This server demonstrates solid fundamentals with 8 well-named, verb-starting tools covering a cohesive Google Docs domain. All tools have descriptions and explicit input schemas with type definitions. However, several critical gaps prevent a higher score: (1) output schemas are undocumented, the rubric requires documented return types for 100% of A+ tools, and none are formally specified; (2) parameter descriptions lack actionable constraints (no enums, format specifications, or range limits); (3) error handling is minimal, no recovery guidance, retry classification, or actionable error messages; (4) some operations modify state (create_document, edit_document, share_document, add_comment) but descriptions lack explicit warnings or confirmation patterns; (5) the server accepts opaque Google Doc IDs but does not document resolution of human-friendly names. Tools like search_documents and list_documents return useful results but lack pagination parameters (offset, limit, next_cursor) despite being discovery tools. Average parameter descriptions are ~50-80 chars, which is below the 72-char baseline for A+ tools. The naming is excellent (verb_noun pattern, clear distinctions), placing it solidly in B range, but output schema documentation and error guidance are the primary gaps holding it back from 70+.

• Add formal output schemas to tool docstrings. E.g. for read_document: 'Returns: {"title": string, "text": string, "document_id": string}'. For search_documents: 'Returns: [{"document_id": string, "title": string, "modified": ISO8601 datetime, "url": string}]'.
• Convert free-form string parameters to enums where possible. Declare share_document's 'role' as an enum in the schema: {"type": "string", "enum": ["reader", "commenter", "writer"]}. Add bounds to max_results parameters: {"type": "integer", "minimum": 1, "maximum": 100}.
• Add bounds and error guidance to edit_document's operations parameter. Define a discriminated union or explicit schema for valid operation types: insertText, deleteRange, replaceAllText. Include example: 'Valid operations: {"insertText": {"index": 0, "text": "..."}} or {"deleteRange": {"startIndex": 5, "endIndex": 10}}'.
• Update write-operation descriptions to explicitly state side effects and idempotency. E.g. create_document: 'Creates a new Google Doc (idempotent by title). Note: If called multiple times with the same title, creates separate documents.' edit_document: 'Modifies a document. This operation is reversible but permanent, all changes are applied immediately.'
• Add pagination to search_documents and list_documents. Introduce 'page_size' (default 20, max 100) and 'next_token' or 'offset' parameters. Return {"items": [...], "total_count": int, "next_token": string|null} so agents can iterate large result sets.
• Document error scenarios and recovery paths. E.g. read_document: 'If document_id is invalid, returns an error with the ID. Try search_documents() with the document title.' edit_document: 'If an operation fails (e.g. index out of bounds), returns which operation failed. Correct the index and retry.'