ChatGPT, Claude, Grok and any MCP assistant

Let your AI assistant find where Big Rank Theory can help.

Your AI assistant already holds a good picture of your professional context. With your explicit consent, it shares a short summary with Big Rank Theory. We review the challenges you describe and give you an honest view of where we can help. You can also submit an inquiry directly from the conversation.

01Connect your assistant

02Describe your work. Skip anything you prefer

03Review the summary and give your consent

04Receive your assessment and, if you wish, submit an inquiry

Use Big Rank Theory inside ChatGPTDownload this plugin, add it at chatgpt.com, then ask ChatGPT to find an assessment, guide you through it and help you contact Big Rank Theory when you are ready.

Download for ChatGPT

https://hub.bigranktheory.com/mcp/public

Prefer a manual connection? Copy this server address into ChatGPT or Claude. When prompted, sign in with Google or request an emailed sign-in link.

Connect in a minute

ChatGPT

1
Open chatgpt.com in a web browser. Use the web version for setup and your first conversation so the plugin tools load correctly.
2
Download the ready-to-install ZIP above. Keep it zipped.
3
In ChatGPT open Customize, then Plugins, press Add and choose Upload plugin archive.
4
Select the downloaded ZIP, review the permissions and install it.
5
Connect the plugin, sign in with Google or an emailed link, and press Allow.
6
Start a new chat, select ${brand}, and ask: "What can ${brand} help me with?"

If the desktop app does not show the plugin tools, continue the conversation at chatgpt.com.

Claude

1
Open Settings, then Connectors.
2
Choose Add custom connector and paste the server address above.
3
Select Connect, sign in, and approve access.

Claude Code: run

claude mcp add --transport http big-rank-theory https://hub.bigranktheory.com/mcp/public

then type /mcp to sign in.

Grok, Gemini and others

1
Open your assistant's settings and look for Connectors, Tools or MCP servers.
2
Add a remote MCP server and paste the server address above.
3
Choose OAuth if asked, then sign in and approve access.

Any assistant that supports remote MCP servers with OAuth works. If yours does not, contact us and we will help.

If archive upload is unavailable on your plan, choose Add custom MCP server, name it big_rank_theory, paste the server address above, and choose OAuth with Dynamic Client Registration. Menus differ by plan and change often.

Signing in

Is there a "Log in with ChatGPT" button?

No. ChatGPT and Claude do not act as an identity provider for other sites. When you connect, you are directed to a short Big Rank Theory sign-in page. Continue with Google, or request a sign-in link by email. Your assistant never sees your password.

Why do I have to sign in?

So your answers belong to you and we know who completed an assessment. We store your email, your answers and whether you finished. Nothing else about you or your AI account.

Available now

Where can Big Rank Theory help?
A short conversation to identify where Big Rank Theory can help, run in your own AI assistant. You decide what is shared.

Try asking

Start the "Where can Big Rank Theory help?" assessment.

Help me describe my work and where Big Rank Theory could help.

Submit an inquiry to Big Rank Theory about the challenge we just discussed.

List the Big Rank Theory assessments I can take.

What your assistant can do

List assessments: see what is available.
Start an assessment: loads the context and instructions, then runs it as a conversation.
Record your answers: saved as you go, in your own words.
Share your professional context: a short summary that you have reviewed and approved, so we understand your work.
Submit an inquiry: your assistant drafts it with you and sends it to Big Rank Theory only after you approve it.
Complete the assessment: stores a short summary and any result or score.

Safety and privacy

Nothing is shared without your explicit consent. Your assistant shows you the summary or message first and sends it only after you agree.
You approve access when you connect, and you can disconnect from your AI app at any time.
Only what you choose to share during an assessment is stored. Big Rank Theory cannot read your ChatGPT or Claude history.
You may ask us to delete your answers at any time by contacting us through the website.
Connections are limited to Big Rank Theory assessments. This server cannot reach your other apps or files.

For site owners

Manage Big Rank Theory from ChatGPT

Site owners can use a separate connection to review inquiries, read conversations, prepare replies, update lead status and see every assessment. Add it from ChatGPT on the web with an approved owner account:

https://hub.bigranktheory.com/mcp

Only approved site owners can connect to this workspace.

For developers

Endpoints and limits

Visitor transport: stateless Streamable HTTP (POST https://hub.bigranktheory.com/mcp/public), JSON responses.
Private owner transport: POST https://hub.bigranktheory.com/mcp.
Discovery: /.well-known/oauth-protected-resource and /.well-known/oauth-authorization-server.
OAuth 2.1 with PKCE (S256) and dynamic client registration at /oauth/register. Public clients, no secret.
Access tokens last one hour. Refresh tokens rotate on use and last 30 days.
Rate limit: 30 requests per minute per address.