Install CyberFox Brain

CyberFox Brain connects to any MCP-capable AI host as a single remote server. There is no API key to paste. You sign in with the same account you use everywhere else. In a hurry? The Quickstart is the short version.

What “last verified” means below

Each host section below identifies whether its steps were verified in a live host session or from that host’s official documentation. Host availability, controls, and menu labels can change independently, so follow the linked official source if your screen differs.

Connector URL

https://mcp.cyberfoxai.com/mcp

Claude

Last verified from official documentation: 2026-09-09. See Anthropic’s custom connector guide.

  1. Open Settings → Connectors → Add custom connector.

    Claude Settings, Connectors tab, with the 'Add custom connector' dialog open showing a Name field and a Remote MCP server URL field

  2. Paste the connector URL: https://mcp.cyberfoxai.com/mcp

  3. Claude opens a Google or email-magic-link sign-in. Approve it, and the connector is ready. No token to copy anywhere.

    Browser OAuth consent screen for CyberFox Brain, showing the requesting connector name and an Allow button, immediately before Claude reports the connector connected

ChatGPT

Last verified from official documentation: 2026-09-09. See OpenAI’s Developer mode and MCP apps guide.

  1. Use ChatGPT on the web. Custom MCP apps and Developer mode vary by plan, workspace, and administrator policy. Full MCP support, including write actions, is currently in beta for Business, Enterprise, and Edu workspaces. Pro accounts can connect MCP apps with read and fetch permissions in Developer mode.

    ChatGPT Apps settings, showing the Developer mode control available to an authorized workspace user

  2. An authorized workspace admin or developer enables Developer mode using the path for their plan, then opens Apps → Create from workspace or user settings. Add the connector URL, choose OAuth when prompted, select Scan Tools, complete the authorization prompt, and select Create.

    ChatGPT Apps create screen for a remote MCP server, with the CyberFox Brain connector URL entered before tool scanning

  3. The new app is a draft until a workspace admin or owner publishes it. To use a draft, start a chat and select it from ChatGPT’s tools menu. App selection applies to the message that uses it; select or mention it again when a follow-up needs fresh data or another action.

  4. ChatGPT does not automatically apply later tool changes. An admin or owner must review and publish an update; Business workspaces may need to recreate and republish a published app, while Enterprise and Edu workspaces can refresh actions in workspace settings.

Codex

Last verified from official documentation: 2026-09-09. See the official Codex MCP guide.

  1. In a terminal, add the CyberFox Brain MCP server:

    codex mcp add cyberfox-brain --url https://mcp.cyberfoxai.com/mcp

  2. Then sign in through the OAuth flow:

    codex mcp login cyberfox-brain
    Terminal output of `codex mcp login cyberfox-brain` after a successful browser OAuth approval, showing the CLI's own confirmation line

  3. The official guide documents separate setup paths for the Codex CLI, IDE extension, and config.toml. Use the path for the Codex surface where you work; do not assume a connection configured in one surface is automatically available in another.

Another MCP client

Last verified against the connector endpoint directly: 2026-09-09. This is a protocol-level check, not a specific third client’s UI.

Any MCP client that supports a remote, OAuth-authenticated server can connect. Add a remote server pointed at the connector URL above, then complete the OAuth sign-in your client opens in a browser. If your client asks for a transport, this server speaks Streamable HTTP.

Verify the connection

Start a new conversation, attach or select CyberFox Brain where your host requires it, and ask: “What should I know before working on my brain?” A healthy connector reaches for start_here before it reads or changes notes.

Something not connecting? See Troubleshooting.

Make CyberFox your default context

This optional, recommended instruction helps your AI remember to check your brain when a request may relate to your work. It is a pointer to the connector, not a replacement for your brain’s conventions.

Where do you use CyberFox Brain?

The instruction

I use CyberFox Brain as my source of truth for projects and durable context. When a request may relate to my work, use the CyberFox Brain connector: call list_brains when the relevant brain is unclear, then call start_here before reading or changing notes. Record durable context before finishing.

Add it to your Claude personal preferences.

This is a convenience, not a guarantee that a model will call a tool. When it does reach your brain, start_here and that brain’s BRAIN.md remain the source of its rules and conventions.

Your data

Every brain can be exported as a plain-markdown zip from the web app, and a folder of markdown can be imported back in with a preview before anything is written. What exactly is in an export, how import conflicts are handled, and the current size limits are covered in full on Data.