Obsidian Security for AI Agent Security: Features, Pricing, and Alternatives

Obsidian Security, initially a SaaS security platform for large enterprises, expanded its capabilities in 2025 to include AI agent security. Founded by a former Cylance CTO, the company raised $20M in a Series B round in 2019. Obsidian's platform, appreciated by clients like Snowflake and T-Mobile, combines SaaS Security Posture Management (SSPM), Identity Threat Detection and Response (ITDR), and an AI Threat & Risk Management module, earning it recognition as a Forrester Strong Performer. The platform's core strength lies in its observability, leveraging a "Knowledge Graph" to monitor and analyze behavioral patterns in SaaS applications, identifying threats like excessive permissions, shadow AI usage, and OAuth token theft. While Obsidian excels in monitoring and anomaly detection post-authentication, it lacks the authentication infrastructure provided by companies like WorkOS, which offers comprehensive solutions including SSO, MFA, and directory sync, essential for enterprises before deploying AI agents securely. Obsidian's freemium model offers basic visibility, with advanced capabilities available through custom enterprise pricing, offering valuable insights into SaaS security posture but requiring complementary identity management solutions for comprehensive security.