Squash Odysseus development history

specs/model-providers/google.md

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+# Google Gemini Provider Shape
+
+Last updated: dev@e71f8ce | 2026-08-25
+
+## Scope
+
+Canonical provider ID `google`; native GenerateContent plus optional Google
+OpenAI-compatible chat; readers `google.py` and
+`google_ai_studio_mapping.py`; catalog/probe ownership in
+`routes/model_routes.py`.
+
+## Catalog Shape
+
+Use the native paginated `GET /v1beta/models` endpoint, including
+`nextPageToken`, with `x-goog-api-key` when configured. `models[]` can contain:
+
+- `name`, `baseModelId`, `version`, and `displayName`;
+- `inputTokenLimit` and `outputTokenLimit`;
+- `supportedGenerationMethods`;
+- `thinking`, `temperature`, `maxTemperature`, `topP`, and `topK`.
+
+Embedding-only methods map to embedding. Generation methods prove a native
+method, not chat/image/video/audio modality, so those records remain unknown
+unless stronger structured evidence exists. `thinking: true` and explicit
+sampling fields map to a reasoning claim and controls. Model IDs such as
+Imagen, Veo, or TTS names are not parsed.
+
+## Request And Response Shape
+
+Native generation uses `contents`, `systemInstruction`,
+`generationConfig`, `tools[].functionDeclarations`, and
+`models/{model}:generateContent|streamGenerateContent`. Responses use
+`candidates[].content.parts[]` for `text`, `functionCall`, `functionResponse`,
+`thought`, and `thoughtSignature`; token accounting is in `usageMetadata`.
+Native Google tool/thought continuity must not be flattened through an
+OpenAI-only history shape.
+
+## Fallback And Safety
+
+Prefer native model metadata even when chat is configured through Google's
+OpenAI compatibility URL. Pagination parameters must remain stable between
+pages. The route probe activates only for the exact
+`generativelanguage.googleapis.com` hostname, filters the picker list to
+content-generation methods, returns no curated fallback after probe failure,
+and defaults those endpoints to manual catalog refresh unless explicitly
+overridden. The canonical Google reader is not yet called by that probe.
+Unknown methods and fields stay raw; unrecognized prediction models remain
+unknown.
+
+## Current Gaps
+
+- The Models resource does not expose full modalities for every Google media
+  family.
+- Native Gemini request/response support is not yet the only runtime path.