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The package manager for agent skills and context

Versioned, evaluated skills and context for agentic software development

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Featured skills

Install our featured skills or any skill from GitHub with Tessl package manager.

openai/skills

notion-knowledge-capture

Capture conversations and decisions into structured Notion pages; use when turning chats/notes into wiki entries, how-tos, decisions, or FAQs with proper linking.

anthropics/skills

mcp-builder

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

anthropics/skills

webapp-testing

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

planetscale/database-skills

mysql

Plan and review MySQL/InnoDB schema, indexing, query tuning, transactions, and operations. Use when creating or modifying MySQL tables, indexes, or queries; diagnosing slow/locking behavior; planning migrations; or troubleshooting replication and connection issues. Load when using a MySQL database.

openai/skills

notion-knowledge-capture

Capture conversations and decisions into structured Notion pages; use when turning chats/notes into wiki entries, how-tos, decisions, or FAQs with proper linking.

anthropics/skills

mcp-builder

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).

anthropics/skills

webapp-testing

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

planetscale/database-skills

mysql

Plan and review MySQL/InnoDB schema, indexing, query tuning, transactions, and operations. Use when creating or modifying MySQL tables, indexes, or queries; diagnosing slow/locking behavior; planning migrations; or troubleshooting replication and connection issues. Load when using a MySQL database.

Top performing skills & tiles

Discover more

Tessl analyzes skills and tiles for their impact on agent success.

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Pending

tessl/pypi-erlang-py

Erlang Binary Term Format for Python with encoding/decoding of Erlang/Elixir data structures

DOCS

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Pending

tessl/pypi-inquirer-textual

Inquirer based on Textual for creating interactive command-line user input prompts

DOCS

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Pending

tessl/pypi-oandapyv20

Python wrapper for the OANDA REST-V20 API enabling programmatic access to forex and CFD trading

DOCS

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Pending

tessl/pypi-agno

A lightweight library for building Multi-Agent Systems

DOCS

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Pending

tessl/pypi-metaflow

A human-centric Python framework for building and managing production-ready AI and ML systems with built-in experiment tracking, versioning, and cloud orchestration.

DOCS

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Pending

tessl/pypi-dlt

A Python-first scalable data loading library for building ELT pipelines with automatic schema inference and 20+ destination support.

DOCS

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Pending

tessl/pypi-openai-agents

Lightweight framework for building multi-agent workflows with LLMs, supporting handoffs, guardrails, tools, and 100+ LLM providers

DOCS

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Pending

tessl/pypi-deepeval

Comprehensive LLM evaluation framework with 50+ metrics for testing RAG, chatbots, and AI agents

DOCS

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Pending

tessl/pypi-kiln-ai

Kiln AI is a comprehensive platform for building, evaluating, and deploying AI systems with dataset management, model fine-tuning, RAG, and evaluation capabilities.

DOCS

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Pending

tessl/pypi-pyglet

Cross-platform windowing and multimedia library for Python with OpenGL graphics, event handling, and audio/video playback

DOCS

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Pending

tessl/pypi-opencv-python

Pre-built Python bindings for OpenCV, the comprehensive open-source computer vision and image processing library with 2500+ algorithms

DOCS

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Pending

tessl/pypi-zenml

ZenML is a unified MLOps framework that extends battle-tested machine learning operations principles to support the entire AI stack, from classical machine learning models to advanced AI agents.

DOCS

Can't find what you're looking for? Evaluate a missing skill, or if you're looking for agent context for an open source dependency, request a tile.

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From our partners

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Enterprise-ready skills from trusted publishers.

webapp-testing

Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.

SKILL

text-to-speech

Convert text to speech using ElevenLabs voice AI. Use when generating audio from text, creating voiceovers, building voice apps, or synthesizing speech in 74+ languages.

SKILL

cisco/software-security

A software security skill that integrates with Project CodeGuard to help AI coding agents write secure code and prevent common vulnerabilities. Use this skill when writing, reviewing, or modifying code to ensure secure-by-default practices are followed.

SKILLS

terraform-stacks

Comprehensive guide for working with HashiCorp Terraform Stacks. Use when creating, modifying, or validating Terraform Stack configurations (.tfcomponent.hcl, .tfdeploy.hcl files), working with stack components and deployments from local modules, public registry, or private registry sources, managing multi-region or multi-environment infrastructure, or troubleshooting Terraform Stacks syntax and structure.

SKILL

pubnub/pubnub-app-developer

Build real-time applications with PubNub pub/sub messaging

SKILLS

skill-creator

Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, update or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.

SKILL

hugging-face-tool-builder

Use this skill when the user wants to build tool/scripts or achieve a task where using data from the Hugging Face API would help. This is especially useful when chaining or combining API calls or the task will be repeated/automated. This Skill creates a reusable script to fetch, enrich or process data.

SKILL