#migration-playbook

Migrate from LangChain to the Vercel AI SDK 6 — function-call mapping, tool registration, streaming adapter shift, cost and quality deltas measured.

Migrate from the legacy TypeScript Codex CLI to the current Rust CLI — config.toml schema, auth surface, profile API, sandbox modes, rollout plan.

Migrate DeepSeek V3.2 to V4 across open-weight stacks — three reasoning modes, tokenizer change, HCA/CSA attention deltas, KV-cache reduction.

Migrate Next.js 15 to 16 — cache components, use cache directive, cacheLife/cacheTag adoption, unstable_cache deprecation. Codemods and rollout plan.

Migrate Prisma 6 to 7 — Rust query-engine deprecation, typed SQL adoption, generator path change, runtime selection, and the breaking-changes matrix.

Migrate Vercel AI SDK from v5 to v6 — useChat changes, tool-call streaming differences, provider-adapter contract shifts, codemods, and rollout plan.

Migrate from Claude Code SDK to Claude Agent SDK (TS + Python). Package renames, system-prompt default change, settings sources, v0.1.0 breaking changes.

Migrate Gemini 3 Pro to 3.1 with Deep Think — availability tier shift, pricing changes, safety-filter deltas, tool-use schema diff, and rollout plan.

Migrate GPT-5.2 to 5.5 — reasoning-effort behavior change, tool-call schema diff, cost-curve impact, structured outputs, and a phased rollout plan.

Migrate Claude Opus 4.6 to 4.7 — prompt-cache key changes, tool-use schema deltas, 1M context economics, compaction API surface, and rollout plan.