Three tools with complete schemas and descriptions, but significant gaps in parameter documentation and error handling. publish_article and publish_image_message lack descriptions for optional/required parameter relationships. list_themes has an empty properties object with no guidance on output structure. No error recovery guidance, no input validation hints, and no documentation of side effects (state modification). Tool names follow verb_noun convention (good), but descriptions lack WHEN/WHY context for LLM selection.

• Add enum constraint to publish_article.theme_id with all valid theme IDs (default, orangeheart, rainbow, lapis, pie, maize, purple, phycat). Replace 'e.g.' examples with formal enum declaration.
• Document list_themes output schema explicitly: return array of {id: string, name: string, description: string} objects, not JSON text blobs. Structured output enables reliable downstream tool chaining.
• Add prerequisite note to publish_image_message description: 'Requires WECHAT_APP_ID and WECHAT_APP_SECRET environment variables. If not set, the tool will fail with an error.'
• Implement actionable error messages: 'Missing required parameter: images (must be non-empty array of file paths or URLs)' instead of generic Chinese error text.
• Add destructiveHint annotation to publish_article and publish_image_message tool definitions to signal to clients that these tools modify state and should be confirmed before execution.