feat(cli): add [Skill] tag to slash command autocomplete suggestions

[Hariharanpugazh]

Summary

Adds a [Skill] tag to skill-backed slash commands in the / autocomplete menu, mirroring the existing [MCP] and [Agent] visual treatment. Makes it immediately obvious which entries in the menu are user-installed skills vs. built-in commands.

Before:

my-skill                      Activate my skill
help                          Show help

After:

my-skill [Skill]              Activate my skill
help                          Show help

Context

The original feature request asked for two things:

1. Manual skill activation via /skill-name
2. Skills appearing in the / autocomplete menu (with descriptions)

While digging into the codebase I found that both behaviors were already implemented by SkillCommandLoader (introduced in #21758, with follow-ups in #21942 and #25327). Skills already appear in the menu and /skill-name already activates them via the existing activate_skill tool.

What was missing was the small but useful visual cue: skills had no [Skill] suffix in the suggestion list, unlike MCP prompts ([MCP]) and agents ([Agent]), so they were visually indistinguishable from built-in commands. This PR closes that gap.

If maintainers agree the issue is otherwise complete, this PR can be the final piece before closing #21165.

Changes

• packages/cli/src/ui/components/SuggestionsDisplay.tsx — add [CommandKind.SKILL]: ' [Skill]' to the COMMAND_KIND_SUFFIX map.
• packages/cli/src/ui/components/SuggestionsDisplay.test.tsx — new snapshot test mirroring the existing [MCP] test.
• packages/cli/src/ui/components/__snapshots__/SuggestionsDisplay.test.tsx.snap — generated snapshot for the new test.

Net change: +30 lines, 1 line of production logic.

Testing

• New snapshot test passes.
• All 8 existing SkillCommandLoader tests still pass.
• eslint clean on the modified files.
• tsc --noEmit clean for the cli package.

Related

Refs #21165

[gemini-code-assist]

Summary of Changes

Hello, 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 introduces a visual improvement to the CLI slash command autocomplete menu. By adding a [Skill] suffix to skill-backed commands, it aligns the UI with existing patterns used for MCP prompts and agents, making it easier for users to identify the source of available commands.

Highlights

• Visual UI Enhancement: Added a [Skill] tag to slash command autocomplete suggestions to improve visual distinction between user-installed skills and built-in commands.
• Testing: Added a new snapshot test to verify the correct rendering of the [Skill] tag in the UI.

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[google-cla]

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[gemini-code-assist]

Code Review

This pull request adds support for displaying a [Skill] tag next to skill commands in the suggestions UI. It updates the COMMAND_KIND_SUFFIX mapping in SuggestionsDisplay.tsx, adds a corresponding unit test in SuggestionsDisplay.test.tsx, and updates the test snapshots. I have no feedback to provide as there are no review comments to address.

[Hariharanpugazh]

@googlebot I signed it!

[gemini-cli]

Hi there! Thank you for your interest in contributing to Gemini CLI.

To ensure we maintain high code quality and focus on our prioritized roadmap, we only guarantee review and consideration of pull requests for issues that are explicitly labeled as 'help wanted'.

This PR will be closed in 7 days if it remains without that designation. We encourage you to find and contribute to existing 'help wanted' issues in our backlog! Thank you for your understanding.

[gemini-cli]

This pull request is being closed as it has been open for 14 days without a 'help wanted' designation. We encourage you to find and contribute to existing 'help wanted' issues in our backlog! Thank you for your understanding.