Developer Builds Two Rust CLIs to Query Self-Hosted Gemma 4 via HTTP and MCP
A developer has published a step-by-step guide detailing two small Rust command-line tools that send the same question to a self-hosted Gemma 4 language model using different protocols. The first tool, gemma-rust, calls the model's OpenAI-compatible HTTP endpoint directly and returns the raw JSON response. The second, gemma-rust-mcp, acts as an MCP client by launching a Python MCP server and querying the model through its tools, receiving markdown output instead of JSON. Both CLIs were tested against two deployments of the same model: a local setup using llama.cpp on a GTX 1650 Ti laptop GPU and a cloud deployment running vLLM on an NVIDIA L4 via Google Cloud Run. The project's primary goal is to demonstrate what an HTTP client sees versus what an agent-style MCP client receives, highlighting the practical difference between direct endpoint access and tool-mediated responses.
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