Tessl
I'm Guy, the founder behind Snyk — now building Tessl, a package manager for agent skills. We’ve recently witnessed that most teams still treat skills as static artifacts: markdown files, created or copied from repo to repo. This approach offers a strong initial boost, but quickly creates debt: - Skills are duplicated, and updates never roll out. - Poor quality skills go unseen, misguiding agents instead of helping. - Skill knowledge grows stale, and don’t keep up with the systems and practices they describe. Without a way to evaluate skills, teams have no clear way to understand how good a…
Tessl launched on February 26, 2026 with 260 votes, #103 of 16,628 launches that month and more than 99% of that year's launches.
In plain words
Tessl is a developer tool for evaluating and optimizing AI agent skills to improve code quality. It enables developers to identify and fix agent hallucinations and bugs rather than spending time troubleshooting. The platform requires no signup and provides a registry for submitting and testing agent skills. It targets software engineers working with AI agents who want to streamline development and produce higher-quality outputs.
written from the facts on this page · September 2026
From the sources
Tessl helps developers evaluate and optimize agent skills, so you focus on building with smarter AI agents instead of fixing bugs and hallucinations - no signup required ➡️ tessl.io/registry/skills/submit
Versioned, evaluated skills and context for agentic software development.
Bad skills burn tokens, produce wrong output, and send you back to square one. Catching those problems early saves you time and compute. Evaluate via a GitHub URL, or run it locally from your machine. Paste a public repo URL and Tessl will scan it automatically. The skill gets added to the open registry for others to find and install. Best for: Evaluating a public skill you have found on GitHub authored by other people. Adds to the public registry where other developers can find, install, and build on evaluated skills. Run a review directly in your terminal. Works with any local path, including private repos and work-in-progress skills. Best for: Local skills, private repos, or…from tessl.io
In the maker’s words, at launch
I'm Guy, the founder behind Snyk — now building Tessl, a package manager for agent skills. We’ve recently witnessed that most teams still treat skills as static artifacts: markdown files, created or copied from repo to repo. This approach offers a strong initial boost, but quickly creates debt: - Skills are…
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