The magisterium_query tool has a clear action-verb name and a reasonable description. The input schema is present with proper JSON Schema structure and all parameters have descriptions. However, there are moderate gaps: the description is relatively brief (135 chars, below the rubric baseline of 194 chars for A+ tools), and critically, there is NO documented output schema. The server provides no guidance on what the Magisterium API response structure looks like, what fields the LLM should expect, or how to chain results into downstream tools. This violates the pattern:tool-schema requirement and forces LLMs to guess at response structure. Error handling is minimal, no guidance on retryable vs fatal errors, no timeout documentation, and no recovery hints. The tool lacks any error classification or user-fixable guidance.

• Add a complete output schema to the tool definition. Document the response structure: { choices: [{ message: { content: string } }], citations?: [{ cited_text, document_title, source_url, ... }], related_questions?: string[] }. This enables LLMs to know what fields to extract and chain results into downstream tools.
• Expand the tool description to 180 - 250 characters. Include WHEN to use it (answering questions about Catholic Church teaching), WHAT it returns (authoritative responses with citations), and any prerequisites (MAGISTERIUM_API_KEY environment variable required). Avoid examples like 'magisterium-1' in the description; use the enum constraint instead.
• Document the response structure for each parameter. For 'model', list valid values explicitly or link to API documentation. For 'return_related_questions', explain that it appends a 'related_questions' array to the response if true.
• Add error handling guidance to the tool description: 'If the API returns a 401, the MAGISTERIUM_API_KEY is missing or invalid. If 429, you are rate-limited, wait before retrying. If 500, the service is temporarily unavailable, retry after a delay.'
• Document the 30-second timeout in the tool description: 'Requests that take longer than 30 seconds will be aborted. This is a network timeout, not a permanent failure, retry is safe.'
• Add an explicit idempotency note: 'This tool is read-only and idempotent. Calling it multiple times with the same query produces the same response, it is safe to retry on network failures.'

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

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