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The Gemini app accepts custom remote MCP servers as connected apps. You set it up on the web; afterwards it’s also available in the Gemini mobile app.
1

Open Connectors in English

Open gemini.google.com/customize/connectors?hl=en.
The option to add a custom connector currently appears only with the Gemini interface in English. With ?hl=en you don’t need to change your account language.
2

Add a custom app

Use the option to add a custom app or connector and enter the URL:
3

Approve and sign in

On LePosta’s consent page click Permitir (Allow), then sign in to GitHub and authorize LePosta.
4

Use it

Try “Note down that I need to renew my passport” and then “Do I have postas?” from Claude or any other connected client: it’s the same inbox.
Gemini identifies itself to LePosta as Gemini (shown as the source of the postas it creates).