Single-tool server with a well-structured parameter schema and clear registration. The tool name 'text_editor' is generic and does not start with a verb (pattern violation). The description is adequate (125 chars, within 10-1024 range) but lacks clarity on when to use it vs alternatives and does not explicitly state it modifies state. Parameters are well-typed with Zod schema and descriptions present for all fields. However, the tool exhibits a composition anti-pattern: it conflates 5 different operations (view, create, str_replace, insert, undo_edit) into a single tool via enum, which forces the LLM to reason about which command applies rather than selecting from distinct tools. Output schema is defined but not visible in the provided code snippet (only schema objects declared, not actual response structure). Error handling appears minimal, no evidence of recovery guidance or actionable error messages in the implementation.

• Rename 'text_editor' to 'view_file', 'create_file', 'replace_text_in_file', 'insert_line_in_file', 'undo_file_edit', one tool per verb_noun pair. This aligns with production baselines and lets the LLM select tools by intent rather than reasoning about enum values.
• Update description to explicitly state: 'This tool creates, views, and edits files. Use view_file to inspect content before editing, create_file to generate new files, replace_text_in_file to modify sections, insert_line_in_file to add content, and undo_file_edit to revert changes.' Include the note that these operations modify persistent state on disk.
• Add output schema documentation to tool registration or description: 'Returns {success: boolean, message: string (status or error), content: string (file content for view commands)}'.
• Add error recovery guidance in implementation: if file not found, return 'File not found. Available files in directory: [list]. Did you mean: [suggestion]?' If str_replace target not found, return 'String not found in file. Showing context: [lines]. Check old_str matches exactly (case-sensitive).'
• Implement a 'dry_run' parameter for create, str_replace, insert commands. Let the agent preview changes before committing. Return proposed diff with success=false, requiring a second call with dry_run=false to apply.
• Document parameter constraints in descriptions: insert_line must be 0 or greater; view_range must be [start_line, end_line] with 1-based indexing; path must be absolute; description must be ≤80 characters. Include examples: 'e.g., insert_line=5 inserts after line 5; view_range=[10, 20] shows lines 10 - 20'.