AgentIndex icon
AgentIndex
bub logo
bub
★ 1.7k
vs
fast-agent logo
fast-agent
★ 3.9k

bub vs fast-agent

bub: Bub is a small Python agent runtime built on agents.md and Agent Skills, where every stage of a turn is a pluggy hook that plugins can override. Context is rebuilt from append-only tape records, and the same pipeline serves the CLI, Telegram and custom channels.; fast-agent: fast-agent is a CLI-first framework for building and interacting with sophisticated multimodal AI agents and workflows. It offers comprehensive support for various LLM providers, structured outputs, and vision, with unique features like MCP Feature support and live streaming responses to the terminal.

01

TL;DR

bub logo
bubDev Tooling · ★ 1.7k

Running an agent in a group chat shared by several people

Read bub full review →
fast-agent logo
fast-agentDev Tooling · ★ 3.9k

Rapid development and testing of sophisticated multimodal AI agents and workflows.

Read fast-agent full review →
02

Side-by-Side Comparison

Field
bub logobub
fast-agent logofast-agent
Category
Dev Tooling
Dev Tooling
Stars
★ 1.7k
★ 3.9k
License
Apache-2.0
Apache-2.0
Install Command
curl -fsSL https://bub.build/install.sh | bash
uv pip install fast-agent-mcp
Updated
2d ago
1d ago
Open Source
Yes
Yes
Website
↗ Visit
↗ Visit
GitHub
↗ GitHub
↗ GitHub
Tags
agent-runtime, python, plugins
acp, agent, agent-framework
03

Features

bub logobub
01Turn pipeline where every stage, from resolve_session to dispatch_outbound, is a replaceable hook
02Tape context rebuilt from append-only records, easy to inspect and replay
03One runtime across CLI chat, one-shot runs and a Telegram gateway
04Agent Skills discovery and plugin packaging through Python entry points
fast-agent logofast-agent
01Sophisticated multimodal Agent and Workflow creation.
02Comprehensive LLM provider support (e.g., Anthropic, OpenAI, Google, Ollama).
03Structured outputs, PDF, and Vision support.
04CLI-first with interactive terminal UI (TUI-style) and live streaming responses.
05Advanced agentic workflows like Chain, Parallel, MAKER, and Agents As Tools.
04

Use Cases

bub logobub
↳Running an agent in a group chat shared by several people
↳Building a custom agent by overriding only the prompt or model stage
↳Experimenting with replayable, auditable agent context
fast-agent logofast-agent
↳Rapid development and testing of sophisticated multimodal AI agents and workflows.
↳Diagnosing and tuning agent applications, including those requiring human input.
↳Implementing advanced agentic patterns for error reduction or complex task decomposition.
05

Best For

bub logobub
EssentialTrending
fast-agent logofast-agent
Trending
FAQ

FAQ

What is the difference between bub and fast-agent?
Both bub and fast-agent are in the Dev Tooling category. bub has 1.7k stars, while fast-agent has 3.9k stars.
Which is better, bub or fast-agent?
The best choice depends on your use case. Choose bub if Running an agent in a group chat shared by several people, and fast-agent if Rapid development and testing of sophisticated multimodal AI agents and workflows..
Is bub free or open source?
Yes, bub is open source on GitHub (Apache-2.0).
Is fast-agent free or open source?
Yes, fast-agent is open source on GitHub (Apache-2.0).
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Related

Alternatives to bub →Alternatives to fast-agent →bub details →fast-agent details →