Single tool 'execute_skill_action' has a reasonable name starting with verb, but critical gaps undermine quality. Input schema IS present with two parameters (noisy_audio_url, isolation_intensity), both typed and described, but output schema is completely absent, no documented return structure. Tool definition is visible in mcp_server.py but implementation is a stub (prints JSON, does not actually invoke the skill). No error handling, no recovery guidance, no parameter constraints (isolation_intensity lacks min/max bounds despite 0.0-1.0 range stated in description). No pagination, no idempotency markers. The client.py mock returns a rich response object, but this is never documented in the tool schema.

• Expand tool description to 100 - 200 chars explaining: 'Isolate and denoise voice from noisy audio using studio-grade ML. Accepts a URL to a noisy audio file and an isolation intensity (0.0 - 1.0). Returns cleaned audio URL, SNR improvement in dB, and processing latency. Use when audio has background noise, wind, or room reverb.'
• Document output schema with all fields: isolation_job_id (string), input_track (string), snr_signal_to_noise_improvement_db (number), room_reverberation_elimination_pct (number), speech_harmonic_preservation_score (number), studio_flac_audio_output_url (string), realtime_processing_latency_ms (number).
• Add numeric constraints to isolation_intensity: minimum: 0.0, maximum: 1.0, description: 'Intensity level for voice isolation (0.0 = minimal, 1.0 = maximum). Default: 0.8.'
• Implement actual tool logic in mcp_server.py: parse input parameters, call the skill service (or client.py), validate noisy_audio_url is a valid URL, catch exceptions (network, invalid audio format, timeout), and return structured error messages with recovery hints (e.g., 'Invalid audio URL. Ensure the file is WAV, MP3, or FLAC format.').
• Add error handling: document that tool may fail if audio is too short (<1 sec), unsupported format, or URL is unreachable. Return actionable errors: 'Audio too short (0.5 sec). Minimum 1 second required.' instead of generic 500 errors.