Want to stand out as an AI Engineer in 2026?
𝗠𝗮𝘀𝘁𝗲𝗿 𝘁𝗵𝗲 𝗖𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗠𝗲𝗺𝗼𝗿𝘆 𝗧𝗮𝘅𝗼𝗻𝗼𝗺𝘆 𝗳𝗼𝗿 𝗔𝗜 𝗔𝗴𝗲𝗻𝘁𝘀.
I spent hours mapping the complete memory taxonomy for AI Agents by duration, storage type, function, and scope:
𝗕𝗬 𝗗𝗨𝗥𝗔𝗧𝗜𝗢𝗡
》 𝗦𝗵𝗼𝗿𝘁-𝗧𝗲𝗿𝗺 / 𝗜𝗻-𝗖𝗼𝗻𝘁𝗲𝘅𝘁
Lives in the context window. Dies when the session ends.
↳ Tools: LangGraph AgentState, PydanticAI RunContext, ConversationBufferMemory
》 𝗟𝗼𝗻𝗴-𝗧𝗲𝗿𝗺 / 𝗘𝘅𝘁𝗲𝗿𝗻𝗮𝗹
Persists outside the model. Survives restarts and redeployments.
Requires retrieval, adds latency.
↳ Tools: ChromaDB, Qdrant, FAISS, Pinecone, Zep, Mem0
𝗕𝗬 𝗦𝗧𝗢𝗥𝗔𝗚𝗘 𝗧𝗬𝗣𝗘
》 𝗩𝗲𝗰𝘁𝗼𝗿 / 𝗦𝗲𝗺𝗮𝗻𝘁𝗶𝗰
Retrieved by similarity, not exact match.
Best for: knowledge bases, documents, past experiences.
↳ Tools: ChromaDB, FAISS, Weaviate
》 𝗦𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗲𝗱 / 𝗘𝗽𝗶𝘀𝗼𝗱𝗶𝗰
SQL/NoSQL. Retrieved by exact query.
Best for: patient records, user profiles, transaction logs.
↳ Tools: PostgreSQL, LangChain SQLChat
》 𝗖𝗮𝗰𝗵𝗲
Key-value. Fastest retrieval of all memory types.
Best for: repeated API calls, re-embedding same documents.
↳ Tools: Redis, GPTCache, LangChain
》 𝗚𝗿𝗮𝗽𝗵
Entities relationships. Retrieved by traversal.
Best for: complex interconnected facts.
↳ Tools: Neo4j, GraphRAG, LlamaIndex KG
𝗕𝗬 𝗙𝗨𝗡𝗖𝗧𝗜𝗢𝗡
》 𝗦𝗲𝗻𝘀𝗼𝗿𝘆
Raw input buffer before processing. Lasts milliseconds.
》 𝗪𝗼𝗿𝗸𝗶𝗻𝗴
Active reasoning scratchpad. Chain-of-thought lives here.
↳ Read here:
lnkd.in/e5zJxQ4t
》 𝗘𝗽𝗶𝘀𝗼𝗱𝗶𝗰
Specific past events. Enables personalization across sessions.
↳ Tools: Zep, Mem0
》 𝗦𝗲𝗺𝗮𝗻𝘁𝗶𝗰
General world knowledge. Your RAG layer.
↳ Read here:
lnkd.in/e5YydeWM
》 𝗣𝗿𝗼𝗰𝗲𝗱𝘂𝗿𝗮𝗹
How to do things. Encoded in system prompts tool definitions.
↳ Tools: DSPy, LangGraph node definitions, CrewAI task schemas
》 𝗦𝘁𝗿𝗮𝘁𝗲𝗴𝗶𝗰 / 𝗠𝗲𝘁𝗮
Agent memory of its own past decisions. Self-improvement.
↳ Reflexion:
lnkd.in/eQ5nabJz
𝗣𝗥𝗢𝗗𝗨𝗖𝗧𝗜𝗢𝗡 𝗙𝗔𝗜𝗟𝗨𝗥𝗘𝗦
✸ Memory Poisoning
bad data written once corrupts all future retrievals
✸ Memory Drift
behavior slowly degrades as episodic memory accumulates bias
✸ Context Stuffing
shoving everything in, destroying reasoning quality
✸ Retrieval Hallucination
agent retrieves a chunk, misreads it, confidently fabricates
✸ Memory Conflicts
two agents write contradictory facts to shared memory simultaneously
✸ Cache Staleness
agent acts confidently on expired information
↳ Fix all 6:
lnkd.in/ehzukdwC
≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣≣
⫸ꆛ Join 46,000 engineers building production-grade AI agents.
Start with the 30-minute Zero → Hero training:
maryammiradi.com/free-ai-age…