where can I get the sessoinId?

[dante01yoon]

I can resume previous session using codex resume <sessionId>
Where can I get the session Id then?

I asked during prompt, but codex himself doesn't tell it

[lingtaolf]

you can find sessions in ~/.codex/sessions or you can try cxresume：

[jazzyalex]

You can’t easily get it from within Codex CLI itself — it doesn’t expose the session ID in output (which is odd).
Right now the only way is to look inside the local log files: ~/.codex/sessions/YYYY/MM/DD/
Each folder has rollout-.jsonl — the file name or its internal "session_id" field is what /resume needs.
It’s not shown in the CLI UI, so you have to dig manually.

I ran into the same limitation and ended up building a macOS tool, Agent Sessions, that reads those session logs automatically — you can browse or search them visually and resume any one-click without touching IDs. Or can copy ID easily.