---
name: anthropic-skills
description: Use this skill when working with the Anthropic Skills API for document creation (pptx, xlsx, docx, pdf) via code execution containers.
model: us.anthropic.claude-sonnet-4-5-20250929-v1:0
---

# Anthropic Skills API

## Required Beta Headers

```
code-execution-2025-08-25
skills-2025-10-02
files-api-2025-04-14  (for file download)
```

## Pre-built Skill IDs

| Skill ID | Type |
|----------|------|
| `pptx` | PowerPoint |
| `xlsx` | Excel |
| `docx` | Word |
| `pdf` | PDF |

## Usage Pattern (TypeScript)

```typescript
import Anthropic from '@anthropic-ai/sdk'

const client = new Anthropic()

const response = await client.beta.messages.create({
  model: 'claude-sonnet-4-6',
  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 X' }],
  tools: [{ type: 'code_execution_20250825', name: 'code_execution' }],
})
```

## Extracting and Downloading Files

```typescript
// Extract file IDs from bash_code_execution_tool_result blocks
for (const item of response.content) {
  if (item.type === 'bash_code_execution_tool_result') {
    const contentItem = item.content
    if (contentItem.type === 'bash_code_execution_result' && contentItem.content) {
      for (const file of contentItem.content) {
        if ('file_id' in file) {
          const metadata = await client.beta.files.retrieveMetadata(file.file_id, {
            betas: ['files-api-2025-04-14'],
          })
          const dl = await client.beta.files.download(file.file_id, {
            betas: ['files-api-2025-04-14'],
          })
          const buffer = Buffer.from(await dl.arrayBuffer())
          await writeFile(metadata.filename, buffer)
        }
      }
    }
  }
}
```

## Handling pause_turn

Long operations return `stop_reason: 'pause_turn'`. Continue by appending `response.content` as an assistant message and re-sending with `container.id` from the previous response.

## Constraints

- No network access in containers
- No runtime package installation
- Max 8 skills per request
- Container reuse via `container.id`