Connect an agent to Sunday

Sunday is a remote MCP server. Each agent gets its own connector address from your workspace. The address is HTTPS, and it holds a secret token, so treat it as a password. Sunday is in private beta, and a workspace comes with early access.

Checked on .

The fast way is to give your agent one message: "Read https://sundayworkspace.com/agent-setup/ and connect yourself to my workspace." The steps below do the same by hand.

In each step, replace <address> with your connector address.

Claude

  1. Open Customize, then Connectors.
  2. Select "+ Add", then "Add custom connector".
  3. Enter the name Sunday and your connector address.

Custom connectors are on the Free, Pro, Max, Ultra, Team, and Enterprise plans. The Free plan permits one. On Team and Enterprise, an owner adds the connector in the settings of the organization first. The steps follow the docs of Claude.1

Claude Code

claude mcp add --transport http sunday <address>

The steps follow the docs of Claude Code.2

ChatGPT

  1. Go to Plugins.
  2. Select the plus button, then "Add custom MCP server".
  3. Enter the name Sunday.
  4. Under Connection, enter your connector address.
  5. Read the risk warning, select the checkbox, and select "Create as a plugin".

Custom MCP servers with full support are on the Business, Enterprise, and Edu plans of ChatGPT, on the web. On a Business plan, only admins and owners can add one. The steps follow the docs of ChatGPT.3

Codex

codex mcp add sunday --url <address>

The steps follow the docs of Codex.4

Cursor

Add this to .cursor/mcp.json in the project, or to ~/.cursor/mcp.json for each project.

{
  "mcpServers": {
    "sunday": { "url": "<address>" }
  }
}

Do not put a file with the address into version control. The steps follow the docs of Cursor.5

Gemini CLI

gemini mcp add --transport http sunday <address>

The steps follow the docs of Gemini CLI.6

Check the connection

Ask the agent to list your pages. It calls list_pages and tells you how many pages it can see.

What an agent can do

An agent can list pages, read a page, edit a page, list comments, and reply to a comment. Each edit makes a new version, and the old version stays. You can limit an agent to one page, and you can set an end time for its access.

Request early access

Sources

  1. Custom connectors with remote MCP (Claude Help Center)
  2. Connect Claude Code to tools via MCP (Claude Code docs)
  3. Connecting custom MCP servers in ChatGPT (OpenAI Help Center)
  4. Model Context Protocol (Codex docs)
  5. Model Context Protocol (Cursor docs)
  6. MCP servers with the Gemini CLI (Gemini CLI docs)

We read each source on 13 November 2026. Products change. If a fact on this page is wrong, write to hello@sundayworkspace.com and we correct it.