AI Agent Development Framework and CLI Tool
3.7k 2026-04-18

evalstate/fast-agent

A flexible CLI-first framework for building, evaluating, and interacting with sophisticated AI agents and workflows, offering comprehensive LLM support and advanced debugging features.

Core Features

Flexible AI agent and workflow development
Comprehensive LLM provider support (OpenAI, Anthropic, Google, local models)
CLI-first interface with interactive TUI and shell integration
End-to-end MCP feature support and advanced transport diagnostics
Declarative syntax for prompt and server composition

Quick Start

uvx fast-agent-mcp@latest -x

Detailed Introduction

fast-agent is a powerful, CLI-first framework designed for the rapid development, evaluation, and deployment of AI agents and complex workflows. It provides a flexible environment for interacting with Large Language Models (LLMs) from various providers, including OpenAI, Anthropic, and Google, as well as local models. With its robust support for the Model Context Protocol (MCP) and Agent Context Protocol (ACP), fast-agent enables developers to build sophisticated multimodal agents, manage skills, and debug streamable HTTP transport with advanced diagnostics. Its declarative syntax and interactive terminal make it an efficient toolkit for creating effective AI applications.

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