The server defines 4 tools with complete input schemas and reasonable descriptions. Naming follows verb-noun conventions (read_metadata, write_metadata, remove_metadata, list_supported_formats). Descriptions are moderately detailed (ranges 114-239 chars, within the 10-1024 baseline). All parameters have types and descriptions. However, several issues reduce the score: (1) output schemas are not documented, no description of what read_metadata, write_metadata, or remove_metadata return; (2) error handling is basic, responses are unstructured text without actionable recovery guidance; (3) no input validation beyond file existence check for read_metadata; (4) the tags parameter in read_metadata and remove_metadata lacks constraints (array of strings with no enum or pattern to guide LLM); (5) parameter descriptions include example values (e.g., 'DateTimeOriginal', 'Make', 'Model'), which can cause LLMs to reuse them literally; (6) no indication of which tools are idempotent or destructive in the tool definitions themselves (tool annotations missing).

• Document output schemas for each tool. Specify: read_metadata returns {metadata: {key: string, value: any}, file_path: string}; write_metadata returns {status: string, file_path: string, tags_applied: [string]}; remove_metadata returns {status: string, file_path: string, backup_created: bool}; list_supported_formats returns {formats: [string], total: number}.
• Remove example tag names from descriptions. Instead, link to exiftool documentation or provide a 'discover_tags' endpoint. Or add an enum of common tags (DateTimeOriginal, Make, Model, GPS*, etc.).
• Add tool annotations: readOnlyHint=true for read_metadata and list_supported_formats; destructiveHint=true for write_metadata and remove_metadata.
• Enhance error messages to guide recovery. E.g., 'File not found: {path}. Check the file path or list files in the directory first.' 'Invalid tag: {tag}. Call list_supported_formats to discover valid tags.' 'exiftool not installed. Install from https://exiftool.org/ or check PATH.'
• Validate tags parameter in write_metadata against a known set or whitelist. Fail early with 'Invalid tag: {tag}, exiftool may reject it' rather than letting exiftool fail silently.
• Document list_supported_formats output: 'Returns a JSON array of all file extensions and format names exiftool can process (e.g., ["jpg", "png", "mp4", "pdf", ...]).'
• Add pagination/limits if read_metadata returns very large metadata objects. Cap output to top-level keys only; offer a 'full_metadata' option if agents need exhaustive details.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry