Comparison
HazelJS vs VoltAgent
VoltAgent focuses on typed agents, workflows, and VoltOps observability. HazelJS Agent OS focuses on DNA, Skillgate, Gatekeeper, and crash-safe HITL next to your APIs.
Updated October 11, 2026
HazelJS vs VoltAgent
TL;DR
- VoltAgent is an open-source TypeScript AI agent framework (plus VoltOps console) focused on typed agents, workflows, MCP, memory, and observability.
- HazelJS Agent OS is the production lifecycle for durable agents inside your TypeScript backend: DNA, Skillgate, Gatekeeper, crash-safe HITL, Decision Runtime, and local apply — with Nest-familiar HTTP/DI.
- Choose VoltAgent when you want a dedicated agent engineering platform with strong tracing/console workflows.
- Choose HazelJS when agents and REST APIs must share one DI app and you need DNA packaging + governed OpenAPI skills — clone Meridian.
Who this is for
Teams shortlisting TypeScript agent frameworks after searching “agent os typescript” or “TypeScript AI agent framework”.
Side-by-side
| Aspect | VoltAgent | HazelJS Agent OS |
|---|---|---|
| Focus | Agent engineering platform + OSS framework | Agent OS kernel inside a TypeScript backend |
| HTTP / DI | Server adapters (e.g. Hono) | @hazeljs/core modules + controllers |
| Packaging | Framework packages + console | Agent DNA + Store + local apply |
| Tool governance | Tools, MCP, guardrails | Skillgate + Gatekeeper |
| Durable HITL | Platform / workflow patterns | Durable AgentRun + worker leases |
| Observability | VoltOps / tracing-first | Inspector timelines + OTel hooks |
When to choose which
Choose VoltAgent when observability console and their workflow APIs are the center of your agent stack.
Choose HazelJS Agent OS when durable agents must live beside production APIs with DNA, Skillgate, and crash-safe HITL in one Nest-familiar codebase.
Related
FAQ
- Is HazelJS a VoltAgent competitor?
- Yes for TypeScript agent teams, with a different wedge: HazelJS Agent OS emphasizes DNA packaging, Skillgate, Gatekeeper, and Nest-familiar HTTP/DI rather than a separate agent console platform.
- Can I use VoltAgent with HazelJS?
- You can call external libraries from HazelJS providers, but most Agent OS adopters consolidate on @hazeljs/agent to avoid dual runtimes.
- When should I pick VoltAgent?
- When VoltOps-style observability and their workflow APIs are central, and you do not need Nest-style modules plus DNA/Skillgate as the primary story.
- When should I pick HazelJS?
- When durable agents must live beside production REST with DNA, Skillgate, and crash-safe HITL in one TypeScript backend.
Docs & next steps
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