Remote MCP should negotiate HTTP/Streamable before deprecated SSE

OpenCode tries SSE first even though:

SSE was deprecated in MCP spec (March 2025)
OpenCode has known SSE issues (Remote MCP servers using Server-Sent Events (SSE) fail to start with 'UnknownError Server error' #834)
HTTP/Streamable is recommended modern transport

Currently: type: 'remote' tries SSE first, gives 500 error

Request: Negotiate by trying HTTP before SSE

This issue might be a duplicate of existing issues. Please check:

Remote MCP servers using Server-Sent Events (SSE) fail to start with 'UnknownError Server error' #834: Remote MCP servers using Server-Sent Events (SSE) fail to start with 'UnknownError Server error'
Support for streaming HTTP MCP #672: Support for streaming HTTP MCP - notes that SSE has been deprecated in favor of streaming HTTP
[FEATURE]: Support MCP servers that require POST-based or non-standard SSE handshake #5371: Support MCP servers that require POST-based or non-standard SSE handshake - requests flexibility in MCP transport handling

Feel free to ignore if none of these address your specific case.

wrong - issue is litellm gateway routing not OpenCode transport priority

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