stripe. The founding members were Google, Shopify, Etsy, Target, and Wayfair. The council, which reviews and votes on changes to the UCP specification (identity, payments, loyalty, local inventory, returns), doubled from five to ten organizations in a single announcement.

The mix is notable. Amazon joining UCP governance is the move that breaks the cleanest narrative line in this space. Until last week, Amazon’s relationship with open agent protocols was litigation, not contribution (see our coverage of the Comet injunction and the ACLU amicus filing). Now Amazon will help vote on what the open protocol does. Meta and Microsoft round out the platform side. Stripe joining UCP governance while continuing to maintain ACP with OpenAI tells you that the two protocols are no longer being treated as winner-take-all.

UCP Tech Council	Role	Joined
Google	Founding, protocol co-author	Founding
Shopify	Founding, protocol co-author	Founding
Etsy	Founding, retailer	Founding
Target	Founding, retailer	Founding
Wayfair	Founding, retailer	Founding
Amazon	New, retailer + cloud + agent layer	April 24, 2026
Meta	New, agent platform	April 24, 2026
Microsoft	New, Copilot, Azure, Bing	April 24, 2026
Salesforce	New, commerce platform	April 24, 2026
Stripe	New, payments + ACP co-author	April 24, 2026

Why it matters for merchants: Protocol governance is boring. Protocol governance is also where lock-in either happens or doesn’t. With ten of the largest commerce, payments, and AI infrastructure companies on the same technical body, the surface area of UCP is going to expand fast (more payment options, more identity hooks, more retailer-side controls). For merchants, the practical implication is that betting on a UCP-supported platform now looks more like betting on HTTP than like betting on a single vendor’s standard. If Stripe is contributing both to ACP and to UCP, and Adobe Commerce ships MCP as its default agent protocol, the future is multi-protocol, not protocol-monogamous.

Ulta brings beauty into Gemini

On April 22, Ulta Beauty and Google announced Gemini-enabled shopping across two surfaces. The first is UCP-powered checkout for Ulta products inside AI Mode in Search and the Gemini app, rolling out over the next month. The second is Ulta AI, a conversational assistant on Ulta.com (and the Ulta app shortly after) built on Gemini Enterprise for Customer Experience and trained on Ulta’s catalog plus signals from its 46 million loyalty members.

Beauty is a category where this matters a lot more than it sounds. Discovery is dominated by recommendations and reviews, the assortment is huge, and customers want personalized advice rather than a search box. Until now, Sephora was the most prominent beauty retailer with a public agentic commerce footprint (a ChatGPT app via OpenAI’s ACP). Ulta plus Sephora means the category is officially in play.

Why it matters for merchants: If you sell beauty, hair, or skincare, you are now competing for visibility inside two different AI shopping channels (ChatGPT through Sephora’s ACP integration, Gemini through Ulta’s UCP integration). Both channels favor structured product data. Both reward complete attribute coverage. If your product information is thin (no shade range, no skin-type tags, no ingredient list, no usage notes), you are invisible in this channel and you will not know it.

Instacart inside Claude: Anthropic builds a daily-life front door

This week, Anthropic added Instacart as a connector inside Claude. Users can build a grocery cart from a recipe, a meal plan, or a casual prompt; Claude pulls live inventory, pricing, and personalized recommendations from the user’s Instacart account; the cart syncs back to the Instacart app for fulfillment. The launch came alongside a broader rollout of consumer connectors: Spotify, Uber, Uber Eats, AllTrails, Booking.com, TripAdvisor, Resy, StubHub, Audible, Intuit TurboTax, Intuit Credit Karma, Taskrabbit, Thumbtack, and Viator all became Claude connectors in the same window.

The strategic shift is the interesting part. For most of the past year, Claude was positioned as a developer and enterprise assistant. ChatGPT owned the consumer surface. With this rollout, Anthropic is making the case that Claude is a credible front door for daily life: groceries, music, transport, travel, taxes, errands. That puts a third major chat surface on the agentic commerce board, alongside ChatGPT (ACP) and Gemini (UCP).

Why it matters for merchants: Two takeaways. First, AI shopping discovery is no longer a single-platform question. Merchants need to think about visibility across three chat surfaces (ChatGPT, Gemini, Claude), not one. Second, Instacart’s positioning here is instructive. Instacart called itself “the grocery infrastructure layer for agentic AI.” That is the same playbook Walmart is running with Sparky, Sephora is running with its ChatGPT app, and Ulta just announced. The retailer-owned agent embedded inside neutral AI platforms is now the dominant pattern at every scale that can afford it.

Where the AI commerce stack stands this week

Layer	Update this week
Agent-to-agent commerce	Project Deal: 186 deals, $4K value, model strength matters
Protocol governance	UCP Tech Council doubles to 10 members
Discovery surfaces	Claude joins ChatGPT and Gemini as a third consumer surface
Retailer agents	Ulta AI on Gemini Enterprise, Instacart embedded in Claude
Beauty category	Ulta + Sephora both shipping native AI integrations
ACP / UCP standoff	Both protocols now share Stripe in their governance bodies

What merchants should do this week

1. Audit your discovery footprint across all three chat surfaces. ChatGPT (ACP), Gemini (UCP), and now Claude (connectors and MCP). If you are on Shopify, your products already feed into ACP and UCP. If you are on another platform, ask your vendor what their Claude story is. “We support ChatGPT” is no longer a complete answer.

2. Take agent-to-agent negotiation seriously. Project Deal is small, but the result is unambiguous: agents can negotiate, and the model behind the agent meaningfully changes the outcome. The first place this lands for retailers will be returns, refund disputes, and price-match requests. If your customer service flow assumes a human is reading the policy, that assumption has a shelf life.

3. If you sell beauty, treat structured product data as table stakes. Shade ranges, ingredient lists, skin-type tags, allergen flags. Ulta and Sephora both win because their catalogs are deeply structured. Indie beauty brands that rely on lifestyle copy and beautiful photography will be competing on what the agent can parse, not what the human can feel.

4. Watch the UCP Tech Council changelog. With ten of the largest companies in commerce voting on the spec, UCP capabilities are about to expand quickly. Subscribe to your platform vendor’s UCP roadmap and treat protocol updates the same way you treat browser updates: not optional.