Alter

Alter (YC S25) is the security and control layer for the autonomous software era. As AI agents begin acting across critical systems and data, organizations need a foundation that keeps every action secure, intentional, and accountable. Alter provides unified governance over how agents obtain and use access tokens, enabling adaptive, least-privilege access in real time.

The platform issues short-lived OAuth tokens, enforces fine-grained permissions, and performs continuous policy checks to ensure agents stay within defined boundaries. Every token request, tool invocation, and LLM call is fully traced, delivering end-to-end transparency and compliance across all AI operations.

By giving companies precise control and visibility into every AI action, Alter makes it possible to deploy autonomous agents safely and at scale.