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Publishing uses one MCP: the Summer Engine MCP. It comes in two forms with the same publishing tools: Claude Code and Codex on your computer use the summer-engine npm MCP, which exports with Summer Engine on your disk and carries every hosted tool. Claude and ChatGPT in the browser use the same MCP hosted at mcp.summerengine.com. Both reach the Summer Games store. Claude Code and Codex on your computer use the summer-engine npm MCP, which exports with Summer Engine on your disk and carries every hosted tool. Claude and ChatGPT in the browser use the same MCP hosted at mcp.summerengine.com. Both reach the Summer Games store. A chat app in the browser cannot reach your computer, so it cannot export. Export there with Summer Engine yourself, or use an agent on your computer.
Agent publishing is rolling out. It is available to invited creators while the store opens it to everyone.

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On your computer: Claude Code, Codex and others

1

Add the Summer Engine MCP

Run the setup for your agent. It writes the MCP config and installs the Summer skills.
Other agents: MCP setup.
2

Sign in to the store

Once per computer:
Your browser opens. Sign in to your Summer account and choose Allow.
3

Restart your agent

The MCP now lists the publishing tools next to the engine tools: summer_store_*, summer_build_*, summer_upload_image_* and more.
The publishing tools need summer-engine 3.3.0 or later. npx -y summer-engine@latest always runs the newest version. The store sign-in is saved in ~/.summer/oauth-token and renews itself. During sign-in the MCP listens on port 47615, 47616 or 47617. Keep one of them free.

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In the browser: Claude

1

Add the connector

On claude.ai or in Claude Desktop, open Settings → Connectors and choose Add custom connector.
2

Paste the address

Name it Summer Engine and paste https://mcp.summerengine.com/mcp. Choose Add.
3

Sign in

Claude opens summerengine.com. Sign in to your Summer account, check the app name, and choose Allow.
The connector then works in every Claude app with the same Claude account, the phone app too.

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In the browser: ChatGPT

1

Add Summer Engine

On chatgpt.com, add a custom MCP server (connector) with the address https://mcp.summerengine.com/mcp and OAuth sign-in. ChatGPT may ask you to turn on developer mode first; where that setting lives changes, so check OpenAI’s help if you do not see it.
2

Sign in

ChatGPT opens summerengine.com. Sign in, check the app name, and choose Allow.

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What the agent may do

When you sign in, you let the agent act as you on the store, with one limit: it cannot publish. A submit from an agent waits for you to click Approve publishing. The store refuses any other publishing step from an agent. See Approve publishing.

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Let your agent set itself up

Connect yourself to Summer for publishing. Your agent adds the Summer Engine MCP and tells you the one sign-in to do.

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Check it works

Ask your agent: “List my Summer projects and my Summer Games store games.” It calls summer_list_projects and summer_store_list_games. If it says the store did not accept its sign-in, see Troubleshooting.
Does this not help you? Reach out on Discord!