We Audited 4 Major AI SDKs — 200 Critical Findings in LangChain, 17 in Vercel AI SDK
We ran CodeSlick across vercel/ai, LangChain.js, openai-node, and MCP Servers — 5,381 files, 20,355 findings. Three failure modes appear in every repository: missing error handling, missing null checks, and hardcoded credentials in examples. Here is what the patterns mean for developers building on top of these libraries.