> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.instabase.com/flow/using-custom-functions/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.instabase.com/_mcp/server.

# Using custom functions

> Python custom functions in flows, shared packages, LLM calls from flow UDFs, and the Text Editor.

Enterprise Single-tenant

Flow supports using custom functions, also called user-defined functions (UDFs) in various ways to extend your flows.

* [Custom functions in flow](/flow/custom-functions/custom-functions-flow) -- Learn about using custom functions in flows.

* [Publishing developer packages](/flow/custom-functions/dev-packages) --  Create reusable function libraries that can be published and shared across solutions within the organization.

* [Calling LLMs from custom functions in flows](/flow/custom-functions/llms-custom-functions) -- Call LLMs from custom functions in flow steps and events that support UDFs.

* [Text editor](/flow/custom-functions/text-editor) -- Work with and edit your custom function files in the built-in editor.

> Python custom functions in flows, shared packages, LLM calls from flow UDFs, and the Text Editor.

## Docs

- [Custom functions in flow](https://docs.instabase.com/flow/custom-functions/custom-functions-flow.md): Add custom functionality to your flow.
- [Publishing developer packages](https://docs.instabase.com/flow/custom-functions/dev-packages.md): Developer packages enable distribution and sharing of custom Python files used in flows, such as functions and libraries.
- [Calling LLMs from custom functions in flows](https://docs.instabase.com/flow/custom-functions/llms-custom-functions.md): Call an LLM from Python in flow legacy scripts using CLIENTS.llm_client, registration, and step configuration on single-tenant deployments.
- [Using the text editor](https://docs.instabase.com/flow/custom-functions/text-editor.md): Basic editing, templates, and debugging tools for working with files.