AI-assisted coding

marimo is an AI-native editor, with support for full-cell AI code generation:

• generating new cells from a prompt
• refactoring existing cells from a prompt
• generating entire notebooks

as well as inline autocompletion (like GitHub Copilot).

marimo's AI assistant is specialized for working with data: unlike traditional assistants that only have access to the text of your program, marimo's assistant has access to the values of variables in memory, letting it code against your dataframe and database schemas.

This guide provides an overview of these features and how to configure them.

Locating your marimo.toml config file

Various instructions in this guide refer to the marimo.toml configuration file. Locate this file with marimo config show | head.

Generating cells with AI

marimo has built-in support for generating and refactoring code with LLMs. marimo works with hosted AI providers, such as OpenAI, Anthropic, and Google, as well as local models served via Ollama.

Enabling AI code generation. To enable AI code generation, first install required dependencies through the notebook settings.

Install required dependencies for AI generation through the notebook settings.

Then configure your LLM provider through the AI tab in the settings menu; see the section on connecting your LLM for detailed instructions.

Variable context

marimo's AI assistant has your notebook code as context. You can additionally pass variables and their values to the assistant by referencing them by name with @. For example, to include the columns of a dataframe df in your prompt, write @df.

Pass variables to your prompt by tagging them with `@`.

Refactor existing cells

Make edits to an existing cell by hitting Ctrl/Cmd-shift-e, which opens a prompt box that has your cell's code as input.

Use AI to modify a cell by pressing `Ctrl/Cmd-Shift-e`.

Generate new cells

Generate with AI button

At the bottom of every notebook is a button titled "Generate with AI". Click this button to add entirely new cells to your notebook.

Chat panel

The chat panel on the left sidebar lets you chat with an LLM and ask questions aboutyour notebook. The LLM can also generate code cells that you can insert into your notebook.

The chat panel currently supports the following modes:

• Ask: Enables read-only AI tools and tools from added MCP Client servers for context gathering, allowing the assistant to inspect your notebooks
• Manual: No tool access; the AI responds based only on the conversation and manually injected context

See the chat panel in action

Generating entire notebooks

Generate entire notebooks with marimo new PROMPT at the command-line; see the text-to-notebook docs to learn more.

Custom rules

You can customize how the AI assistant behaves by adding rules in the marimo settings. These rules help ensure consistent code generation across all AI providers. You can find more information about marimo's supported plotting libraries and data handling in the plotting guide and working with data guide.

Configure custom AI rules in settings

For example, you can add rules about:

• Preferred plotting libraries (matplotlib, plotly, altair)
• Data handling practices
• Code style conventions
• Error handling preferences

Example custom rules:

Use plotly for interactive visualizations and matplotlib for static plots
Prefer polars over pandas for data manipulation due to better performance
Include docstrings for all functions using NumPy style
Use Type hints for all function parameters and return values
Handle errors with try/except blocks and provide informative error messages
Follow PEP 8 style guidelines
When working with data:
- Use altair, plotly for declarative visualizations
- Prefer polars over pandas
- Ensure proper error handling for data operations
For plotting:
- Use px.scatter for scatter plots
- Use px.line for time series
- Include proper axis labels and titles
- Set appropriate color schemes

Connecting to an LLM

You can connect to an LLM through the notebook settings menu, or by manually editing your marimo.toml configuration file. Prefer going through the notebook settings menu.

You can configure the following providers:

• OpenAI
• Anthropic
• AWS Bedrock
• Google AI
• GitHub
• Ollama
• and any OpenAI-compatible provider

See the llm_providers guide for detailed instructions on how to configure each provider.

Agents

Experimental: Agents

marimo also supports external AI agents like Claude Code and Gemini CLI that can interact with your notebooks. Learn more in the agents guide.

Copilots

Copilots allow you to tab-complete code based on your notebook's context, similar to editors like Cursor.

GitHub Copilot

The marimo editor natively supports GitHub Copilot, an AI pair programmer, similar to VS Code:

1. Install Node.js.
2. Enable Copilot via the settings menu in the marimo editor.

Follow these instructions.

GitHUb Copilot is not yet available in our conda distribution; please install marimo using pip/uv if you need Copilot.

Windsurf Copilot

Windsurf (formerly codeium) provides tab-completion tooling that can also be used from within marimo.

To set up Windsurf:

1. Go to windsurf.com website and sign up for an account.
2. Download the Windsurf app.
3. After installing Windsurf and authenticating, open up the command palette, via cmd+shift+p, and ask it to copy the api key to your clipboard.

4a. Configure the UI settings in the editor to use Windsurf.

4b. Alternatively you can also configure the api key from the marimo config file.

marimo.toml

[completion]
copilot = "codeium"
codeium_api_key = ""

Custom copilots

marimo also supports integrating with custom LLM providers for code completion suggestions. This allows you to use your own LLM service to provide in-line code suggestions based on internal providers or local models (e.g. Ollama). You may also use OpenAI, Anthropic, Google, or any other providers by providing your own API keys and configuration.

To configure a custom copilot:

1. Ensure you have an LLM provider that offers API access for code completion (either external or running locally)
2. Add the following configuration to your marimo.toml (or configure in the UI settings in the editor):

marimo.toml

[ai.models]
autocomplete_model = "provider/model-name"

[completion]
copilot = "custom"

The configuration options include:

• autocomplete_model: The specific model to use for inline autocompletion.
• copilot: The name of the copilot to use for code generation.