A Model Context Protocol server for querying Pokémon data from the PokéAPI
6 tools with consistent naming (verb_noun pattern) and parameter types defined. Descriptions are present but generic and under-optimized for LLM selection. All tools lack output schema documentation, parameter descriptions lack actionable detail, and error handling is minimal. No tool annotations (readOnlyHint, destructiveHint, idempotentHint). Tools are simple read-only operations, which helps, but the lack of structured output documentation and insufficient parameter detail prevents higher scoring.
Compare two Pokémon side by side
Get detailed information about a specific Pokémon
Get information about a Pokémon ability
Get information about a Pokémon type
Get information about a random Pokémon
Search for Pokémon of a specific type
No output schemas documented. Tools return formatted text (mcp.NewToolResultText) but LLMs cannot know what fields to expect. This forces LLMs to parse unstructured markdown and prevents reliable downstream tool chaining.
Parameter descriptions are minimal and lack actionable format/constraint detail. E.g., 'identifier' says '(e.g., 'pikachu', '25')' in description but should state format, valid ranges, and what to do if lookup fails. Description examples will be copy-pasted by LLMs.
No tool annotations (readOnlyHint, destructiveHint, idempotentHint). All 6 tools are read-only and idempotent, but the MCP schema does not declare this. Without annotations, LLMs cannot infer retry safety or distinguish these from write operations.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | F | 48 | 2026-07-28+ | v2 |
| 2026-03-09 | F | 43 | - | v1 |
search_pokemon_by_type returns a formatted string with truncation logic but no documented limit or pagination guidance. The 'limit' parameter defaults to 20 and silently truncates results without returning total_count or next_cursor. LLMs cannot reliably paginate large result sets.
Error handling returns plain-text error messages (e.g., 'Error: ' + err.Error()) with no recovery guidance. LLMs receive no hint about whether to retry, call search_*, or ask the user. No error classification (retryable vs fatal).
Tool descriptions are under-optimized for LLM selection. 'Get detailed information about a specific Pokémon' (47 chars) does not explain WHEN to use get_pokemon vs the others, what dependencies exist, or what fields are returned. Baseline A+ tools have 50-200 char descriptions.