Model Context Protocol Server Frameworks

mcp-go is a Go implementation of the Model Context Protocol (MCP) providing an SDK and framework for building servers that connect large language model applications to external tools and data sources. It serves as a developer kit for implementing bidirectional communication and structured data exchange between AI clients and servers. The framework enables the creation of executable tools with structured output schemas, reusable prompt templates, and data resource exposure via URI templates. It supports multiple transport layers, including stdio, HTTP, and Server-Sent Events, using a transport-agnostic message bus to decouple protocol logic from the communication channel. The library includes capabilities for session-based context tracking, capability filtering, and handler middleware for logging and error recovery. It further provides observability through request tracing and lifecycle hooks, as well as security configurations for CORS and OAuth metadata exposure.

The Model Context Protocol C# SDK is a library for building clients and servers that implement the Model Context Protocol to integrate AI tools and resources. It provides an AI tool integration framework and a multi-modal content handler to exchange text, images, and binary resources between AI models and external context providers. The SDK utilizes a JSON-RPC communication library to manage bidirectional data exchange. It features a transport-agnostic communication layer that supports standard input and output, HTTP, and in-memory pipes, with specific integration for ASP.NET Core hosting. The framework covers tool and prompt management, including schema-driven tool generation and attribute-based capability discovery. It supports resource management via URI-template mapping, asynchronous task orchestration, and secure authorization workflows through token exchange and identity assertion.

mcp-use is a development framework designed for building, deploying, and managing servers, clients, and autonomous agents using the Model Context Protocol. It provides a comprehensive toolkit for creating servers that expose custom tools, data resources, and prompts to compatible AI agents. The project distinguishes itself by offering a complete lifecycle for protocol-based applications, including a dedicated hosting platform for production servers and a compliance validator to ensure servers meet marketplace publishing requirements. It also features an observability suite for tracing protocol traffic and a set of tools for generating the assets and metadata required for app store submissions. The framework covers broad capability areas including automated deployment pipelines with branch preview provisioning, comprehensive monitoring with latency and reliability analytics, and security via multi-tenant hosting and tool-level access control. It also includes UI integration for embedding customizable chat interfaces and widgets directly into applications. Development is supported through software development kits for TypeScript and Python, along with a command-line interface for project scaffolding and server boilerplate generation.

Model Context Protocol is a standardized framework for connecting large language models to external data sources and executable tools. It enables the creation of a universal interface where servers expose tools, resources, and prompts that can be discovered and utilized by various AI clients. The protocol utilizes a JSON-RPC message system that is transport-agnostic, supporting both standard input/output for local processes and HTTP with server-sent events for remote connections. It emphasizes security and control by delegating model sampling to the client to keep API keys secure from servers and requiring explicit user approval for tool execution on local systems. The system covers broad capabilities including agentic workflow orchestration, URI-based resource mapping for filesystem and database access, and the delivery of interactive HTML-based user interfaces. It also includes comprehensive support for asynchronous task management, enterprise identity integration via OAuth and SSO, and a registry system for server discovery and versioning. The project provides client and server SDKs, alongside automated scaffolding tools for generating project structures and server boilerplate.

kubectl-ai is a natural language cluster operator and AI command assistant that translates plain-text prompts into executable Kubernetes commands. It serves as an interface between large language models and the Kubernetes API to enable cluster management through conversational text. The project implements a Model Context Protocol server to expose cluster operations as standardized tools for external AI clients. It uses a provider-agnostic model interface to support both cloud-based and local AI backends. The system covers natural language infrastructure control and AI-assisted DevOps through dynamic command translation and a bridge to the standard command line interface. It extends operational capabilities via plugin-based tool execution and integration with external Model Context Protocol servers.

This project is a comprehensive suite of AI tools and frameworks, featuring an LLM multi-agent orchestrator, an autonomous agent runtime, and a stateful application framework. It provides the infrastructure to build and manage specialized AI agents capable of coordinating complex tasks through graph-based workflows and shared state. The system is distinguished by its implementation of the Model Context Protocol, allowing for standardized resource discovery and communication between AI clients and servers. It further includes an AI-powered documentation generator designed to analyze source code repositories and transform them into instructional tutorials. The codebase covers a broad range of capabilities, including web browser automation, sandboxed code execution, and asynchronous task processing. It provides tools for state management through conversation history tracking and progress checkpointing, as well as high-performance data storage using key-value and multi-dimensional array systems. The framework integrates API development utilities, including JSON-RPC communication, automated OpenAPI documentation, and a pub-sub message exchange for background job management.

Agent Zero is an autonomous AI agent framework designed to execute complex, multi-step workflows by managing its own environment, persistent memory, and external tool interactions. It functions as a Python-based automation library that enables agents to write code, execute terminal commands, and perform system-level tasks independently. The system is built to handle large-scale operations through hierarchical agent delegation, allowing for the coordination of subordinate agents to maintain focus and context. The platform distinguishes itself through a focus on secure, isolated execution and standardized integration. It utilizes a sandboxed environment for all system-level operations and incorporates a security-first approach to plugin management, automatically scanning external tools for vulnerabilities before deployment. By leveraging the Model Context Protocol, the framework provides a unified interface for connecting to external data sources and third-party tools, ensuring that agents can expand their functional capabilities while maintaining strict environment-based configuration isolation. The system supports a broad range of operational requirements, including persistent knowledge management, automated scheduling of recurring tasks, and secure credential handling. It provides tools for analyzing complex data and performing automated security assessments, ensuring that long-running tasks remain consistent and transparent. The framework is designed for developers to build and manage self-directed agents that operate within defined security boundaries.

Composio is an integration platform designed to connect autonomous agents with external software services and APIs. It functions as a tool orchestration framework and a middleware hub, providing a unified interface for managing the lifecycle, authentication, and execution of external tool definitions within agentic workflows. The platform distinguishes itself by utilizing the Model Context Protocol to standardize communication between artificial intelligence models and external data sources. It employs a provider-agnostic adapter pattern to decouple core logic from specific model providers and uses remote procedure call orchestration to route agent-generated function calls to external services through a centralized gateway. The system supports automated workflow orchestration, enabling the creation of complex task sequences across third-party business applications. It features dynamic tool discovery and session state management to maintain isolated execution environments, ensuring that agents have access to current service capabilities and authentication tokens during runtime. The project provides a software development kit that standardizes session creation and tool retrieval to facilitate integration within native development environments.

container-use is a containerized AI execution environment and code sandbox designed to provide a secure space for AI coding agents to execute commands and build applications. It functions as a workspace orchestrator that provisions isolated containers mapped to git branches, allowing multiple agents to operate in parallel without state conflicts or affecting the host system. The project serves as a Model Context Protocol server, bridging AI agents to containerized environments for standardized tool access. It enables a workflow for reviewing and merging changes made by agents within these isolated environments back into a local repository. The system includes capabilities for agentic workflow monitoring through command history logging and provides mechanisms for human intervention via direct terminal tunneling into active sessions. It further supports bidirectional file system syncing to facilitate the review and integration of agent-generated code.

This is an open-source framework for building stateful, durable AI agents that run on Cloudflare Workers. It provides a runtime for long-lived agents that maintain a persistent identity, local SQL storage, and real-time connections, utilizing a lifecycle where agents hibernate when idle and wake on demand. The project distinguishes itself through its multi-channel orchestration, allowing a single agent to be deployed across voice, email, and chat interfaces with unified state. It implements the Model Context Protocol for standardized tool and data exchange and includes a dedicated framework for monetizing agent tools via the x402 micropayment protocol. The system covers a broad range of capabilities, including browser automation for web page inspection, event-driven durable workflows with human-in-the-loop approvals, and bidirectional WebSocket communication for real-time state synchronization. It also features a secure TypeScript sandbox for executing generated code and distributed tracing for monitoring agent performance.

This project provides a translation layer and set of adapters designed to bridge AI agents with the Model Context Protocol. It functions as an integration layer that allows agents to operate as protocol-compliant servers and enables the conversion of protocol-based tools into formats compatible with agent frameworks and logic graphs. The adapters facilitate tool interoperability by wrapping external protocol tools for use within agent workflows and exposing internal agent capabilities to any client implementing the Model Context Protocol. This creates a communication bridge that supports inter-agent discovery and coordination through a standardized protocol. Beyond tool translation, the project covers the orchestration of agentic workflows, including stateful thread management, asynchronous execution, and real-time event streaming. It also incorporates support for OAuth 2.0 authentication, durable execution checkpointing, and the deployment of agents via Docker containers.

The BeeAI Framework is an LLM agent framework and multi-agent orchestration engine used to build autonomous agents that coordinate reasoning, tool execution, and complex workflows. It functions as a structured AI output controller and RAG integration library, providing a unified interface to manage multiple language model providers. The framework is distinguished by its implementation of the Model Context Protocol, allowing agents, tools, and models to be shared between different AI platforms and hosted as agentic tooling servers. It enables the design of collaborative agent teams through declarative YAML configurations, structured handoffs, and the ability to expose agents as services for external clients. The project covers a broad range of capabilities, including retrieval augmented generation with vector store integration, state-persistent memory management, and schema-driven output constraining using JSON schemas or Pydantic models. It also provides telemetry tracing for monitoring agent reasoning trajectories and execution interception for enforcing behavioral rules and human approval.

This project is a Python framework for building autonomous, event-driven agent systems. It provides a unified runtime for orchestrating multi-agent workflows, managing persistent conversation state, and executing code within secure, isolated sandbox environments. The framework is designed to handle complex task delegation, allowing agents to invoke other agents as tools while maintaining context across multi-turn interactions. The framework distinguishes itself through its deep integration with the Model Context Protocol, enabling agents to connect to external data sources and remote services using standardized communication protocols. It features a robust middleware-based guardrail system that intercepts inputs, outputs, and tool calls to enforce safety and quality constraints. Additionally, the platform includes specialized infrastructure for real-time voice AI development, supporting bidirectional streaming of audio and text with automatic interruption handling and low-latency session management. Beyond its core orchestration capabilities, the project provides comprehensive tools for observability, including distributed tracing and lifecycle event monitoring. It supports flexible tool integration through automatic schema generation from code signatures, as well as human-in-the-loop controls that allow for manual approval of agent actions. The system is designed to be extensible, with pluggable storage backends for session persistence and configurable execution environments that range from local processes to containerized workspaces.

Deepagents is an LLM agent orchestration platform and stateful application server designed for deploying and managing AI agents built with computational graphs. It provides a containerized runtime environment that handles agent execution, state persistence, and the versioning of AI assistants. The platform distinguishes itself through deep integration with the Model Context Protocol, allowing agents to function as servers that expose tools and capabilities to external clients. It features a sophisticated observability suite for capturing execution traces, performing LLM-based evaluations against datasets, and conducting side-by-side model output comparisons. The system covers a broad range of operational capabilities, including cron-based task scheduling, multi-tenant workspace isolation, and human-in-the-loop review workflows. It also manages long-term memory through semantic search and provides automated scaling of compute resources across cloud environments. A command-line interface is provided for local agent validation, graph packaging, and rapid testing via a local development server.

Hatchet is an open-source durable workflow engine and task orchestration platform. It provides a framework for building and executing fault-tolerant, multi-step pipelines as directed acyclic graphs (DAGs), with automatic retries, scheduling, and real-time observability. The system is built around durable task checkpointing, which persists execution state after each step so work can resume from the last checkpoint after a worker crash or restart, and it supports event-driven task resumption that pauses a task until a matching external event arrives. The platform distinguishes itself through its support for polyglot workers connected over gRPC, allowing task code to be written in any language and scaled independently from the orchestration services. It offers a comprehensive set of capabilities for modeling workflows as DAGs with typed data passing between dependent tasks, parallel execution, and conditional task skipping or cancellation based on parent output. Hatchet also provides a multi-step human-in-the-loop orchestrator that pauses workflows for human input or external events and resumes from checkpoints without custom recovery logic, and it exposes durable tasks as callable tools for AI agents through the Model Context Protocol (MCP) or SDKs with retries and observability. The system includes a web-based observability dashboard for monitoring workflow runs, logs, metrics, and traces with real-time status and debugging capabilities. It supports event-driven task execution triggered by external webhooks, Slack commands, and custom events, as well as scheduled and cron-based automation for running one-off or recurring tasks. Hatchet can be self-hosted on your own infrastructure using Kubernetes or Docker, with PostgreSQL as the primary state store and optional RabbitMQ for message queuing.