Stop agents from hallucinating APIs.

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Tessl is pioneering spec-driven development

Shaping the future of software development is a community activity. Join us on the journey.

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Software development is undergoing its biggest shift since open source.

Spec-Driven Development reimagines how we build: intent is written in natural language and captured in specs, AI generates the implementation, and systems evolve themselves over time. The result is higher-quality software, built faster, by more people, with AI at the core.

This transformation from code-centric to spec-centric software starts with Agents.

Agents are powerful, but today they’re unreliable. They rush to code before understanding the requirements, claim success prematurely, hallucinate open source APIs, and break features when adding new ones. Without guardrails, agents are fast but fragile, and unfit for production codebases.

Tessl’s products keep agents on rails and well informed. Framework specs define the functionality agents need to build, and contain tests to verify their work. Registry specs distribute reusable knowledge to agents, preventing hallucinations and ensuring they apply the right practices. Overall, they focus developers on what to build, and help agents tackle the how.

The outcome: you get the speed of agentic coding, with the reliability of production software.

Join us in reshaping how software gets made.

Built to lead

A bold vision, led by a team with decades of experience building developer tools, scaling startups into category leaders, and delivering products used by millions

Guy Podjarny is the founder & CEO of Tessl, the pioneering AI Native Development platform. Guy previously founded Snyk, which created and leads the Developer Security market, scaling it to an $8B company. Before that, he founded Blaze and sold it to Akamai, where he served as CTO.  Guy is an active angel investor, and a co-host of the AI Native Dev podcast.

Guy Podjarny

Founder & CEO at Tessl

Backed to win

Supported by investors who share our vision

  • boldstart
  • Index Ventures
  • GV
  • Accel

Come join us

If you’re passionate about helping developers put agents to work, we’d love to chat

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Join our community

Tessl is behind AI Native Dev, a community of developers reshaping how software gets made with AI. It’s where you connect with peers, share what works, and shape the spec-driven, AI-native movement together.

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Keep your agents on the rails with Tessl

The Tessl Framework and Registry are now available in beta

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