# EnterpriseAgentStack.com (llms.txt)
> The Category-Defining Reference Architecture for Production AI Agents

## Primary Positioning
EnterpriseAgentStack is the complete reference architecture for production AI agents.
It defines how enterprise agents are built, supplied with models and context, connected to tools, assigned identity and authority, controlled during execution, evaluated, observed, approved, audited, deployed, and revoked.

## Central Architecture Principle
"The model proposes. The runtime decides. The evidence proves."

- Intelligence: The model generates proposals and reasoning.
- Authority: The control plane defines permitted boundaries.
- Runtime Control: Pre-action PDP/PEP enforces policies before execution.
- Evidence: Immutable Decision Receipts document every action and outcome.

## The 15 Architecture Stack Layers
Group A: Business and behavior
1. Agent Applications and Workflows (/layers/agent-applications)
2. Agent Framework and Runtime (/layers/agent-framework-runtime)

Group B: Intelligence and capabilities
3. Models and Intelligence (/layers/models-intelligence)
4. Tools and Capabilities (/layers/tools-mcp-capabilities)
5. Context and Knowledge (/layers/context-knowledge)
6. Agent Memory (/layers/agent-memory)

Group C: Identity and control
7. Agent Identity and Ownership (/layers/agent-identity-ownership)
8. Authority and Delegation (/layers/authority-delegation)
9. Policy and Runtime Enforcement (/layers/runtime-policy-enforcement)
10. Human Escalation and Approval (/layers/human-approval)
11. Runtime Budget Governance (/layers/runtime-budget-governance)

Group D: Reliability and evidence
12. Agent Observability (/layers/agent-observability)
13. Evaluation (/layers/agent-evaluation)
14. Audit and Decision-Grade Evidence (/layers/evidence-audit)

Group E: Infrastructure
15. Deployment and Operations (/layers/deployment-operations)

## Commercial Bridge
Enterprise Hypervisor is the governed execution layer that controls the stack across existing frameworks, clouds, and tools.

## Key Resources
- Reference Architecture: /reference-architecture
- Interactive Assessment: /agent-stack-assessment
- Maturity Model: /maturity-model
- Production Readiness Checklist: /production-readiness
- Build vs Buy Decision Guide: /build-vs-buy
- Implementation Roadmap: /implementation-roadmap
- Glossary: /glossary
- Comparison Center: /compare