Andrew Heard 3796a55fdf feat(ai): add GeminiLanguageModel (#16601) ...

Implemented `GeminiLanguageModel`, providing an adapter for Google's
Gemini models conforming to Apple's `FoundationModels.LanguageModel`
protocol. This PR includes text to text generation capabilities; other
modalities and Gemini features will be handled in follow-up PRs.

**Note:** The `GeminiLanguageModel` implementation is guarded by the
environment variable `GEMINI_LANGUAGE_MODEL`. By default none of the
`GeminiLanguageModel` implementation is included.

Key additions:
- `GeminiLanguageModel`: Implements `LanguageModel` protocol with
  reasoning capabilities, configuring execution via `ModelResource`
  and `EndpointConfiguration`.
- `GeminiLanguageModelExecutor`: Converts prompt instructions and
  history into Gemini streaming requests, yielding responses as
  `LanguageModelSession.ResponseStream`.
- `GeminiTranscriptTranslator`: Translates Apple `Transcript` entries
  and segments into Gemini `Content` structures while preserving thought
  signatures and validating supported transcript features.
- `GeminiLanguageModel.Error` and `GeminiErrorMapper`: Translates Gemini
  API, HTTP, and network errors into standard `LanguageModelError` cases
  (`rateLimited`, `timeout`, `guardrailViolation`, `refusal`, and
  `unsupportedLanguageOrLocale`) or `GeminiLanguageModel.Error` cases
  (`serviceUnavailable`, `networkFailure`, `modelNotFound`, `apiError`).
  The `APIError` payload is designed for seamless forward compatibility
  with both GenerateContent and the upcoming Interactions API.
- Testing infrastructure: Adds `ConditionTrait.requireFoundationModels`
  to conditionally run Foundation Models tests only on supported
  platforms (macOS 27+, iOS 27+, watchOS 27+, visionOS 27+), along with
  shared test constants, mock fixtures, and comprehensive unit and
  integration test suites.

2026-09-04 18:05:45 -04:00

..

GenerateContent

feat(ai): add GeminiLanguageModel (#16601)

2026-09-04 18:05:45 -04:00

Shared

feat(ai): add GeminiLanguageModel (#16601)

2026-09-04 18:05:45 -04:00