
Written by a model from the transcript; not yet reviewed.
John Norona, co-founder and chief product officer of Gamma, joins the podcast to discuss agent harnesses, vertical agent applications, and the real-world mechanics of building modern AI products. Gamma, a platform that has grown to 100 million ARR, uses a creative agent harness to handle visual communication, presentations, documents, and websites. The discussion details what happens under the hood when a user enters a prompt, touching on agent sandboxes, parallel LLM calls, and automated visual quality assurance rounds. Throughout the episode, the guest and host explore the shift from simple LLM wrappers to sophisticated agent harnesses, the importance of subjective design choices, managing high experimentation velocity, and identifying underexplored niches for startup founders.
Greg welcomes John Norona and sets expectations for the episode.
John explains what an agent harness is and how Gamma built one.
John walks through the end‑to‑end process of generating a presentation with Gamma’s agent harness.
Greg and John discuss the importance of running many experiments and learning from data.
Discussion of untapped niches where a new agent harness could thrive.
Exploration of how marketers become engineering‑like, automating workflows with agents.
John talks about AI smell, the need for diverse creative outputs, and how Gamma tackles it.
John shares his vision for a personal agent that learns from user behavior, especially in Slack.
John explains why early‑stage founders should use existing LLMs and when to fine‑tune.
John describes how Gamma quickly integrates new models and runs real‑time experiments.
John highlights the under‑hyped potential of image models for vertical products like interior design.
Final reflections on experimentation, AI smell, and building the next agent harness.
Defining The Agent Harnessinsight
The guest explains that an agent harness consists of all the tools an AI uses to execute tasks in its environment, inspect its own work, and deliver a finished product to the user. Using Gamma as an example, a creative agent harness must understand art styles, generate imagery, and manage layout constraints.
Inside A Presentation Generationdata
When a user submits a prompt, Gamma spins up a cloud sandbox, runs multiple models to gather context and outline the presentation, and makes up to 200 model calls across 20 different models. An AI vision model then performs visual QA on every slide before the output is finalized.
Traits Of Good Agent Nichesinsight
Good use cases for custom agent harnesses involve subjective judgment calls where different people disagree on what constitutes a good output. This human-in-the-loop requirement creates an opening for unique product design.
Deodorizing The AI Smellstrategy
The guest discusses the problem of AI smell, where work generated by AI looks distinctly generic and recognizable. Gamma launched a system to continuously cycle through diverse creative looks to avoid this uniform appearance.
Subjectivity And Missing Evalsinsight
Traditional software evaluations work well for objective tasks, but fail in creative domains like visual design and personal voice. Founders operating in subjective spaces must rely on taste and large-scale A/B testing instead.
Cloud Versus Open Source Modelsinsight
The guest argues that closed-source cloud models are currently underrated due to intense competition among labs and the immense work already done for application builders. Startups should leverage these off-the-shelf models to drive usage first.
An experiment to remove upfront friction and questions in order to speed up generation failed to win against the slower default flow. Users who reviewed outlines and answered questions felt more invested and converted to paying customers at a higher rate.
“I think there's truth to it, although I always disputed this concept of the GPT wrapper originally, because it sort of implies that 90% of the work is the LLM, and then there's just this thin layer on top, which is the wrapping back and forth.”
“We have a library of templates with different visual styles. We're going to use vision models, try to figure out which one's a good fit for you. And we do some cool search embedding things to sort of look at the space of thousands of templates and find the right one.”
“I would just always encourage people who are thinking of starting a business to know that it is a long and sometimes lonely journey.”
I sit down with Jon Noronha, co-founder and chief product officer of Gamma, to break down agent harnesses and the startup openings around them. Jon explains how Gamma rebuilt its product as a creative agent this year and walks me through the roughly 20 models and 200 calls behind one finished presentation. We talk about AI smell, why taste carries more weight than evals in creative work, how Gamma tests a new model within the hour, and the fast mode test that lost to good friction. Jon also shares the harnesses he wants to see, from a Slack agent that learns his voice to a couch shopping tool that checks the fit in your room. If you want to build a vertical agent, this episode gives you a clear model of what a harness is and where your edge can come from. This episode was made possible thanks to Anthropic (the team behind Claude) for hosting us at Claude Founder house and sponsoring the episode. Timestamps 00:00 – Intro 01:23 – What Is an Agent Harness 03:36 – Harnesses as the New Wrappers 04:25 – Inside One Gamma Prompt 08:23 – Where Vertical Harnesses Fit 11:08 – Finding Your Edge 11:56 – Opportunities for Harnesses 13:09 – Designing a Niche Harness 13:48 – AI Smell 15:49 – Evals and Taste 18:40 – Who Pays for AI 19:44 – The Gamma for X 20:19 – A Harness for Slack 22:01 – Building on Other People's Models 23:28 – Closed vs. Open Source Models 24:11 – A Broad but Shallow Stack 24:57 – Prompts vs. Fine-Tuning 25:30 – Testing New Models 26:25 – Running Experiments 29:10 – The Marketing Engineer 32:26 – Interesting Automations 33:33 – The Top 1% Marketing Engineer 35:00 – Everyone Is Now a VP of Agents 36:19 – Experiments as a Numbers Game 38:26 – Underhyped: AI Image Models 40:42 – Startup Opportunities 45:40 – What Jon Would Build Next 47:26 – Closing Thoughts Key Points An agent harness is the set of tools an agent uses to act, check its own work, and deliver a finished result. One Gamma presentation uses about 20 models and 200 calls, including rounds of visual QA. Strong harness ideas sit in subjective work, where people care about the output and want a human in the loop. Your edge comes from a distinct vision, proprietary data, or a business that mixes AI with the physical world. Gamma gets 98% of its value from prompts and treats fine-tuning as a cost and quality optimization. Experiments reward volume, and Gamma's fast mode test showed that good friction raised paid conversion. FIND ME ON SOCIAL X/Twitter: https://twitter.com/gregisenberg Instagram: https://instagram.com/gregisenberg/ LinkedIn: https://www.linkedin.com/in/gisenberg/ FIND JON ON SOCIAL X/Twitter: https://x.com/thatsjonsense?lang=en LinkedIn: https://www.linkedin.com/in/jonnoronha/
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