Give Claude Code, Cursor and ChatGPT the same project context

Each coding assistant has its own context file: CLAUDE.md, Cursor rules, a ChatGPT project. Write the shared part once as a bubble, and every tool reads the same version.

Updated Nov 2, 2026 · Written with AI help

Write the brief once

Keep it short: what the project is, the stack, the conventions, and what's off limits.

brief.md

# Acme API: brief for AI assistants
- TypeScript, Hono on Cloudflare Workers, Postgres through Supabase.
- Run npm test before calling a change done.
- Never edit a migration that has shipped; add a new one.
- Errors go back as { status: "ERROR", error_info }, never as a thrown 500.

Paste it on your bubbles page, or save it from the terminal:

Terminal

npx sixteenbridges login
npx sixteenbridges save "Acme API brief" brief.md

Connect each tool

One remote MCP server serves every app. Desktop editors can run it locally through the CLI instead, with no connector and no paid plan.

Claude Code

Terminal

claude mcp add --transport http sixteen-bridges https://mcp.sixteenbridges.com/mcp

In Claude Code, run /mcp, pick sixteen-bridges and sign in. Allow it on sixteenbridges.com.

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "sixteen-bridges": {
      "command": "npx",
      "args": [
        "-y",
        "sixteenbridges",
        "mcp"
      ]
    }
  }
}

First, sign this computer in once: npx sixteenbridges login
Add this to ~/.cursor/mcp.json (or Settings → MCP → Add), then reload.

Codex

Terminal

codex mcp add sixteen-bridges --url https://mcp.sixteenbridges.com/mcp
codex mcp login sixteen-bridges

The login opens your browser: Allow it on sixteenbridges.com.

ChatGPT

Turn on Developer mode: Settings → Apps (or Connectors) → Advanced settings.
Create an app or connector named Sixteen Bridges with the URL https://mcp.sixteenbridges.com/mcp and OAuth sign-in.
Allow it on sixteenbridges.com, then turn it on in the chat.

Developer mode is on paid plans, and saving or editing bubbles from ChatGPT may need a Business or Enterprise plan. Workspace admins may need to allow custom apps first.

VS Code, Windsurf, Gemini CLI and the rest: steps for each app.

Use it, keep it current

Start a session with one line:

Prompt

Read my bubble "Acme API brief" and follow it.

When the project changes, update the bubble from whichever tool you're in, for example: “Add to my Acme API brief: we moved to Drizzle.” Every tool reads the new version the next time it opens it.

Bubbles are stored as plain text, not end-to-end encrypted. Keep keys, passwords and secrets out of them.