What problem does it solve? AI agents cannot access authenticated APIs without handling raw credentials, which creates security risks and manual login friction. This Skill manages browser SSO logins, OAuth2 flows, and credential injection so agents call protected APIs without ever seeing secrets. ## Core Features & Use Cases - Browser SSO Authentication: Log in to any website or enterprise SSO provider with sig login, with automatic provider provisioning and validation rules. - Encrypted Credential Storage: Extracts cookies, localStorage tokens, and OAuth2 tokens, encrypting them locally with AES-256-GCM in ~/.sig/credentials/. - Transparent Auth Proxy & Requests: Inject credentials into HTTP calls via sig request, sig run, or a MITM proxy on sig proxy --port 8080. - Use Case: An agent needs to query Jira issues. After a one-time sig login https://jira.example.com, the agent runs sig request https://jira.example.com/rest/api/2/issue/PROJ-123 and receives authenticated JSON without handling any session cookies. ## Quick Start Install the CLI with npm install -g @sigcli/cli, then run sig login against your target site and use sig request to make an authenticated API call.