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Connect

1

Ask Codex to add everydeck

Paste this into Codex in the folder of your app, with the address https://app.everydeck.ai/mcp (also shown on the setup page):
2

Sign in

Codex opens the sign-in in its own browser. Sign in to everydeck there and click Allow.
3

Restart and open a new chat

Restart Codex and open a new chat in this folder. The everydeck tools are only there after a restart, in a new chat.
4

Paste the sentence

Paste the sentence from the setup page into the new chat.
Other way: in Codex, go to Settings › MCP servers › Add server, choose Streamable HTTP, paste the address, save, restart and click Authenticate. Using the Codex CLI? The setup page shows the two commands: codex mcp add everydeck --url <address> and codex mcp login everydeck.

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Model

everydeck was tested with GPT-6 Astra at medium reasoning. With another model the setup may leave parts out; everydeck shows you what is still open.