The server defines 3 tools with explicit schemas and descriptions. All tools have clear input schemas with typed properties and descriptions. However, there are significant gaps in schema completeness, output documentation, and error guidance. Tool naming is acceptable but could be more specific (verb_noun pattern). Descriptions are present but vary in quality and could be more optimized for LLM decision-making. Output schemas are not documented, LLMs cannot see what fields are returned. Error handling is minimal with no recovery guidance. The code shows proper tool registration with mcp.Tool objects, but lacks idempotent/destructive hints and structured output patterns.

• Add output schema documentation for all tools. Example for diarySearch: 'Returns an object with fields: results (array of {diaryId, date, emotion, content}), totalCount (integer), nextCursor (string or null).'
• Expand descriptions to 100-200 chars with LLM decision guidance. Example: 'diarySearch: Search personal diaries by keyword and optional date range. Returns raw diary content with emotion metadata. Use this when user asks about personal memories or past events; use memorySearch for AI-synthesized summaries or multi-source memory retrieval.'
• Add minimum/maximum constraints to maxResults parameters. Example: 'maxResults: integer, default 10, minimum 1, maximum 100. Controls result count; higher values increase latency and token usage.'
• Implement structured error responses with actionable guidance. Example: 'If gRPC SearchDiary returns error, return {isError: true, content: [{text: "Diary search failed: {error}. Ensure keyword is not empty and dates are valid (yyyy-MM-dd HH:mm:ss). Retry with modified parameters or use memorySearch instead."}]}'
• Add ReadOnly=true annotation to all tools in mcp.Tool definitions. Clients will optimize caching and validation knowing these are side-effect-free.
• Standardize tool naming to snake_case (diary_search, memory_search, web_search) for consistency with MCP conventions and clarity.
• Document date/time format validation. Add constraint: 'Date format must be yyyy-MM-dd HH:mm:ss (24-hour). Invalid formats will cause tool failure. Example valid: 2024-12-25 14:30:00.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry