Tessl

Join us in London on Tuesday, 21 July for an evening exploring Harness Engineering. From building codebases that agents can reliably work with to creating data foundations they can actually trust. Hear from Dru Knox, Head of Product & Design at Tessl, on why harness engineering is becoming a core skill for agentic developers, and William Martin, PhD, Data & AI Evangelist at Dremio, on what it takes to build a data harness that delivers fast, reliable results for AI agents. Register here: https://tessl.co/qrq

Most teams are experimenting with coding agents. The ones pulling ahead are building the systems that help those agents succeed. At AI DevCon, Patrick Debois explores the rise of Agent Enablement and why scaling AI isn't just about giving every developer an agent. It's about building the platform, practices, and governance that help teams get consistent results. If you're thinking beyond individual productivity and toward AI-native engineering at scale, this talk is well worth watching. Watch now: https://tessl.co/k4v

Claude Tag wasn't built to replace Claude Code. It was built for the conversations happening around it. We sit down with Lamis Mukta from Anthropic to explore why Claude Tag exists, how it grew from an internal side project into a company-wide tool, and what it takes to bring AI teammates into Slack safely and effectively. From agent identities and permissions to dogfooding, trust, and the future of collaborative AI, it's a fascinating look at how Anthropic builds and uses its own tools. Watch now: https://tessl.co/0v8

Software factories are becoming the next evolution of software development. In this conversation with Dru Knox, Steve Yegge shares his one-sentence definition of a software factory and why it's one of the biggest shifts happening in AI-native software development. From harness engineering to AI-native development, the conversation explores what it takes to build software systems that continuously improve over time. Watch now: https://tessl.co/2ef

AI can generate skills in seconds. The difficult part is knowing whether those changes are actually ready to merge. Tessl introduces the new Tessl Review, a major upgrade that helps teams review AI-generated skill changes against the standards that matter to their organisation. Every team has a different idea of what "good" looks like. Some care about architecture patterns, others prioritise security, coding conventions, domain-specific requirements, or internal best practices. A single default score can't capture all of that. With custom review rubrics, you can define your own review criteria and evaluate skills against your team's standards, not somebody else's. The new review experience also brings more accurate agentic reviews, a shared history of review runs, and tessl review fix to help improve skills that don't meet the quality bar. Because faster software delivery shouldn't come at the cost of quality. Read the blog to learn how Tessl Review helps teams build, review, and improve skills with confidence. https://lnkd.in/gnxgtHny

Tessl Academy is now available in preview. Tessl Academy is a hands-on curriculum for building, evaluating, and running skills for coding agents. This release includes two courses, Skill Foundations and Tuning Your Agent. Every lesson can be read directly in the browser without installing anything, or you can install a course and have your coding agent, including Claude Code, Cursor, Codex, or Tessl Agent, guide you through each lesson interactively as you work. We wanted to release this early rather than wait for a more polished version because we expect the curriculum to improve with your feedback. If you've been looking for a way to move from ad hoc prompting to repeatable agent workflows, we'd love for you to try it and tell us what should come next. Get started here: https://lnkd.in/dNNjPAc5

Building reliable AI systems takes more than better models. If you're in San Francisco, join Steve Yegge, Advisor & Consultant, and Dru Knox, Head of Product & Design at Tessl, for a fireside conversation on Harness Engineering and the systems that help coding agents succeed in production. Expect practical insights on context, evaluation, guardrails, testing, and the engineering practices shaping the next generation of AI development. Today, July 1, 2026 • 6:00pm to 9:00pm, SF The event is currently full, but you can still join the waitlist if you'd like to attend. Here' the link to register: http://tessl.co/mmj

Hot on the heels of the launch of Tessl Agent, Simon Maple sat down with Guy Podjarny and Dru Knox at AI Engineer World's Fair to talk about what Tessl Agent is and how it improves your agents and workflows. If you're in San Francisco stop by the booth to learn more and get started with Tessl Agent. Read more about Tessl Agent at https://tessl.co/8cl and try it out by visiting https://tessl.co/wy5.

Your AI coding agent keeps making the same mistakes. Not because the model is bad. Because nobody has time to teach it. That's what Tessl Agent is built to solve. Instead of waiting for someone to update prompts, write new skills, or automate recurring tasks, Tessl Agent watches how your team works. It learns from PRs, coding agent sessions, and issue trackers, then opens PRs with improvements and automates the repetitive work that keeps getting pushed to "later." It's an agent that quietly improves your existing agents and workflows over time, so your team spends less time fixing the same problems and more time shipping. Tessl Agent is now in open beta. Read more about it here: https://tessl.co/8cl Or try Tessl Agent today: https://tessl.co/wy5

Think your skill is good? Prove it. 🛠️ Simon Maple is at the AI Engineer World's Fair in San Francisco and he's throwing down a challenge: Bring your skill to the Tessl booth tomorrow — Tuesday, June 30th, 1–4pm — and we'll put it through the Skill Optimizer live, on camera. Here's what you get: - A quality check on your skill - An impact check — does it actually make your agent better? - Fixes applied in real time - An on-camera interview about how you're using skills and context today, and how dev works at your org Your skill, your story — filmed live and featured on the AI Native Dev YouTube channel. See you at the booth. 🎤 #AIEngineer #AINativeDev #Tessl #AgenticCoding #SkillOptimizer