List of the Top 7 AI Agent Frameworks for Model Context Protocol (MCP) in 2026

Mastra is a developer-friendly TypeScript framework designed to create advanced AI agents that can perform tasks, manage knowledge bases, and persist memory within workflows. By utilizing TypeScript, Mastra offers a robust solution for building scalable AI agents with full control over task execution, user interactions, and data storage. Developers can create intelligent agents that remember past interactions and make informed decisions based on real-time data, making Mastra a perfect tool for building everything from AI assistants to sophisticated automation systems. Its easy setup, scalability, and powerful integration features ensure efficient development cycles for AI-powered solutions.

Koog is a framework built on Kotlin that aims to facilitate the creation and execution of AI agents, ranging from simple ones that process single inputs to complex workflow agents that employ specific strategies and configurations. With its architecture entirely crafted in Kotlin, it seamlessly integrates the Model Control Protocol (MCP) to enhance model management. The framework also incorporates vector embeddings to enable effective semantic searches and provides a flexible system for developing and refining tools capable of interacting with outside systems and APIs. Ready-made components address common challenges faced in AI engineering, while advanced history compression techniques help minimize token usage and preserve context. Furthermore, a powerful streaming API allows for real-time response handling and multiple tool activations concurrently. Agents are equipped with persistent memory, which permits them to store knowledge across various sessions and among different agents, while comprehensive tracing capabilities improve debugging and monitoring, giving developers valuable insights for optimization. The diverse functionalities of Koog make it an all-encompassing solution for developers eager to leverage AI's potential in their projects, ultimately leading to more innovative and effective applications. Through its unique blend of features, Koog stands out as a vital resource in the ever-evolving landscape of AI development.

AgentKit provides a comprehensive suite of tools designed to streamline the development, deployment, and refinement of AI agents. At the heart of this platform is Agent Builder, a user-friendly visual interface that enables developers to construct multi-agent workflows effortlessly through a drag-and-drop system, implement necessary guardrails, preview running processes, and oversee various versions of workflows. The Connector Registry is essential for consolidating the management of data and tool integrations across multiple workspaces, thereby facilitating effective governance and access control. Furthermore, ChatKit allows for the smooth incorporation of interactive chat interfaces, which can be customized to align with specific branding and user experience needs, into both web and app environments. To maintain optimal performance and reliability, AgentKit enhances its evaluation framework with extensive datasets, trace grading, automated prompt optimization, and support for third-party models. In addition, it provides reinforcement fine-tuning options that further augment the capabilities of agents and their features. This extensive collection of tools empowers developers to efficiently craft advanced AI solutions, ultimately fostering innovation in the field. Overall, AgentKit stands as a pivotal resource for those looking to advance AI technology.

The Claude Agent SDK is an all-encompassing toolkit designed for developers interested in crafting autonomous AI agents that harness Claude's functionalities, enabling them to perform practical tasks that go beyond simple text generation by interacting directly with various files, systems, and tools. This SDK is built upon the same foundational infrastructure as Claude Code, which includes an agent loop, context management, and integrated tool execution, and it is available for developers using both Python and TypeScript. By utilizing this toolkit, developers can design agents that have the ability to read and write files, execute shell commands, perform web searches, amend code, and automate complex workflows without needing to construct these capabilities from scratch. Furthermore, the SDK guarantees that agents retain a continuous context and state during their interactions, thus allowing them to operate seamlessly, navigate intricate multi-step challenges, take suitable actions, validate their outcomes, and adjust their strategies until their tasks are accomplished. This makes the SDK an essential asset for anyone looking to optimize and elevate the functionality of AI agents across a wide array of applications. The flexibility and power of this toolkit empower developers to innovate and push the boundaries of what autonomous agents can achieve.

AG-UI is a streamlined and open protocol designed for event-driven communication, providing a standardized way for AI agents to connect with user-centric applications. Its architecture prioritizes user-friendliness and flexibility, enabling effortless integration among AI agents, real-time user contexts, and diverse user interfaces. This protocol significantly improves the interaction between agents and humans by allowing backend systems to produce events that conform to AG-UI’s established event categories during the operations of the agents, as well as accepting simple inputs that are compatible with AG-UI. AG-UI functions effectively with various event transport mechanisms, including Server-Sent Events (SSE), WebSockets, webhooks, and additional streaming methodologies, featuring a versatile middleware component that ensures compatibility across multiple environments. Furthermore, AG-UI's integration of agents into applications focused on user engagement enriches the overall agent-centric protocol framework: while MCP provides agents with crucial functionalities, A2A promotes communication among agents, and AG-UI specifically connects agents to user interfaces. By adopting this holistic strategy, AG-UI plays a vital role in fostering enhanced interactions between users and AI technologies, ultimately paving the way for more intuitive user experiences. The adoption of AG-UI marks a significant step forward in the evolution of human-AI collaboration.

assistant-ui is an open-source toolkit for React specifically designed to facilitate the development of AI chat applications in a production environment, with the goal of mirroring the intuitive user experience of ChatGPT in your projects. This comprehensive toolkit allows developers to quickly create visually appealing, enterprise-grade AI chat interfaces in mere minutes, suitable for various platforms including React, React Native, and terminal applications. Whether you're working on an alternative to ChatGPT, a customer support chatbot, an AI-based assistant, or a complex multi-agent system, assistant-ui provides vital frontend components and state management tools that enable you to focus on the unique features of your application. Featuring a ready-to-use chat user interface with attractive and customizable layouts, the toolkit greatly accelerates the process of concept development. Its chat state management is adeptly engineered to support smooth streaming responses, effectively manage interruptions, retries, and multi-turn conversations, while maintaining optimal rendering performance. Built with an emphasis on speed and efficiency, assistant-ui employs advanced rendering strategies and a small bundle size, ensuring that AI chat interfaces remain agile, even in high-demand scenarios. Furthermore, the modular architecture facilitates effortless integration and customization, providing developers with the flexibility needed to enrich their applications with robust AI chat functionalities. Overall, assistant-ui stands out as a powerful resource for anyone aiming to elevate their application's interactive capabilities through AI-driven chat solutions.

OpenLegion acts as a sophisticated framework and platform for AI agents, specifically crafted to help assemble an AI workforce that meets your unique requirements. With straightforward commands such as "I want a marketing agency," "I want a sales team," or "I want a research desk," OpenLegion adeptly organizes an agent stack that includes predefined roles, budget distributions, permissions, and secure management of credentials. Unlike mere chat functions, OpenLegion is designed for intricate workflows; its agents can browse the internet, fill out forms, write and run code, send emails and messages, organize files and folders, conduct research and summary tasks, scrape data, evaluate potential sales leads, manage spreadsheet data, oversee social media activities, track changes, and trigger workflows on platforms such as Slack, Telegram, or Discord. Each agent operates within a separate, secure container, which guarantees individualized budgets, specific tool access, continuous memory, skills aligned with MCP, and secure credentials that remain inaccessible to the agents themselves. This comprehensive architecture not only bolsters security but also promotes smooth interactions among agents, thereby enhancing efficiency across multiple business operations. The ability to customize and scale the workforce as needed further solidifies OpenLegion’s value in modern business environments.