Three tools with basic verb-noun naming (create_report, get_report_status, download_report). All have descriptions (50-80 chars, below the 194-char baseline). Input schemas present with Zod validation but parameter descriptions are minimal or absent. create_report lacks description of what 'predefined settings' means; download_report description is vague about S3 URL handling. No output schema documentation. Error handling returns raw JSON or error text without recovery guidance. No pagination, no idempotent hints, no permission gates. Composition is reasonable (three separate concerns) but parameter naming lacks type suffixes (e.g., 'download_url' should clarify it's a URL string, not an ID).

• Add full parameter descriptions to all tools. For create_report: 'start_date: Start date in YYYY-MM-DD format (e.g., 2024-01-15). Must be before end_date.' For download_report: 'download_url: S3 URL returned by get_report_status. Must be a valid HTTPS URL.'
• Document output schemas in tool descriptions. E.g., 'Returns: {report_id: string, status: string, created_at: ISO8601}' so agents know what to extract.
• Enhance error messages with recovery guidance. Instead of 'Singular API error: ...', return 'API rate limit exceeded. Wait 60 seconds and retry, or contact support if the issue persists.'
• Add tool annotations: mark create_report with destructiveHint=true (consumes quota), and get_report_status + download_report with readOnlyHint=true.
• Expand create_report description to explain fixed settings: 'Creates an async report with dimensions=[app, source, unified_campaign_name], metrics=[custom_impressions, custom_clicks, custom_installs, adn_cost], time_breakdown=day, format=csv. Use get_report_status to poll for completion, then download_report to fetch the CSV.'