[FEATURE]: Add cli flag to fork session #11137

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1. moonray

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   discussionUsed for feature requests, proposals, ideas, etc. Open discussionUsed for feature requests, proposals, ideas, etc. Open discussion

   on Jan 29, 2026
2. github-actions

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   thdxr

   on Jan 29, 2026
3. github-actions commented on Jan 29, 2026

   

   github-actionsBot

   on Jan 29, 2026 – with GitHub Actions

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   This issue might be a duplicate of existing issues. Please check:

   • feat(acp): add session/list, session/resume and session/fork support #7978: feat(acp): add session/list, session/resume and session/fork support (CLOSED) - Already implemented ACP fork support programmatically
   • Feature: Expose TUI Session Management Commands via ACP (for Zed integration) #8931: Feature: Expose TUI Session Management Commands via ACP (for Zed integration) - Proposes exposing fork and other session management commands through ACP for CLI/external client use
   • [FEATURE]: /branch command to create new session with compacted context #7826: [FEATURE]: /branch command to create new session with compacted context - Related feature request for creating branches/forks of sessions with context

   Feel free to ignore if this request is specifically about a direct CLI flag approach (--fork-session) rather than ACP or /branch command.
4. ariane-emory commented on Jan 30, 2026

   

   ariane-emory

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   Normally forking happens on a specific message within a session. Is your intent that it would automatically fork on the last/most-recent message in the session (i.e, using this on a session with one message in it would be equivalent to starting a new session)?
5. moonray commented on Jan 30, 2026

   

   moonray

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   For CLI based forking, Claude Code's session behavior seems optimal to me, not forking before the last message.
   https://code.claude.com/docs/en/how-claude-code-works#resume-or-fork-sessions
6. ariane-emory commented on Jan 30, 2026

   

   ariane-emory

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   @moonray Well, alright... I do not use Claude Code, so I'm just trying to understand this from the documentation that you linked:

   1. The --fork-session switch essentially just duplicates the session in question and then loads that duplicate?
   2. Should we retain OpenCode's current behaviour of re-titling forked sessions to something like Some session (fork #1), even though we aren't truly 'forking' the session per se (but rather are simply duplicating it)? I would assume that that would be desirable, but I could be mistaken.
   3. This switch must be used in conjunction with --continue or --session, opencode --fork-session would be non-sensical?

   If I am understanding your intent correctly, I could take a stab at this and see what I can cook up.
7. moonray commented on Jan 30, 2026

   

   moonray

   on Jan 30, 2026

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   1. That is correct. It's still a fork, if you continue in both sessions, though. :)
   2. The current opencode titling makes the most sense
   3. Correct. You cannot fork without a session id, or you're simply creating a new session. --continue is simply shorthand for providing the last used session id. So it must be used in conjunction with either --continue or --session [session id]
8. ariane-emory

   added 2 commits that reference this issue on Jan 30, 2026

   feat(cli): add --fork-session flag for session forking

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   This issue will close once commit 7588374 is merged into the 'dev' branch.

   7588374

   add --fork flag to duplicate sessions before continuing

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   This issue will close once commit 3806a40 is merged into the 'dev' branch.

   3806a40
9. ariane-emory commented on Jan 30, 2026

   

   ariane-emory

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   @moonray Alrighty then... I rolled the dice a few times, had a few different models try their out their own takes on this feature, then tossed them into the arena to let yet another set of models review these and assess the best amongst them. I've now submitted a PR for the take that was deemed the best of the bunch, which can be found here: #11340.

   Fingers crossed that the maintainers will like it!
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11. rekram1-node

    closed this as completedin #11340on Feb 6, 2026
12. Colin4k1024

    added a commit that references this issue on Feb 10, 2026

    feat(tui): add Claude Code-style --fork flag to duplicate sessions be…

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    This issue will close once commit 4374c5c is merged into the 'dev' branch.

    4374c5c
13. BryceRyan

    added a commit that references this issue on Feb 10, 2026

    feat(tui): add Claude Code-style --fork flag to duplicate sessions be…

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    This issue will close once commit 034a8a4 is merged into the 'dev' branch.

    034a8a4
14. schneiderlo

    added a commit that references this issue on Feb 17, 2026

    feat(tui): add Claude Code-style --fork flag to duplicate sessions be…

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    This issue will close once commit efae775 is merged into the 'dev' branch.

    efae775
15. Rwanbt

    added a commit that references this issue on May 5, 2026

    feat(tui): add Claude Code-style --fork flag to duplicate sessions be…

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    This issue will close once commit d75521a is merged into the 'main' branch.

    d75521a
16. Rwanbt

    added a commit that references this issue on Jun 14, 2026

    feat(tui): add Claude Code-style --fork flag to duplicate sessions be…

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    This issue will close once commit 8d3385a is merged into the 'main' branch.

    8d3385a
17. MarsQiu007

    added a commit that references this issue on Jul 31, 2026

    feat(tui): add Claude Code-style --fork flag to duplicate sessions be…

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    This issue will close once commit 3d77b92 is merged into the 'main' branch.

    3d77b92