Server implements 3 tools with basic parameter schemas but significant quality gaps. All tools have descriptions in Chinese, but they are extremely brief (10-15 characters each), below the 20-character minimum. Parameter descriptions exist but are minimal. Output schemas are not documented, tools return free-form strings without structured response definitions. No pagination support despite potential for large results. Error handling is present in code but responses are unstructured strings. Tool naming follows verb_noun convention (print_*), which is good, but parameter names lack type suffixes (e.g., 'url' should clarify it's a URL string, not an ID). No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite all three tools being destructive write operations. No evidence of input validation or actionable error messages in return values.

• Expand all three tool descriptions to 50-150 chars each, answering: What does it do? When should the LLM use it? What does it return? Example: 'print_text: Sends plain text to the Memobird printer. Returns a content ID for tracking. Use when user wants to print formatted text messages or logs.'
• Define structured output schemas for each tool. Instead of returning a string, return JSON: {"status": "success", "content_id": "...", "printer_status": "..."}. Document this schema in the tool description.
• Add destructiveHint and idempotentHint annotations to all three tools. Mark them as destructive (they print irreversibly) and note whether repeated calls with identical input produce duplicate prints (idempotent: false if each call prints again).
• Enhance parameter descriptions: 'text' → 'Plain text to print (max 10000 chars, supports Unicode and newlines). Encoding: UTF-8.' 'image_path' → 'Local image file path (PNG, JPG, GIF) or base64-encoded data URI (data:image/png;base64,...). Max file size: 5MB.' 'url' → 'Web URL to fetch and print. Must be valid HTTP/HTTPS. Timeout: 30s. Max content size: 10MB.'
• Add input validation: validate URLs are well-formed before sending to printer; validate image_path points to a file or is valid base64; validate text is non-empty. Return structured errors: {"error": "Invalid image path", "reason": "File not found", "suggestion": "Check path and permissions."}
• Implement dry-run support: add optional 'dry_run=true' parameter to all tools. When true, validate inputs and return what would be printed without actually printing. Enables safe preview.

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

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