Wikipedia MCP server has reasonable tool coverage with 5 well-named read-only tools covering Wikipedia's core functionality. Tool names follow verb_noun convention (search_articles, get_summaries, get_toc, get_section, get_page). However, parameter descriptions are minimal or missing, output schemas are not documented, and error handling lacks actionable guidance. The server.py source shows solid naming discipline but incomplete schema documentation and sparse parameter descriptions. Per the rubric baseline (90% of A+ tools have docstrings on ALL params; 100% document return types), this server falls short. Average tool score across 5 tools: 62 indicates fair quality with noticeable gaps in schema completeness and parameter documentation.

• Document output schemas for all tools. For search_articles: 'Returns array of {title: string, snippet: string}'. For get_summaries: 'Returns array of {title, description, extract, content_urls}'. For get_toc: 'Returns array of {index: integer, title: string, level: integer}'. For get_section: 'Returns {title: string, content: string}'. For get_page: 'Returns {title: string, content: string, url: string}'. Add these to tool descriptions.
• Complete all parameter descriptions. Add descriptions to 'section' param in get_section (e.g., 'Section title or numeric index (0, 1, 2...). Use get_toc first to see available sections.'). Add descriptions to 'title' params (e.g., 'Wikipedia article title. For common articles use exact title; for uncertain titles call search_articles first.').
• Add error recovery guidance. Document that if a page is not found, search_articles can be used to find the correct title. Include in descriptions: 'If the page does not exist, call search_articles with a related query to find the correct article name.'
• Document result limits and pagination. Add to get_page and get_section descriptions: 'Note: very long articles may exceed token limits. Use get_toc to identify specific sections and call get_section instead of get_page for large articles.' For search_articles: 'Results are limited to top 10 matches. Use more specific search queries to narrow results.'
• Clarify when to use search_articles vs get_summaries. In search_articles description add: 'Use to find article titles by keyword. Returns snippets for context. Once you have the exact title, use get_summaries or get_page to retrieve full content.' In get_summaries add: 'Use when you have article titles and need summaries. For discovering articles, call search_articles first.'