1S2U — SMS sending and number validation

integrations

1s2u is a Claude Code skill that connects Claude Code to the 1S2U platform via the Membrane CLI, enabling SMS sending, HLR mobile number lookup, and account balance checks. Three core actions are available — send-sms, hlr-lookup, and check-balance — discoverable through natural-language search with membrane action list. Membrane handles authentication and credential refresh automatically, removing the need to manage tokens manually. For use cases beyond the built-in actions, the skill supports direct proxy requests to the 1S2U API via the membrane request command. It is well-suited for developers automating SMS campaigns, validating mobile numbers, or integrating 1S2U workflows without dealing with auth plumbing.