Comparison
HazelJS vs Agno AgentOS
Agno AgentOS is a Python FastAPI runtime for agents. HazelJS Agent OS is TypeScript-native: DNA, Skillgate, Gatekeeper, and crash-safe HITL in the same DI app as your APIs.
Updated October 11, 2026
HazelJS vs Agno AgentOS
TL;DR
- Agno AgentOS is a Python FastAPI runtime that turns agent definitions into a served API / MCP service with sessions, RBAC, tracing, and a control plane.
- HazelJS Agent OS is a TypeScript-native lifecycle inside your existing Node backend: DNA packages, Decision Runtime, Skillgate, Gatekeeper, crash-safe HITL, and local apply — same DI container as your APIs.
- Choose Agno when your stack is Python and you want a FastAPI-shaped agent server.
- Choose HazelJS when your product APIs and agents must share one TypeScript codebase — clone Meridian.
Who this is for
Teams comparing:
- Python agent platforms vs TypeScript backends
- “Serve agents as FastAPI” vs “agents inside the same app as REST”
- Multi-framework Python adapters (LangGraph, Claude Agent SDK) vs a TypeScript Agent OS kernel
Stay on Agno if your org is standardized on Python agent stacks and FastAPI ops.
Scope difference
| Layer | Agno AgentOS | HazelJS Agent OS |
|---|---|---|
| Language | Python | TypeScript / Node.js |
| Serve model | Pre-built FastAPI app for agents | Agents run inside your HazelApp (HTTP + DI) |
| Framework adapters | Agno, LangGraph, DSPy, Claude Agent SDK, … | Native @hazeljs/agent; call other libs if needed |
| Packaging | Agno component versions | Agent DNA + Store + local apply |
| Tool governance | Platform RBAC / approvals | Skillgate curation + Gatekeeper fail-closed |
| Durable HITL | Sessions, background work, approvals | Durable AgentRun suspend / resume + worker leases |
| Control plane | Agno Control Plane (optional) | Local apply / Definitions; hosted registry optional |
Side-by-side
| Aspect | Agno AgentOS | HazelJS Agent OS |
|---|---|---|
| Primary metaphor | FastAPI for agents | Agent OS inside your TypeScript backend |
| Where agents live | Dedicated AgentOS process | Same process / DI as your APIs |
| OpenAPI → tools | Integrations / MCP | Skillgate fromOpenApi / fromModule |
| Speculative undo | Outside core story | @hazeljs/agent-vm (@Speculate, @Compensate) |
| Closed-set decisions | Bring your own | Native @hazeljs/decision |
| npm / Node teams | Secondary | First-class |
Code sketch (HazelJS)
import { Agent, Tool } from '@hazeljs/agent';
@Agent({
name: 'support-desk',
systemPrompt: 'Help with orders; escalate refunds.',
})
export class SupportDesk {
@Tool({
name: 'refund_order',
description: 'Issue a refund',
requiresApproval: true,
})
async refundOrder(orderId: string, amount: number) {
// Real TypeScript side effect — DNA never stubs this
return { orderId, amount, status: 'pending_approval' };
}
}
Agents execute via AgentRuntime / AgentOS next to your controllers — not a separate Python service you must glue to Node.
When to choose which
Choose Agno AgentOS when:
- Python is the agent language of record
- You want a FastAPI-shaped multi-framework runtime and Agno’s control plane
Choose HazelJS Agent OS when:
- Backend engineers ship TypeScript APIs and agents together
- You need DNA packaging, Skillgate, Gatekeeper, and crash-safe HITL without a second language runtime
How to try HazelJS
- Agent OS lander
- Clone Meridian:
git clone https://github.com/hazel-js/hazeljs-meridian-ops.git - Guide: Agent OS guide
Related
FAQ
- Is HazelJS Agent OS the same as Agno AgentOS?
- No. Agno AgentOS is a Python FastAPI runtime that serves agents as an API/MCP service. HazelJS Agent OS is TypeScript-native and runs inside the same DI app as your HTTP APIs.
- When should I pick Agno?
- Pick Agno when Python is your agent language of record and you want a FastAPI-shaped multi-framework runtime with Agno’s control plane.
- When should I pick HazelJS?
- Pick HazelJS when TypeScript backend teams need DNA packaging, Skillgate-governed REST tools, Gatekeeper authorization, and crash-safe HITL next to their APIs.
- Does HazelJS replace Python agent stacks?
- Only for teams that want TypeScript end-to-end. Python-heavy orgs often stay on Agno, LangGraph, or similar.
Docs & next steps
Related comparisons
- HazelJS vs Builder Methods Agent OS
Same “Agent OS” words, different jobs: Builder Methods shapes coding-agent specs; HazelJS runs durable product agents inside your TypeScript backend.
- HazelJS vs AgentOS (agentos.sh)
agentos.sh is a TypeScript agent framework with cognitive memory and orchestration. HazelJS Agent OS packages durable agents (DNA, Skillgate, HITL) inside your Nest-familiar backend.
- NestJS + LangChain vs HazelJS
Nest + LangChain works but creates two paradigms. HazelJS Agent OS unifies durable agents, DNA, Skillgate, and local apply in the same DI app as your APIs.