Claude and ChatGPT

Both add Weir as a connector and sign in with OAuth. Neither can send an API key, so there is no key to create.

Claude

Works in Claude on the web, Claude Desktop, and the mobile apps. The connector is added once and follows your account.

Pro and Max: open Customize, then Connectors, then + Add, then Add custom connector. Team and Enterprise: open Organization settings, then Connectors, then Add, then Custom, then Web. On Team, only Owners can add one.
Name it Weir and paste the URL:
```
https://api.weirapp.io/mcp
```
Leave the authentication settings as Claude detects them, and connect. Claude opens Weir's consent screen. Sign in and approve.

Check: in a new chat, ask "What's my Weir usage?" Claude should call get_usage.

Things to know:

Claude reaches the server from Anthropic's cloud, not from your machine. The URL has to be public, so a local API will not work here.
claude_desktop_config.json is for local servers. Do not put this URL in it.
The Free plan allows one custom connector.
If you sign in to Claude Code with the same Claude account, connectors added here show up there too.

Claude's guide to custom connectors

ChatGPT

Custom MCP servers are available on ChatGPT Business and Enterprise/Edu, on the web. Pro accounts can connect one with read and fetch permissions. On Business, only admins and owners can add one.

Go to chatgpt.com/plugins, click +, and choose Add custom MCP server.
Name it Weir, set the server URL, and choose OAuth for authentication:
```
https://api.weirapp.io/mcp
```
Accept the warning, choose Create as a plugin, and install it. Sign in to Weir and approve when asked.
In a chat, mention @Weir to use it.

You do not need to turn on developer mode first.

Check: ask "@Weir what's my Weir usage?" ChatGPT should call get_usage.

When Weir adds tools, open the plugin and use Refresh. A plugin published to a workspace keeps the tool list it was created with until an admin refreshes it.

OpenAI's guide to custom MCP servers