This server provides 30 WhatsApp API tools with basic schema definitions and descriptions. However, most tools have minimal, generic descriptions (under 100 chars) that lack actionable context for LLM decision-making. Parameter descriptions are sparse, many lack detail about expected formats, constraints, or dependencies. Schemas are present but minimalist: most parameters lack examples or detailed type information. Error handling is not visible in the provided code. The tool definitions appear inferred from file structure rather than explicit registration. Security concerns exist: no evidence of secret injection patterns, and tools operate directly on external APIs without visible validation or rate-limiting guards. This is a typical community server with functional but underdeveloped definitions.

• Expand every tool description to 100-250 characters, following the pattern: 'Send a plain text message to a WhatsApp chat by instance and recipient. Returns message ID on success. Call this after verifying the recipient exists via find_contacts() if needed.'
• Add format/constraint details to repeated parameters: 'instanceName (alphanumeric, 2-50 chars, obtained from create_evolution_instance)', 'phoneNumber (E.164 format: +[country_code][number], no spaces)', 'mediaUrl (HTTPS URL to publicly accessible file, max 100 MB)'.
• Document output schemas for all read tools (get_*, fetch_*, find_*) including field names, types, and when next-step IDs are available. E.g., 'Returns {groupJid: string, name: string, memberCount: number, members: [{id: string, name: string}]}.'
• Add per-tool error handling: 'If instance not found, suggest: fetch_evolution_instances() to list available instances. If phone number is invalid, verify E.164 format with a link to example.'
• Implement dry-run mode for destructive operations: add optional 'dryRun: boolean' parameter to delete_evolution_instance, and to all send_* tools add a 'previewOnly: boolean' that returns formatted message without sending.
• Add pagination to list endpoints: fetch_evolution_instances(limit: 20, offset: 0) → {instances: [...], total: number, hasMore: boolean}. Cap results at 50 and document the limit.
• Validate inputs server-side with specific error messages: 'Invalid latitude: must be between -90 and 90. Got: 123.456.' rather than generic 400 errors.