Single tool 'get_vacancies' has acceptable naming and schema, but the description is in Russian (non-English, reducing clarity for English-speaking LLM consumers), lacks depth about usage context, and error handling is completely absent. No documentation of output schema. Parameters have type unions and descriptions, but no constraints (e.g., min/max for perPage, enum for salary format). The tool returns raw JSON from hh.ru API without any response shaping, pagination guidance, or field documentation. Input validation and error recovery paths are missing entirely.

• Rewrite tool description in English. Current Russian description: 'Возвращает список всех вакансий. Можно передать фильтры' should be 'Searches and returns a list of job vacancies from hh.ru. Supports filtering by keyword, salary range, and results per page. Returns up to N vacancies per request; use pagination to retrieve more.'
• Document the output schema explicitly. Example: 'Returns an object with: vacancies (array of vacancy objects, each containing id, name, salary_from, salary_to, employer, published_at), total (total matching vacancies), pages (number of pages)'. Explain which fields are most relevant for LLM consumption.
• Add error handling that catches fetch errors and returns actionable messages. E.g., 'if (data.status !== 200) return { content: [{ type: 'text', text: `API error: ${data.status}. Verify searchText is valid and try again.` }] }'.
• Document 'perPage' with min/max: 'Quantity of results per page (1-100, default 20). Use with searchText to paginate through large result sets.'
• Document 'salary' parameter format and units: 'Salary filter (numeric, in rubles). Pass a number for minimum salary, e.g., 50000. Note: hh.ru API may interpret this as a range boundary, check results.'
• Implement response shaping: extract only key vacancy fields (id, name, salary, employer, published_at, link) and omit verbose metadata. Reduce JSON size by 60-80% and improve signal-to-noise ratio.
• Add input validation: URL-encode searchText using encodeURIComponent() to prevent query injection. Validate perPage is an integer in range [1, 100].

Inferred effective spec: <=2025-11-25.

• Relies on Stateful initialize / Mcp-Session-Id (removed; protocol is stateless) - make each request self-contained