> ## Documentation Index
> Fetch the complete documentation index at: https://surfacedocs.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Anthropic

> Generate documents with Claude using tool use

# Anthropic

Claude supports structured output via tool use. Pass `DOCUMENT_SCHEMA` as a tool's `input_schema` and force the model to use it with `tool_choice`.

```python theme={null}
from surfacedocs import SurfaceDocs, DOCUMENT_SCHEMA, SYSTEM_PROMPT
import anthropic

client = anthropic.Anthropic()
docs = SurfaceDocs()

response = client.messages.create(
    model="claude-sonnet-4-20250514",
    max_tokens=4096,
    system=SYSTEM_PROMPT,
    messages=[
        {"role": "user", "content": "Write documentation for user authentication"},
    ],
    tools=[{
        "name": "create_document",
        "description": "Create a structured document",
        "input_schema": DOCUMENT_SCHEMA,
    }],
    tool_choice={"type": "tool", "name": "create_document"},
)

# Extract the tool use block
tool_use = next(b for b in response.content if b.type == "tool_use")
result = docs.save(tool_use.input)
print(f"Saved: {result.url}")
```

<Note>
  Claude doesn't have a native `response_format` like OpenAI. Instead, we use tool use to enforce the schema. Setting `tool_choice` to the specific tool name guarantees Claude will output in the correct format.
</Note>

## How it works

1. `SYSTEM_PROMPT` tells Claude about the document format
2. `DOCUMENT_SCHEMA` is passed as a tool's input schema
3. `tool_choice` forces Claude to call the tool (guaranteeing structured output)
4. The tool use block's `input` contains the document data
5. Pass it directly to `docs.save()`