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MCP Reference Servers: What 90,000 Stars and 16 Language SDKs Reveal About Agent Tool Boundaries

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The Model Context Protocol repository sits at 90,950 stars with 16 language SDKs and a collection of reference servers that expose how agent-tool boundaries actually work. These are not production systems. They are educational implementations that reveal transport layer choices, security boundaries, and SDK design patterns across C#, Go, Java, Kotlin, PHP, Python, Ruby, Rust, Swift, and TypeScript. The plumbing matters because every agent framework needs to solve the same problem: how do you let an LLM call tools without leaking credentials, crashing on malformed input, or creating a maintenan

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