feat: ai-sdk support for xai and deepseek

[uinstinct]

Description

add support for xai and deepseek providers

requires #10642 to be merged first

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• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Adds support for xAI and DeepSeek providers and upgrades adapters to Vercel AI SDK v6, aligning tool, message, and streaming formats for compatibility.

• New Features

  • Added xai and deepseek providers (createXai, createDeepSeek) and wired them into AiSdk PROVIDER_MAP.
  • Switched Anthropics to native createAnthropic.

• Migration

  • Upgraded ai to v6; update dependencies accordingly.
  • Tools: parameters renamed to inputSchema; top-level schema must be type "object".
  • Tool calls: args renamed to input in messages and streams.
  • Streaming: text/reasoning now use start/delta/end with ids; file and source shapes updated.
  • max_tokens now passed as maxOutputTokens in AiSdkApi.

^{Written for commit 7fd2137. Summary will update on new commits.}

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[cubic-dev-ai]

1 issue found across 5 files

Prompt for AI agents (unresolved 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="package.json">

<violation number="1" location="package.json:28">
P2: @ai-sdk/deepseek is only added to the root package.json even though the import lives in packages/openai-adapters. That package doesn’t declare @ai-sdk/deepseek, so its build/publish will miss a required dependency. Move/add the dependency to packages/openai-adapters/package.json (or declare it there as well).</violation>
</file>

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

[cubic-dev-ai]

P2: @ai-sdk/deepseek is only added to the root package.json even though the import lives in packages/openai-adapters. That package doesn’t declare @ai-sdk/deepseek, so its build/publish will miss a required dependency. Move/add the dependency to packages/openai-adapters/package.json (or declare it there as well).

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At package.json, line 28:

<comment>@ai-sdk/deepseek is only added to the root package.json even though the import lives in packages/openai-adapters. That package doesn’t declare @ai-sdk/deepseek, so its build/publish will miss a required dependency. Move/add the dependency to packages/openai-adapters/package.json (or declare it there as well).</comment>

<file context>
@@ -23,5 +23,8 @@
     "typescript": "^5.6.3"
+  },
+  "dependencies": {
+    "@ai-sdk/deepseek": "^2.0.20"
   }
 }
</file context>