Memory MCP has clear, well-structured tool definitions with consistent naming (verb_noun pattern) and comprehensive descriptions. All 7 tools have input schemas with Zod validation and type definitions. However, output schemas are not formally documented, responses are text-only without structured field definitions. Parameter descriptions are present but some lack constraint details (e.g., no length limits on title/content). Error handling is minimal; tools return generic success/failure messages without recovery guidance. The update_memory tool has excellent instructional descriptions but no validation that content actually preserves original data. Missing: pagination for list_memory_titles, structured output schemas, and actionable error messages.

• Document output schemas for all tools. Define structured response objects with typed fields (e.g., {memories: [{filename, title, priority, lastAccessedAt, content}], total_count, next_cursor}). This enables LLMs to extract and chain data reliably.
• Add actionable error messages. Replace 'Memory not found' with 'Memory "old-notes.md" not found. Available memories: project-notes.md, meeting-2024.md. Try list_memory_titles() to see all.' This guides LLM recovery.
• Add parameter constraints. Specify max length for title (e.g., 200 chars) and content (e.g., 50KB). Document filename format (alphanumeric + hyphens/underscores). Include in descriptions: 'title: 1-200 characters, alphanumeric + spaces'.
• Implement pagination for list_memory_titles. Add optional limit (default 20, max 100) and offset parameters. Return {titles: [...], total_count, has_more}. This prevents context window exhaustion with large memory collections.
• Add server-side validation for update_memory. Detect if new content is a summarization or condensation of original. Return error: 'Content appears to be summarized. Preserve original content and append new information.' This enforces the preservation requirement.