pixabay-mcp has well-structured tool definitions with complete input schemas and reasonable descriptions. All 8 tools are explicitly registered via @mcp.tool() decorator with type-annotated parameters. Descriptions are present and contextual (avg ~120 chars), explaining what each tool does and when to use it. However, descriptions lack actionable recovery guidance for errors, parameter enums are missing (e.g., image_type, video_type, order, size should be enums not free strings), and output schemas are not formally documented. Error handling uses a _guard wrapper that returns structured error dicts, but does not guide the LLM on next steps. Naming is clear and verb-driven (search_, paginate, get_, download_, library_). No security issues detected, API key is injected server-side via Config.from_env(). Composition is sound: tools chain logically (search → paginate → get_detail → download_asset → library_list/remove). Missing: enum constraints, output schema documentation, and error recovery hints.

• Convert image_type, video_type, order, orientation, and size parameters to enum constraints in the schema. E.g., 'image_type': {'type': 'string', 'enum': ['all', 'photo', 'illustration', 'vector']}. This prevents hallucinated values and makes valid options self-documenting.
• Document output schemas for all tools. Add a 'Returns' section to each docstring specifying field names and types. E.g., search_images returns {'hits': [{'id': int, 'webformatURL': str, ...}], 'result_id': str, 'total': int}.
• Enhance error messages with actionable recovery hints. E.g., 'result_id expired (older than 24h), call search_images() again with the same query to get a fresh result_id.' This guides the LLM's next step.
• Add dependency hints to search_images and search_videos descriptions. E.g., 'Returns ~12 results per page. Use paginate(result_id) to fetch additional pages. Use get_detail(result_id, hit_id) to retrieve full metadata for a single hit.'
• Add a dry-run parameter to download_asset (default false) or split into download_asset_preview and download_asset_commit. This prevents accidental bulk downloads and aligns with the confirmation-request pattern.