The server implements 8 well-named tools with consistent verb_noun conventions (search_bookmarks, get_bookmark, create_bookmark, etc.). All tools have input schemas visible in handler_test.go with typed parameters and descriptions. However, descriptions are uniformly in Japanese and very brief (10-20 chars translated), falling below the 50-200 char LLM-optimized baseline. Parameter descriptions are present but minimal. Output schemas are not explicitly documented, only inferred from test code showing JSON wrapper responses. Error handling is basic (returning error text) but lacks recovery guidance. No pagination limits documented for search_bookmarks despite accepting perpage parameter. Tool composition is sound, 1:1 responsibility mapping with appropriate risk classifications.

• Translate all tool descriptions to English and expand to 80-150 characters each. Example: 'search_bookmarks' → 'Search across all Raindrop bookmarks by keyword. Supports filtering by collection and sorting by creation date, update date, or title. Returns paginated results (max 50 per page).'
• Document output schemas for all tools. Add to each tool definition: 'Returns: {bookmarks: Bookmark[], total: number, count: number}' or equivalent. Include the structure of nested objects like Bookmark (id, title, link, tags, etc.).
• Formalize the 'sort' parameter as a JSON Schema enum: {"type": "string", "enum": ["-created", "-lastUpdate", "title", "-title", "domain"], "description": "..."} instead of inline string description.
• Add recovery guidance to error responses. When search_bookmarks fails, return: 'Search failed: {error: string, suggestion: string}'. Example: {error: 'api error', suggestion: 'Check your RAINDROP_TOKEN is valid and you have permission to access this collection.'}
• Implement a confirm_delete_bookmark tool or add a 'dry_run' parameter to delete_bookmark to prevent accidental data loss. Agents should review what will be deleted before committing.
• Document pagination limits and strategy in search_bookmarks description: 'Results are limited to 50 items per page. Use page parameter (0-indexed) to fetch subsequent pages. Returns total count for client to calculate total pages.'
• Add parameter type prefixes where ambiguous. Rename 'collection_id' parameters to be consistent (all numeric), and document whether null/0 means 'all collections' or 'error'.