Fabraix Playground
Overview
Fabraix Playground is an open-source environment designed for security testing and red-teaming of AI agents. It provides a collection of public prompts that users can use to probe the behavior of AI agents, identify vulnerabilities, and assess robustness. The playground is free to use and aims to help developers and security researchers improve the safety and reliability of AI systems by exposing them to adversarial inputs.
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Key Features
- Open-source playground
- Collection of public prompts
- Red-teaming capabilities
- Free to use
Pros
- Free and open-source
- Useful for security testing
- Community-driven prompt collection
Cons
- Limited to public prompts
- May require technical expertise to use effectively
- Not a comprehensive security solution
Who Is This Tool Best For?
Security researchers and developers looking to test and harden AI agents against adversarial prompts.
What people ask about Fabraix Playground
What is Fabraix Playground?
An open-source environment for testing AI agents against a library of known adversarial prompts, so you can see how they fail before someone else finds out.
Is Fabraix Playground right for you?
Developers and security teams shipping agents that take actions, where a bad prompt has consequences beyond a strange answer.
Is Fabraix Playground worth paying for?
It is free and open source. The cost is the model calls each test makes, which run on whatever provider your agent uses.
Does passing mean the agent is safe?
No. A public prompt set tests what is already known, and a clean run shows only that the obvious cases are handled. New attack phrasing is the case that matters, and it is by definition not in the library.
Use cases
Testing before deployment
Running a known prompt set against an agent is a cheap check before it touches real data.
Comparing models or versions
The same prompts against two configurations show whether a change made the agent more or less robust.
Building a regression suite
A fixed set of adversarial prompts that runs on every change catches the vulnerability you fix and then reintroduce.
Pricing
Fabraix Playground costs nothing to try, and its directory score is 4.3. The playground is free and open source; the model calls each test makes are billed by your provider, so the cost scales with how often you run the suite. Details are on the project site. Rates change — the project site is authoritative.
Alternatives
- A commercial AI security scanner — Broader coverage and a subscription.
- A hand-written test suite — Tailored to your agent, and limited by what you thought of.
- Prompt-injection research papers — The source of many of these prompts, without the harness.
Our AI tools directory lists them side by side.
Things to settle before buying
Do not treat a pass as assurance
Public prompts are known prompts. Passing means the known cases are handled, not that the agent is safe.
Run it against every change
Robustness regresses quietly. A fixed suite on every deploy is what catches it.