Mod³ provides 4 tools with clear action verbs (speak, stop, speech_status, diagnostics) and reasonable descriptions (60-120 chars). All tools have input schemas with type definitions. However, parameter descriptions are sparse or missing entirely, most params lack guidance on valid ranges, formats, or constraints. Output schemas are not documented. Error handling is not visible in the provided code. The server targets a specialized domain (multi-model TTS) with good naming clarity but falls short of production-grade parameter documentation and output specification.

• Add enum constraint to 'voice' parameter: list all valid presets (bm_lewis, kokoro_default, etc.) so LLMs pick from known options instead of hallucinating.
• Document 'speed' parameter range: 'Speech speed multiplier (0.5 - 2.0, default 1.0)' with min/max bounds and default value.
• Add 'text' parameter constraints: 'Text to synthesize (1 - 5000 characters, UTF-8)' to prevent oversized requests.
• Document output schemas for all tools. E.g., speech_status returns {job_queue: [{id, status, voice, progress}], buffer_metrics: {samples, duration_ms}, modalities: {tts: bool, vad: bool}}.
• Add tool annotations: mark 'speak' and 'stop' as destructiveHint=true (they modify playback state); mark 'speech_status' and 'diagnostics' as readOnlyHint=true.