France's First Agentic Campaign Goes Live: PubMatic AgenticOS, Amnet, and Claude LLM Activate INTERBEV Video Buy in Minutes

What Happened

On 31 March 2026, PubMatic announced its first agentic advertising campaign in France. Working with Dentsu's trading desk Amnet and client INTERBEV, a video campaign targeting cooking enthusiasts was activated through PubMatic's AgenticOS, an operating system that connects AI agents across the full campaign lifecycle, from natural language planning through activation, optimisation, and measurement.

The Amnet team entered a natural language brief into Anthropic's Claude LLM. The model interpreted the marketing objectives and translated them into structured campaign parameters within AgenticOS. The campaign was live within minutes, where a comparable traditional setup would have taken several hours across multiple tools with manual optimisation steps. PubMatic claims an 80% reduction in setup time.

Why This Matters for Agentic Advertising

This is only the second AgenticOS campaign publicly announced in EMEA, following the Abovo Maxlead activation in the Netherlands. Two live campaigns in two months signals that agentic advertising is crossing from proof-of-concept demos into real media budgets with real clients.

The France launch carries particular weight. The French programmatic market is highly regulated (CNIL, GDPR enforcement), and Amnet (Dentsu) is a major holding company trading desk with established workflow requirements. That this wasn't a small test but an actual brand campaign for INTERBEV, a national industry body, suggests the compliance and governance layers in AgenticOS are mature enough for regulated European markets.

The Technical Architecture

The workflow illustrates the full agentic stack in production:

• LLM layer: Anthropic's Claude processes the natural language brief, extracting campaign objectives, targeting parameters, and KPIs (in this case, video completion rate)
• Protocol layer: MCP/AdCP-enabled connections allow the LLM to interface directly with PubMatic's sell-side infrastructure
• Execution layer: AgenticOS translates the structured output into campaign configuration, audience segment selection, and activation, all without manual intervention
• Supply path: Because AgenticOS is built natively on PubMatic's SSP (a direct bidder on the sell side), there are no additional intermediary integrations. Agencies connect once and access billions of daily premium impressions across CTV, mobile, and online video

Pievra Analysis: What to Watch

Three dynamics make this noteworthy beyond the headline:

1. SSP-side agentic execution is real. PubMatic is building the agentic layer directly into sell-side infrastructure rather than adding another intermediary. This is the model AdCP was designed for: agents communicating directly with supply platforms through standardised protocols. Every campaign that runs this way validates the architectural bet that agentic workflows belong on the supply side, not as another demand-side wrapper.

2. LLM choice signals ecosystem openness. PubMatic used Anthropic's Claude, not a proprietary model. This aligns with the open, interoperable philosophy behind AdCP. The brief-to-activation pipeline works because the protocol layer (MCP/AdCP) is model-agnostic: swap Claude for Gemini or GPT and the AgenticOS execution layer should still function. For agencies evaluating agentic tools, this is reassuring.

3. EMEA expansion pace is accelerating. Netherlands in February, France in March. If PubMatic maintains this cadence, the UK and DACH markets are likely next. Each market adds regulatory complexity (different data protection authorities, different trading desk landscapes), so sustained expansion would demonstrate genuine platform maturity, not just a repeatable demo.