Launch HN: Alter (YC S25) – Access control for multi-user agents

Alter, a YC S25 startup, provides access control and credential management for AI agents. The platform authenticates, authorizes, and audits every action agents take, giving each agent its own scoped identity and permissions rather than sharing a single master credential across all agents. This approach enables security teams to enforce least-privilege policies, maintain audit trails, and pass customer security reviews.