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Andrew Heard
7828d410ba
Add function calling (tool calling) support to GeminiLanguageModel
conforming to Apple's FoundationModels framework.
* Add .toolCalling capability to GeminiLanguageModel.
* Translate FoundationModels ToolDefinition into Gemini Tool and
FunctionDeclaration using OpenAPI parametersJsonSchema.
* Map GenerationOptions.ToolCallingMode (.allowed, .required,
.disallowed) to Gemini FunctionCallingConfig.Mode.
* Stream function calls in GeminiLanguageModelExecutor, forwarding
JSON-encoded arguments or empty fallback "{}" into channel actions.
* Translate Transcript tool calls and tool outputs into Gemini Content
parts, preserving thought signatures from reasoning models and
flushing buffered reasoning thoughts cleanly.
* Unpack structured tool responses and wrap scalar text tool outputs
under the result field.
* Support parameterless tools with empty arguments across request
schema translation, model response handling, and transcript history.
* Add unit tests across GeminiLanguageModel, GeminiRequestTranslator,
and GeminiTranscriptTranslator.
* Add end-to-end integration tests covering single-turn, sequential,
parallel, disallowed, parameterless, and reasoning tool calling
across all supported backends.