The category error that's causing brands to solve the wrong problem.
McKinsey projects $3 to $5 trillion in agentic commerce by 2030.
Global e-commerce is projected to reach roughly $7 to $8 trillion by the same year.
If agentic commerce were a subset of e-commerce, McKinsey's number would mean agents mediating more than half of all online retail within four years. That is an implausible claim. No technology transition in commerce history has captured the majority share that fast.
The number only makes sense if McKinsey is measuring something different, not a slice of digital retail, but a projection of how much commerce across all channels will be initiated and mediated by agents, regardless of where the transaction ultimately completes.
That distinction is not semantic. It is the most important strategic framing question in agentic commerce right now, and most brands are getting it wrong.
The category error
E-commerce is a channel descriptor. It describes where transactions happen: digital storefronts, browser-based checkout, and online payment flows. The defining characteristic is the medium through which the consumer interacts with the commerce surface.
Agentic commerce is a mediation descriptor. It describes who initiates the transaction and how: a delegated agent acting on a consumer's declared mandate rather than a human navigating a browsing session. The defining characteristic is the presence of an intermediary layer between consumer intent and commercial outcome.
These are not the same type of thing. One describes a channel. The other describes a mediation model that can operate across channels.
The confusion arose because the first visible agentic commerce deployments, ChatGPT Shopping, Gemini checkout, and Perplexity Buy with Pro, happened to be digital-native platforms. Early observers mapped them onto the e-commerce category because the transaction was completed in a digital interface. But the interface where the transaction is completed is not the defining feature. The agent mediating the decision is.
What the mediation model actually touches
An agent executing a commerce task on a consumer's behalf does not care about the channel taxonomy brands use to organize their marketing budget.
A travel agent configures a flight, hotel, and car rental across three different booking systems. A financial agent rebalances a portfolio, pays a bill, and renews an insurance policy. A grocery agent replenishes a standing list, substituting where items are out of stock and flagging when the brand preference is unavailable. A home improvement agent builds a parts list for a project, checks local store inventory, and reserves the items for pickup.
None of these transactions is e-commerce in the traditional sense. Some complete inside AI platforms. Some complete inside loyalty apps. Some complete through voice interfaces. Some initiate online and close in a physical store through a BOPIS fulfillment flow. The back end that executes each transaction, the OMS, the payment rail, and the fulfillment infrastructure, is the same infrastructure that has always powered commerce. What changed is the layer above it.
The discovery and selection layer that precedes the transaction has moved. In e-commerce, that layer was a browser session: a consumer navigating a website, evaluating options, and adding to cart. In agentic commerce, that layer is a mandate: a consumer configuring parameters and delegating execution to an agent. The transaction still touches the same infrastructure. But the human browsing session that triggered it is no longer there.
Why is the scope larger than e-commerce?
If you accept that agentic mediation applies to any channel where agents can operate, which is increasingly every channel, then the addressable scope of agentic commerce is not "digital retail." It is "commerce wherever agents operate," which is a substantially larger and more distributed surface.
Consider the verticals where agent mediation is already live or imminent:
Travel. Agents configuring multi-leg itineraries, managing loyalty redemption across programs, booking across hotel, flight, and ground transportation in a single delegated flow. This is not e-commerce. This is agent-mediated commerce that touches every booking system in the travel stack.
Financial services. Agents managing subscription renewals, insurance comparisons, loan applications, and investment rebalancing within declared parameters. TRID, FINRA, and IAA requirements structure how delegation works here, but the agent mediation model applies regardless of the regulatory constraints on it.
Real estate. Agents are compressing the discovery and scheduling phases of property search, coordinating showings, and managing document preparation. The Delegator posture is structurally bounded by transaction stakes and legal requirements at offer and contract stages, but the upstream agent mediation is substantial.
Retail DTC. The channel is most commonly labeled "agentic e-commerce," but even here, agents are mediating across both online and in-store fulfillment surfaces. A Scoper-posture consumer who delegates restocking within a declared brand list and price ceiling is not conducting e-commerce. They are delegating a standing commerce mandate that executes across whatever fulfillment surface the agent finds available.
The McKinsey $3-5T figure starts to make sense when you aggregate across these verticals. It is not a projection of agentic share within e-commerce. It is a projection of commercial value that flows through agent-mediated decision processes across the full commercial landscape.
The wrong investment that follows from the wrong framing
When brands treat agentic commerce as a subset of e-commerce, the strategic implication is that it requires an e-commerce optimization response: better product pages, improved conversion flows, more sophisticated retargeting, incremental SEO investment extended into GEO.
None of those investments addresses the mediation layer.
An agent does not browse your product pages. It queries your structured data infrastructure. It does not respond to your retargeting. It executes within the parameters your consumer declared when they configured their mandate. It does not arrive through a search result. It arrives through a protocol query that either finds your product data machine-readable and complete or does not find it at all.
The optimization discipline for agents is entirely different from the optimization discipline for human browsers. The measurement infrastructure is different. The competitive dynamics are different. The compounding mechanisms are different.
Brands that have framed this as an e-commerce optimization problem are investing in the interface layer, while the mediation layer that determines whether agents select them at all goes unbuilt.
What are the correct framing changes
If agentic commerce is a mediation model rather than a channel, the strategic implication is that every brand in every vertical with a consumer-facing commerce dimension is in scope, not just the ones running digital storefronts.
The infrastructure requirement cuts across channels simultaneously. A brand's product data needs to be machine-readable, whether the agent querying it is operating inside ChatGPT, Gemini, a loyalty app, a voice interface, or a financial agent. A brand's checkout infrastructure needs to accept agent-initiated transactions regardless of which protocol the agent is running. A brand's loyalty data needs to be accessible to agents operating on behalf of consumers who hold loyalty status.
None of this is an e-commerce project. It is a commerce infrastructure project that happens to include digital channels as one of its components.
The brands that will navigate the next three years well are the ones that have correctly identified the scope of the problem they are solving. Agentic commerce is not a new channel to add to the digital marketing mix. It is a structural change in how commerce initiates, and that change touches every channel simultaneously, which is exactly what the McKinsey number is actually measuring.