feat: support gemini through ai sdk

[uinstinct]

Description

Add support for gemini via ai sdk.

requires #10642 to be merged first

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Continue Tasks: ❌ 7 failed — View all

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Summary by cubic

Adds Gemini support via the SDK and updates adapters, tooling, and streaming to SDK v6 formats. This removes feature flags and standardizes providers (OpenAI, Anthropic, Google) behind the SDK.

• New Features

  • Google Gemini models supported through the SDK.
  • Preserves extra_content in assistant tool calls.
  • Updated stream conversion to v6 (text/reasoning start/delta/end; thought signature support).

• Refactors

  • Switches provider map to createAnthropic/createGoogleGenerativeAI/createOpenAI.
  • Aligns tool/message formats: parameters → inputSchema, args → input.
  • Uses maxOutputTokens for token limits; removes USE_VERCEL_AI_SDK flags.
  • Upgrades dependencies to SDK v6; updates tests to use the SDK provider; removes outdated docs.

^{Written for commit 9de0c89. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 17 files

Prompt for AI agents (all issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="packages/openai-adapters/src/openaiToVercelMessages.ts">

<violation number="1" location="packages/openai-adapters/src/openaiToVercelMessages.ts:90">
P2: Tool-call payload uses `input` instead of documented `args` for CoreMessage ToolCallPart, which can break schema validation or consumers expecting `args`.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P2: Tool-call payload uses input instead of documented args for CoreMessage ToolCallPart, which can break schema validation or consumers expecting args.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At packages/openai-adapters/src/openaiToVercelMessages.ts, line 90:

<comment>Tool-call payload uses `input` instead of documented `args` for CoreMessage ToolCallPart, which can break schema validation or consumers expecting `args`.</comment>

<file context>
@@ -73,17 +73,28 @@ export function convertOpenAIMessagesToVercel(
                 toolCallId: tc.id,
                 toolName: tc.function.name,
-                args,
+                input,
+                ...(thoughtSignature && {
+                  providerOptions: {
</file context>