175 listed
Harnesses & SDKs
Frameworks and SDKs for building agents: the Claude Agent SDK, OpenAI Agents SDK, LangGraph, CrewAI and many more. Each page lists languages, packages, MCP and A2A support and how it orchestrates agents, with a link to the page every fact came from.
Showing 1–17 of 17
| Name | Language | Stars | Downloads / month (approx.) | MCP | A2A | Multi-agent |
|---|---|---|---|---|---|---|
| Strands Agents Open-source Python and TypeScript SDK for model-driven agents, with tools, MCP, multi-agent patterns and streaming. | Python, TypeScript | 8.9K | ~38.1M | Built in | Not stated | Yes |
| CopilotKit Open-source SDK that connects AI agents to app front ends with chat UI, generative UI, shared state and human approvals; creator of the AG-UI protocol. | TypeScript | 38.2K | ~1.2M | Built in | Not stated | — |
| trueforge Open-source agent harness that runs the model loop for you, with MCP tools, skills, sandboxing, approvals and a chat UI. | TypeScript | 6.4K | — | Built in | Not stated | Yes |
| ADK for TypeScript TypeScript toolkit for agents with Zod-typed tools, graph and multi-agent workflows, and Node.js or browser runtimes. | TypeScript | 1.4K | ~615.1K | Built in | Built in | Yes |
| BeeAI Framework Python and TypeScript framework for multi-agent systems, with MCP and A2A interop, YAML orchestration and OpenTelemetry tracing. | Python, TypeScript | 3.4K | ~23.3K | Built in | Built in | Yes |
| Deep Agents Opinionated agent harness on LangGraph with sub-agents, filesystem access, context management, persistent memory and approval of tool calls. | Python, TypeScript | 30.6K | ~8.3M | Built in | Not stated | Yes |
| Mastra TypeScript framework for AI agents and apps with graph-based workflows, memory, suspend-and-resume approvals, MCP servers and model routing. | TypeScript | 29.1K | ~6.2M | Built in | Not stated | — |
| Google Agent Development Kit (ADK) Open-source toolkit for building, evaluating and deploying agents in Python, TypeScript, Go, Java and Kotlin, tuned for Gemini but model-agnostic. | Python, TypeScript, Go, Java, Kotlin | 22K | ~10.1M | Built in | Not stated | Yes |
| Agent Squad Open-source framework that routes each user query to one of several AI agents, with Python, TypeScript and Swift runtimes. | Python, TypeScript, swift | 7.8K | ~6.5K | Built in | Not stated | Yes |
| VoltAgent TypeScript framework for AI agents with tools, memory, RAG, MCP and sub-agents, paired with a Cloud or self-hosted console. | TypeScript | 10.9K | — | Built in | Not stated | Yes |
| metorial Open-source access layer that connects AI agents to 1200+ integrations with shared auth, permissions and audit logs. | TypeScript, JavaScript, Python | 3.4K | ~1K | Built in | Not stated | — |
| Cloudflare Agents SDK TypeScript SDK for persistent AI agents on Cloudflare Durable Objects, with state sync, scheduling and MCP support. | TypeScript | 5.9K | — | Built in | Not stated | Yes |
| OpenAI Agents SDK (JavaScript) TypeScript and JavaScript framework for multi-agent workflows with tools, handoffs, guardrails, sandboxes and voice agents. | TypeScript, JavaScript | 3.9K | ~5.1M | Built in | Not stated | Yes |
| Stirrup Lightweight Python framework and starting template for agents that let the model choose its own approach to each task. | Python, TypeScript | 667 | ~279.7K | Built in | Not stated | — |
| code-mode TypeScript library that lets agents call MCP and UTCP tools by running model-written code in a sandbox. | TypeScript | 1.6K | — | Built in | Not stated | — |
| dexto Open agent harness for AI applications, with a YAML-configured coding agent, sessions, tools, MCP support and a CLI. | TypeScript | 657 | — | Built in | Not stated | Yes |
| Inngest AgentKit Framework for AI agents and multi-agent networks where a router picks which agent runs, with tools and MCP support. | TypeScript | 956 | ~52K | Built in | Not stated | Yes |