27 tools with mixed quality. Strengths: all tools have descriptions (mostly in Korean, 50-150 chars), input schemas present with type definitions, clear verb-noun naming (add_, get_, update_, delete_, search_, create_). Weaknesses: parameter descriptions are minimal or generic (many under 50 chars, e.g., 'Lead ID' for verify_salesforce_lead); output schemas documented in docstrings but not formally in JSON Schema; no error handling guidance (no recovery hints, no categorization); no tool annotations (readOnlyHint, destructiveHint); composition issues (process_customer_email_workflow combines multiple concerns); no idempotency guarantees stated; sensitive operations (delete_calendar_event, delete_company_document) lack confirmation patterns. Baseline: avg tool description ~120 chars (within 10-1024 range), avg params ~4 per tool (within baseline), but param descriptions average ~30 chars (well below 72-char baseline for A+ tools).

• Expand parameter descriptions to 50-150 chars. Example: 'event_id' → 'The unique identifier of the calendar event to modify. Obtain from get_calendar_events() response. Format: alphanumeric string, e.g. "abc123xyz".'
• Add tool annotations to all tools. Mark read-only tools with readOnlyHint=true, destructive tools with destructiveHint=true, and idempotent operations with idempotentHint=true. This enables LLMs to reason about safety and retry logic.
• Implement error categorization. Return structured errors: {status: 'error', category: 'retryable'|'user_fixable'|'fatal', message: '...', recovery_hint: 'Try X instead'}. Example: 'Invalid event_id. Try get_calendar_events() to find valid IDs.'
• Split process_customer_email_workflow into three separate tools: analyze_email_for_customer_info, generate_customer_reply, create_lead_from_customer. This allows agents to compose workflows and handle partial failures.
• Document output schemas formally in tool definitions. Add 'returns' field with JSON Schema. Example: {status: string, event: {id: string, title: string, start: string, end: string, html_link: string}}.

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

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