Proofsource and Codex: the plugin is coming soon

The Proofsource plugin for Codex is coming soon: join early access and we tell you when it opens. It will connect Codex to your Proofsource workspace over MCP and add two skills, ai-visibility-audit and fix-plan, so you can read gaps, plan fixes and mark them shipped from Codex. The MCP server works with Codex today.

Join early access See it in Proofsource

Coming soon

Visit openai.com ↗

app.proofsource.co/integrations

Plugin package

Coming soonAI assistants

Part	What it does	Status
MCP connection	Points Codex at your Proofsource workspace	Works today
ai-visibility-audit	Sourced summary of visibility, competitors and cited sources	With the plugin
fix-plan	Turns open gaps into a prioritized plan	With the plugin
Writes	Tracking a question or marking a fix shipped asks first	Always

Join early access from the Integrations page. The MCP server already works with Codex.

Sample data

What the Codex plugin adds, shown on the Integrations directory as coming soon.

Proofsource and OpenAI Codex plugin, in short

The facts, ready to quote.

Stage: Coming soon; the MCP server works with Codex today
Connects with: The Proofsource MCP server, plus a plugin that sets it up in one step
Skills added: ai-visibility-audit and fix-plan
Access it needs: A Proofsource sign-in or a workspace API key; writes always ask first
Today: No in-app card; add the Proofsource MCP server to Codex
Related: The OpenAI agents and any MCP client pages are live

Coming soon Coming soon means the Codex plugin is not open yet. The Proofsource MCP server already works with Codex today, with the same tools.

Why we love OpenAI Codex plugin

In the makers' own words, from their own pages. Proofsource builds on it, never around it.

MCP in Codex

Codex connects directly to MCP servers to reach tools and information in other systems, and the setup is shared across the desktop app, CLI and IDE extension.

From developers.openai.com

Skills that make workflows repeatable

A Codex skill is a folder with instructions, resources and optional scripts, so a task like an audit runs the same careful way every time.

From developers.openai.com

One agent across surfaces

Codex brings the same agent to the app, the command line and your editor, so a setup you make once is available wherever you work.

From developers.openai.com

How Proofsource uses OpenAI Codex plugin

Coming soon: connect Codex to Proofsource with a plugin that adds two AI visibility skills.

Connect
The plugin sets up MCP
One install points Codex at the Proofsource server, so there is nothing to paste.
Know
The audit skill
ai-visibility-audit gives a sourced summary of visibility, competitors, cited sources and recent changes from your workspace.
Act
The fix-plan skill
fix-plan turns open gaps into a prioritized plan, and asks first before tracking a question or marking a fix shipped.
Prove
Verification afterwards
Fixes marked shipped are checked by Proofsource against the same questions, engine by engine.

How to join early access

Use the MCP server today
While the plugin is not open, add the Proofsource server to Codex as an MCP server using the URL under Settings, Connect AI apps, For developers.
Sign in with your account
Authenticate with Proofsource when Codex asks, or use a workspace API key for an unattended agent.
Ask for the plugin
Request early access from the Integrations page. When it opens, installing it adds the same connection and both skills in one step.

Codex with Proofsource

$ codex

Run an AI visibility audit for Northwind Bikes

Northwind is named in 31% of tracked ChatGPT answers. Two competitors lead on touring bikes. Top gap: no comparison page. Want a fix plan?

Sample data

What the audit skill will answer once the plugin is installed.

What you unlock with OpenAI Codex plugin

Two skills coming

The audit and fix-plan skills arrive with the plugin.

Works over MCP now

The Proofsource MCP server already connects to Codex.

Writes ask first

Tracking a question or marking a fix shipped always asks.

Google AI Overviews

Google AI Mode

Questions about Proofsource and OpenAI Codex plugin

Can I install the Proofsource plugin in Codex today?

Not yet. The plugin is coming soon, and there is no one-click card in the app. You can connect Codex to the Proofsource MCP server today and get the same tools.

What will the plugin add?

A connection to the Proofsource MCP server and two skills, ai-visibility-audit for a sourced summary of your visibility and fix-plan for a prioritized plan from your open gaps.

What does Coming soon mean?

The plugin is not open yet. Until it is, the MCP server gives Codex the same tools.

What access will it need?

The same as any MCP client: a Proofsource sign-in or a workspace API key. Reads are open and writes always ask first.

How will I disconnect it?

Revoke the app under Connected apps in Proofsource settings or delete the API key; the next request is refused.

How will this help my AI visibility?

It moves gaps found in ChatGPT, Perplexity and other engines into the tool where the fix gets built, then checks whether the answers changed.

Which AI engines does Proofsource check?

Up to 10 depending on your plan: ChatGPT, Perplexity, Claude, Google AI Overviews, Google AI Mode, Gemini, Microsoft Copilot, Grok, DeepSeek and Meta AI. The free scan and trial run four.