Updates to README.md

* Adding details about document skills

* Adding partner skills section

.claude-plugin/marketplace.json

@@ -0,0 +1,43 @@
+{
+  "name": "anthropic-agent-skills",
+  "owner": {
+    "name": "Keith Lazuka",
+    "email": "klazuka@anthropic.com"
+  },
+  "metadata": {
+    "description": "Anthropic example skills",
+    "version": "1.0.0"
+  },
+  "plugins": [
+    {
+      "name": "document-skills",
+      "description": "Collection of document processing suite including Excel, Word, PowerPoint, and PDF capabilities",
+      "source": "./",
+      "strict": false,
+      "skills": [
+        "./document-skills/xlsx",
+        "./document-skills/docx",
+        "./document-skills/pptx",
+        "./document-skills/pdf"
+      ]
+    },
+    {
+      "name": "example-skills",
+      "description": "Collection of example skills demonstrating various capabilities including skill creation, MCP building, visual design, algorithmic art, internal communications, web testing, artifact building, Slack GIFs, and theme styling",
+      "source": "./",
+      "strict": false,
+      "skills": [
+        "./skill-creator",
+        "./mcp-builder",
+        "./canvas-design",
+        "./algorithmic-art",
+        "./internal-comms",
+        "./webapp-testing",
+        "./artifacts-builder",
+        "./slack-gif-creator",
+        "./theme-factory",
+        "./brand-guidelines"
+      ]
+    }
+  ]
+}

README.md

@@ -5,7 +5,7 @@ For more information, check out:
 - [What are skills?](https://support.claude.com/en/articles/12512176-what-are-skills)
 - [Using skills in Claude](https://support.claude.com/en/articles/12512180-using-skills-in-claude)
 - [How to create custom skills](https://support.claude.com/en/articles/12512198-creating-custom-skills)
-- [Equipping agents for the real world with Skills](https://anthropic.com/engineering/equipping-agents-for-the-real-world-with-skills)
+- [Equipping agents for the real world with Agent Skills](https://anthropic.com/engineering/equipping-agents-for-the-real-world-with-agent-skills)
 
 # About This Repository
 
@@ -13,6 +13,8 @@ This repository contains example skills that demonstrate what's possible with Cl
 
 Each skill is self-contained in its own directory with a `SKILL.md` file containing the instructions and metadata that Claude uses. Browse through these examples to get inspiration for your own skills or to understand different patterns and approaches.
 
+The example skills in this repo are open source (Apache 2.0). We've also included the document creation & editing skills that power [Claude's document capabilities](https://www.anthropic.com/news/create-files) under the hood in the [`document-skills/`](./document-skills/) folder. These are source-available, not open source, but we wanted to share these with developers as a reference for more complex skills that are actively used in a production AI application.
+
 **Note:** These are reference examples for inspiration and learning. They showcase general-purpose capabilities rather than organization-specific workflows or sensitive content.
 
 ## Disclaimer
@@ -42,6 +44,49 @@ This repository includes a diverse collection of example skills demonstrating di
 - **skill-creator** - Guide for creating effective skills that extend Claude's capabilities
 - **template-skill** - A basic template to use as a starting point for new skills
 
+# Document Skills
+
+The `document-skills/` subdirectory contains skills that Anthropic developed to help Claude create various document file formats. These skills demonstrate advanced patterns for working with complex file formats and binary data:
+
+- **docx** - Create, edit, and analyze Word documents with support for tracked changes, comments, formatting preservation, and text extraction
+- **pdf** - Comprehensive PDF manipulation toolkit for extracting text and tables, creating new PDFs, merging/splitting documents, and handling forms
+- **pptx** - Create, edit, and analyze PowerPoint presentations with support for layouts, templates, charts, and automated slide generation
+- **xlsx** - Create, edit, and analyze Excel spreadsheets with support for formulas, formatting, data analysis, and visualization
+
+**Important Disclaimer:** These document skills are point-in-time snapshots and are not actively maintained or updated. Versions of these skills ship pre-included with Claude. They are primarily intended as reference examples to illustrate how Anthropic approaches developing more complex skills that work with binary file formats and document structures.
+
+# Try in Claude Code, Claude.ai, and the API
+
+## Claude Code
+You can register this repository as a Claude Code Plugin marketplace by running the following command in Claude Code:
+```
+/plugin marketplace add anthropics/skills
+```
+
+Then, to install a specific set of skills:
+1. Select `Browse and install plugins`
+2. Select `anthropic-agent-skills`
+3. Select `document-skills` or `example-skills`
+4. Select `Install now`
+
+Alternatively, directly install either Plugin via:
+```
+/plugin install document-skills@anthropic-agent-skills
+/plugin install example-skills@anthropic-agent-skills
+```
+
+After installing the plugin, you can use the skill by just mentioning it. For instance, if you install the `document-skills` plugin from the marketplace, you can ask Claude Code to do something like: "Use the PDF skill to extract the form fields from path/to/some-file.pdf"
+
+## Claude.ai
+
+These example skills are all already available to paid plans in Claude.ai. 
+
+To use any skill from this repository or upload custom skills, follow the instructions in [Using skills in Claude](https://support.claude.com/en/articles/12512180-using-skills-in-claude#h_a4222fa77b).
+
+## Claude API
+
+You can use Anthropic's pre-built skills, and upload custom skills, via the Claude API. See the [Skills API Quickstart](https://docs.claude.com/en/api/skills-guide#creating-a-skill) for more.
+
 # Creating a Basic Skill
 
 Skills are simple to create - just a folder with a `SKILL.md` file containing YAML frontmatter and instructions. You can use the **template-skill** in this repository as a starting point:
@@ -70,3 +115,9 @@ The frontmatter requires only two fields:
 - `description` - A complete description of what the skill does and when to use it
 
 The markdown content below contains the instructions, examples, and guidelines that Claude will follow. For more details, see [How to create custom skills](https://support.claude.com/en/articles/12512198-creating-custom-skills).
+
+# Partner Skills
+
+Skills are a great way to teach Claude how to get better at using specific pieces of software. As we see awesome example skills from partners, we may highlight some of them here:
+
+- **Notion** - [Notion Skills for Claude](https://www.notion.so/notiondevs/Notion-Skills-for-Claude-28da4445d27180c7af1df7d8615723d0)

agent_skills_spec.md

@@ -0,0 +1,55 @@
+# Agent Skills Spec
+
+A skill is a folder of instructions, scripts, and resources that agents can discover and load dynamically to perform better at specific tasks. In order for the folder to be recognized as a skill, it must contain a `SKILL.md` file. 
+
+# Skill Folder Layout
+
+A minimal skill folder looks like this: 
+
+```
+my-skill/
+  - SKILL.md
+```
+
+More complex skills can add additional directories and files as needed.
+
+
+# The SKILL.md file
+
+The skill's "entrypoint" is the `SKILL.md` file. It is the only file required to exist. The file must start with a YAML frontmatter followed by regular Markdown. 
+
+## YAML Frontmatter
+
+The YAML frontmatter has 2 required properties:
+
+- `name`
+    - The name of the skill in hyphen-case
+    - Restricted to lowercase Unicode alphanumeric + hyphen
+    - Must match the name of the directory containing the SKILL.md
+- `description` 
+    - Description of what the skill does and when Claude should use it
+
+There are 3 optional properties:
+
+- `license`
+    - The license applied to the skill
+    - We recommend keeping it short (either the name of a license or the name of a bundled license file)
+- `allowed-tools` 
+    - A list of tools that are pre-approved to run
+    - Currently only supported in Claude Code
+- `metadata`
+    - A map from string keys to string values
+    - Clients can use this to store additional properties not defined by the Agent Skills Spec
+    - We recommend making your key names reasonably unique to avoid accidental conflicts
+
+## Markdown Body
+
+The Markdown body has no restrictions on it.
+
+# Additional Information
+
+For a minimal example, see the `template-skill` example.
+
+# Version History
+
+- 1.0 (2025-10-16) Public Launch