Prompt Security
Prompt Security provides an AI security platform that protects enterprise AI usage, applications, and agents.
- Categories
- AI and LLM security
- Based in
- Tel Aviv, Israel
- Founded
- 2023
- Ownership
- Part of SentinelOne since 2025
About Prompt Security
Prompt Security is a security company focused on AI. It provides tools and resources to help security teams understand and respond to AI threats. The company offers open-source tools for securing AI agents and testing system prompts. It also publishes research and guidance on AI security topics such as agentic AI, ChatGPT risks, and AI attack surfaces. Prompt Security serves security teams in organisations. Its tools include ClawSec, which secures AI agent skills, OneClaw, which provides visibility into OpenClaw deployments, and ps-fuzz, which tests system prompt resilience. The company also offers a glossary and blog with analysis on AI security. It tracks metrics such as prompts per day and guardrails triggered in organisations of 500 to 1,000 employees.
Products
- ClawSecA security skill suite for AI agents that detects drift, gives live recommendations, performs automated audits, and verifies skill integrity.
- OneClawA tool for tracking and analysing OpenClaw deployments across an organisation, providing visibility into agent activity and usage patterns.
- ps-fuzzA tool that tests and hardens system prompts against dynamic LLM-based attacks, supporting 16 providers and 16 attack types.
Ownership and deals
Companies owned by SentinelOne lists both in the directory, with the deals on record.
- SentinelOne acquired Prompt Security for $250mReport on SentinelOne buying Prompt Security (opens in a new tab)
- Raised $18m in a Series A roundInvestor Jump CapitalReport on the Prompt Security funding round of November 2024 (opens in a new tab)
- Raised $5m in a seed roundInvestor Hetz VenturesReport on the Prompt Security funding round of January 2024 (opens in a new tab)
Acquisitions come from SecurityWeek's monthly M&A round-ups from 2021 onwards, from Cybersecurity Ventures' quarterly M&A reports for 2020, and a few from Wikipedia lists. Funding rounds from 2022 onwards come from Return on Security's weekly Security, Funded newsletter. These are dated to the month. A few deals added from the news are dated to the day. Smaller deals may be missing. Amounts are in US dollars.