OrchestrUI demonstrates solid tool design with clear naming, comprehensive parameter schemas, and structured output. All 7 tools follow verb_noun conventions (inspect_, list_, recommend_, get_, search_, audit_). Descriptions are substantive (100-500 chars), exceeding the 10-1024 baseline. Input schemas are well-typed with enums, length constraints, and nested objects. However, output schemas are not explicitly documented in the visible code, only inferred from implementation. Error handling is minimal; tools lack recovery guidance. The recommend_stack tool has a complex nested schema that could benefit from clearer parameter relationships documentation.

• Add explicit output schema documentation to each tool. Use JSDoc or inline comments to define return object structure, field types, and required vs. optional fields. Example: '@returns {Object} {libraries: Array<{id, name, roles}>, count: number, policy: Object, provenance: Array}'
• For recommend_stack, add a parameter relationship matrix in the description: 'Either provide task (string) for legacy inference, OR provide host_profile + task_profile for structured routing. Do not mix both approaches.'
• Enhance error handling with recovery hints. Example for get_library_guidance: 'If library_id is invalid, call list_libraries() to discover available IDs.'
• Document search_components fallback behavior: 'If live=true and registry is unavailable, automatically returns catalog-fallback results. Check the mode field in response to detect fallback.'
• Add parameter constraints to descriptions where JSON Schema alone is insufficient. Example for audit_plan: 'verifications array must include all 9 categories; missing categories will cause validation failure.'