HazelJS
Open-source Agent OS for TypeScript that helps teams operate AI agents like production systems
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Open-source Agent OS for TypeScript with durable runtime, governance, and local-first deployment for production AI agents.
About HazelJS
HazelJS is an open-source Agent OS for TypeScript that enables teams to build, deploy, and operate AI agents as production systems. Unlike traditional frameworks, HazelJS provides durable execution with agents that survive restarts, built-in governance through Gatekeeper authorization and Skillgate capabilities, and Agent DNA for versioning agents as packages.
The platform is designed as a local-first system where agents run in the same TypeScript backend as your APIs. It includes five core layers: Define (version identity and policies), Run (agent runtime and VM), Decide (bounded judgment before effects), Govern (capability authorization), and Survive (durable runs and crash-safe human-in-the-loop).
Built on Apache 2.0 open source, HazelJS works without requiring cloud services or Kubernetes. It includes Meridian, a flagship example application that demonstrates the full Agent OS pattern. The platform is actively used in production, including by Zynli, a multi-tenant AI support product built on the HazelJS stack.
- typescript
- open-source
- production
- ai agents
- durable runtime
Features worth knowing
- Durable execution with crash-safe HITL
- Agent DNA for versioning agents as packages
- Gatekeeper default-deny authorization
- Skillgate capability curation
- Local-first deployment without Kubernetes requirement
- Agent VM with effect typing and speculation
- Decision Runtime for bounded closed-set judgment
- Organism for multi-agent coordination
Pricing
Pricing model: Open source
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HazelJS metrics
| Metric | Value |
|---|---|
| Domain Rating | 7 no change since last check |
| Trust Flow | 3 no change since last check |
| Citation Flow | 23 no change since last check |
| Referring domains | 18 no change since last check |
| External backlinks | 262 no change since last check |
Ahrefs Domain Rating scanned 10 Nov 2026, updated 9 Nov 2026. Main topic: Computers/Programming/Languages (3). Majestic scanned 9 Nov 2026, updated 9 Nov 2026. Link stats via Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
HazelJS domain facts
Reveal the domain facts
| Domain age | 7 months |
|---|---|
| Registered | |
| Expires | |
| Registrar | GoDaddy.com, LLC |
| DNSSEC | Not signed |
HazelJS launch results
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 7 to 7 no change since launch 9 Nov 2026, then 10 Nov 2026 |
| Trust Flow (Majestic) | 3 first measured 9 Nov 2026 |
| Referring domains (Majestic) | 18 first measured 9 Nov 2026 |
Day 1 since launch. Next receipt: day 30, 9 Dec 2026. The figures report a change; they do not say what caused it, and many things can. No figure here is a guess.
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FAQ
- What is an Agent OS?
- An Agent OS keeps agents alive in production with durable runs, governance, and local-first TypeScript. It provides five layers: Define (version identity and policies as DNA), Run (agent runtime and VM), Decide (bounded judgment before effects), Govern (capability authorization), and Survive (durable runs and crash-safe human-in-the-loop). Unlike frameworks that help you build agents, an Agent OS helps you operate them as production systems.
- Can HazelJS run without cloud infrastructure?
- Yes. HazelJS is local-first — hazel apply runs on your laptop, and cloud and Kubernetes are optional. Local Store is enough to start, with hosted registry as an optional Team SKU for sharing packages.
- What is Meridian?
- Meridian is the flagship HazelJS example repository that teaches DNA vs tools, Store vs platform vs run, Skillgate, router, and HITL. It can be cloned and used as a pattern template for building your own products on the HazelJS stack.
- Is HazelJS used in production?
- Yes. Zynli, a multi-tenant AI support product with RAG, flows, billing, and real-time handoff, is built on the HazelJS stack and runs in production, demonstrating that HazelJS packages ship real products.
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