Short answer
To use a remote MCP server, add its address to your assistant and sign in. In Claude, add a custom connector. In ChatGPT (Plus, Pro, Business, Enterprise or Edu, on the web), turn on developer mode and create an app with OAuth. In Microsoft Copilot Studio, add a Model Context Protocol tool to an agent and publish it to Teams. Developer tools (Claude Code, Codex, GitHub Copilot, Cursor) take the address plus a bearer key in a config file or one command.
Claude
Add a custom connector with the server's address, sign in, and choose what it may do. For Fieldproxy the sign-in lasts an hour and renews itself for 30 days. In Claude Code: claude mcp add --transport http <name> <address> --header "Authorization: Bearer <key>".
ChatGPT and OpenAI Codex
On the web, open Settings, Security and login, turn on Developer mode, then create a developer-mode app with the address and OAuth with dynamic client registration. ChatGPT asks before each write action by default.
Codex: codex mcp add <name> --url <address> --bearer-token-env-var <ENV_VAR>, or add the server without a key and run codex mcp login <name>.
Microsoft Copilot Studio (Teams and Microsoft 365 Copilot)
In your agent: Tools, Add a tool, New tool, Model Context Protocol. Enter a name, a one-line description (the agent uses it to decide when to call the server) and the address. Choose OAuth 2.0 with dynamic discovery, or an API key in the Authorization header. Create the connection, add it to the agent and publish to Teams and Microsoft 365 Copilot. Copilot Studio needs its own licence, and a Power Platform data policy can block the connection.
GitHub Copilot and Cursor
GitHub Copilot in VS Code reads servers from .vscode/mcp.json and can prompt for the key once. Cursor and other JSON-config clients take an mcpServers entry with the url and an Authorization header.
Fieldproxy facts on this page come from the Fieldproxy MCP reference. Competitor details are from each vendor's own documentation as of September 27, 2026; see the comparison table and sources.