Eclusia
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Legal professionals handling confidential cases
Fabraix Red Team Playground
FreeOpen SourceAPISelf-Hosted
Building guardrails for an AI agent is easy until you need an adversary — a repeatable, structured way to verify those guardrails actually hold under real attack pressure, not just the five test prompts you wrote yourself.
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Get This Tool
License: MIT Any use incl. commercial
Local-run terms: Run the React frontend locally via npm install and npm run dev; connects to live API for agents.
Pricing
- Model
- Free
Summary
Fabraix Red Team Playground is an open-source, MIT-licensed testing environment structured around CTF-style challenges that let you probe published agent prompts for prompt injection vulnerabilities and guardrail failures. The workflow is concrete: challenges present a live agent prompt, you craft adversarial inputs, and the platform scores whether your attack broke containment. Self-hosting via npm means your proprietary prompts never leave your environment, which matters when the thing you are testing is a production system prompt you cannot share publicly. The challenge library is community-contributed and public, so coverage depends entirely on what the research community has submitted — niche agent architectures with specialized guardrail logic will find thin coverage fast.
Bottom line: Pick this when you need structured, repeatable adversarial tests against known prompt injection patterns and want to contribute findings back to a shared safety dataset — plan for something else when your agent uses domain-specific guardrails that no published challenge comes close to testing.
Find your fit
Before you choose Fabraix Red Team Playground
More options in Guardrails & Safety. Compare pricing, platforms, and features side by side.
Argot
Free · Open source
Teams using AI coding agents
Pros
- CTF-style challenge structure turns prompt injection testing into a repeatable, scored exercise rather than ad-hoc red-teaming, so you get consistent coverage across team members with different skill levels.
- MIT license with self-hosted npm deployment means your production system prompts stay on your infrastructure — no third-party exposure risk when testing prompts you cannot share publicly.
- Community-contributed challenge corpus means attack surfaces reflect real deployed agent configurations, not synthetic examples, so you are practicing against the injection patterns practitioners have actually encountered.
- API access allows scripted test runs, so red-team checks can be added to a CI pipeline rather than living as a manual step that gets skipped before a Friday deploy.
- Free and open-source with no paid-only feature gates, so a security researcher or small team gets the full capability without budget approval blocking initial evaluation.
Cons
- The challenge library covers what the community has published — teams with agents built on niche retrieval architectures or specialized guardrail logic will exhaust relevant challenges fast and face building their own, which requires contributing attack surface details back to a public repository; teams unwilling to do that switch to a private adversarial testing service where they control the entire corpus.
- Scoring is bounded by the challenge definitions already in the system: if your guardrail bypasses a listed challenge but your actual threat model involves a different injection vector, the platform returns a pass that tells you nothing — teams running security audits against compliance requirements find this gap immediately and supplement with manual red-team engagements.
- The scraped page content and validator context confirm no details about challenge update cadence or maintainer response time for newly discovered injection patterns; teams that need their testing corpus to track emerging attack techniques in near-real-time cannot confirm that commitment from available documentation.
About
- Platforms
- Web, npm
- API Available
- Yes
- Self-Hosted
- Yes
- Last Updated
- August 14, 2026
Best For
Who it's for
- AI security researchers
- Developers building agent guardrails
- Red team practitioners
- Community contributors to AI safety datasets
What it does well
- Test prompt injection resilience of AI agents
- Evaluate guardrail effectiveness in adversarial settings
- Contribute to public AI security research via shared challenges
- Practice red-teaming techniques against published agent prompts
Frequently Asked Questions
- Is Fabraix Red Team Playground free?
- Fabraix Red Team Playground offers a free option. Hosting, model usage, or optional services may have separate costs; check the pricing details and official terms.
- Is Fabraix Red Team Playground open source?
- Yes. Fabraix Red Team Playground is open source.
- Does Fabraix Red Team Playground have an API?
- Yes. Fabraix Red Team Playground exposes a developer API. See the official documentation at https://playground.fabraix.com for details.
- Can I self-host Fabraix Red Team Playground?
- Yes. Fabraix Red Team Playground supports self-hosting on your own infrastructure.
- When was Fabraix Red Team Playground released?
- Fabraix Red Team Playground was first released in 2026.
- What platforms does Fabraix Red Team Playground support?
- Fabraix Red Team Playground is available on: Web, npm.
Curated lists that include this category
The gap between writing guardrails and proving they work
Building guardrails for an AI agent is easy until you need an adversary — a repeatable, structured way to verify those guardrails actually hold under real attack pressure, not just the five test prompts you wrote yourself. Fabraix Red Team Playground supplies that structure through open-source, MIT-licensed CTF-style challenges. Each challenge presents a live agent prompt; you craft adversarial inputs and receive a score on whether containment broke.
How it works
Self-hosting runs via npm so proprietary prompts stay inside your own environment. The platform lists four concrete use cases: testing prompt injection resilience, evaluating guardrail effectiveness in adversarial settings, contributing to public AI security research, and practicing red-teaming on published prompts. It runs on web and npm, exposes an API, and supports self-hosting.
Strengths and limits
The CTF format turns testing into a scored, repeatable exercise across team members. Community-contributed challenges reflect real agent configurations rather than synthetic examples. At the same time the library only covers what contributors have published, so teams with niche retrieval or guardrail setups may run out of relevant challenges and must either add their own or move to a private service. Scoring stays bounded by the listed challenges. The self-hosted setup keeps proprietary prompts private.
Who it is for / who should skip it
Best for AI security researchers, developers building agent guardrails, red team practitioners, and community contributors to AI safety datasets. Teams unwilling to share attack surfaces publicly or facing highly specialized architectures should skip it in favor of controlled private testing services.
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