Mixed quality across 18 tools. Naming is generally action-verb-based and clear (cook, add, sum, multiply, divide, list_messages, search_messages, read_message, create_draft, etc.), following the verb_noun pattern well. Descriptions are present for all tools but vary in quality, most are 20-60 characters, which is on the lower end of the ideal 50-200 char range. All visible tools have input schemas with proper types and parameter descriptions. However, critical gaps exist: (1) no output schemas are documented, LLMs cannot plan downstream calls without knowing what fields to expect; (2) no error handling guidance in any tool, no recovery messages or classification; (3) no pagination support on list/search tools despite potentially large result sets (list_messages, search_messages, list_files, search_files, list_folders, recent_files); (4) no tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite clear semantics (create_draft is WRITE, others are READ_ONLY); (5) create_draft tool lacks confirmation/dry-run despite being a state-mutating operation. The calculator tools (add, sum, sum_many, multiply, divide, explain_calculation) are simple and well-formed but extremely generic, no domain-specific context. Gmail and Google Drive tools are more substantial but lack pagination and clear error scenarios.

• Document output schemas for ALL tools. For each tool, explicitly define the response object structure (fields, types, meanings). Example: cook returns {status: string, temperature: number, duration_minutes: number}.
• Add tool annotations to tool registration. Mark create_draft with destructiveHint=false (does not send, only drafts) and readOnlyHint=false. Mark all read/list/search tools with readOnlyHint=true.
• Implement pagination on list_messages, search_messages, list_files, search_files, list_folders, recent_files. Add offset+limit or cursor parameters; document max_results as a hard cap (e.g., 50) and explain when to paginate.
• Enhance error handling. Replace generic error strings with structured guidance. Example: cook() returns {error: 'Cooking time must be > 0 seconds', suggestion: 'Try a value between 60 and 3600'}.
• Add confirmation step for create_draft. Either (a) make it a dry-run tool that returns a preview, or (b) add a send_draft tool so the agent controls when email leaves the inbox.
• Expand tool descriptions to 80-150 characters. For each tool, answer: What does it do? When use it instead of a similar tool? What does it return? Example: 'Search Gmail messages by query (from:, subject:, is:unread). Returns matching message IDs and summaries. Call read_message with a message_id to fetch full content.'
• Document response field names and types in descriptions. Example: list_messages returns [{message_id, sender, subject, snippet, date}]. Helps LLMs extract data for downstream tool calls.