memex demonstrates solid definition quality with clear tool names, comprehensive parameter descriptions, and good schema structure. All 4 tools follow verb_noun naming (store_, search_, delete_, count_) with explicit action semantics. Parameter descriptions are detailed (average ~100 chars), covering constraints, defaults, and use cases. Input schemas are present and typed for all tools. However, output schemas are not formally documented, tools return plain strings rather than structured JSON objects with typed fields. Error handling provides contextual guidance ('Invalid memory_type, must be one of: episodic, semantic, procedural') which is good, but no structured error categories or retry guidance. The server lacks tool annotations (destructiveHint for delete_memory, readOnlyHint for search_memories/count_memories) which would be valuable for agent planning.

• Define explicit output schemas for all tools. Example: store_memory should return {"memory_id": string, "type": string, "importance": float, "stored_at": ISO8601} instead of a plain string message.
• Add destructiveHint and readOnlyHint annotations to tool definitions via fastmcp's decorator API (if supported) or MCP schema. This guides agent planning and prevents unintended modifications.
• Restructure search_memories to return JSON: {"query": string, "results": [{"id": string, "type": string, "content": string, "score": float, "created_at": ISO8601}], "total": int, "next_cursor": string | null} to support structured processing and pagination.
• Implement a confirm_delete_memory tool or add a 'confirm' parameter to delete_memory requiring explicit approval. Alternatively, return a confirmation token that must be passed in a second call.
• Add structured error responses with category field: {"error": string, "category": "invalid_input|not_found|permission_denied|internal_error", "recovery_hint": string}. This lets agents decide whether to retry, ask the user, or fail fast.
• Document parameter constraints more formally. Example: content max length (currently 8000 chars) should be enforced with a maxLength JSON Schema constraint, not just mentioned in description.
• Add examples of memory_type filtering to search_memories description to clarify that memory_type parameter is optional and filters results to a specific type (not required).
• Provide batch variants for large-scale operations. Example: store_memories accepting an array of memory objects, enabling agents to avoid N sequential store_memory calls.