Alter launches on HN with a credential proxy that checks each agent call against the user it acts for
Launched Oct 21 (YC S25), Alter sits between shared internal agents and downstream APIs, keeping credentials in its vault and evaluating default-deny, per-parameter policies against the end user each request is made for, with approval for risky calls and audit logs. In proxy mode the token never reaches your agent process; the team also published an OpenClaw plugin (docs).