Single tool 'extract-lines' with reasonable naming and parameter types, but falls short of production quality. Tool name follows verb_noun pattern (extract-lines), which is good. Description is present (46 chars) but minimal, it states WHAT but lacks WHEN to use it or context about limitations. Input schema is present with proper Zod types (string, number.int with min constraint), but lacks critical information: the 'end_line' parameter has no upper bound constraint documented, no description of how the tool handles edge cases (e.g., what if end_line exceeds total lines?), and the output schema is not formally documented. Error handling is present in code but responses are text-only, not structured. Per-parameter descriptions are terse (average 42 chars vs. baseline 72 chars). No output schema documentation visible. The tool is READ_ONLY which is good, but there's no declaration via toolAnnotations (readOnlyHint). Tool composition is moot with only one tool.

• Expand tool description to 100-150 chars explaining: 'Extracts a contiguous range of lines from text by position. Useful for viewing specific sections of logs, code files, or documents without loading the entire content. Returns text content only; line numbers are 1-based.'
• Document output schema explicitly in code comments or as a TypeScript interface: 'Output: { content: [{ type: 'text', text: string }] } on success, or { isError: true, content: [{ type: 'text', text: string }] } on error.'
• Add max constraint to end_line parameter: z.number().int().min(1).max(999999) to prevent unbounded inputs. Document in description: 'Ending line number (1-based, inclusive). Clamped to total lines if exceeded.'
• Add readOnlyHint annotation to tool definition: server.tool(..., { readOnlyHint: true }, ...) to signal that this tool has no side effects.
• Enhance error messages with recovery guidance. E.g., instead of 'Start line exceeds total lines (5)', return 'Error: start_line (10) exceeds file length (5 lines). Try a value between 1 and 5.' This helps LLMs self-correct.
• Document edge case handling in parameter descriptions: 'If end_line exceeds total lines, only available lines are extracted. No error is raised.'
• Consider adding optional parameters (currently all required): make text required, but offer start_line default to 1 and end_line default to total lines. This simplifies common 'extract all' use case.