Prompt instructions like 'never do X' don't hold up in production. LLMs ignore them when context gets long or users push hard.

Limits sits between your agent and the real world. Every action — database writes, API calls, refunds — gets intercepted and checked against your rules before it executes. Deterministically. No LLM involved in enforcement.

Three modes:

Conditions: hard rules on structured data Guideance: validate LLM output before it reaches the user and give the agent chance to reason and retry Guardrails: scan for PII, toxicity, prompt injection etc

One line to integrate: npm install @limits/js

our website: https://limits.dev

our docs: https://docs.limits.dev

We've processed 30,000+ policy checks across 16 teams. Would love feedback from anyone who's built something like this internally."