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#vercel-ai-sdk

2 posts

LLM & IntegrationSeptember 25, 202617 min
Claude Opus 5.5 tool_choice 400: 3 SDKs Tested (2026)
Claude Opus 5.5 rejects forced tool_choice with a 400. I captured what the AI SDK, LangChain and the raw SDK actually send, and built a preflight check.
LLM & IntegrationJune 20, 202615 min
Test Vercel AI SDK Code with MockLanguageModelV3 (2026)
Unit-test Vercel AI SDK v6 code in TypeScript with MockLanguageModelV3 - no API key, no cost. Mock generateText, tool calls, and streaming in Vitest.

Every post in #vercel-ai-sdk (2)

Claude Opus 5.5 tool_choice 400: 3 SDKs Tested (2026)