foundation-models is a Model Context Protocol (MCP) server that provides text generation capabilities by leveraging Apple's Foundation Models framework running on macOS. It enables MCP clients to perform private, on-device language model inference, ensuring user data does not leave the device. Implemented in Swift, it uses the MCP Swift SDK and adheres to the Model Context Protocol, with a focus on secure and private generation workflows. The server is designed to run on macOS 26.0 or later (macOS Tahoe) on Apple Silicon for best performance, and is built using standard Swift tooling (swift-argument-parser for CLI, swift-service-lifecycle for graceful startup/shutdown). Build from source via swift build -c release, producing the executable at .build/release/mcp-foundation-models. The README also describes how to wire the server into Claude Desktop via the mcpServers configuration, enabling seamless integration. It supports environment-based configuration through SYSTEM_INSTRUCTIONS to set default system prompts and DEBUG to enable verbose logging. Dependencies include swift-argument-parser, swift-sdk (MCP), and swift-service-lifecycle. The project is MIT-licensed, with a TODO for session history management.