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Versioned, evaluated skills and context for agentic software development

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

anthropics/skills

pdf

Use this skill whenever the user wants to do anything with PDF files. This includes reading or extracting text/tables from PDFs, combining or merging multiple PDFs into one, splitting PDFs apart, rotating pages, adding watermarks, creating new PDFs, filling PDF forms, encrypting/decrypting PDFs, extracting images, and OCR on scanned PDFs to make them searchable. If the user mentions a .pdf file or asks to produce one, use this skill.

secondsky/claude-skills

systematic-debugging

Four-phase debugging framework that ensures root cause investigation before attempting fixes. Never jump to solutions. Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.

a-pavithraa/springboot-skills-marketplace

springboot-migration

Migrate Spring Boot projects to version 4.0 with Java 25, including Spring Modulith 2.0 and Testcontainers 2.x upgrades. Use when user requests upgrading Spring Boot, migrating to Java 25, updating dependencies to Spring Boot 4, mentions Jackson 3 migration, asks about starter renames (web→webmvc, aop→aspectj), fixing test annotations (@MockBean→@MockitoBean), or needs help with Spring Modulith 2.0 or Testcontainers 2.x compatibility. Analyzes codebase for migration issues and guides through changes with specific file references.

huggingface/skills

hugging-face-cli

Execute Hugging Face Hub operations using the `hf` CLI. Use when the user needs to download models/datasets/spaces, upload files to Hub repositories, create repos, manage local cache, or run compute jobs on HF infrastructure. Covers authentication, file transfers, repository creation, cache operations, and cloud compute.

anthropics/skills

pdf

secondsky/claude-skills

systematic-debugging

a-pavithraa/springboot-skills-marketplace

springboot-migration

huggingface/skills

hugging-face-cli

Top performing skills & tiles

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

tessl/npm-external-editor

Edit a string with the users preferred text editor using $VISUAL or $ENVIRONMENT

DOCS

tessl/npm-ulid

A universally-unique, lexicographically-sortable, identifier generator

DOCS

tessl/npm-coffeescript

A programming language that compiles into JavaScript, offering more concise and readable syntax while maintaining full JavaScript compatibility.

DOCS

tessl/npm-rest

RESTful HTTP client library with composable interceptor architecture for Node.js and browsers

DOCS

tessl/npm-anymatch

Matches strings against configurable strings, globs, regular expressions, and/or functions

DOCS

tessl/npm-acorn-jsx

JSX parsing plugin for the Acorn JavaScript parser that enables fast parsing of React JSX syntax

DOCS

tessl/npm-xmlhttprequest

XMLHttpRequest for Node.js that emulates the browser XMLHttpRequest object

DOCS

tessl/npm-store

A localStorage wrapper for all browsers without using cookies or flash, providing persistent client-side storage with automatic fallback and plugin architecture

DOCS

tessl/npm-stencil--core

A comprehensive web component compiler that transforms TypeScript and JSX code into standards-compliant web components with complete development toolchain.

DOCS

tessl/npm-mjml-head-font

MJML head component for importing custom fonts into email templates

DOCS

tessl/npm-lerna--init

Create a new Lerna repo or upgrade an existing repo to the current version of Lerna

DOCS

tessl/npm-vant

Mobile UI Components library built on Vue 3 with 100+ components

DOCS

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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