fix(google): allow AI Studio bare Gemini Flash IDs - #1739
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📝 WalkthroughWalkthroughThe PR adds the ChangesGemini wire-model renaming
Estimated code review effort: 2 (Simple) | ~15 minutes Merge Risk: 🔵 Low · up to The PR adds an opt-in setting for bare Gemini Flash IDs while preserving existing defaults, but operators could misconfigure the setting without clearer documentation, and a future regression could expose the wrong model identity in requests without a focused assertion. The PR is otherwise low risk and mergeable with explicit owner follow-up. Sequence Diagram(s)sequenceDiagram
participant ProviderConfig
participant GoogleAdapter
participant GoogleEndpoint
ProviderConfig->>GoogleAdapter: directGeminiWireRenames setting
GoogleAdapter->>GoogleAdapter: Apply or skip direct Gemini wire rename
GoogleAdapter->>GoogleEndpoint: Send direct Gemini, Cloud Code Assist, or Vertex model ID
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Pull request overview
This PR adds a provider-level Google configuration toggle to control whether the AI Studio (“direct”) adapter rewrites certain Gemini Flash model IDs to their -tiered wire equivalents, restoring compatibility with deployments where the bare IDs (e.g. gemini-3.7-flash) are still the only valid upstream model names.
Changes:
- Introduces
directGeminiWireRenames?: booleanon provider configs (types + zod schema) and validates it as a boolean with round-trip persistence. - Updates the Google adapter so the
-tieredmapping is configurable for AI Studio only; Vertex and Cloud Code Assist behavior remains unchanged. - Adds focused regression tests for default vs opt-out behavior and documents the new provider setting.
Reviewed changes
Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| tests/google-adapter.test.ts | Adds adapter-level tests covering default -tiered mapping, opt-out behavior, and Vertex non-impact. |
| tests/config.test.ts | Adds config validation + save/load round-trip coverage for directGeminiWireRenames. |
| src/types.ts | Extends OcxProviderConfig with the new directGeminiWireRenames option and documents its intent/scope. |
| src/config.ts | Extends provider zod schema to accept directGeminiWireRenames as an optional boolean. |
| src/adapters/google.ts | Makes AI Studio -tiered wire renames configurable and ensures Vertex requests keep the requested model ID. |
| docs-site/src/content/docs/reference/configuration/providers.md | Documents the new Google-only provider option in the configuration reference table. |
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Actionable comments posted: 3
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Inline comments:
In `@docs-site/src/content/docs/reference/configuration/providers.md`:
- Line 124: Update the directGeminiWireRenames configuration row to explicitly
state that it applies only to direct AI Studio requests, while Vertex preserves
the requested model ID and Cloud Code Assist routing remains unchanged.
In `@src/adapters/google.ts`:
- Around line 391-393: Extend the Google adapter tests around the direct Gemini
model-ID resolution to cover explicit directGeminiWireRenames: true and Cloud
Code Assist behavior. Assert that explicit true applies the direct rename, while
Cloud Code Assist ignores the flag and preserves its model ID; keep the existing
default, false, and Vertex coverage unchanged.
- Around line 391-394: Update the identifyRoutedModel input in the Google
adapter to use parsed.modelId, while retaining routedModelId for the upstream
URL and other routing behavior.
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docs-site/src/content/docs/reference/configuration/providers.mdsrc/adapters/google.tssrc/config.tssrc/types.tstests/config.test.ts
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Inline comments:
In `@docs-site/src/content/docs/reference/configuration/providers.md`:
- Line 124: Update the directGeminiWireRenames? documentation row to explicitly
state that omitted or true retains the default -tiered Gemini Flash renaming,
while false preserves bare IDs; keep the existing Vertex and Cloud Code Assist
behavior unchanged.
In `@tests/google-adapter.test.ts`:
- Around line 307-313: Add a focused regression assertion to the existing
directGeminiWireRenames test using a fixture containing the Codex identity line;
inspect the serialized systemInstruction from buildRequest and verify it
includes the public parsed.modelId while excluding the corresponding -tiered
wire ID.
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docs-site/src/content/docs/reference/configuration/providers.mdsrc/adapters/google.tstests/google-adapter.test.ts
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Requested changes from full review:
-
Document the boolean contract explicitly.
directGeminiWireRenamesshould state both sides of the behavior, not only the opt-out:undefined/trueapplies the known-tieredwire rename for direct AI Studio requests;falsepreserves the requested bare model ID. Vertex and Cloud Code Assist remain unaffected. -
Add a regression test for the system-identity fix. The production change correctly keeps
parsed.modelIdin the system identity while using the rewritten ID only on the wire, but the current tests only assert URL/wire behavior. Please add a request containing the Codex/OpenAI identity-bearing system prompt, build it with the tiered rename active, and assert the serialized GeminisystemInstructionidentifies the public model (e.g.gemini-3.7-flash) and does not containgemini-3.7-flash-tiered.
The runtime opt-out behavior itself looks correct and current Cross-platform CI is green. These two items close the remaining contract/regression gaps.
Keep the existing -tiered mapping by default while allowing AI Studio providers that still serve bare Gemini Flash ids to opt out. Cover both Flash generations and document the provider setting.
…-out - identifyRoutedModel now names parsed.modelId so a -tiered wire rename never leaks into the system prompt identity (CodeRabbit finding) - document that directGeminiWireRenames affects only AI Studio direct requests; Vertex and Cloud Code Assist are unchanged - add adapter tests for explicit true and Cloud Code Assist opt-out
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Re-review on current head e98fd2fb56316d4f73f22a226103d864caba47c2.
The two findings from my previous review are fixed: the full directGeminiWireRenames boolean contract is now documented, and the public-model identity regression is covered for direct AI Studio.
One correctness blocker remains:
- [P2] The system-identity fix is applied too broadly across Google modes.
messagesToGeminiFormat()now always callsidentifyRoutedModel(..., parsed.modelId), even though Cloud Code Assist first resolves a distinctroutedModelIdwithresolveAntigravityEffortWireModel(). That resolver does real model migration/aliasing, not just a cosmetic direct-AI-Studio suffix rewrite. For example, retiredgemini-3.6-flashselections are intentionally routed to the currentgemini-3.7-flash-tieredCCA wire model. The current code would therefore send the request to 3.7 while injecting a system instruction telling it to identify as 3.6. This conflicts with theidentifyRoutedModelcontract, which expects the concrete model actually sent upstream.
Please scope the public-ID identity exception to the direct AI Studio -tiered rename only. Cloud Code Assist should continue identifying with its resolved routed/wire model. A simple shape would be to pass an explicit identity model into messagesToGeminiFormat(): use routedModelId for cloud-code-assist, and parsed.modelId for direct AI Studio/Vertex. Add a focused CCA regression using a migrated/retired alias such as gemini-3.6-flash and assert the system identity does not claim the retired model.
All current CodeRabbit inline threads are resolved. The branch is also behind current dev, and exact-head React Doctor / Cross-platform CI are still action_required; after the code fix, please refresh onto current dev and run the real workflows on the resulting head.
Summary
gemini-3.7-flashmade opencodex sendgemini-3.7-flash-tieredon the wire. The upstream returned HTTP 404 before generation, so Codex Desktop appeared to receive no model response.gemini-3.7-flashandgemini-3.6-flash, HTTP 404 for both-tieredids, andListModelscontained no-tieredmodel. This is an observed deployment compatibility difference, not a claim that every Google account behaves the same way.directGeminiWireRenames: falsefor affected AI Studio providers. The default remains the existing-tieredmapping, so installations where-tieredworks retain their behavior.config.jsonand restart the proxy.falseround-trip, and document the setting.devhead (2026-08-16,65eda6c28) — branch is 0 commits behind.e4d83f6e6preserves the resolved routed identity for Cloud Code Assist aliases, including the retiredgemini-3.6-flash→gemini-3.7-flash-tieredmigration regression.Verification
bun run typecheck— passed on current head.bun run privacy:scan— passed on current head.bun test tests/google-adapter.test.ts tests/google-antigravity-wire.test.ts tests/config.test.ts— 212 passed, 0 failed, 878 assertions.cd docs-site && bun run build— passed (385 pages).git diff --check— passed.bun run testdid not produce a green local result on this host: one run hit an unrelated fixed-5-second catalog-sync timeout that passed alone in 2.95 seconds; later runs were terminated by the host with SIGKILL/exit 137 before the final summary.0 failsummaries for 812 of 814 test files. The two remaining unrelated files (tests/integrations-invariants.test.tsandtests/opencode-cli.test.ts) were also terminated with exit 137 before their summaries while the host had about 386 MiB of free pages. The local-CI checkbox therefore remains unchecked.Checklist
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Summary by CodeRabbit
New Features
-tieredsuffix behavior; setting the option tofalsepreserves the original IDs.Bug Fixes