Where did all your tokens go?

Agentic coding tools like Claude Code and Codex are no longer just assistants, they’re becoming part of the software delivery pipeline itself. Yet most teams are still evaluating them on intuition: “this feels faster” or “that seems better,” and companies are incurring huge coding agent bills from unmanaged token usage. Now, creating greener software isn't only about the systems running in production, but also the creation of those systems.

This talk explores treating token efficiency as a green-software problem you can measure. Coding agents already emit rich OpenTelemetry data, from token usage and cache behaviour to acceptance rates. Our speaker Annie ran an experiment where she tried out different approaches to using Claude Code, and measured which one was most efficient. She'll share how to instrument agentic workflows with zero overhead, how to read cache-hit rate as a waste signal, and what happens when you compare working styles head to head.

This talk is a hybrid event. For those joining us in person, we will be filming and photographing the talk and the audience for Q&A sections and social media content. Please speak to the organisers if you have any questions or requirements related to this.

Check out the Green Software Brighton website for links to previous talks.

Arrive from 18:00 for pizza and drinks. Event will start at 18:30. We always head for a drink and a chat locally afterwards too.

Thank you to Runway East for use of their space to host our events and to Silicon Brighton and the Green Software Foundation for supporting us.