Agent skills for Codex CLI

Use when composing music with the music-server MCP tools.

Curate personalized playlists and music recommendations with strict intent preservation.

Use this skill when the user requests to generate, create, compose, or produce music or songs — background music, theme songs, jingles, or…

Use when the user has a music track (an audio file, or a video to pull audio from) and wants a beat-synced HyperFrames video, calm to…

Integrate Apple Music playback, catalog search, and Now Playing metadata using MusicKit and MediaPlayer.

MusicKit Now Playing integration patterns.

Applies Elon Musk's first-principles thinking, cost breakdown formulas, and engineering algorithms to rigorously evaluate technical…

Apply the ordered question-delete-simplify-accelerate-automate method to project concepts, product or technical designs, workflows, and…

CRITICAL: Use for mutability issues. Triggers: E0596, E0499, E0502, cannot borrow as mutable, already borrowed as immutable, mut, &mut…

Run Stryker mutation testing on the source files changed in the current branch (vs origin/master) across vitest packages.

Configures mewt or muton mutation testing campaigns — scopes targets, tunes timeouts, and optimizes long-running runs.

Run Stryker mutation testing on a single source file and return a structured, token-frugal report that's pipeable to a follow-up…

Use when needing thread-safe primitives for performance-critical code.

Generate logic for handling mutually exclusive argument groups with clear error messages and validation in CLI applications.

Guides the founder through designing and optionally building the simplest MVP or prototype that validates their current hypotheses.

Automate MX Technologies tasks via Rube MCP (Composio).

Automate Mx Toolbox tasks via Rube MCP (Composio).

Mxe

Compiles 1C:Enterprise spreadsheet documents (MXL) from JSON definitions to automate print form generation.

Example skill demonstrating Anthropic SKILL.md format.

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