MCP client SDK for Apple's on-device model dynamically builds Tools from JSON Schema

AdventurousKeys · reddit · 2026-08-27

A developer releases LocalLMLabSDKCore, a linkable MCP client SDK for Apple's on-device FoundationModels. v0.7 makes the MCP client a binary xcframework (Apache 2.0) with tool discovery, three auth types (none, PAT, OAuth with automatic DCR), and Keychain token storage. v0.8 adds MCPTool, which converts MCP server JSON Schema into FoundationModels DynamicGenerationSchema, eliminating manual adapter writing. Common JSON Schema subsets convert directly; complex constructs degrade to free-form strings. Example apps: repo-qa (minimal CLI), plate-today (old way), plate-today-tools (new way), workspace-buddy (coding agent example).

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