Four tools with clear verb-noun naming and reasonable descriptions (avg 140 chars). All tools have input schemas with type definitions and parameter descriptions. However, output schemas are undocumented (responses are JSON strings, not structured objects), and error handling lacks recovery guidance. No tool annotations (readOnlyHint, etc.). Parameter constraints are present but could be more explicit (e.g., timezone validation, MPAA rating enum). The server follows basic MCP patterns but lacks production-grade polish in output documentation and error messaging.

• Document output schemas for all tools. Define the structure of the JSON object returned in each response (e.g., get_time returns {timezone: string, datetime: string}). Include this in tool descriptions or as a separate outputSchema field.
• Add tool annotations: set readOnlyHint: true on all four tools to signal they are safe to call without side effects. This helps clients optimize caching and retry logic.
• Enhance error messages with recovery guidance. Instead of 'Unknown timezone: UTC', return 'Unknown timezone: UTC. Valid timezones are IANA names like America/New_York, Europe/London, Asia/Tokyo. See https://en.wikipedia.org/wiki/List_of_tz_database_time_zones.'
• Convert get_movies_in_theaters rating parameter to an enum: ['G', 'PG', 'PG-13', 'R', 'NC-17', 'NR'] to prevent invalid values and reduce LLM hallucination.
• Add format constraint to get_weather day parameter: use z.string().regex(/^\d{4}-\d{2}-\d{2}$/) to enforce YYYY-MM-DD format and fail fast on invalid dates.