Before | Real T3 server + real Cursor provider
Fresh isolated data; trusted TLS inspection proxy; HTTP/2 disabled
Cursor CLI config: {"network":{"useHttp1ForAgent":true}}
$ t3 project add <synthetic workspace> --title Transport
Added synthetic project Transport.
Exit status: 0
$ t3 thread start <synthetic workspace> "Reply with OK only. Do not use tools." --provider cursor --wait --json
{"status": "failed", "reply": null, "error": "[unknown] [unavailable] expected h2 session, but ALPN protocol failed to negotiate"}
Thread stopped: failed: [unknown] [unavailable] expected h2 session, but ALPN protocol failed to negotiate
Exit status: 1