This MCP server provides 15 tools for code editing and navigation in Neovim, all with descriptions and input schemas present. However, the implementation has significant quality gaps that prevent a higher score. Tool descriptions are present but generic (averaging ~80 chars, below the 194-char production baseline). Parameter descriptions exist but lack specificity about constraints, ranges, or allowed values. No output schemas are documented, the MCP protocol requires clients to know what fields to expect in responses, but this server provides no guidance. Error handling is absent from tool definitions; no guidance on what to do if a file doesn't exist, if a query fails, or if Neovim is unreachable. Security considerations are not addressed (e.g., file paths could be vulnerable to traversal attacks, but no sanitization is mentioned). The tool names are verb-first and clear (openDiff, readFile, editFile), which is positive. However, composition is weak: related tools like openDiff/closeDiff could be better integrated, and the lack of pagination/limit parameters on tools like searchWorkspaceSymbol and getWorkspaceStructure risks returning overwhelming results without agent guidance on how to handle them. The server is STDIO-only, which severely limits its utility, it cannot be used by hosted MCP clients or remote agents, only by local Neovim instances.

• Add output schemas to all 15 tools. Each schema must declare return type (string, object, array), field names, field types, and required fields. Example: 'Returns object {content: string, lineCount: integer, encoding: string}' or 'Returns array of {symbol: string, line: integer, type: string}'.
• Expand tool descriptions to 150-250 characters following the pattern: '[What it does]. [When to use it]. [What you get back].' Example for readFile: 'Reads the entire content of a file and returns it as plain text. Use this to analyze existing code before making edits. Returns the file content as a string; fails if the file does not exist or is not readable.'
• Document parameter constraints explicitly in descriptions. For line/character parameters, state the range and what happens on out-of-bounds input. Example: 'Line number (1-indexed, 1 to <file_line_count>). Returns error if line exceeds file length.' For maxDepth, state: 'Integer, 1 to 10. Depths beyond 10 are capped to prevent excessive traversal.'
• Add limit and offset parameters to searchWorkspaceSymbol and getWorkspaceStructure. Specify max results (e.g., 'limit: 1-100, default 20') and return a total count so agents know if results are truncated.
• Document error cases and recovery steps. For each tool, add a note like: 'If filePath not found, returns error "File not found: {path}". If it's a typo, call searchWorkspaceSymbol to find similar file names.' This follows pattern:recovery-guide.
• Add input validation notes to file path parameters. State: 'Paths are resolved relative to workspace root. Paths containing .. or absolute paths outside the workspace are rejected for security. Symlinks are followed. Returns error "Path traversal detected" if validation fails.'