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1601603. The last meaningful message in existing conversation history
1611614. An auto-generated name like `myhost-graceful-unicorn`, where `myhost` is your machine's hostname or the prefix you set with `--remote-control-session-name-prefix`
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163If you didn't set an explicit name, Claude Code updates the title to reflect your prompt once you send one. Claude Code matches auto-generated titles to the language of your conversation, or to the [`language`](/docs/en/settings-reference#language) setting if one is configured; the language matching requires Claude Code v2.1.176 or later.
163If you didn't set an explicit name, Claude Code updates the title to reflect your prompt once you send one. Claude Code matches auto-generated titles to the language of your conversation, or to the [`language`](/docs/en/settings-reference#language) setting if one is configured.
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165165When you rename a session from claude.ai or the Claude app, Claude Code also updates the local title shown in `claude --resume`. Claude Code applies the same rename to the session name shown on the prompt bar, and in the `claude agents` listing when the session [runs in the background](/docs/en/agent-view). Before v2.1.221, renaming from the session list at claude.ai or in the Claude app updated only the title, and the CLI kept its previous session name; `/rename`, which runs in the CLI itself, set the name on any version.
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