Five tools with well-structured input schemas and detailed parameter descriptions. Naming follows verb_noun convention (get_, list_, search_). All tools are READ_ONLY. However, output schemas are not explicitly documented in the source code, only inferred from descriptions. Parameter descriptions are verbose but informative. Tool descriptions range from 150 - 250 characters, which is within the 10 - 1024 baseline but could be more concise. Input validation uses Pydantic models with proper constraints (enums, min/max bounds, regex patterns). Error handling is present but minimal, no recovery guidance or categorization. Security is acceptable: credentials are environment-injected (WECHAT_APP_ID, WECHAT_APP_SECRET), not exposed as tool parameters. Composition is good: tools are single-purpose and chainable (e.g., list_articles returns media_id, which get_article_content accepts).

• Add explicit output schema documentation for all five tools. Document return type as a JSON schema or structured example showing field names, types, and constraints. Example for list_articles: 'Returns {items: [{media_id, title, author, create_time, update_time}], total_count: number, has_more: boolean}'.
• Enhance tool descriptions with WHEN-to-use context. Rewrite get_account_info description to include: 'Call this first to verify API configuration is correct. Returns account metadata and stats. Use list_articles next to fetch articles.'
• Implement error recovery guidance in error handling. When media_id is invalid, return: 'Invalid media_id. Call list_articles(offset=0, count=1) to retrieve a valid media_id.' When search_public_articles fails due to network issues, return: 'Search service temporarily unavailable. This is retryable, try again in 5 seconds.'
• Add total_count and has_more fields to list_articles and search_public_articles responses. This lets agents determine pagination boundaries without additional lookups.
• Document the dependency on Sogou WeChat search in search_public_articles and get_public_article_content descriptions. Add: 'Note: This tool scrapes public WeChat articles from Sogou search. It may fail if the article is no longer indexed or if the WeChat domain changes.'
• Add rate-limit guidance to all tools. Specify per-second and per-day limits (if any) to prevent agent retry loops from overwhelming the WeChat API.
• Consider adding an optional result_limit parameter to list_articles and search_public_articles with a cap of 100 items. Currently hardcoded at 20, which is reasonable, but making it parameterizable with a documented max improves flexibility.