Get WhatsApp Pings from Claude Code with MCP Reminders

Coding agents got good enough to work unattended — and created a new problem. You kick off a long refactor or a flaky CI run, switch to something else, and there's no good way for the agent to reach you when it's done. Terminal bells don't follow you to lunch. Email is where notifications go to die.

The fix: give your agent a way to message the one app you actually check. Mobius exposes an MCP server, so Claude Code — or any Model Context Protocol client — can set real WhatsApp reminders on your phone.

What is MCP, in one paragraph

The Model Context Protocol is an open standard that lets AI agents call external tools through a common interface. An MCP server describes its tools (name, parameters, behavior); any MCP client — Claude Code, Claude Desktop, and a growing list of others — can discover and invoke them mid-conversation. Mobius's server exposes reminder tools backed by the same infrastructure as the Mobius WhatsApp assistant itself.

What it looks like in practice

Inside Claude Code, you just say what you want:

› remind me on WhatsApp in 30 min to check the deploy

The agent calls the Mobius tool:

⏺ mobius-reminders — create_reminder
  { task: "Check the deploy", in: "30 minutes" }

✓ Reminder set — WhatsApp ping at 6:42 PM

Thirty minutes later your phone buzzes with a WhatsApp message. Not a desktop toast you missed, not an email in a filtered folder — a message in the app that survives you leaving your desk.

Workflows this unlocks

• Long-running builds and deploys. "Kick off the migration, remind me in 45 minutes to verify row counts."
• Agent handoffs. An overnight agent run schedules a morning ping summarizing what needs review.
• Timeboxing. "Remind me in 25 minutes to stop rabbit-holing on this bug."
• Anything cron-shaped but personal. Weekly dependency-update nudges, standup prep every Monday — the same recurring reminders Mobius handles in chat, but created programmatically.

Agents can create, list, edit and cancel reminders, so a workflow can clean up after itself too.

Setup

Mobius is in invite-only early access, and MCP access rides on the same account as the chat assistant:

1. Join the waitlist and get your Mobius invite on WhatsApp.
2. Request an API key from Mobius (early-access users can ask right in the chat).
3. Add the mobius-reminders MCP server to your Claude Code configuration with your key.

Your API key maps to your WhatsApp number — same backend, same data, same privacy guarantees as the chat.

One assistant, two interfaces

The interesting part isn't reminders — it's that your assistant now has two front doors. You talk to Mobius on WhatsApp; your agents talk to it over MCP; both write to the same brain. Log expenses by texting or snapping receipts, keep notes and lists in chat, and let your tooling schedule the pings that keep projects moving.

See everything the assistant side does on the features page, or get on the waitlist — the MCP server is included in early access.