fast-agent

fast-agent is a coding agent and development toolkit designed to build, evaluate, and manage MCP-native agents, workflows, and servers.

fast-agent functions as a development toolkit for creating and managing MCP-native agents and workflows. It connects to Anthropic, Google, and OpenAI endpoints and supports local models via llama.cpp. Users attach MCP servers through configuration files or the command line to handle context and agent deployment. The platform provides tools for creating plugins and hooks using Python, as well as an API for integration. It enables control over context management through template-based system prompts, agent skills, and prompt files. Configurations are distributed and updated using Card Packs, ensuring standardized agent definitions across environments.

fast-agent at a glance

Best for: Software engineer
Runs on: CLI, API
Pricing: Free
Released: January 2025
Category: AI coding tool
Website: fast-agent.ai

Key features

Native support for Anthropic, Google, and OpenAI endpoints
Auto-configuration for llama.cpp hosted models
MCP and ACP server attachment and deployment
Plugin and hook development with Python
Template-based system prompt management
Agent definition and skill management
Configuration distribution via Card Packs

Use it for

Developing and evaluating AI agents
Managing agent workflows and server connections
Integrating MCP servers for improved context
Distributing agent configurations with Card Packs

Alternatives to fast-agent

FastMCP — The standard framework for building Model Context Protocol servers and clients.
Agent Toolkit for AWS — Provides official MCP servers and agent skills tailored for AWS services.
Magpie — It enables AI agents to use models not natively supported by their internal protocols.
FastGPT — It uses hybrid retrieval and auto-cleansed data to prevent hallucinations.
AGENTS.md — It separates agent-specific instructions from human-focused README files.
AG-UI — Standardizes agent-user interactions and generative UI for applications.
Composio — Equips AI agents with tools, managed user auth, and sandboxes across 1,500+ apps
Stagewise — Maintain full sovereignty over AI models while running agents in parallel.
Cortex Docs — Unifies API documentation, typed SDKs, and agent-ready MCP tools.
Google ADK — It applies software development principles to agent creation with Python.
Agent Native — Define capabilities once for the agent, UI, APIs, and integrations.
Coding Tools MCP — Turns any chat app into a coding agent with strict workspace safety boundaries.

All fast-agent alternatives