Bub Agent Skill

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Bub it. Build it. A tiny agent runtime, composable with plugins.

Bub is an open-source agent skill by bubbuild, written mainly in Python, with 1,695 GitHub stars and the Apache-2.0 license. Its code was last updated Nov 1, 2026. The latest PyPI release is bub 0.6.1, published Nov 4, 2026.

Bub

<div align="center"> <picture> <source srcset="https://raw.githubusercontent.com/bubbuild/bub/refs/heads/main/website/src/assets/bub-logo-dark.png" media="(prefers-color-scheme: dark)"> <img alt="Bub logo" src="https://raw.githubusercontent.com/bubbuild/bub/refs/heads/main/website/src/assets/bub-logo.png" width="200"> </picture> <p><strong>Build your Bub.</strong></p>

Website · Docs · Hub

</div>

Put an agent in your own Python program, or customize the Bub application. The application uses the same agent kernel and adds configuration, plugins, and channel integration.

Build your own agent

Use bub.core.Agent to choose your model, tools, instructions, and conversation storage. The base bub package installs the kernel's dependencies.

In a Python 3.12+ project:

uv add bub

Run your first agent with the SDK guide, then serve it with FastAPI when you need an HTTP endpoint.

You can also embed BubAgent to reuse the application's settings and plugin hooks in your service. This uses bub[app]; Reuse the Bub app explains the integration choices and their requirements.

Customize the Bub app

Start a conversation, then add tools, skills, plugins, or channels for the work you want Bub to do.

Install on macOS or Linux:

curl -fsSL https://bub.build/install.sh | bash

On Windows:

powershell -ExecutionPolicy ByPass -c "irm https://bub.build/install.ps1 | iex"

Follow the prompts to choose plugins and configure your model, then start a conversation:

bub chat

Run your first conversation walks through a task in your workspace. To customize the Bub app, see tools, plugins, and packaging. For uv tool install and other setup options, see Install Bub.

Documentation

Background

License

Apache-2.0

Bub alternatives

View more →

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