02
The production stack
Six layers, bottom to top
Verified A common taxonomy of the production agent stack. The layer count is one framing among several (7-layer variants exist) — but the layers themselves are broadly agreed. Hover a layer.
06
Guardrails & Safety
input/output filtering · sandboxing · authorization
PII & injection blocking · IAM · audit
05
Eval & Observability
tracing · evals · monitoring · telemetry
LangSmith · Langfuse · Arize · Braintrust · Galileo · OTel
04
Frameworks & SDKs
agent loops · state graphs · orchestration
LangGraph · CrewAI · AutoGen · OpenAI SDK · ADK · Claude SDK
03
Memory & Knowledge
short/long-term memory · RAG · vector DBs
Mem0 · Letta · Zep · Redis · vector indexes
02
Protocols & Tools
agent↔tool + agent↔agent standards
MCP · A2A · tool-calling schemas
01
Models & Inference
frontier LLMs · endpoints · multi-model routing
Claude · GPT · Gemini · routing layer