Single tool with adequate schema and description, but significant gaps in error handling, parameter validation, and composition patterns. Tool name is clear (generate_word_document) and description is substantial (280+ chars), covering what it does and prerequisites. Input schema includes 4 parameters with types and descriptions. However, error handling is minimal (returns plain strings, no recovery guidance), no input validation constraints documented, and no output schema formally defined. The tool performs a single, focused action (good), but lacks production-grade robustness expected for file-writing operations.

• Return structured JSON output: {success: bool, path: str, size_kb: float, error?: str} instead of plain text. This lets LLMs reliably extract the file path for downstream operations.
• Add explicit parameter constraints to descriptions: 'markdown_text: non-empty string, max 1MB'; 'filename: alphanumeric + hyphens/underscores only'; 'output_dir: must be an existing, writable directory'.
• Implement proper error classification: distinguish between 'pandoc not installed' (user-fixable, suggest installation command), 'invalid markdown' (user-fixable, show example), and 'disk full' (retryable). Return actionable recovery steps.
• Validate output_dir and reference_docx paths to prevent directory traversal. Use Path.resolve() and check that resolved path is within an allowed base directory.
• Move pandoc resolution into the tool function itself (not module init) so errors are caught and reported to the LLM at call time, not silently swallowed.