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The Addison plugin puts Summation’s AI data analyst inside OpenAI Codex. It’s built on Codex’s plugin marketplace and shares the same skills as the Claude plugin, so the experience matches: install from a marketplace, sign in once in your browser, then ask data questions in plain English. No API keys, no secrets pasted into chat — everything runs as you, against your Summation workspace. Skills are invoked with Codex’s $ mentions (for example $addison-start), or picked up automatically when your request matches.

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Installing Addison for Codex CLI

1

Add the Summation marketplace

2

Install the plugin

From the /plugins menu inside Codex, or the command line:
3

Sign in

Addison shows a sign-in link and a short verification code:
Open the link, approve in your browser, and you’re connected. Sign-in also registers the hosted Summation MCP server in ~/.codex/config.toml for you — start a new Codex thread (or restart Codex) to load the tools.
4

Take the tour

A guided first run: a map of your connected data, an introduction to Addison, and your first report.

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Commands

You don’t need commands for most work — just ask data questions in plain English and Addison picks them up.

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Installing Addison for the Codex app

The Codex app adds a plugin marketplace through a dialog rather than the command line. The steps are the same underneath — add the marketplace, install Addison, sign in.
1

Open Add plugin marketplace

In the Codex app, open the plugins area and choose Add plugin marketplace.
Screenshot needed: Codex app plugins area with the “Add plugin marketplace” button
2

Point it at the Summation repository

Fill in the dialog:Then choose Add marketplace.
Screenshot needed: “Add plugin marketplace” dialog filled in with the Source and Git ref above
3

Install Addison

Open the Summation marketplace and install Addison.
Screenshot needed: Summation marketplace listing showing the Addison plugin with an Install button
4

Sign in

Start Addison and type $addison-start (or $addison-signin). Approve the sign-in link in your browser, and Addison connects and shows a map of your data.
Screenshot needed: Codex app chat showing the Addison sign-in link and verification code

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Troubleshooting

Your session expired or was never completed. Run $addison-signin again — it takes seconds.
Codex loads MCP tools when a thread starts. Start a new Codex thread, or restart Codex, after $addison-signin.
Report generation and validation are thorough and can take a minute or two. Addison tells you it’s working — this is normal, not a hang.
The plugin is production, browser-sign-in only — the right default for almost everyone. For machine-to-machine access, see the Public API or the CLI, or contact your Summation representative.