Three tools with complete schemas, descriptions, and tool annotations. Naming is clear (verb_noun pattern). Descriptions are well-written (100-200 chars, within baseline). All parameters have types and descriptions. Error handling returns structured objects with hints. Main gaps: output schemas not formally documented; no pagination support (not needed for these tools); parameter descriptions could be more prescriptive about format/constraints.

• Document output schemas for each tool. For call_model, specify: {text: string, tokens_used: number, model: string}. For list_models: {models: [{id: string, name: string, price_per_million: number}], source: string}. For account_status: {quota_remaining?: number, balance?: number, subscription_window?: string}.
• Add format constraints to model parameter: 'Must match a model ID from list_models output (e.g., mirai-1, mirai-2). Invalid IDs return a 400 error with available options.'
• Enhance max_tokens description: 'Optional output token limit (1 - 4096). Requests exceeding the model's max_tokens are clamped. Defaults to model maximum.'
• Classify errors in errorResult(): add a 'retryable' boolean field. 401 (auth) → false; 429 (rate limit) → true; 500 (server) → true; 400 (bad input) → false.
• Add a discovery note to call_model: 'Call list_models first to see available model IDs and pricing. Use account_status to check remaining quota before making expensive calls.'