Single tool 'GetCountries' with severe quality gaps. The tool name does not follow verb_noun convention (should be 'get_countries' in lowercase snake_case). Source code provided does not show the actual tool definition, schema, or parameter documentation, only UI/component files and package.json. Unable to verify input schema, output schema, parameter descriptions, or error handling. The tool description in the header ('Fetches countries data from Meli API') is present but minimal (35 chars) and lacks context about when to use it, what data is returned, or pagination details. No evidence of structured output documentation. Cannot confirm if tool follows MCP SDK registration patterns or schema compliance.

• Rename tool from 'GetCountries' to 'get_countries' (lowercase snake_case per MCP conventions).
• Expand description to 100-200 characters. Include: 'Retrieves a list of countries available in the Meli marketplace. Returns country ID, name, and timezone. Use this to populate country selection forms or validate country codes. Returns paginated results (default limit 20, max 100).'
• Document input parameters explicitly: (1) Add 'limit' parameter (default 20, max 100) with description 'Number of countries per page'. (2) Add 'offset' parameter (default 0) with description 'Pagination offset'. (3) Add optional 'search' parameter (string) for filtering by country name prefix.
• Document output schema: 'Returns object with fields: (1) countries [array of {id, name, currency_code, timezone, region}] (2) total (integer, total country count) (3) limit (integer, limit used) (4) offset (integer, offset used)'.
• Add error handling guidance to description: 'On API failure, returns error with retryable: true|false. If authentication fails, check Meli API credentials. If rate limited, wait before retrying.'
• If tool requires any parameters (API key, region filter), document them with security guidance: 'API key must be provided via server environment variable MELI_API_KEY (never as a parameter).'
• Consider adding a companion tool 'search_countries' if keyword filtering is needed, or document search capability within get_countries parameters.