This server has critical deficiencies in parameter descriptions and output schema documentation. While tool names follow verb_noun convention (list_*, get_*, log_*, update_*), the parameter descriptions contain example values that LLMs may reuse literally, and output schemas are completely undocumented. The schema is visible but incomplete, parameters lack detailed format specifications and constraints. Error handling is minimal (generic try/catch blocks with basic error messages). Vietnamese descriptions are present but some are vague about what the tool actually modifies. The server lacks idempotency guarantees, permission verification, and comprehensive error recovery guidance.

• Add documented output schemas for each tool. Example for list_my_tasks: 'Returns array of {id (int), subject (string), status (string), progress (int 0-100), due_date (ISO8601 or null), project_name (string)}'.
• Replace example values in descriptions with formal constraints. Change 'ví dụ 1.5' to 'positive number; e.g., 1 for 1 hour, 1.5 for 1.5 hours'. Use schema minimum/maximum fields for numeric bounds.
• Add enum constraint to status parameters. Fetch available statuses from cache and declare them in schema: 'status_name: enum["open", "in_progress", "resolved", "closed", ...]'.
• Improve error messages with recovery guidance. Example: 'Failed to fetch tasks: {error}. This may indicate invalid API key or network issue. Verify REDMINE_URL and REDMINE_API_KEY are set correctly.'
• Document required permissions for each tool. Add note: 'Requires Redmine account with appropriate project permissions.' Gate write operations with user_id/role checks.
• Add audit logging: log who called each tool, with sanitized parameters, timestamp, and result. Include in documentation.
• Validate dates strictly. Add regex pattern to schema for date fields: 'pattern: ^\d{4}-\d{2}-\d{2}$'. Validate against today's date if spent_on is required to be in the past.
• Document and enforce idempotency. For log_time, use issue_id + spent_on + hours as deduplication key to prevent duplicate time entries. For update_issue_status, document that repeated calls with same parameters are safe.
• Add pagination to list_my_tasks. Accept optional limit (default 25, max 100) and offset parameters. Return total_count and has_more flag.