Five tools with basic descriptions and schemas, but significant gaps in parameter documentation and output structure. Tool names follow verb_noun convention (health_check, execute_query, list_metrics). Descriptions exist but are generic (avg ~60 chars, below 194-char baseline). Critical issue: execute_query and execute_range_query lack parameter descriptions for 'time', 'start', 'end', 'step', LLMs cannot infer format constraints (RFC3339 vs Unix timestamp ambiguity). No output schemas documented. No error handling guidance. Health_check and list_metrics have empty input schemas ({}), which is acceptable, but no documentation of what fields they return. get_metric_metadata accepts 'metric' param but no description of format or how to discover valid metric names. No pagination support for list_metrics despite Prometheus potentially returning hundreds of metrics.

• Add parameter descriptions to execute_query and execute_range_query. Example: 'time: RFC3339 timestamp or Unix seconds (default: current time). E.g., "2024-01-15T10:30:00Z" or "1705318200"'.
• Document output schemas for all tools. Example for execute_query: 'Returns {status: string, data: {resultType: string, result: array of {metric: object, value: [timestamp, value]}}, warnings?: array}'.
• Add pagination to list_metrics: introduce 'limit' (default 50, max 500) and 'offset' parameters. Return {metrics: array, total: number, offset: number} to enable iteration.
• Add dependency hints in parameter descriptions. Example for get_metric_metadata: 'metric: Name of the metric (string). Call list_metrics first to discover available metrics.'
• Implement error classification and recovery guidance. Example: 'If Prometheus is unreachable, check PROMETHEUS_URL configuration and network connectivity. Retry after 5 seconds.'

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

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