Can I self-host Jev?

No. TypeSafe serves Jev only through its own hosted API and through OpenRouter’s hosted endpoint for it; neither its docs nor its terms of service mention a self-hosted build, downloadable weights, or an on-premises option. TypeSafe’s terms define the product itself as “the TypeSafe-hosted web interface” and “the TypeSafe-hosted application programming interface,” and every version of the model is served from the same endpoint, POST /v1/systemone, selected by name in the request rather than installed anywhere. That matches how Tessary itself reaches Jev to run its frustration classifier: through a TypeSafe key or an OpenRouter key, never a model file. You still need to supply one of those keys yourself, because there’s nothing in Jev’s case to run locally instead.

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More on this.

Can Jev choose which tool an agent calls?Yes. TypeSafe's function-calling cookbook has Jev answer a single choice question listing every tool, returning a confidence with the pick, from 1.00 down to 0.53.answer →Can Jev replace an LLM judge for grading agent traces?Partly. Jev can take the narrow yes-or-no parts of a judge's rubric, but not a judgment that needs reasoning across a whole trace or a written reason for the verdict.answer →Does Jev beat a frontier LLM's accuracy on the same task?On TypeSafe's own benchmark, Jev averaged 67.8% accuracy at $0.0004 a case, beating Claude Opus 5 run as a single prompt (64.8% at $0.34).answer →Everything on jevThe definition, and every question answered under jev.concept →

Two ways to run Tessary.

Tessary is an open-source agent reliability platform. Cloud and self-hosted run the same workflow on the OpenTelemetry traces your agent already emits.

Tessary Cloud

We host it for you. Send your first trace with nothing to deploy and no model key.

what's includedper organization
traces
10,000 per calendar month
stored trace data
1 GB
retention
30 days
model credit
$10, one-time, for triage and root-cause analysis
credit card
not required
start for free

Self-hosted Tessary

Run the open-source code on your own infrastructure with one command. Add your own model key for triage and root-cause analysis.

Self-host Tessary for me by following https://github.com/tessaryai/tessary/blob/main/setup.md

docker compose -f oci://docker.io/tessaryai/tessary:compose up -d -y