M91

M91 gives AI agents or software a way to get human approval. Your agent sends one HTTP request, and the right person gets an alert on their phone with Approve / Reject buttons; it keeps notifying until someone responds, and their answer goes straight back to the agent. Free forever, built by MSG91. Alerts break through silent mode and Do Not Disturb, and for high and critical alerts M91 phones people if nobody responds. Works with webhooks, n8n, Zapier, Make, LangGraph, CrewAI, OpenAI Agents SDK and Claude Code (agent skill: npx skills add MSG91/m91-skill). iOS and Android apps.