ADR-0003 — Pin the AI SDK to the v5 line

Status: accepted · 2026-07-30

@orpc-agent/ai-sdk@1.0.0 (the only published line) peers on ai@^5 and is dev-tested against ^5.0.220. @mastra/core@1.54 is provider-version agnostic (it ships v5/v6/v7 provider shims), so it accepts ai@5 tool objects and a hand-written LanguageModelV2. The template therefore uses ai@^5.0.223 everywhere. Revisit when orpc-agent publishes an adapter for a newer ai major; the host protocol (ADR-0002) already isolates the browser from this choice entirely.