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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 Labs is a Y Combinator company in the Fall 2026 batch. Its directory entry describes it as: Continuous security verification for AI agents in regulated industries. The founders listed are Daniel Begimher (Founder/CEO), Cristian Leo (Founder/CTO) (Y Combinator directory entry, October 19, 2026).
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New accelerator entry · 2026-10-19 · the record
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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, Internet Hall of Fame inductee and former AWS Deputy CISO.
Most-starred repository: Armorer-Guard — 44 stars, Python.
Counted 2026-10-20 across repositories the account owns; forks are excluded.
Checked away from the directory entry. What is below does not come from the company's Y Combinator page.
Armorer finds the attack, fixes it, and proves your agents still do their job. Findings mapped to OWASP, MITRE ATLAS and NIST. Your team approves every change.
The title and description the site itself served, answering 200. Not a cached copy and not the company's directory entry — what was live when we asked.
Co-founder of Armorer Labs. Previously led the global Application Security technical field community at AWS, where he led development of AWS Security Incident Response's AI-powered investigative agent from early development through public launch. Author of SIR-Bench - evaluation method for security agents; author of ASH code scanner (200K+ monthly clones); co-created ThreatForest, selected for Black Hat USA 2026 briefing. Led incident response for Fortune 500 breaches and red-team operations.
Co-Founder of Armorer Labs (YC F26). Led AI security science at AWS, building and evaluating AI systems for security. He is the creator of ThreatForest, the first open source automated threat modeling agent, and a co-author of SIR-Bench, a benchmark for evaluating AI security investigations. He is a Black Hat and re:Invent speaker.
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Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News
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