Agent memory
Storage an agent reads and writes across steps or sessions, outside the context window.
Memory lets an agent persist facts, preferences and progress beyond a single context. Short-term memory is the scratchpad within a run; long-term memory is a store (vector database, key-value, graph, plain files) queried before each step. Benchmarks such as LoCoMo and LongMemEval measure retrieval quality over long conversations. Stack Overflow found Redis (42.9%) and GitHub's MCP server (42.8%) are the most-used memory/data tools among agent builders.