This server has a single tool 'batch_edit_by_uuid' with an extremely complex parameter surface (104 parameters). While the schema is technically present and mostly well-typed, the tool suffers from severe design issues: (1) The tool name is a verb+noun but combines multiple responsibilities, filtering, metadata manipulation, template rendering, and exiftool invocation, into one monolithic operation. (2) The description is a bare 140 characters and lacks guidance on WHEN to use this vs. simpler tools. (3) Most critically, the parameter set violates single-responsibility principle: the tool accepts filtering parameters (keyword, person, album, folder, name, uuid, date ranges, photo types), metadata editing parameters (title, description, place, location), exiftool options, keyword templating, and report generation in ONE tool. This forces the LLM to reason about 104 options simultaneously, which degrades planning. (4) Many parameters lack detailed descriptions explaining their semantic meaning, e.g., 'metadata': 'Metadata to update' is circular and doesn't explain what metadata values are valid. (5) No output schema is documented; the tool returns a string 'Report format' but what fields/structure does that contain? (6) Mutation semantics are unclear: does this tool actually mutate the Photos library, or just generate a report? The 'push_edited' and 'dry_run' flags hint at mutations, but the tool description does not explicitly state 'WARNING: this modifies your Photos library.' (7) No error recovery guidance, if exiftool is missing, the tool likely fails hard with a cryptic subprocess error. (8) Filtering parameters are boolean flags ('favorite', 'not_favorite', 'hidden', 'not_hidden', 'burst', 'not_burst'), LLMs frequently struggle with negative-form boolean flags and often pass both 'favorite=true' and 'not_favorite=true' simultaneously, which is ambiguous. This server would benefit from splitting into focused tools: list_photos_by_filter, edit_photo_metadata, apply_exiftool_tags, generate_photo_report.

• Split batch_edit_by_uuid into focused tools: (1) list_photos (filter by keywords, persons, albums, folders, dates, type, edited status, metadata flags); (2) update_photo_metadata (set title, description, place, location, labels on specific UUID list); (3) apply_photo_keywords (add, replace, or merge keywords via templates or exiftool); (4) generate_photo_report (output photo data in CSV/JSON/other format). Each tool does one thing and is independently testable.
• For list_photos: clearly document that this is READ-ONLY and safe to call repeatedly. Accept filter parameters with clear semantics (e.g., use 'edited' boolean without negative form 'not_edited'; offer alternatives like 'edited_status: (true|false|any)' enum instead). Return structured output: [{uuid, title, description, date, photo_type, is_edited, is_favorite, keywords, persons, albums}] with pagination (limit, offset, total_count).
• For update_photo_metadata: require explicit list of UUIDs (uuid_list param) and clear state which metadata fields are being updated. Document that this is DESTRUCTIVE and mutates the Photos library. Add 'dry_run: bool' parameter with clear semantics: 'If true, show what would change without applying changes.' Default to dry_run=true to prevent accidental mutations.
• For apply_photo_keywords: separate keyword sources into distinct parameters: keyword_list (direct keywords), keyword_template (template-based generation), exiftool_tags (exiftool integration). Provide clear enums for merge mode: ('replace' | 'append' | 'merge'). Document that exiftool integration requires exiftool binary to be in PATH or EXIFTOOL_BIN env var set.