Official setup guide

Connect Sekai MCP to Codex and Claude Code

Sekai MCP is the official Model Context Protocol server for creating games with AI assistants. Search game assets and upload a game to your private Sekai drafts.

Streamable HTTP MCP endpoint: https://mcp.sekai.ai/mcp

Use your own Sekai account to sign in and approve OAuth permissions in your browser. Setup and account authorization are required before your assistant can use Sekai MCP.

Claude Code

Run this in your Terminal — not inside Claude Code. --scope user is what makes Sekai available in every folder, not just this one.

claude mcp add --scope user --transport http sekai https://mcp.sekai.ai/mcp

Then start Claude Code, type /mcp, pick sekai and choose Authenticate. Sekai opens in your browser: sign in with the Sekai account you already play with, and approve it.

Same two steps if Sekai ever asks you to reconnect: /mcp → sekai → Authenticate.

Claude app

No terminal needed. In the Claude app or claude.ai: Settings → Connectors → Add custom connector, name it sekai, paste this address, then press Connect. Sekai opens in your browser: sign in with the Sekai account you already play with, and approve it.

https://mcp.sekai.ai/mcp

To reconnect later, open the same screen, disconnect sekai and connect it again.

Cursor

In Cursor, open Settings → Customize → MCP (or the command palette, "Open MCPs") and add a server called sekai with this address. Cursor writes it to ~/.cursor/mcp.json. Sekai opens in your browser: sign in with the Sekai account you already play with, and approve it.

https://mcp.sekai.ai/mcp

Prefer the file? Put {"mcpServers": {"sekai": {"url": "https://mcp.sekai.ai/mcp"}}} in ~/.cursor/mcp.json and restart Cursor.

Codex / ChatGPT

Two commands in your Terminal: the first adds Sekai, the second signs you in. If a browser does not open automatically, open the authorization link shown in the terminal.

codex mcp add sekai --url https://mcp.sekai.ai/mcp
codex mcp login sekai

Sekai opens in your browser: sign in with the Sekai account you already play with, and approve it.

In the ChatGPT desktop app instead: Settings → MCP servers → Add server, type Streamable HTTP, this address, save, restart, then click Authenticate. Same account either way.

Something else

Sekai works with any assistant that speaks MCP over streamable HTTP and can sign in through your browser. Give it this address — there is no API key to paste, and an assistant that only takes a fixed key cannot connect.

https://mcp.sekai.ai/mcp

Known commands: Gemini CLI gemini mcp add --transport http -s user sekai https://mcp.sekai.ai/mcp · Amp amp mcp add sekai https://mcp.sekai.ai/mcp · OpenCode opencode mcp add then opencode mcp auth sekai. Windsurf, VS Code, Zed, Kiro, Goose and Warp all take the address in their own MCP settings. Most of them open the browser the first time the assistant actually uses Sekai, not when you add it.

Then try: "Make me a one-tap game about a cat catching fish and put it in my Sekai drafts."

Try Sekai MCP

Ask your connected assistant: “Use Sekai MCP to make a one-tap game about a cat catching fish and put it in my Sekai drafts.” Play the draft in Sekai and publish when you are happy with it.

If Sekai MCP is missing, check the configured server and sign in again. A search result alone does not install or authorize an MCP connection.

Read the game creation guide · Official Codex MCP instructions · Official Claude Code MCP instructions