This polyglot MCP server (Go, Java implementations) exposes 2 tools for periodic table element lookup. Both tools have reasonable names (verb-based: get_element, get_element_by_position) and documented input schemas with type definitions. However, there are critical gaps: tool descriptions are present but very short (Chinese language, ~30-40 characters), parameter descriptions lack detail about constraints and formats, output schemas are not documented, and no error handling guidance is visible. The implementation appears functional but lacks the completeness expected of production tools. Input schemas are visible and properly typed (string for name, number for position), which prevents a lower score, but missing output documentation and sparse parameter guidance pull the overall score into the 'Fair' range.

• Expand tool descriptions to 80-150 characters in English, explicitly stating: (1) what the tool does, (2) what input it expects, (3) what it returns, (4) when to use it vs the other element lookup tool. Example: 'Retrieve periodic table element details by Chinese name. Returns atomic number, symbol, atomic mass, electron configuration. Use this when you have the element name; use get_element_by_position for atomic number lookups.'
• Add constraint descriptions to all parameters. For 'name': 'Chinese element name (e.g., 氢 for hydrogen). Must match exactly; case-sensitive. Valid range: all 118 known elements.' For 'position': 'Atomic number (1-118). Returns error if outside range.'
• Document the output schema explicitly. Include a comment or separate field listing: element_name (string), symbol (string), atomic_number (integer), atomic_mass (float), electron_configuration (string), category (string, e.g. noble_gas, transition_metal), etc.
• Add error handling guidance: 'If element not found, respond with: "Element 'xyz' not found. Valid elements range from 1 (氢) to 118 (Og). Try get_element_by_position() if you have the atomic number."'
• Translate all descriptions to English to maximize compatibility with English-trained LLMs.
• Consider adding a third discovery tool (e.g., 'list_elements' or 'search_elements') that returns a summary of all 118 elements or allows filtering by category (noble gases, metals, etc.). This helps agents explore the available data before making specific queries.

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

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