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MR
MCP Reference Servers
by Anthropic
Official Model Context Protocol reference implementations.
MCP
Dev tools·open-source
ViewDeploy stateful, long-running agents with built-in persistence.
by LangChain
Production runtime for LangGraph agents. Streaming, persistence, human-in-the-loop, and native A2A-style agent-to-agent hand-offs. LangChain's flagship agent product.
by Anthropic
Official Model Context Protocol reference implementations.
by Google
Google's open protocol for agents speaking to agents.
by Composio
250+ tool integrations exposed as a single MCP server.