I need a way to pass api key to MCP server. This is not needed for cli mcp but when we add an SSE mcp we should have an additional box called API key and then cursor ahould pass it as authroization or X-API-Key header when making requests to the sse and messages endpoints.

Yes I agree. So have to wait for cursor to support sending env to server.

I see an option to set the API key in the new settings Cursor – Model Context Protocol However this api key is not being sent in headers with each request.

There are also other minor glitches with MCP. For example even though server is at port 8007, cursor for some reason tries to connect to port 8006 [image]

@mkschreder yes, see my comment above. This is probably just a copy-paste mistake

Plus I think the client should implement reconnect when server disconnect. I’m facing the issue that when server is deployed with a new version, cursor will simply disable the mcp server. It will be pretty common the server needs updates once in a while.

I actually just tried cline mcp sse with headers yesterday but no luck. :melting_face:

Being able to add/customize headers like vscode has exposed would be the most practical approach for now. The SSE standard includes OAuth 2.0, and suggests a number of features like dynamic client registration which can be pretty complicated to implement. It would be great to have something for mo…

+1 this has halted my teams progress

workaround for now is using supergateway as it has --header when connecting to sse and converting to STDIO that cursor supports. Like: { "mcpServers": { "supergatewayExample": { "command": "npx", "args": [ "-y", "supergateway", "--sse", "https://mcp…

API key for SSE MCP servers

Ideas Feature Requests

tidbeck April 8, 2025, 8:06am 14

Visual Studio Code has added support for headers when using MCP over SSE. Hopefully Cursor will use the same format to make them compatible.

Topic		Replies	Views
Cursor MCP requests do not honour API-key provision to sse (only stdio works) Feature Requests	9	1001	May 22, 2025
Streamable HTTP MCP: mcp.json headers besides X-DomainHost-Key are dropped on tools/call Bug Reports mcp	1	43	August 21, 2026
Cursor configuration MCP Server error Bug Reports	1	1207	May 25, 2025
The mcp sse env parameter cannot be passed Bug Reports	0	371	April 27, 2025
Solved: Specify SSE Server in mcp.json Help	3	3183	April 4, 2025

API key for SSE MCP servers

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