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OpenRouter tests 13 prompt injection attacks and releases Armor tool

OpenRouter tested 13 prompt injection attacks against four AI models and released Armor to check tool calls against plain-English rules.

OpenRouter tests 13 prompt injection attacks and releases Armor tool — image from OpenRouter
Image: OpenRouter

Summary

OpenRouter tested 13 attacks against four AI models to measure how vulnerable agents are to prompt injection. The company found that text-only attacks rarely work, but agents using tools face high risks from indirect injection. To fix this, OpenRouter released an evaluation tool called Armor that checks tool calls against rules before execution.

What changed

  • Ran 13 prompt injection attacks against four current AI models with defenses on and off.
  • Released Armor to check tool calls against plain-English rules before execution, blocking all 73 attack emails in tests.
  • Noted that Armor adds about 0.3 seconds per tool call at the median and remains unbilled during its beta.

Availability

Beta

“During the beta, Armor’s evaluation isn’t billed.”

Founder takeaway

Test your AI models against prompt injection attacks, label documents as data, and use evaluation tools to check tool calls before code execution.

Source

OpenRouterHow to Prevent Prompt Injection (13 Attacks, Tested)

Announced Checked

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