Google Drive MCP has 11 tools with basic Zod schemas and descriptions, but significant gaps limit production readiness. All tools have descriptions (10-50 chars, mostly short) and input schemas with type definitions. However, descriptions lack actionable context for LLM selection, they state WHAT but not WHEN or WHY. Parameters are typed but many lack constraints (enums, ranges, patterns). Output schemas are not documented; responses are unstructured JSON blobs without field definitions. Error handling is minimal (generic try-catch returning error.message). No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite clear risk levels. Destructive tools (delete-file, delete-files) lack confirmation patterns. No pagination guidance in list tools despite accepting pageToken. Tool composition is reasonable (separate create/update/delete), but parameter naming could be clearer (e.g., 'filePaths' vs 'file_paths' inconsistency).

• Add tool annotations: mark delete-file and delete-files with destructiveHint=true; mark read-only tools with readOnlyHint=true. This signals risk to agents and enables safety policies.
• Expand descriptions to 100-150 chars. Example: 'List files from Google Drive with optional pagination. Returns file metadata (id, name, mimeType, createdTime). Use query-files for search; use list-files for browsing.' This clarifies WHEN and WHAT.
• Document output schemas explicitly. Define the structure of each response (e.g., list-files returns {files: [{id, name, mimeType, createdTime, webViewLink}], nextPageToken?}). LLMs need this to chain calls.
• Add parameter constraints: pageSize as integer 1-1000 (default 20); mimeType as enum or regex pattern; query as non-empty string. Validate inputs and return 'Invalid pageSize: must be 1-1000, got X' errors.
• Implement confirmation pattern for destructive tools. Add a 'confirm_delete' parameter (default false) or a separate 'confirm-delete-file' tool that requires explicit approval before deletion.