MCP fixes

The configuration errors and silent failures that show up the first time you wire an MCP server into an AI client. Each page is a focused, copy-paste fix.

Cursor: bearer token or 401 from a remote MCP server

How to pass a bearer token in your Cursor mcp.json and what to check when the server returns 401. Prefer OAuth where the server supports it.

Claude Desktop: MCP tools do not appear after restart

Where the config file lives, why npx needs -y, and the log lines that show the real error.

ChatGPT: custom MCP connector returns no tools

Plan gating, dev mode, and the per-chat toggle to check when ChatGPT cannot see the server.

Claude Code: MCP OAuth loops or never finishes

Transport flag, callback port, and the claude mcp list checks for a stuck OAuth handshake.

VS Code with Copilot: wrong root key in mcp.json

servers vs mcpServers, the right file location, and how Copilot Chat surfaces MCP tools.

MCP: SSE timeout or unexpected disconnect

Why long-lived SSE connections drop, when to switch to Streamable HTTP, and what to check on a proxy.

Stuck on something not listed here? Run the MCP Config Validator to catch JSON errors in your browser, or read the MCP server reference for endpoint, transport, and OAuth details.

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Works with Claude and ChatGPT today. Gemini coming soon.