mcp-memory demonstrates foundational tool definition structure but suffers from significant gaps in parameter descriptions, output schema documentation, and error handling guidance. All 12 tools are explicitly registered with names, input schemas via Zod, and basic descriptions. However, parameter-level documentation is largely absent (no descriptions for individual fields like 'id', 'title', 'content', 'query', etc.), and output schemas are not documented for any tool, agents cannot plan downstream calls or understand what fields to expect. The codebase shows attempt at validation (Zod schemas) and basic error handling (null checks, try-catch), but error responses lack actionable recovery guidance. Naming is mostly correct (verb_noun convention: create_memory, search_memories, delete_memory), but some tools expose implementation details (rebuild_index, build_memory_store) rather than user-intent language. Most critically, the returned content is hardcoded text responses ('Memory created with ID: ...') rather than structured objects, violating the pattern:response-shaper baseline that 100% of A+ tools document return types.

• ADD PARAMETER DESCRIPTIONS to all 12 tools. For each parameter, write 1 - 2 sentences explaining what it controls, valid formats, and constraints. Example for 'query' in search_memories: 'Text query to search memory titles and content. Minimum 1 character.'
• DOCUMENT OUTPUT SCHEMAS. Modify tool handlers to return structured objects instead of text. Example for create_memory: return {success: true, memory_id: string, title: string, type: enum, created_at: ISO8601}. Update tool descriptions to declare 'Returns: object with fields [memory_id, title, type, created_at, tags, importance]'.
• ADD ACTIONABLE ERROR MESSAGES. When a memory is not found, return error message with next steps: 'Memory with ID {id} not found. Try search_memories(query="{partial_title}") to find it.' Categorize errors as retryable (ID not found: try search) vs fatal (invalid type enum).
• RENAME 'rebuild_index' to 'reindex_memories' or 'optimize_search' and add description explaining when to call (e.g., 'after bulk create/delete') and expected duration.
• DOCUMENT RELATIONSHIP SEMANTICS in relate_memories and unrelate_memories. Clarify: are relationships directional? Can you have multiple relationship types? What is the return value (relationship ID, confirmation)?
• CLARIFY update_memory BEHAVIOR in description: 'Partially updates a memory. Only provided fields are modified; omitted fields retain their current values. To replace all content, explicitly set each field.'
• ADD CONFIRMATION FLOW for delete_memory. Either require an explicit 'confirm_delete: true' parameter, or document that agents should call a separate 'confirm_delete_memory()' tool before actual deletion (pattern:confirmation-request).