fix/preserve-per-part-media-resolution - #7156
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WalkthroughThe change adds Gemini per-part media resolution support across provider types, response conversion, copying, sanitization, OpenAPI schemas, and tests. It also updates provider harness instructions and adds an OpenAPI ChangesGemini media resolution
Provider harness guidance
OpenAPI request-failure metadata
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~30 minutes Sequence Diagram(s)sequenceDiagram
participant GeminiAPI
participant GeminiPart
participant BifrostContentBlock
GeminiAPI->>GeminiPart: provide mediaResolution
GeminiPart->>BifrostContentBlock: preserve level and numTokens
BifrostContentBlock->>GeminiPart: restore mediaResolution on conversion
Suggested reviewers: Merge Risk: 🔵 Low · up to The new media-resolution schema remains permissive for undeclared fields. Clarify or explicitly accept that API contract before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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akshaydeo
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September 14, 2026 16:16
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Inline comments:
In @.claude/skills/investigate-issue/SKILL.md:
- Around line 811-813: Update the provider harness invocation guidance to make
HARNESS_MAX_REQUESTS optional, while recommending it as a spend cap for broad
runs. Preserve the existing provider/feature and SMOKE=1 examples, and do not
instruct users to always pass the variable.
In `@docs/openapi/schemas/integrations/genai/generation.yaml`:
- Line 92: Add additionalProperties: false to the GeminiPartMediaResolution
schema, and update PartMediaResolution.UnmarshalJSON to reject any property
other than level, numTokens, and the supported num_tokens alias while preserving
existing decoding behavior.
In `@tests/e2e/api/collections/provider-harness.json`:
- Line 43727: Update case 31.9’s generationConfig to set mediaResolution to
MEDIA_RESOLUTION_LOW, matching the override structure used by case 31.7, while
preserving the existing per-part HIGH mediaResolution assertion.
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.claude/skills/investigate-issue/SKILL.md.claude/skills/resolve-pr-comments/SKILL.mdAGENTS.mdcore/providers/gemini/gemini_test.gocore/providers/gemini/responses.gocore/providers/gemini/types.gocore/providers/openai/responsesmarshal_test.gocore/providers/openai/types.gocore/schemas/responses.gocore/schemas/responses_test.gocore/schemas/utils.godocs/openapi/openapi.jsondocs/openapi/schemas/integrations/genai/generation.yamltests/e2e/api/collections/provider-harness.jsontests/integrations/python/config.json
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Summary
Gemini's
Parttype was missing themediaResolutionfield (Vertex AI v1 Part field 12), which overridesgenerationConfig.mediaResolutionfor a single part. BecausePart.UnmarshalJSONdecodes 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, anULTRA_HIGHimage billed ~21k prompt tokens through/genaiinstead of ~22.1k direct. This PR adds the field end-to-end: parsing (bothmediaResolutionandmedia_resolutionspellings), round-trip through the BifrostResponsesMessageContentBlock, outbound reconstruction onconvertContentBlockToGeminiPart, and stripping on the OpenAI wire path where the field is unknown.Changes
core/providers/gemini/types.go: AddedMediaResolution *PartMediaResolutiontoPartand itsMarshalJSON/UnmarshalJSONalias structs. AddedPartMediaResolutiontype with its ownUnmarshalJSONthat accepts bothnumTokensandnum_tokens, with camelCase winning when both are present. Snake-casemedia_resolutionis accepted as a fallback inPart.UnmarshalJSONusing the existinghasJSONKeyprecedence pattern.core/providers/gemini/responses.go: AddedapplyGeminiPartMediaResolutionhelper that stamps the per-part resolution onto theResponsesMessageContentBlockproduced frominlineDataandfileDataparts (not text/thought/function parts). SplitconvertContentBlockToGeminiPartinto a builder and a wrapper that re-attaches the resolution only when the resulting part carriesInlineDataorFileData, 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: AddedMediaResolutionstruct andMediaResolution *MediaResolutionfield onResponsesMessageContentBlock, serialized asmedia_resolution.core/schemas/utils.go:deepCopyResponsesMessageContentBlocknow deep-copiesMediaResolution, including theNumTokenspointer, so retry copies do not share state with the original.core/providers/openai/types.go:OpenAIResponsesRequestInput.MarshalJSONnow stripsMediaResolutionfrom content blocks in both regular messages and tool message output blocks before sending to OpenAI, matching the existing treatment ofCacheControlandCitations.hasFieldsToStripInResponsesMessageis updated to detectMediaResolutionin 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-partmedia_resolution(snake_case) andmediaResolution(camelCase) on GenAI and Vertex, including the override-semantics case where a part-levelHIGHmust win over a request-levelgenerationConfig.mediaResolution: LOW.tests/integrations/python/config.json: Addedgemini-3.6-flashto the GenAI model list and a Vertex Global (Gemini 3) provider entry so the new harness cases have a live target.docs/openapi/: DocumentedmediaResolutiononGeminiPartand addedGeminiPartMediaResolutionschema.APP_DIR,CI=1, andHARNESS_MAX_REQUESTSfrom the harness command template.APP_DIRdefaults correctly in the Makefile;CI=1suppresses the interactive HTML viewer;HARNESS_MAX_REQUESTSis now documented as optional rather than required.Type of change
Affected areas
How to test
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.promptTokenCountfor HIGH exceeds the value recorded by the preceding LOW case — equal counts indicate the per-part field was dropped.Breaking changes
Related issues
Follows the request-level
generationConfig.mediaResolutionfix from #7138. Per-part resolution is a separate code path (typed field onPartrather thanExtraParams) 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
docs/contributing/README.mdand followed the guidelines