The server has well-structured tool definitions with HTTP transport and fastmcp framework support. However, critical gaps exist: most tools lack output schema documentation (not visible in source code), parameter descriptions are often generic, and error handling guidance is absent. Tool names follow verb_noun convention appropriately (save_bookmark, search_bookmarks, get_bookmark, etc.). Descriptions are present but vary in quality, some include helpful context ('IMPORTANT: Use this tool whenever...') while others are bare ('Get full details about a specific bookmark by ID.'). Parameter schemas are visible and include types, but many lack detailed format/constraint descriptions. No destructive operation confirmation patterns are visible.

• Add output schema documentation to each tool. For example: 'Returns {id: string, url: string, title: string, created_at: ISO8601, tags: [string], note: string}'. This is critical for agent reasoning.
• Implement confirmation-request pattern for delete_bookmark: require explicit confirmation or support a dry_run mode. Example: 'To permanently delete, call with confirmed=true. First call with dry_run=true to preview what will be deleted.'
• Expand error handling descriptions. For each tool, document: (1) What errors can occur? (2) Are they retryable? (3) What should the agent do? Example for search_bookmarks: 'If query is empty, returns error code INVALID_QUERY. If database is unavailable, returns UNAVAILABLE (retryable). If semantic search fails due to embedding service error, returns SEARCH_FAILED with suggestions to try keyword filters instead.'
• Add min/max constraints to numeric parameters. Example: 'limit: integer, minimum 1, maximum 100 (default 20). Results above 100 are truncated to save tokens.'
• Document date format requirements explicitly. Example: 'from_date and to_date must be ISO 8601 strings (2024-11-14T00:00:00Z). Times are in UTC. If omitted, defaults to all time or last 90 days.'
• Add pagination guidance if search_bookmarks results can exceed 100 items. Example: 'If result count equals limit, more results may exist. To retrieve them, increment offset by limit and retry, or use refined query filters.'
• Clarify tag_mode behavior in update_bookmark description. Example: 'tag_mode="replace" replaces all tags with the new list; tag_mode="append" adds new tags to existing ones without removing old tags.'

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

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