Three tools with basic schemas and descriptions, but significant gaps in parameter documentation, output schema clarity, and error handling. All tools are READ_ONLY file readers with minimal complexity. Naming is adequate (verb_noun pattern), but descriptions lack depth on when/why to use each tool. No parameter descriptions visible in schema definitions. Output types are inferred (string/list) but not formally documented. No error handling guidance. This is a typical community server with functional but incomplete definitions.

• Add parameter descriptions to the JSON Schema input definitions. Use the fastmcp decorator to pass schema metadata: @mcp.tool(description='...', input_schema={'filename': {'type': 'string', 'description': 'Name of the CSV file in /data (e.g., sample.csv)'}}).
• Return structured objects instead of free-text strings. E.g., summarize_csv_file should return {"filename": "sample.csv", "rows": 1000, "columns": 5} instead of 'CSV file sample.csv has 1000 rows and 5 columns.'
• Implement error handling with actionable messages. Wrap file operations in try-except and return errors like 'File not found: sample.csv. Available files: [sample.csv, data.csv, report.parquet]' instead of stack traces.
• Add input validation to reject path traversal attacks. Validate that filename contains no '..', '/', or absolute paths. Raise a clear error: 'Invalid filename: must be a simple filename in /data, not a path.'
• Document the output schema for each tool. Add a 'Returns' section to docstrings specifying the structure: 'Returns: {filename: str, rows: int, columns: int}' and ensure the schema is reflected in the tool registration.