GA4 server has solid naming (verb-first: run_report, get_metadata, mark_key_event, grant_access) and complete input schemas with type definitions. Descriptions are present but brief (avg ~60 chars, below the 194-char baseline). All parameters have descriptions, but several lack format/constraint details (e.g., 'role' in grant_access lists examples 'roles/viewer' but no enum). Tool annotations are correctly declared (readOnlyHint, destructiveHint, idempotentHint). Output schemas are not documented in the visible code, no return type specifications for any tool. Error handling is minimal; no recovery guidance or categorization visible. Rate limiting is implemented but optional. Overall: functional definitions with room for richer descriptions and output documentation.

• Document output schemas for all tools. Specify return types: e.g., run_report returns {rows: [{dimension_values: string[], metric_values: string[]}], row_count: int, total_count: int}. This enables LLMs to chain calls and extract required fields.
• Add enum constraints to 'role' parameter in grant_access: {type: 'string', enum: ['roles/viewer', 'roles/editor', 'roles/analyst', 'roles/editor_restricted']}. Replace examples with formal constraints.
• Expand descriptions to 80-150 chars. Example: 'Run a GA4 report with specified dimensions, metrics, and filters. Call get_metadata first to discover available dimensions and metrics for your property. Returns rows of data with optional pagination.'
• Add error handling guidance in tool descriptions. E.g., 'If property_id is invalid, returns error with available properties. If dimensions/metrics are unsupported, call get_metadata to list valid options.'
• Add pagination support to run_report: accept 'offset' (default 0) and 'limit' (default 10000, max 100000), return 'total_count' and 'next_offset' in response. Document in description: 'Results are paginated; use offset/limit for large datasets.'

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

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