Four tools with complete schemas and reasonable descriptions. Naming follows verb_noun convention (exchange_rate, hicp_inflation, get_data, list_dataflows). Descriptions are 80-200 chars, meeting baseline. However, parameter descriptions lack detail on constraints, valid ranges, and format expectations. No output schema documentation. Error handling is minimal, no recovery guidance or actionable error messages. Missing idempotency hints and permission declarations. Tools are well-scoped (single responsibility) but lack composition guidance.

• Document output schema for each tool. Example for exchange_rate: 'Returns {series_key: string, dimensions: {[key]: string}, observations: [{period: string, value: number|null}]}'
• Convert parameter descriptions to formal constraints. Replace 'Observation frequency, D (daily), M (monthly), Q (quarterly), A (annual). Default D.' with enum: ['D', 'M', 'Q', 'A'] and description: 'Frequency code. Defaults to D (daily).'
• Add error recovery guidance in callTool(). Catch 404 and return: 'No data found for this flow/key. Call list_dataflows() to verify the flow exists, or check the key format (dot-separated dimensions).'
• Declare required parameters explicitly in inputSchema.required arrays. E.g., hicp_inflation should clarify if country defaults to U2 or is required.
• Add pagination support to list_dataflows and get_data. Accept limit (1-100, default 20) and offset parameters. Document max result count in descriptions.