Agent Skills

Official

pdf

Official Anthropic skill for extracting, filling and merging PDFs. Its LICENSE.txt forbids copying outside Anthropic's own services: card + link, no vendored body.

License: Proprietary (Anthropic ToS) — source-available, not redistributable

Official

docx

Official Anthropic skill for creating and editing Word documents. Same source-available terms as pdf: we point to the source, we don't copy the SKILL.md.

License: Proprietary (Anthropic ToS) — source-available, not redistributable

Official

xlsx

Official Anthropic skill for Excel workbooks. Proprietary LICENSE.txt: no redistribution, card + URL only.

License: Proprietary (Anthropic ToS) — source-available, not redistributable

Official

pptx

Official Anthropic skill for PowerPoint presentations. Source-available, not open source: outbound link, no gray-area copy.

License: Proprietary (Anthropic ToS) — source-available, not redistributable

Official

skill-creator

Official skill for creating, iterating on and evaluating other skills (evals, variance, an actionable description). Apache-2.0: body vendored with Anthropic's copyright.

License: Apache-2.0

---
name: skill-creator
description: Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, 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.
---
<!--
Copyright 2026 Anthropic, PBC.
Lic…

Official

mcp-builder

Official guide for building an MCP server (FastMCP or the TypeScript SDK): tools, schemas, actionable errors, evals. Apache-2.0, scripts/ not copied.

License: Apache-2.0

---
name: mcp-builder
description: 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).
license: Complete terms in LICENSE.txt
---
<!--
Copyright 2026 Anthropic, PBC.
Licensed…

Official

frontend-design

Aesthetic direction for a UI that doesn't look like a template: typography, rhythm, deliberate choices. Apache-2.0.

License: Apache-2.0

---
name: frontend-design
description: Guidance for distinctive, intentional visual design when building new UI or reshaping an existing one. Helps with aesthetic direction, typography, and making choices that don't read as templated defaults.
license: Complete terms in LICENSE.txt
---
<!--
Copyright 2026 Anthropic, PBC.
Licensed under the Apache License, Version 2.0.
Source: https://github.com/an…

Official

web-artifacts-builder

Official suite for multi-component HTML artifacts (React, Tailwind, shadcn). Apache-2.0; the init/bundle scripts stay on GitHub.

License: Apache-2.0

---
name: web-artifacts-builder
description: Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui). Use for complex artifacts requiring state management, routing, or shadcn/ui components - not for simple single-file HTML/JSX artifacts.
license: Complete terms in LICENSE.txt
---
<!--
Copyright 2026 Ant…

Official

canvas-design

Design philosophies translated into static visuals (.png, .pdf). Apache-2.0. Don't copy an existing artist's work.

License: Apache-2.0

---
name: canvas-design
description: Create beautiful visual art in .png and .pdf documents using design philosophy. You should use this skill when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists' work to avoid copyright violations.
license: Complete terms in LICENSE.txt
---
<!--
Copyright 2026 Anthropic,…

Official

algorithmic-art

Algorithmic art in p5.js: seeds, parameters, computational philosophies. Apache-2.0. Original, not a pastiche.

License: Apache-2.0

---
name: algorithmic-art
description: Creating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users request creating art using code, generative art, algorithmic art, flow fields, or particle systems. Create original algorithmic art rather than copying existing artists' work to avoid copyright violations.
license: Complete terms in LICENSE.t…

Official

cursor-skills

Cursor's documentation for Agent Skills (`.cursor/skills/` directories, the `paths` / `icon` extras). Proprietary: no vendored SKILL.md.

License: Cursor docs — link-out only

Shamalo example

concevoir-une-experience

Shamalo example: scoping an experiment before building it (hypothesis, metric, MDE, n, duration, SRM).

License: MIT

---
name: concevoir-une-experience
description: Cadre une expérience A/B avant de la coder — hypothèse, métrique primaire, MDE, n et durée. À utiliser quand quelqu’un veut « juste lancer un test » sans plan.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Concevoir une expérience

Exemple Shamalo pour enseigner le format SKILL.md. Ce n’est pas une skill officielle.

## Q…

Shamalo example

rediger-un-skill

Shamalo example: writing a SKILL.md (name, an actionable description, progressive disclosure).

License: MIT

---
name: rediger-un-skill
description: Rédige un SKILL.md conforme à agentskills.io — name, description activable, divulgation progressive. À utiliser pour créer ou revoir une skill, pas pour un prompt jetable.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Rédiger un skill

Exemple Shamalo. Le format est le produit.

## Frontmatter (chargé pour toutes les skills)

- `…

Shamalo example

analyser-un-srm

Shamalo example: reading a Sample Ratio Mismatch before looking at any uplift.

License: MIT

---
name: analyser-un-srm
description: Vérifie un Sample Ratio Mismatch avant de lire un uplift. À utiliser dès qu’un split observé ne colle pas à l’attendu, ou avant toute revue de résultats A/B.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Analyser un SRM

Exemple Shamalo. Un split cassé invalide tout ce qui suit.

## Entrées

- n observé par variante
- split attend…

Shamalo example

hypothese-cro

Shamalo example: turning a CRO hunch into a testable hypothesis.

License: MIT

---
name: hypothese-cro
description: Transforme une intuition CRO en hypothèse testable (si / alors / parce que, métrique, MDE). À utiliser quand le brief dit « on sent que le CTA est trop bas » sans prédiction.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Hypothèse CRO

Exemple Shamalo. Une hypothèse n’est pas un souhait.

## Forme

`Si [changement], alors [métrique]…

Shamalo example

plan-de-marquage

Shamalo example: a tracking plan (event, properties, owner) before opening GTM.

License: MIT

---
name: plan-de-marquage
description: Rédige un plan de marquage analytics (événement, propriétés, owner, page). À utiliser avant d’ouvrir GTM ou un SDK, pas après avoir déjà tout poussé en prod.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Plan de marquage

Exemple Shamalo. Un événement sans owner n’existe pas.

## Une ligne par événement

| Champ | Règle |
| --- |…

Shamalo example

brief-landing

Shamalo example: a landing page brief (audience, offer, proof, CTA, out of scope).

License: MIT

---
name: brief-landing
description: Cadre un brief de landing (audience, offre, preuve, CTA, hors-scope). À utiliser avant de designer ou de rédiger une page d’acquisition.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Brief landing

Exemple Shamalo. Une landing sans offre n’est qu’une homepage raccourcie.

## Cinq blocs, dans l’ordre

1. **Audience** — qui arrive, de…

Shamalo example

revue-resultats-ab

Shamalo example: reading an A/B test after its planned end — lift and confidence interval, not an "89% winner".

License: MIT

---
name: revue-resultats-ab
description: Lit un A/B après la fin prévue — lift, IC, significativité pratique. À utiliser pour une revue de résultats, jamais pour peek un test en cours.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Revue de résultats A/B

Exemple Shamalo. Une p-value n’est pas une décision.

## Ordre de lecture

1. Le test est-il allé au n et à la duré…

Shamalo example

boucle-growth-agent

Shamalo example: observe → hypothesis → deliverable → measure. One loop at a time.

License: MIT

---
name: boucle-growth-agent
description: Enchaîne observer → hypothèse → skill ou outil → mesure pour une boucle de growth assistée par agent. À utiliser pour cadrer un cycle, pas pour générer des idées en vrac.
license: MIT
metadata:
  author: shamalo
  origin: teaching-example
---

# Boucle growth × agent

Exemple Shamalo. L’agent accélère la boucle ; il ne choisit pas la métrique.

## Quatre …