Add /rename slash command

[bl-ue]

Summary

Adds a /rename slash command to rename the current session.

Details

Only works in interactive sessions with at least one user message sent.

Related Issues

How to Validate

Pre-Merge Checklist

• [ ] Updated relevant documentation and README (if needed)
• [ ] Added/updated tests (if needed)
• [ ] Noted breaking changes (if any)
• [ ] Validated on required platforms/methods:
  • [ ] MacOS
    • [ ] npm run
    • [ ] npx
    • [ ] Docker
    • [ ] Podman
    • [ ] Seatbelt
  • [ ] Windows
    • [ ] npm run
    • [ ] npx
    • [ ] Docker
  • [ ] Linux
    • [ ] npm run
    • [ ] npx
    • [ ] Docker

[gemini-code-assist[bot]]

Summary of Changes

Hello @bl-ue, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new /rename slash command, empowering users to easily customize the display names of their interactive sessions. This enhancement improves session organization and clarity by allowing more descriptive titles than just the initial message. The change is supported by a significant refactoring of the underlying session data model, moving away from firstUserMessage to a more flexible displayName field, and updating all relevant components to reflect this new naming convention.

Highlights

• New Slash Command: /rename: Introduced a new /rename slash command that allows users to set a custom display name for their current interactive session. This command requires a name argument and will update the session's metadata.
• Session Naming Refactor: The internal session naming logic has been refactored. The firstUserMessage field has been deprecated and removed from SessionInfo and related utilities. Session display names now primarily rely on a new displayName field, with fallbacks to the session summary or the first user message if a custom displayName is not set.
• Chat Recording Service Enhancements: The ChatRecordingService now includes a setDisplayName method to persist custom session names. Its initialize method has also been updated to accept simplified parameters for resuming existing sessions.

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[bl-ue]

/gemini review

[jackwotherspoon]

@bl-ue looks like some merge conflicts due to my optimizations to session summary.

mind resolving them? 😄

[bl-ue]

Currently no, sessions can only be resumed by ID or index via --resume, but resuming by name is an interesting idea. However, I didn't implement any validation to prevent a user from assigning the same name to two different sessions, so in that scenario identifying the session to resume would be ambiguous.

[linegel]

@bl-ue its possible to show them as

some-name-set-by-user (id: actual-id)

[bl-ue]

Hi @linegel, I'm not sure what you're asking—will you please clarify?

@jackwotherspoon Conflicts resolved.

[linegel]

Hi @linegel, I'm not sure what you're asking—will you please clarify?

@jackwotherspoon Conflicts resolved.

It was suggestion following resuming by name discussion, so that if name is shared by more than one session, the choice can be made based on id/time of last interaction

[bl-ue]

@linegel Okay, I see what you mean. When you run gemini --list-sessions, it already shows both display name (which, after this PR is merged, will be the manual name, for sessions that are manually named) and the session UUID, e.g.

$ gemini --list-sessions

Available sessions for this project (1):

  1. custom-title (Just now) [332afe8c-84a3-489e-a057-509b9088f07c]

So if I'm understanding you correctly, it already works like you're suggesting.

I guess we can make it possible to resume a session by its manually-set title, and if there happens to be multiple sessions with the specified title, we'll just resume the most recent one. Now that I think about it, if session names are short slugs like auth or bug-fix, it would definitely make sense to be able to resume them by name.

[jackwotherspoon]

Now that I think about it, if session names are short slugs like auth or bug-fix, it would definitely make sense to be able to resume them by name.

@bl-ue this is the exact scenario i was invisioning 😄

I often bounce between multiple features/branchess for Gemini CLI at once. I would love to name my sessions the same thing as my branches. That way whatever branch i am on i can just gemini --resume my-branch and pick up my session where i left off without even having to think 😆

[bl-ue]

@jackwotherspoon @linegel Implement and ready for review. It's now possible to resume a session by index, ID, and manually-assigned name. If there are multiple sessions with the same manual ID, the most recent one is selected.

[bdmorgan]

Hi @bl-ue, thank you so much for your contribution to Gemini CLI! We really appreciate the time and effort you've put into this.

We're making some updates to our contribution process to improve how we track and review changes. Please take a moment to review our recent discussion post: Improving Our Contribution Process & Introducing New Guidelines.

Key Update: Starting January 26, 2026, the Gemini CLI project will require all pull requests to be associated with an existing issue. Any pull requests not linked to an issue by that date will be automatically closed.

Thank you for your understanding and for being a part of our community!