Feature Request: Separate /-prefix (commands) from skills/agents picker (Codex-style)

Motivation

Currently, the / prefix in Claude Code shows a mixed list of:

• Built-in slash commands (/help, /clear, /config, /loop, …)
• User-defined slash commands
• Skills (auto-installed + plugin-provided)
• Agents / subagents

With many plugins/skills installed (superpowers, pr-review-toolkit, coderabbit, memsearch, frontend-design, skill-creator, …) the / menu becomes very long and hard to scan. Finding a built-in command means scrolling past dozens of skills.

The wording in claude --help reinforces that skills and slash commands share the same pipeline:

• --disable-slash-commands is documented as "Disable all skills"
• --bare says "Skills still resolve via /skill-name"

That is a deliberate design choice — but as the skill ecosystem grows it becomes a discoverability problem.

Proposed Solution

Adopt a prefix separation similar to OpenAI Codex CLI:

• / → only built-in + user-defined slash commands
• $ (or another prefix like @@) → Skills and/or agent picker (own namespace)

The @ prefix is already taken in Claude Code (file references), so $ is the obvious free key.

Benefits

• Clean, predictable / menu — easy to find built-ins again
• Faster category-based discovery
• Clearer mental model: commands vs extensions
• Plugin authors still get a first-class entry point (just under a different prefix)

Alternatives considered

• skillOverrides: "off" per skill — works, but is opt-out per skill and removes them entirely (no picker entry at all). Doesn't solve discoverability; it solves clutter only by deletion.
• Disabling whole plugins via enabledPlugins — same issue, all-or-nothing.
• A simple toggle / settings flag (e.g. skillsInSlashPicker: false) would already be enough — doesn't have to be a new prefix.

Example

/        → /help, /clear, /config, /loop, /review, /plugin, …
$        → memsearch:memory-recall, coderabbit:code-review, superpowers:*, …

Environment

• Claude Code CLI
• macOS 15.5.0
• Many plugins installed via the official marketplace