# Plurai launches free Plurai Simulation to test AI agents before users do

> Original title: The worst agent bug is the one you saw once in production and can’t trigger again.

- Source: Rohan Paul
- Published: 2026-11-11T15:32:10.000Z
- Bad Influence: https://badinfluence.news/items/l5oenl967ok2ex0uxgmpjqzv6
- Original: https://x.com/rohanpaul_ai/status/2120540091773022481

## Summary

Plurai launches Plurai Simulation, a free flight simulator for AI agents that rebuilds an agent's code, tools and environment as a digital twin. The tool sends simulated users at the agent and checks what it actually did, such as whether a refund exists in a simulated billing system rather than just what it said. Failures come with the run that exposed them, and production failures can be replayed against new versions of the agent.

## Post

The worst agent bug is the one you saw once in production and can’t trigger again.

@pluraiAI built a flight simulator for AI agents: 
it reads your code, rebuilds the tools and records your agent uses, then sends simulated customers at it to find where it breaks before real ones do.

e.g. when an AI support agent tells a customer “your refund is done,” most tests just read that sentence, while Plurai checks a simulated copy of the billing system to see if the refund exists.

## Quoted post @ilan_kadar

> Big day for us at @pluraiAI ! Plurai Simulation is live and free for every AI engineer.
> 
> AI agents look great in demos. Until real users break them.
> 
> So we built a world where your agent can fail, learn, and get fixed before your users ever see it.
> 
> → Digital twin: Your real agent, its tools, and environment recreated from your code
> 
> → Simulated users & tasks: Realistic users, tasks, and workflows that push your agent into the edge cases that matter
> 
> → Auto evals: Check what your agent actually did, not just what it said
> 
> → Verified fixes: Every failure comes with the run that exposed it and a fix you can verify
> 
> → Replays: Turn any production failure into a simulation and replay it against every new version of your agent
> 
> All inside the coding agent you already use: @claudeai code, @OpenAICodexCli , or @GitHubCopilot .
> 
> Start simulating for free: https://simulation.plurai.ai/connect

https://x.com/ilan_kadar/status/2120524450831413518