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WalkthroughGemini chat and Responses conversions now clone extra parameters before filtering consumed values. Repeated conversions preserve the source request, while outbound payloads exclude values mapped into Gemini configuration. Regression tests cover retry and fallback scenarios. ChangesGemini extra-parameter preservation
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In `@core/providers/gemini/responses.go`:
- Line 4007: Update the ExtraParams return path around the generation-config
handling to always create and return a copy of extraParams, including when no
generation-config key exists. Ensure later removal of safety_settings or
cached_content cannot mutate the original request map, preserving source request
data across retry conversions.
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core/providers/gemini/responses.gocore/providers/gemini/responses_extraparams_retry_test.go
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## Summary Gemini's `Part` type was missing the `mediaResolution` field (Vertex AI v1 Part field 12), which overrides `generationConfig.mediaResolution` for a single part. Because `Part.UnmarshalJSON` decodes into a closed alias, the key was silently discarded before any conversion ran. This caused per-part image/PDF tokenization to fall back to the model default — for example, an `ULTRA_HIGH` image billed ~21k prompt tokens through `/genai` instead of ~22.1k direct. This PR adds the field end-to-end: parsing (both `mediaResolution` and `media_resolution` spellings), round-trip through the Bifrost `ResponsesMessageContentBlock`, outbound reconstruction on `convertContentBlockToGeminiPart`, and stripping on the OpenAI wire path where the field is unknown. ## Changes - **`core/providers/gemini/types.go`**: Added `MediaResolution *PartMediaResolution` to `Part` and its `MarshalJSON`/`UnmarshalJSON` alias structs. Added `PartMediaResolution` type with its own `UnmarshalJSON` that accepts both `numTokens` and `num_tokens`, with camelCase winning when both are present. Snake-case `media_resolution` is accepted as a fallback in `Part.UnmarshalJSON` using the existing `hasJSONKey` precedence pattern. - **`core/providers/gemini/responses.go`**: Added `applyGeminiPartMediaResolution` helper that stamps the per-part resolution onto the `ResponsesMessageContentBlock` produced from `inlineData` and `fileData` parts (not text/thought/function parts). Split `convertContentBlockToGeminiPart` into a builder and a wrapper that re-attaches the resolution only when the resulting part carries `InlineData` or `FileData`, preventing Gemini from rejecting the field on text parts. The value is rebuilt (not aliased) so repeated conversions across retries and fallbacks are independent. - **`core/schemas/responses.go`**: Added `MediaResolution` struct and `MediaResolution *MediaResolution` field on `ResponsesMessageContentBlock`, serialized as `media_resolution`. - **`core/schemas/utils.go`**: `deepCopyResponsesMessageContentBlock` now deep-copies `MediaResolution`, including the `NumTokens` pointer, so retry copies do not share state with the original. - **`core/providers/openai/types.go`**: `OpenAIResponsesRequestInput.MarshalJSON` now strips `MediaResolution` from content blocks in both regular messages and tool message output blocks before sending to OpenAI, matching the existing treatment of `CacheControl` and `Citations`. `hasFieldsToStripInResponsesMessage` is updated to detect `MediaResolution` in tool output blocks so the stripping path is entered. - **`tests/e2e/api/collections/provider-harness.json`**: Added harness cases 31.5–31.9 covering per-part `media_resolution` (snake_case) and `mediaResolution` (camelCase) on GenAI and Vertex, including the override-semantics case where a part-level `HIGH` must win over a request-level `generationConfig.mediaResolution: LOW`. - **`tests/integrations/python/config.json`**: Added `gemini-3.6-flash` to the GenAI model list and a Vertex Global (Gemini 3) provider entry so the new harness cases have a live target. - **`docs/openapi/`**: Documented `mediaResolution` on `GeminiPart` and added `GeminiPartMediaResolution` schema. - **Agent/skill docs**: Removed `APP_DIR`, `CI=1`, and `HARNESS_MAX_REQUESTS` from the harness command template. `APP_DIR` defaults correctly in the Makefile; `CI=1` suppresses the interactive HTML viewer; `HARNESS_MAX_REQUESTS` is now documented as optional rather than required. ## Type of change - [x] Bug fix - [x] Feature - [ ] Refactor - [ ] Documentation - [ ] Chore/CI ## Affected areas - [x] Core (Go) - [ ] Transports (HTTP) - [x] Providers/Integrations - [ ] Plugins - [ ] UI (React) - [x] Docs ## How to test ```sh # Unit tests covering round-trip, snake/camelCase parsing, omit-stays-omitted, # non-image parts, repeated conversions, deep copy, and OpenAI stripping go test ./core/providers/gemini/... ./core/providers/openai/... ./core/schemas/... # Provider harness — per-part media resolution cases (requires genaiKey configured) make dev APP_DIR=$(pwd)/tests/integrations/python make run-provider-harness-test PROVIDER=gemini FEATURE="31" ``` Cases 31.5–31.7 run against GenAI; 31.8–31.9 run against Vertex and skip cleanly if Vertex credentials are absent. The invariant in each HIGH case is that `usageMetadata.promptTokenCount` for HIGH exceeds the value recorded by the preceding LOW case — equal counts indicate the per-part field was dropped. ## Breaking changes - [ ] Yes - [x] No ## Related issues Follows the request-level `generationConfig.mediaResolution` fix from #7138. Per-part resolution is a separate code path (typed field on `Part` rather than `ExtraParams`) and was not covered by that fix. ## Security considerations None. The change reads and forwards a provider-defined enum string and an optional integer. No credentials, secrets, or user-identifying data are involved. ## Checklist - [x] I read `docs/contributing/README.md` and followed the guidelines - [x] I added/updated tests where appropriate - [x] I updated documentation where needed - [x] I verified builds succeed (Go and UI) - [x] I verified the CI pipeline passes locally if applicable
convertParamsToGenerationConfigResponses deleted top_k, frequency_penalty, presence_penalty, stop_sequences and media_resolution from the Bifrost request's ExtraParams while mapping them into generationConfig. The conversion runs once per retry/fallback attempt on the same request, so the second attempt was sent without those settings. For Vertex/Gemini PDF workloads this silently downgraded mediaResolution to the model default on every retried 429. Read the keys without mutating the request and filter them out when the outbound ExtraParams are built, so they still never leak onto the wire as unknown snake_case fields. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The Responses helper returned the source map by reference when no generationConfig key was present, so the later removal of safety_settings and cached_content still mutated the Bifrost request and a retry lost them. The Chat path aliased the map the same way and dropped safety_settings, cached_content and labels on retries. Both paths now clone the map. Regression tests convert the same request three times and assert the fields and the source map on every attempt. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Summary
On the Responses path,
convertParamsToGenerationConfigResponsesdeletestop_k,frequency_penalty,presence_penalty,stop_sequencesandmedia_resolutionfrom the Bifrost request'sExtraParamswhile mapping them intogenerationConfig. That conversion runs inside the provider call, i.e. once per retry/fallback attempt on the sameBifrostResponsesRequest. The first attempt consumes the keys, so every later attempt is sent without them.Observed in production on Vertex (
/genai/v1beta/models/vertex/gemini-3.1-flash-lite:generateContentwithgenerationConfig.mediaResolution: MEDIA_RESOLUTION_HIGHandmax_retries > 0): every request that hit a 429 and was retried reached Vertex with the model-default resolution. The only visible signal isusageMetadata.promptTokenCounthalving on retried requests (1120 → 560 tokens per PDF page on Gemini 3), so the downgrade is silent. #5527 added the inbound/outbound round-trip ofmediaResolution, but the outbound step still mutates the request, so the fix only holds for the first attempt.Changes
core/providers/gemini/responses.go: read the five keys without mutatingparams.ExtraParams; build the outboundGeminiGenerationRequest.ExtraParamsthroughresponsesExtraParamsWithoutGenerationConfigKeys, which filters those keys on a copy (no allocation when none are present). They still never leak onto the wire as unknown snake_case fields, which is what the deletes were protecting against.core/providers/gemini/responses.go:responsesExtraParamsWithoutGenerationConfigKeysalways returns a copy (maps.Clone+maps.DeleteFunc). The laterdeleteofsafety_settings/cached_contentfrom the outbound map previously hit the source request when no generationConfig key was present, so a retry lost them too.core/providers/gemini/chat.go: same aliasing on the Chat Completions path, which removedsafety_settings,cached_contentandlabelsfrom the shared map. The outboundExtraParamsis now a copy.core/providers/gemini/responses_extraparams_retry_test.go: converts the same request three times and assertsgenerationConfigis identical on every attempt, the consumed keys are absent from the wireExtraParams, unrelated passthrough params are kept, and the source request is untouched. Second test reproduces the GenAI inbound → retry scenario formediaResolution. Additional tests coversafety_settings/cached_contenton Responses andsafety_settings/cached_content/labelson Chat across three conversions.core/providers/gemini/chat_extraparams_retry_test.go: Chat Completions counterpart of the retry test.Type of change
Affected areas
How to test
Manual: configure a vertex/gemini provider with
network_config.max_retries: 2, send a GenAIgenerateContentrequest with a PDF andgenerationConfig.mediaResolution: MEDIA_RESOLUTION_HIGH, force a retry (e.g. a first key that 429s). Before this changepromptTokenCounton the retried attempt matches the default resolution; after it, it matches HIGH.Breaking changes
Security considerations
None.
Checklist
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