Vercel AI Updates: August 17, 2026

1. AI SDK Moonshot Provider Normalizes Tool Schemas for Server Validation

Vercel. The AI SDK’s Moonshot provider shipped @ai-sdk/moonshotai@3.0.35, which normalizes tool schemas to satisfy Moonshot’s server-side validator by converting tuple items and restructuring type definitions before requests are sent. The change adds client-side validation so malformed schemas surface as clear errors rather than opaque server failures, reducing debugging friction for developers wiring tool calling into Moonshot models. Source

2. AI SDK Harness Layer Fixes Finish-Step Emission Timing

Vercel. A @ai-sdk/harness-acp@1.0.10 release corrected the timing of finish-step emission in the AI SDK harness layer’s Agent Client Protocol adapter, which handles ACP-compatible coding-agent runtimes. The dependent @ai-sdk/harness-grok-build@1.0.9 release picked up the fix through an updated dependency, keeping the Grok Build adapter aligned with the corrected step-completion behavior. Source