HiddenLayer

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HiddenLayer raises a $100 million Series B for AI runtime security

The AI-security company HiddenLayer announced a $100 million Series B led by Delta-v Capital, with Ten Eleven Ventures, Morgan Stanley, Microsoft's M12 and Booz Allen participating, following a $50 million Series A in 2023. The company told TechCrunch its annual recurring revenue grew more than tenfold over the past year, into the tens of millions of dollars, with more than 90% of the growth from new customers, and said the round funds agentic runtime security aimed at AI coding agents. No valuation was disclosed.

Reported by pressTechCrunch ↗ ·

Agent skill metadata fields can suppress permission prompts and hide a skill from the user

HiddenLayer reports that a Claude Code skill's allowed-tools frontmatter field bypasses permission requests for tools including Bash, that setting user-invocable to false keeps a skill out of the menu while leaving it available for background use, and that project memory files can be written without a permission request. It also shows a denial-of-wallet path, with one URL-summary task costing $0.0274 on a small model at low effort and $0.1451 when the skill specifies a larger model at high effort. The write-up records no vendor acknowledgement or fix.

Reported by researchersHiddenLayer ↗ ·