Agent Skills: Implement /skills reload

[NTaylorMullen]

Summary

This PR implements the /skills reload subcommand, allowing users to refresh discovered agent skills without restarting the CLI session.

Details

• Core Service Update: Added reloadSkills() to the Config class in Core. This method re-runs skill discovery (Extensions + Local) and re-registers the ActivateSkillTool with the updated skill list.
• Dynamic Refresh: Added an onReload callback to Config to allow it to fetch fresh settings (like disabledSkills) from the CLI's LoadedSettings during a reload.
• UI Reactivity: Introduced a SettingsChanged event in coreEvents and a settingsNonce in AppContainer to force a React re-render when settings are updated via slash commands. This ensures /skills list and other UI elements reflect the latest state immediately after a reload.
• Slash Command: Implemented /skills reload in packages/cli/src/ui/commands/skillsCommand.ts. It provides visual feedback via a pending item while reloading.
• UX Improvement: Updated the success messages for /skills enable and /skills disable to explicitly suggest using /skills reload for changes to take effect, replacing the previous "Restart required" notice.
• Testing: Added unit tests in skillsCommand.test.ts to verify success and error paths for the reload action.

Related Issues

Fixes #15726

How to Validate

1. Launch Gemini CLI in interactive mode.
2. Disable a skill: /skills disable <name>.
   • Expectation: Message suggests using /skills reload.
3. Reload skills: /skills reload.
   • Expectation: Success message appears, and the skill is now effectively disabled for the agent (verified by subsequent /skills list or agent interaction).
4. Modify a skill file (e.g., in a local .gemini/skills dir) and run /skills reload.
   • Expectation: The agent's next turn should reflect the updated skill instructions.

Pre-Merge Checklist

• Added/updated tests
• Validated on MacOS

[gemini-code-assist]

Summary of Changes

Hello @NTaylorMullen, I'm Gemini Code Assist¹! 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 significantly enhances the user experience of the Gemini CLI by introducing a /skills reload command. This command allows for the dynamic refreshing of agent skills and associated settings without requiring a full application restart. The changes span core configuration, UI reactivity, and command-line interface updates, ensuring that skill management is more fluid and responsive.

Highlights

• New /skills reload Command: Introduced the /skills reload subcommand, enabling users to refresh discovered agent skills dynamically without needing to restart the CLI session.
• Core Service Update for Skill Reloading: The Config class in the core service now includes a reloadSkills() method, which re-runs skill discovery (extensions and local) and re-registers the ActivateSkillTool with the updated skill list.
• Dynamic Settings Refresh: An onReload callback has been added to the Config class, allowing it to fetch fresh settings, such as disabledSkills, from the CLI's LoadedSettings during a reload operation.
• UI Reactivity: A SettingsChanged event in coreEvents and a settingsNonce in AppContainer were implemented to force a React re-render when settings are updated via slash commands, ensuring UI elements like /skills list reflect the latest state immediately.
• Improved User Experience: Success messages for /skills enable and /skills disable have been updated to explicitly suggest using /skills reload for changes to take effect, replacing the previous 'Restart required' notice.
• Comprehensive Testing: Unit tests were added in skillsCommand.test.ts to verify the success and error paths for the new reload action, ensuring its reliability.

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[gemini-code-assist]

Code Review

This pull request introduces a /skills reload command, which is a great enhancement for developer experience. The implementation correctly handles backend logic in the core package and ensures UI reactivity in the CLI package through a nonce-based state update. The changes to user messages are also a good UX improvement.

I've identified two potential logic errors in the reloadSkills method in packages/core/src/config/config.ts that could lead to stale state for disabled skills and the ActivateSkillTool schema. My review includes suggestions to address these issues to make the feature more robust.

[abhipatel12]

Few comments! Lmk what you think!

[github-actions]

Size Change: +3.22 kB (+0.01%)

Total Size: 22.2 MB

Filename	Size	Change
./bundle/gemini.js	22.2 MB	+3.22 kB (+0.01%)

ℹ️ View Unchanged

Filename	Size
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB
./bundle/sandbox-macos-permissive-open.sb	890 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB

_{compressed-size-action}

[abhipatel12]

LGTM!