Agent Arena: Testing AI Agents Against Prompt Injection Attacks
By
joozio
Fresh out the oven, still warm. Top of the tray.
Summary
Agent Arena is a testing platform that allows developers to evaluate their AI agents' vulnerability to prompt injection attacks. The tool provides a test page with 10 hidden attack vectors where users can send their AI agents to summarize content and then paste the response into a scorecard to see which attacks their agent fell for. The article explains the three-step process: sending the agent to the test page, copying the response, and scoring the results. It includes testing of 8 different AI models and provides a direct link to the test page along with a copyable prompt for testing.
Key quotes
· 5 pulledHow manipulation-proof is your AI agent? Send it to a page full of hidden prompt injection attacks and find out.
8 models tested · 10 attack vectors · Last updated Apr 2026
Step 1: Send - Point your AI agent at the test page and ask it to summarize the content.
Step 2: Paste - Copy your agent's response and paste it into the scorecard below.
Step 3: Score - Instantly see which hidden attacks your agent fell for.
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