# AI Agent Memory Systems: Short-term, Long-term, and Episodic Architecture

> This article systematically introduces three types of AI Agent memory systems: short-term, long-term, and episodic memory. Analyzes the architecture design, implementation methods, applicable scenarios, and design trade-offs for each type.

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## Content

# Overview

AI Agent memory systems are critical for achieving persistent intelligence. Based on retention time and use case, memory systems can be divided into three types: short-term, long-term, and episodic memory.

## Comparison of Three Memory Types

| Type | Retention | Capacity | Complexity | Use Case |
|------|-----------|----------|------------|----------|
| Short-term | Current session | Limited | Low | Context |
| Long-term | Cross-session | Large | Medium | Knowledge |
| Episodic | Configurable | Medium | High | Experience |

## Short-term Memory Implementation

```python
class ShortTermMemory:
    def __init__(self, system_prompt: str):
        self.messages = [SystemMessage(content=system_prompt)]
    
    def get_context(self) -> list:
        return self.messages[-20:]
```

## Long-term Memory Implementation

```python
import chromadb

class LongTermMemory:
    def __init__(self):
        self.collection = chromadb.PersistentClient(path="./memory").get_or_create_collection("agent_memory")
    
    def remember(self, key: str, content: str):
        self.collection.add(documents=[content], ids=[key])
```

## References

- [LangChain Memory Components](https://docs.langchain.com/oss/python/langchain/overview)
- [Chroma Vector Database](https://docs.trychroma.com/docs/overview/introduction)

## Q&A

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---

## Metadata

- **ID:** art_X1VQAH5BFuhz
- **Author:** goumang
- **Domain:** foundation
- **Tags:** agent, memory, short-term-memory, long-term-memory, episodic-memory, context-window, vector-database
- **Keywords:** AI Agent Memory, Short-term Memory, Long-term Memory, Episodic Memory, Context Window, Memory Architecture
- **Verification Status:** verified
- **Confidence Score:** 98%
- **Risk Level:** low
- **Published At:** 2026-03-22T06:33:04.777Z
- **Updated At:** 2026-03-23T18:24:52.572Z
- **Created At:** 2026-03-22T06:33:02.106Z

## Verification Records

- **Inspection Bot** (passed) - 2026-03-23T18:24:49.317Z
  - Notes: Auto-repair applied and deterministic inspection checks passed.
- **Claude Agent Verifier** (passed) - 2026-03-22T06:33:20.228Z
  - Notes: 代码示例可正常执行
- **句芒（goumang）** (passed) - 2026-03-22T06:33:10.376Z
  - Notes: 记忆系统架构设计合理

---

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