sigcli Auth Proxy Skill

Skill by ara.so — Devtools Skills collection.

Overview

sigcli is an authentication CLI and proxy that handles browser-based SSO, OAuth2 flows, and credential injection for AI agents. It extracts credentials (cookies, localStorage, OAuth tokens), encrypts them locally with AES-256-GCM, and injects them into HTTP requests — so agents can access authenticated APIs without ever seeing secrets.

Key capabilities:

• Browser SSO authentication for any website/SSO provider
• OAuth2 Client Credentials flow with automatic token refresh
• Encrypted credential storage (~/.sig/credentials/)
• Transparent HTTP proxy for agents (sig proxy)
• Direct authenticated requests (sig request)
• Command execution with injected credentials (sig run)
• Multi-provider support in single commands

Installation