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

# Current capabilities

> What Sutro supports today and where important limits remain.

# Current capabilities

Sutro is one product for building and running Functions. **Functions** is where
you build and improve them. **Batch** runs them asynchronously at scale. A
published Function cannot currently be invoked by name through a synchronous
Sutro endpoint. For real-time use, copy its optimized prompt, output schema,
and model recommendation into your own OpenAI-compatible provider.

| Capability           | Functions | Batch       | Real-time serving                                   |
| -------------------- | --------- | ----------- | --------------------------------------------------- |
| Text inputs          | ✅         | ✅           | Use the copied prompt and schema with your provider |
| Image and PDF inputs | ✅         | Coming soon | Depends on your provider                            |
| Web search           | ✅         | Coming soon | Depends on your provider                            |
| Custom tool calling  | ✅¹        | Coming soon | Depends on your provider                            |

`✅` means available today.

<Note>
  ¹ Tool calling while building a Function requires the relevant tools to be
  configured for your Sutro deployment. Build-time web search and tools do not
  carry into Batch execution.
</Note>

## Data and assets

* Datasets: CSV, JSON, JSONL, and Parquet
* Function assets: PNG, JPEG, WebP, and PDF
* Batch files: CSV, Parquet, and TXT locally; CSV or Parquet by HTTPS URL
* Function asset limits: images up to 5 MB; PDFs up to 32 MB and 100 pages