O-Brain defines 7 tools with complete input schemas and descriptions in Korean. Naming follows verb_noun convention (search_memory, save_memory, get_memory, etc.). However, descriptions lack English translations and are optimized for Korean speakers, limiting LLM comprehension in multilingual contexts. Parameter descriptions are present but minimal (10-50 chars). Output schemas are not documented, LLMs cannot predict response structure. Error handling is absent from visible code. No parameter validation guidance (e.g., content max 1000 chars stated in description but not enforced in schema). Tool composition is sound (7 single-responsibility tools), but parameter relationships (e.g., detail enum in search_memory) lack explicit dependency documentation.

• Translate all tool and parameter descriptions to English (or provide both Korean and English). Use 50-200 char descriptions optimized for LLM comprehension: 'Search past memories using semantic + keyword hybrid. Returns brief snippets (title + excerpt) by default to save tokens; pass detail:"full" or call get_memory(id) for full content. Optionally filter by project folder.'
• Document output schemas for all 7 tools. Example for search_memory: {type: 'object', properties: {results: {type: 'array', items: {type: 'object', properties: {id: {type: 'number'}, title: {type: 'string'}, snippet: {type: 'string'}, created_at: {type: 'string', format: 'date-time'}, project: {type: 'string'}}}, total: {type: 'number'}}}
• Add JSON Schema constraints (maxLength, minimum, maximum, pattern) to parameters. Example: content: {type: 'string', maxLength: 1000}, limit: {type: 'number', minimum: 1, maximum: 50}. Remove text-only constraints from descriptions.
• Expand parameter descriptions to 50-100 chars with context. Example for query in search_memory: 'Search query string (2-200 chars). Supports keywords and semantic phrases. Matched against memory titles, content, and categories.'
• Add error handling guidance in tool descriptions. Example: 'If no results found, try broader keywords or call list_categories() to discover available topics. If save_memory fails, verify content is under 1000 chars and type is one of: 결정, 제약, 선호, 패턴, 지식.'