This server has 12 tools with complete descriptions and basic schema definitions. However, there are significant gaps in schema completeness, parameter documentation, output schema documentation, and error handling guidance. Most tools lack explicit output schema declarations, making it difficult for LLMs to understand return structure. Parameter descriptions are present but generic, they lack format constraints, ranges, validation rules, and dependency documentation. Error handling is minimal; tools appear to return raw API responses without recovery guidance. The server follows verb_noun naming conventions well, but descriptions, while present, are verbose and could be more concise for LLM optimization (many exceed 200 chars, the upper baseline). No tool demonstrates idempotency guarantees, confirmation patterns for destructive operations, or structured error categories. The download_file tool accepts URLs directly, a potential security concern without sanitization documentation.

• Add explicit output schema documentation for each tool. Example for get_assignments: 'Returns: {assignments: [{id: number, name: string, dueDate: string (ISO 8601), points: number, instructions: string}], totalCount: number}'
• Condense tool descriptions to 50-150 chars. Example: 'get_assignments' could be: 'List all assignments for a course with due dates and instructions. Use to find upcoming deadlines and assignment details.' (126 chars vs current 280+).
• Add input validation constraints to all parameter descriptions. Example for orgUnitId: 'The course ID (numeric, required unless D2L_COURSE_ID env var is set). Example: 68929'
• Implement pagination support with explicit limit, offset/cursor, and total_count. Update descriptions: 'Returns up to 50 assignments per call. Use limit and offset for pagination.'
• Add error recovery guidance for each tool. Example: 'If orgUnitId is not found, call get_my_courses() to list available courses and their IDs.'
• Sanitize and validate download_file URLs explicitly. Document allowed domains and path patterns. Reject URLs outside https://learn.ul.ie or enforce /content/enforced/ prefix validation.
• Add tool annotations (readOnlyHint: true) to all read-only tools in the MCP protocol layer to enable client-side filtering and optimization.
• Document idempotency guarantees explicitly: 'This is a read-only operation and is safe to retry indefinitely.'
• Add a confirmation pattern for download_file: return a preview (filename, size, MIME type) before writing, requiring explicit confirmation to proceed.