Three tools with clear verb-noun naming (search_crates, get_crate, get_versions) and solid descriptions (avg 155 chars, within 10-1024 baseline). All tools have complete input schemas with type definitions and required fields. However, output schemas are NOT documented, LLMs cannot predict return structure. Parameter descriptions are minimal (e.g., 'Crate name' lacks format/constraint guidance). No error handling guidance, no pagination documentation for search results, no per-parameter type suffixes (e.g., 'crate_name' vs 'name'). Missing tool annotations (readOnlyHint, idempotentHint). Transport unknown, cannot assess protocol readiness fully.

• Document output schemas for all three tools. Example for search_crates: 'Returns {total: number, crates: [{name: string, description: string|null, downloads: number, newest_version: string, repository: string|null, homepage: string|null, updated_at: string}]}'.
• Add min/max constraints to numeric parameters in schema. For 'limit' in search_crates: add 'minimum': 1, 'maximum': 100 to inputSchema.properties.limit.
• Enhance parameter descriptions with format/constraint details. E.g., 'Crate name (case-sensitive, alphanumeric + hyphens, 1-64 chars)' instead of 'Crate name'.
• Add error recovery guidance in tool descriptions. E.g., 'If crate not found, try search_crates() with a partial name or keyword.' Catch and rethrow errors with actionable messages.
• Declare tool annotations in tool definitions: add 'readOnlyHint': true to all three tools (they are read-only, idempotent, safe to retry).