The package manager for agent skills and context
Versioned, evaluated skills and context for agentic software development.
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Tessl helps you find, install, version, and evaluate the skills and context your coding agents rely on, so they behave consistently across tools and projects.
Used by Engineers at
Context can drive up to 3.3X improvement in agents use of over 300 libraries
How good is your skill? Put it to the test
Evaluate any skill against structured best practices for descriptions and content.
EVALUATE YOUR SKILL
Make agents successful in your environment
Agents don’t know how to develop in your organization, they need to be onboarded. Turn your APIs, libraries, and conventions into agent-usable skills, docs and rules, so agents stop guessing and start behaving like experienced team members.
- Version-matched OSS and internal APIs
- Correct imports, calls, and constraints
- Fewer retries and review cycles
Evaluate what works in real-world scenarios
Not all context is equal, and mistakes can mislead agents or overwhelm context windows. Evaluate and optimize your skills by running agents through real world scenarios, and testing changes to avoid regressions over time.
- Repeatable task evaluations
- Regression detection as skills, agents and models evolve
- Learn if your context helps or hurts agent performance
Create skills once. Use them across all agents and models
Tessl gives you a single source of truth for skills and context, reusable across agents, models, and development environments without duplication or drift.
- Avoid lock-in with universally compatible context
- Consistent behavior across agents
- Collaborate on context with your team and agents
Keep your agent on the rails with better context. Discover thousands of evaluated skills in the Tessl Registry.
Don’t take our word for it
Featured Articles
Explore our guides and resources to understand key concepts relating to Al agents.
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