AI SDK Guardrails

What it is

AI SDK Guardrails is a middleware designed for the Vercel AI SDK, providing input and output guardrails to enhance safety, quality control, and cost management in AI applications. It intercepts prompts and responses, ensuring that AI interactions adhere to predefined rules and standards. Written in TypeScript, the tool is open-source under the MIT license and supports integration with Vercel's AI SDK, making it a suitable choice for developers looking to add an extra layer of control to their AI systems.

Specifically designed to integrate with Vercel AI SDK for enhanced control.

When it fits — and when it doesn’t

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

1. 01

   Limited community engagement

   Only 24 stars and 1 fork on GitHub

2. 02

   Emerging maturity

   Created in 2025 with only 14 versions released

3. 03

   Low weekly downloads

   504 weekly downloads on npm

What it does well

• Open-source with MIT license

  Available on GitHub under MIT license

• Integrates with Vercel AI SDK

  Specifically designed as middleware for Vercel AI SDK

• Written in TypeScript

  Codebase is in TypeScript

Pricing

Free tier

Yes

Paid from

—

Model

Flat rate

Enterprise plan

No

Pricing last confirmed Oct 3, 2026.