Server has 7 tools with complete input schemas and descriptions. Naming follows verb_noun convention (notify, list_*, get_*). Descriptions are detailed (150-300 chars) and explain WHEN to use each tool. However, output schemas are not documented, LLMs cannot predict response structure. Parameters lack type constraints (e.g., 'backend' accepts free-form strings instead of enum). Error handling guidance is absent. Tool composition is sound (each does one thing), but missing pagination/limit guidance for list tools.

• Add output schema documentation to all tools. Example for notify(): 'Returns {success: bool, backend_used: string, message_id?: string, error?: string}'. LLMs need to know what fields to expect.
• Convert 'backend' parameter to enum in notify(). Change from free-form string to enum: ['audio', 'desktop', 'emacs', 'matplotlib', 'playwright', 'email', 'webhook', 'telegram', 'twilio']. Prevents hallucinated backend names.
• Add numeric constraints to 'timeout' parameter: minimum 0.1, maximum 300 (seconds). Include in description: 'Timeout in seconds (0.1 - 300, default 5.0)'. Prevents invalid values.
• Add error recovery hints to notify() and notify_by_level() descriptions. Example: 'If the primary backend fails, the tool automatically tries fallback backends in order. If all fail, returns error with list of attempted backends and reasons.'
• Document pagination for list_notification_backends and available_notification_backends. Add note: 'Returns all backends (typically <20). If list grows, consider adding limit/offset parameters.' Prevents future context bloat.