Builtin Tool Authoring Guide A builtin tool is a package the agent runtime can call. It ships five faces : | Face | Lives in | Audience | | -------------------- | -------------------------------------------------------------------------------------- | ------------------------------------- | | Manifest + types | | The LLM (tool spec + system prompt) | | ExecutionRuntime | | Server / desktop / any runtime caller | | Executor | | Frontend (wraps stores/services) | | Client UI | | Chat UI | | Registry wiring | + | Framework | --- Read These First | Question | Doc | | -----------------------------…