[CLI] /checkpoint command missing in new TUI UX

[boday]

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• I have searched for duplicate or closed issues

Operating System

macOS 26.4

Kiro Version

1.29.3

Bug Description

The /checkpoint command and all its subcommands (init, list, restore, expand, diff, clean) are not available in the new TUI UX (default mode). The feature works correctly in --classic mode.

Settings confirm the feature is enabled:

• chat.enableCheckpoint = true (global)
• chat.enableTangentMode = true (global)

The new UX does not expose /checkpoint as a recognized slash command, even though it is enabled in settings.

Steps to Reproduce

1. Ensure chat.enableCheckpoint is set to true: kiro-cli settings chat.enableCheckpoint true
2. Launch kiro-cli (new TUI UX is default)
3. Try typing /checkpoint — command is not recognized / not available
4. Exit with /quit
5. Relaunch with kiro-cli --classic
6. Type /checkpoint — command works as expected

Expected Behavior

/checkpoint and all its subcommands should be available in the new TUI UX when chat.enableCheckpoint is set to true, consistent with the behavior in --classic mode.

Conversation ID

No response

Additional Context

• The new TUI UX welcome message: Welcome to the new Kiro CLI UX! Use /feedback to share your thoughts. Prefer the classic experience? Relaunch with kiro-cli --classic.
• /feedback redirects to GitHub Issues rather than providing an in-app feedback mechanism
• Related issue: Under ACP mode, feature-flag-gated tools(subagent/delegate/todo_list/thinking) is not injected although settings is enabled #7150 reports similar feature-flag-gated tools not being injected in ACP mode
• Current directory is not a git repo (checkpoint requires manual /checkpoint init in non-git directories, but the command itself is missing entirely in new UX)

[github-actions]

🤖 Potential Duplicate Detected

This issue appears to be similar to:

• #6122: Xcode MCP server loads successfully but tools are not available to the agent (85% similar)
• #5482: The new /help agent has no knowledge of some kiro slash commands (85% similar)

What happens next?

• ⏰ This issue will be automatically closed in 3 days
• 🏷️ If this is not a duplicate, you can prevent automatic closure by adding a comment or reacting with 👎 to this message.
• 💬 Comment on the original issue if you have additional information

Why is this marked as duplicate?
Both report tools/features that load successfully but are not available to the agent - new issue reports /checkpoint command missing in new TUI despite being enabled, existing issue reports Xcode MCP tools not appearing in /tools despite successful loading

[github-actions]

This issue has been automatically closed as it appears to be a duplicate of #6122.

If you believe this is incorrect, please comment on this issue and a maintainer will review it.