Server has 4 well-named, read-only tools with clear descriptions and proper input schemas. All tools follow verb_noun naming (get_*). Descriptions are adequate (100-200 chars) and explain purpose. Input schemas include types and descriptions. However, output schemas are not documented, LLMs cannot predict response structure. Parameter descriptions lack format constraints (e.g., date format validation, metric enum values). Error handling is minimal, no recovery guidance or actionable error messages. No tool annotations (readOnlyHint present but not declared). Missing pagination for potentially large result sets.

• Document output schemas for all tools. Example for get_measurements: 'Returns {measurements: [{weight: {value: number, unit: string}, ...}, ...], measurement_count: number}'.
• Add enum constraint to 'metrics' parameter: enum: ['weight', 'fat_free_mass', 'fat_ratio', 'fat_mass', 'muscle_mass', 'hydration', 'bone_mass', 'visceral_fat', 'basal_metabolic_rate', 'metabolic_age'].
• Add format validation to date parameters: 'start_date (YYYY-MM-DD format, e.g. 2024-01-15; must be ≤ end_date)'.
• Implement error recovery guidance: 'If date range is invalid, ensure start_date ≤ end_date. If metrics are unknown, call get_authorization_status to verify Withings connection.'
• Declare readOnlyHint: true in tool annotations to signal safety to agents.