Recommended Winning Stack (2026)

Layer 
 
 
 Choice 
 
 
 
 
 API 
 
 
 FastAPI 
 
 
 
 
 Agent Framework 
 
 
 LlamaIndex 
 
 
 
 
 Workflow 
 
 
 LlamaIndex Workflows 
 
 
 
 
 Tool Interoperability 
 
 
 MCP (2026-07-28 spec, stateless) 
 
 
 
 
 Vector Memory 
 
 
 ChromaDB 
 
 
 
 
 Graph Memory 
 
 
 Neo4j 
 
 
 
 
 Agent Memory Layer 
 
 
 Mem0 / Zep (tiered, benchmarked) 
 
 
 
 
 SQL 
 
 
 PostgreSQL 
 
 
 
 
 Models 
 
 
 Groq / vLLM served OSS models 
 
 
 
 
 Policies 
 
 
 OPA 
 
 
 
 
 Observability 
 
 
 Langfuse + OpenTelemetry 
 
 
 
 
 Queue 
 
 
 Redis 
 
 
 
 
 Automation 
 
 
 N8N