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Hexel
What Hexel is
Hexel is a governed runtime for production AI agent fleets, placed between agents and the systems they act on. Before an action runs, it checks that action against policy: permitted actions proceed, while risky ones can pause for human approval, with decisions logged. Rules can allow, deny, or require approval based on actions, resources, and context. Hexel offers Serverless, Fluid, and Dedicated execution planes for different capacity and isolation needs; it says agents can move between them with a configuration change. The service records plans, decisions, and tool calls as trace graphs, supports run replay, and attributes compute spend by fleet, task, and team. Its decision audit log is described as immutable and able to stream to a SIEM in real time. Hexel lists integrations across agent frameworks and tools including LangChain, LlamaIndex, CrewAI, OpenAI, Kubernetes, Python, and TypeScript. It says data is encrypted in transit with TLS 1.2+ and at rest with AES-256, and credentials are held in an isolated vault. A free tier is available; paid tiers use metered or custom annual pricing.
Who it suits
Hexel may suit teams deploying AI agent fleets that need policy controls, audit trails, and visibility into runs and compute spend. Its Scale tier is described for high-throughput, multi-team deployments, and Enterprise for regulated, mission-critical fleets.
What it does well
- Actions can pause for human approval.
- Rules can allow, deny, or require approval.
- Run traces support replay and spend attribution.
- Three execution planes serve different capacity needs.
- Free tier is available.
What to know first
- Scale pricing is usage-metered and not listed.
- Enterprise uses custom annual pricing.
- ISO 27001 and HIPAA-ready are marked in progress.
- Free usage is metered in Hexel Fleet Units.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Start free; set budgets; usage metered in Hexel Fleet Units | Free |
| Scale | Usage metered; annual billing available with a discount · Unlimited fleets · Serverless, Fluid, and Dedicated planes · Volume HFU pricing · SSO and advanced RBAC · Priority support · 90-day trace retention | On request |
| Enterprise | Custom annual · Everything in Scale · Private/VPC isolation · Custom audit and SIEM streaming · Dedicated SLA · Solutions engineering · Unlimited retention | On request |
As hexelstudio.com lists them, read 7 Oct 2026. The maker's own page has the final word.
Verdict
Hexel combines pre-execution policy checks with traces, run replay, and several execution planes. Teams should review the tier’s retention and support terms: Scale lists 90-day trace retention, while Enterprise lists unlimited retention and a dedicated SLA.
Facts from Hexel's own pages
- Audit
- Hexel describes its decision audit log as immutable and says it can stream to a SIEM in real time. · hexelstudio.com, 7 Oct 2026
- Compliance
- The security page lists SOC 2 Type II and GDPR, and marks ISO 27001 and HIPAA-ready as in progress. · hexelstudio.com, 7 Oct 2026
- Credentials
- Hexel says credentials and keys are stored in an isolated vault and are never exposed to agents. · hexelstudio.com, 7 Oct 2026
- Execution planes
- The Serverless plane scales to zero, Fluid provides warm capacity for sustained throughput, and Dedicated provides isolated capacity for compliance, performance predictability, and data residency. · hexelstudio.com, 7 Oct 2026
- Founded
- 2024 · hexelstudio.com, 28 Sept 2026
- Governance
- Hexel evaluates agent actions against policy before execution; safe actions proceed, risky actions can pause for human approval, and decisions are logged. · hexelstudio.com, 7 Oct 2026
- Integrations
- The home page lists LangChain, LlamaIndex, CrewAI, AutoGen, OpenAI, Anthropic, Vercel AI, Pydantic AI, Temporal, Kubernetes, Python, and TypeScript as part of the agent stack it works with. · hexelstudio.com, 7 Oct 2026
- Intended users
- The Scale tier is described for high-throughput, multi-team deployments, and Enterprise for regulated, mission-critical fleets. · hexelstudio.com, 7 Oct 2026
- Observability
- Hexel records plans, decisions, and tool calls as trace graphs, attributes compute spend by fleet, task, and team, and supports replay of runs. · hexelstudio.com, 7 Oct 2026
- Policy engine
- Policy rules can allow, deny, or require approval based on actions, resources, and context. · hexelstudio.com, 7 Oct 2026
- Portability
- Hexel says the same agent can run across its execution planes and move between them with a configuration change. · hexelstudio.com, 7 Oct 2026
- Product
- Hexel describes itself as a governed runtime for production AI agent fleets, positioned between agents and the systems they act on. · hexelstudio.com, 7 Oct 2026
- Security
- Hexel says data is encrypted in transit with TLS 1.2+ and at rest with AES-256 across every plane. · hexelstudio.com, 7 Oct 2026
- Support
- Scale includes priority support, while Enterprise includes solutions engineering and a dedicated SLA. · hexelstudio.com, 7 Oct 2026
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