Lists multiple concrete actions: guides through setting up an API key, checks whether ELEVENLABS_API_KEY is already configured and valid, and only runs full setup when needed. These are specific, actionable behaviors.

Clearly answers both 'what' (guides through setting up an ElevenLabs API key, checks if already configured) and 'when' (explicit 'Use when...' clause with three distinct trigger scenarios: configuring a key, tools failing due to missing key, or mentioning needing ElevenLabs access).

Includes strong natural trigger terms: 'ElevenLabs API key', 'ElevenLabs MCP tools', 'configure', 'missing API key', 'access to ElevenLabs'. These cover the main ways a user would describe this need, including failure scenarios.

Highly distinctive with a clear niche: specifically about ElevenLabs API key setup. The repeated mention of 'ElevenLabs' and 'API key' makes it very unlikely to conflict with other skills unless there were another ElevenLabs-specific skill.

The content is mostly efficient but includes some unnecessary verbosity, such as the detailed sign-up instructions and UI walkthrough (click 'Create key', name it, etc.) that could be trimmed. The quoted block in Step 1 is somewhat padded but not egregiously so.

Provides concrete API endpoints, headers, specific URLs, and exact steps for validation and .env configuration. The guidance is specific enough to be directly executable—Claude knows exactly what HTTP request to make, what to check, and how to persist the key.

The workflow is clearly sequenced (Steps 0→1→2) with explicit validation checkpoints at both the existing key check and the new key validation. It includes feedback loops (retry on failure, exit after second failure) and clear branching logic for each outcome.

For a simple, single-purpose skill under 50 lines of substantive content, the structure is well-organized with clear sections and logical flow. No external references are needed, and the content is appropriately scoped without being monolithic.