The minimum viable television campaign has always been defined less by media economics and more by the overhead required to access it. The direct sales relationship, the managed service fee, the minimum commitment structure built around a sales team's cost of service: these are the real floor, not the CPM.

Agentic buying changes the overhead equation. Whether that change is enough to make television genuinely accessible to a different class of advertiser depends on factors that are partly technical and partly about how the market develops on the supply side.

What sets the current minimum viable TV campaign size?

The practical floor for a television campaign is not set by the cost of an individual impression. It is set by the cost of the relationship required to access the inventory. A direct sales team needs to justify the time spent on a deal relative to the revenue it generates. A managed service provider has setup costs, account management costs, and reporting costs that are largely fixed regardless of campaign size.

For most premium TV inventory, the practical minimum is somewhere between £100,000 and £250,000 when accessed through the established route. Below that, the economics of managed service do not work for the intermediary, and the deal terms available are usually inferior to what a larger buyer gets for the same nominal CPM.

The campaign floor is a relationship cost, not a media cost. That distinction matters because agentic buying does not reduce media costs directly. It reduces or removes the relationship cost.

How does agentic buying change the overhead structure?

An agent executing a TV deal does not require a human managed service relationship on either side. The buyer agent works from a structured brief. The seller agent has access to inventory and pricing. The negotiation happens at machine speed through a deal record that both sides own. The human approval step happens at the commitment point, not across every exchange in the negotiation.

This removes the cost of the account management relationship from the execution. It does not remove the cost of the media. It does not remove the cost of the creative. It does not remove the cost of the brief preparation or the post-campaign analysis. What it removes is the layer that exists specifically to manage the human-to-human sales and fulfilment relationship.

For a buyer at the lower end of the TV market, that layer has historically been a disproportionate cost. Removing it changes the minimum viable campaign size because the floor was set by the overhead, not the media.

What does a minimum viable agentic TV campaign actually require?

A smaller advertiser looking to run a minimum viable TV campaign through agent-executed buying needs several things to be in place.

A specific brief. Not a general direction but a structured set of parameters: defined audience, defined geography, defined delivery window, defined frequency, and a stated minimum threshold for what constitutes acceptable delivery. An agent cannot negotiate deal terms that are better than the brief it is working from.

A publisher who has made inventory available on agent-compatible terms. This is the supply-side constraint. Not all publishers have done this. The ones who have tend to be earlier adopters in the streaming and addressable TV space rather than traditional broadcast networks.

Human approval rights at the deal commitment point. Agentic buying does not mean unsupervised buying. The agent proposes deal terms; a human approves the commitment. For an SME with limited margin for error, maintaining that approval step is not optional overhead: it is the control mechanism that prevents a runaway spend.

What can agentic buying not do today for smaller TV advertisers?

It cannot guarantee access to premium linear broadcast inventory. The major broadcast networks have not yet opened their premium inventory to agent-negotiated deals at sub-threshold spend levels. The supply-side development required for that to happen is real and ongoing, but it is not complete.

It cannot remove the minimum spend entirely. Some publishers who have opened inventory to agent negotiation still have floor prices that reflect their cost of trafficking and reporting a deal. Those floors are lower than in direct sales, but they are not zero.

It cannot substitute for creative quality. A campaign with weak creative will underperform regardless of how efficiently the media is bought. Reducing buying overhead does not improve the creative, and smaller advertisers with constrained production budgets need to be realistic about that component of campaign performance.

How does the minimum viable campaign size change as the market develops?

The current position is that agentic buying reduces the effective minimum for addressable and streaming TV inventory where publishers have built compatible supply-side infrastructure. The reduction is meaningful: campaigns that were not economically viable at £20,000 to £40,000 become viable if the publisher infrastructure supports it and the buyer has a specific enough brief.

The direction of travel is clear: as more publishers invest in agent-compatible inventory access, the floor will continue to lower. The pace at which that happens will determine when agentic TV becomes a realistic channel for SME budgets rather than an early-stage option for well-resourced advertisers with specific use cases.

The honest answer today is that agentic TV buying is an accessible option for some smaller advertisers in some inventory contexts. It is not yet a general solution to the access problem. The distinction between those two positions matters for any advertiser making resource allocation decisions based on what the channel can deliver now rather than what it will deliver in future.