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Armorer Labs

Armorer Labs is a YC Fall 2026 (F26) company. Based in San Francisco, CA, USA. Team of 2.

  • Developer Tools
  • DevSecOps
  • Cybersecurity
  • AI

About Armorer Labs

GPAgent's own fund-neutral profile, written from public information. Updated Oct 20, 2026.

Summary

Armorer Labs builds a security platform for companies in regulated industries that deploy AI agents. It maps what an agent can be manipulated into doing, simulates attacks to reproduce real vulnerabilities, and writes verified fixes ready for engineer approval, typically within hours. In production, it inspects every agent action in milliseconds, blocking prompt injection, goal hijacking, and data exfiltration without slowing the agent for end users.

Go-to-market

Buyers are security and engineering teams at regulated-industry companies shipping their own AI agents. Prospects start via a booked meeting or a guided product tour on the website, indicating a sales-led motion.

From the Y Combinator listing

How Armorer Labs describes itself in Y Combinator's public directory.

Continuous security verification for AI agents in regulated industries

Armorer helps companies in regulated industries ship their own AI agents faster and keep them secure in production. Most security tools flag an issue and file a ticket. Armorer assesses your agent and simulates attacks to find the real issues. Then it creates a verified fix that stops the attack without breaking the business, ready for your approval in about 4 hours. In production, Armorer checks every agent action in milliseconds, with no GPU needed. It detects malicious behavior such as prompt injection, goal hijacking and data leaks, then allows, holds or denies the action. Armorer's detection models beat every other detector we tested on six public benchmarks. Armorer is 22% more accurate than JEV while being 88x faster, so users won't feel the delay. We spent years building and evaluating AI security systems together at AWS, including its first customer-facing AI security agent, which scaled to 100k+ customers. Armorer is backed by Paul Vixie, an internet pioneer inducted into the Internet Hall of Fame in 2014.

Facts

Industry
B2B / B2B -> Security
Location
San Francisco, CA, USA
Team size
2
Status
Active
Stage
Early

Founders (2)

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