Strong foundation with 11 well-named tools covering email operations. All tools have descriptions (avg 85 chars) and input schemas with typed parameters. Naming follows verb_noun convention (message-get, label-add, message-search). However, parameter descriptions are sparse, many lack detail on constraints, formats, or dependencies. Output schemas are not documented. Error handling guidance is absent. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite clear risk levels. Batch operations (label-add, label-delete, message-mark-read) accept arrays but lack per-item error reporting.

• Document output schemas for all tools. For message-search, specify: {messages: [{id, subject, from, date, preview}], total, hasMore}. For message-send/respond, return {messageId, sentTime, status}.
• Add per-item error reporting to batch operations. Change label-add response from boolean to {results: [{messageId, success, error?}], failedCount}.
• Annotate tools with readOnlyHint/destructiveHint. Mark message-send, message-respond, label-add, label-delete, message-move-to-trash as destructive. Mark categories-list, labels-list, message-get, message-search as readOnly.
• Enhance parameter descriptions with constraints. For message-search 'query', add: 'Outlook KQL syntax (e.g., from:[email protected] subject:urgent). See Outlook query syntax prompt for examples.' For 'limit', specify: 'Range: 1 - 1000, default 10.'
• Add error recovery guidance. For message-get, append: 'If message not found, try message-search() with sender or subject filters.' For message-send, append: 'If recipient invalid, verify email format or use search to find correct address.'

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

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