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