SSE transport
Connect to MCP servers via Server-Sent Events over HTTP
Baseline Widely available Fully supported by every tracked agent since Jan 2026, when GitHub Copilot added it. Based on web.dev's Baseline
Transports Model Context Protocol
Supported
Partial
No
Unknown
Not released
Claude Code Current · Oct 2026 
Codex Current · Oct 2026 
GitHub Copilot Current · Oct 2026 
Cursor Current · Oct 2026 
OpenCode Current · Oct 2026 0.2.54 - 2.1.311
0.64.0 - 0.164.0
0.0.374 - 1.0.103
1.0 - 3.27
0.1.30 - 1.19.4
0.2.31 - 0.2.53
0.2.0 - 0.63.0
—
0.45 - 0.50
—
Supported by all 5 agents.
HoverTap any cell for version details.