Europe 2026
Harnesses in AI: A Deep Dive — Tejas Kumar, IBM
Overview
This talk explores the concept of AI harnesses, defining them as the components surrounding an AI model that provide grounding in reality and ensure reliability. The speaker argues that harnesses are crucial for making AI agents dependable, especially when using rented, black-box models. By building a harness, developers can create stable environments that control agent behavior, regardless of the underlying model's non-deterministic nature.
Who should watch
- AI Engineers
- Product Managers
- Builders working with AI agents
- Those seeking to improve the reliability of AI applications
- Developers looking to use cheaper or smaller models effectively
Key takeaways
- AI harnesses provide reliability by grounding AI models in a stable, controlled environment, mitigating the unpredictability of black-box models.
- A harness is distinct from the AI model itself; it comprises elements like a tool registry, context management primitives, guardrails (e.g., max iterations), an agent loop, and a verification step.
- Building a harness allows developers to achieve desired outcomes without necessarily altering the core AI model or its prompts, as demonstrated by a practical example of upvoting a Hacker News post.
- Guardrails, such as limiting iterations or message counts, are essential components of a harness that enforce operational boundaries.
- Verification steps within a harness can deterministically check if an agent's actions were successful, preventing the agent from falsely reporting success.
- Harnesses can incorporate logic for handling common issues like failed logins or redirects, ensuring more robust agent performance.
- The speaker posits that 2026 will be the year of harnesses, with future advancements potentially including dynamic, on-the-fly harness generation for agents.
Notable quotes
*The agent harness is everything around the model that gives it grounding in reality.*
*The name of the game with harness is reliability.*
*It's amazing cuz it really grounds black box models in a stable environment that you control.*
Unofficial community note. Prefer the recording for nuance.