# Get started with Agent Skills in the API

> Learn how to use Agent Skills to create documents with the Claude API in under 10 minutes.

This tutorial shows you how to use Agent Skills to create a PowerPoint presentation. You'll learn how to enable Skills, make a simple request, and access the generated file.

## Prerequisites

* [Anthropic API key](https://console.anthropic.com/settings/keys)
* Python 3.7+ or curl installed
* Basic familiarity with making API requests

## What are Agent Skills?

Pre-built Agent Skills extend Claude's capabilities with specialized expertise for tasks like creating documents, analyzing data, and processing files. Anthropic provides the following pre-built Agent Skills in the API:

* **PowerPoint (pptx)**: Create and edit presentations
* **Excel (xlsx)**: Create and analyze spreadsheets
* **Word (docx)**: Create and edit documents
* **PDF (pdf)**: Generate PDF documents

<Note>
**Want to create custom Skills?** See the [Agent Skills Cookbook](https://github.com/anthropics/claude-cookbooks/tree/main/skills) for examples of building your own Skills with domain-specific expertise.
</Note>

## Step 1: List available Skills

First, let's see what Skills are available. We'll use the Skills API to list all Anthropic-managed Skills:

<CodeGroup>

  import anthropic

  client = anthropic.Anthropic()

  # List Anthropic-managed Skills
  skills = client.beta.skills.list(
      source="anthropic",
      betas=["skills-2025-10-02"]
  )

  for skill in skills.data:
      print(f"{skill.id}: {skill.display_title}")

  import Anthropic from '@anthropic-ai/sdk';

  const client = new Anthropic();

  // List Anthropic-managed Skills
  const skills = await client.beta.skills.list({
    source: 'anthropic',
    betas: ['skills-2025-10-02']
  });

  for (const skill of skills.data) {
    console.log(`${skill.id}: ${skill.display_title}`);
  }

  curl "https://api.anthropic.com/v1/skills?source=anthropic" \
    -H "x-api-key: $ANTHROPIC_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -H "anthropic-beta: skills-2025-10-02"

</CodeGroup>

You see the following Skills: `pptx`, `xlsx`, `docx`, and `pdf`.

This API returns each Skill's metadata: its name and description. Claude loads this metadata at startup to know what Skills are available. This is the first level of **progressive disclosure**, where Claude discovers Skills without loading their full instructions yet.

## Step 2: Create a presentation

Now we'll use the PowerPoint Skill to create a presentation about renewable energy. We specify Skills using the `container` parameter in the Messages API:

<CodeGroup>

  import anthropic

  client = anthropic.Anthropic()

  # Create a message with the PowerPoint Skill
  response = client.beta.messages.create(
      model="claude-sonnet-4-5-20250929",
      max_tokens=4096,
      betas=["code-execution-2025-08-25", "skills-2025-10-02"],
      container={
          "skills": [
              {
                  "type": "anthropic",
                  "skill_id": "pptx",
                  "version": "latest"
              }
          ]
      },
      messages=[{
          "role": "user",
          "content": "Create a presentation about renewable energy with 5 slides"
      }],
      tools=[{
          "type": "code_execution_20250825",
          "name": "code_execution"
      }]
  )

  print(response.content)

  import Anthropic from '@anthropic-ai/sdk';

  const client = new Anthropic();

  // Create a message with the PowerPoint Skill
  const response = await client.beta.messages.create({
    model: 'claude-sonnet-4-5-20250929',
    max_tokens: 4096,
    betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
    container: {
      skills: [
        {
          type: 'anthropic',
          skill_id: 'pptx',
          version: 'latest'
        }
      ]
    },
    messages: [{
      role: 'user',
      content: 'Create a presentation about renewable energy with 5 slides'
    }],
    tools: [{
      type: 'code_execution_20250825',
      name: 'code_execution'
    }]
  });

  console.log(response.content);

  curl https://api.anthropic.com/v1/messages \
    -H "x-api-key: $ANTHROPIC_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
    -H "content-type: application/json" \
    -d '{
      "model": "claude-sonnet-4-5-20250929",
      "max_tokens": 4096,
      "container": {
        "skills": [
          {
            "type": "anthropic",
            "skill_id": "pptx",
            "version": "latest"
          }
        ]
      },
      "messages": [{
        "role": "user",
        "content": "Create a presentation about renewable energy with 5 slides"
      }],
      "tools": [{
        "type": "code_execution_20250825",
        "name": "code_execution"
      }]
    }'

</CodeGroup>

Let's break down what each part does:

* **`container.skills`**: Specifies which Skills Claude can use
* **`type: "anthropic"`**: Indicates this is an Anthropic-managed Skill
* **`skill_id: "pptx"`**: The PowerPoint Skill identifier
* **`version: "latest"`**: The Skill version set to the most recently published
* **`tools`**: Enables code execution (required for Skills)
* **Beta headers**: `code-execution-2025-08-25` and `skills-2025-10-02`

When you make this request, Claude automatically matches your task to the relevant Skill. Since you asked for a presentation, Claude determines the PowerPoint Skill is relevant and loads its full instructions: the second level of progressive disclosure. Then Claude executes the Skill's code to create your presentation.

## Step 3: Download the created file

The presentation was created in the code execution container and saved as a file. The response includes a file reference with a file ID. Extract the file ID and download it using the Files API:

<CodeGroup>

  # Extract file ID from response
  file_id = None
  for block in response.content:
      if block.type == 'tool_use' and block.name == 'code_execution':
          # File ID is in the tool result
          for result_block in block.content:
              if hasattr(result_block, 'file_id'):
                  file_id = result_block.file_id
                  break

  if file_id:
      # Download the file
      file_content = client.beta.files.download(
          file_id=file_id,
          betas=["files-api-2025-04-14"]
      )

      # Save to disk
      with open("renewable_energy.pptx", "wb") as f:
          file_content.write_to_file(f.name)

      print(f"Presentation saved to renewable_energy.pptx")

  // Extract file ID from response
  let fileId: string | null = null;
  for (const block of response.content) {
    if (block.type === 'tool_use' && block.name === 'code_execution') {
      // File ID is in the tool result
      for (const resultBlock of block.content) {
        if ('file_id' in resultBlock) {
          fileId = resultBlock.file_id;
          break;
        }
      }
    }
  }

  if (fileId) {
    // Download the file
    const fileContent = await client.beta.files.download(fileId, {
      betas: ['files-api-2025-04-14']
    });

    // Save to disk
    const fs = require('fs');
    fs.writeFileSync('renewable_energy.pptx', Buffer.from(await fileContent.arrayBuffer()));

    console.log('Presentation saved to renewable_energy.pptx');
  }

  # Extract file_id from response (using jq)
  FILE_ID=$(echo "$RESPONSE" | jq -r '.content[] | select(.type=="tool_use" and .name=="code_execution") | .content[] | select(.file_id) | .file_id')

  # Download the file
  curl "https://api.anthropic.com/v1/files/$FILE_ID/content" \
    -H "x-api-key: $ANTHROPIC_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -H "anthropic-beta: files-api-2025-04-14" \
    --output renewable_energy.pptx

  echo "Presentation saved to renewable_energy.pptx"

</CodeGroup>

<Note>
For complete details on working with generated files, see the [code execution tool documentation](/en/docs/agents-and-tools/tool-use/code-execution-tool#retrieve-generated-files).
</Note>

## Try more examples

Now that you've created your first document with Skills, try these variations:

### Create a spreadsheet

<CodeGroup>

  response = client.beta.messages.create(
      model="claude-sonnet-4-5-20250929",
      max_tokens=4096,
      betas=["code-execution-2025-08-25", "skills-2025-10-02"],
      container={
          "skills": [
              {
                  "type": "anthropic",
                  "skill_id": "xlsx",
                  "version": "latest"
              }
          ]
      },
      messages=[{
          "role": "user",
          "content": "Create a quarterly sales tracking spreadsheet with sample data"
      }],
      tools=[{
          "type": "code_execution_20250825",
          "name": "code_execution"
      }]
  )

  const response = await client.beta.messages.create({
    model: 'claude-sonnet-4-5-20250929',
    max_tokens: 4096,
    betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
    container: {
      skills: [
        {
          type: 'anthropic',
          skill_id: 'xlsx',
          version: 'latest'
        }
      ]
    },
    messages: [{
      role: 'user',
      content: 'Create a quarterly sales tracking spreadsheet with sample data'
    }],
    tools: [{
      type: 'code_execution_20250825',
      name: 'code_execution'
    }]
  });

  curl https://api.anthropic.com/v1/messages \
    -H "x-api-key: $ANTHROPIC_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
    -H "content-type: application/json" \
    -d '{
      "model": "claude-sonnet-4-5-20250929",
      "max_tokens": 4096,
      "container": {
        "skills": [
          {
            "type": "anthropic",
            "skill_id": "xlsx",
            "version": "latest"
          }
        ]
      },
      "messages": [{
        "role": "user",
        "content": "Create a quarterly sales tracking spreadsheet with sample data"
      }],
      "tools": [{
        "type": "code_execution_20250825",
        "name": "code_execution"
      }]
    }'

</CodeGroup>

### Create a Word document

<CodeGroup>

  response = client.beta.messages.create(
      model="claude-sonnet-4-5-20250929",
      max_tokens=4096,
      betas=["code-execution-2025-08-25", "skills-2025-10-02"],
      container={
          "skills": [
              {
                  "type": "anthropic",
                  "skill_id": "docx",
                  "version": "latest"
              }
          ]
      },
      messages=[{
          "role": "user",
          "content": "Write a 2-page report on the benefits of renewable energy"
      }],
      tools=[{
          "type": "code_execution_20250825",
          "name": "code_execution"
      }]
  )

  const response = await client.beta.messages.create({
    model: 'claude-sonnet-4-5-20250929',
    max_tokens: 4096,
    betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
    container: {
      skills: [
        {
          type: 'anthropic',
          skill_id: 'docx',
          version: 'latest'
        }
      ]
    },
    messages: [{
      role: 'user',
      content: 'Write a 2-page report on the benefits of renewable energy'
    }],
    tools: [{
      type: 'code_execution_20250825',
      name: 'code_execution'
    }]
  });

  curl https://api.anthropic.com/v1/messages \
    -H "x-api-key: $ANTHROPIC_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
    -H "content-type: application/json" \
    -d '{
      "model": "claude-sonnet-4-5-20250929",
      "max_tokens": 4096,
      "container": {
        "skills": [
          {
            "type": "anthropic",
            "skill_id": "docx",
            "version": "latest"
          }
        ]
      },
      "messages": [{
        "role": "user",
        "content": "Write a 2-page report on the benefits of renewable energy"
      }],
      "tools": [{
        "type": "code_execution_20250825",
        "name": "code_execution"
      }]
    }'

</CodeGroup>

### Generate a PDF

<CodeGroup>

  response = client.beta.messages.create(
      model="claude-sonnet-4-5-20250929",
      max_tokens=4096,
      betas=["code-execution-2025-08-25", "skills-2025-10-02"],
      container={
          "skills": [
              {
                  "type": "anthropic",
                  "skill_id": "pdf",
                  "version": "latest"
              }
          ]
      },
      messages=[{
          "role": "user",
          "content": "Generate a PDF invoice template"
      }],
      tools=[{
          "type": "code_execution_20250825",
          "name": "code_execution"
      }]
  )

  const response = await client.beta.messages.create({
    model: 'claude-sonnet-4-5-20250929',
    max_tokens: 4096,
    betas: ['code-execution-2025-08-25', 'skills-2025-10-02'],
    container: {
      skills: [
        {
          type: 'anthropic',
          skill_id: 'pdf',
          version: 'latest'
        }
      ]
    },
    messages: [{
      role: 'user',
      content: 'Generate a PDF invoice template'
    }],
    tools: [{
      type: 'code_execution_20250825',
      name: 'code_execution'
    }]
  });

  curl https://api.anthropic.com/v1/messages \
    -H "x-api-key: $ANTHROPIC_API_KEY" \
    -H "anthropic-version: 2023-06-01" \
    -H "anthropic-beta: code-execution-2025-08-25,skills-2025-10-02" \
    -H "content-type: application/json" \
    -d '{
      "model": "claude-sonnet-4-5-20250929",
      "max_tokens": 4096,
      "container": {
        "skills": [
          {
            "type": "anthropic",
            "skill_id": "pdf",
            "version": "latest"
          }
        ]
      },
      "messages": [{
        "role": "user",
        "content": "Generate a PDF invoice template"
      }],
      "tools": [{
        "type": "code_execution_20250825",
        "name": "code_execution"
      }]
    }'

</CodeGroup>

## Next steps

Now that you've used pre-built Agent Skills, you can:

<CardGroup cols={2}>
<Card title="API Guide" icon="book" href="/en/api/skills-guide">
Use Skills with the Claude API
</Card>

<Card title="Create Custom Skills" icon="code" href="/en/api/skills/create-skill">
Upload your own Skills for specialized tasks
</Card>

<Card title="Authoring Guide" icon="pen" href="/en/docs/agents-and-tools/agent-skills/best-practices">
Learn best practices for writing effective Skills
</Card>

<Card title="Use Skills in Claude Code" icon="terminal" href="/en/docs/claude-code/skills">
Learn about Skills in Claude Code
</Card>

<Card title="Agent Skills Cookbook" icon="book-open" href="https://github.com/anthropics/anthropic-cookbook/blob/main/skills/README.md">
Explore example Skills and implementation patterns
</Card>
</CardGroup>