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Ruby client for Jev, TypeSafe's System One model: typed questions, probabilistic answers. Zero runtime dependencies.
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CommunityJev Repos & SDKs
typesafe-jev (Ruby)
A zero-dependency Ruby client for Jev: ask typed Noul, Choice and Score questions about your application state and get frozen, typed answers with probabilities, confidence and token usage. Pure Net::HTTP and JSON, so it fits plain Ruby and Rails alike.
- Stars
- 1
- Language
- Ruby
- License
- MIT
- Reading time
- 2 min
- Published by
- Community
- Author
- dtheofr
- Last verified
- Oct 2026
Highlights
- Zero runtime dependencies — pure Ruby stdlib (Net::HTTP, JSON) — for Ruby 3.1 and newer, in plain Ruby and Rails alike.
- Three frozen question objects: Noul for a yes/no probability, Choice for an option plus its full distribution, Score for a level plus legend.
- Question ids are the hash keys you pass in and answers return under the same keys; invalid criteria raise ArgumentError at construction, before any HTTP call.
- Typesafe::Jev.evaluate is the one-shot facade pinned to jev-latest; use Typesafe::Client directly to call another model.
- Non-2xx responses raise typed errors carrying status, body, headers, request_id and a retryable? flag, all under Typesafe::APIError.
Quickstart
bash
gem install typesafe-jevWatch out
Grounded on the truncated README and GitHub metadata (Ruby, MIT, CI on GitHub Actions) read on 2026-10-15; the capture ends inside the error-class table, so the full list of status errors is not reproduced and key setup is not shown. The 0.95, 0.88 and 296-token figures in the quickstart are illustrative sample output, not benchmark results.
Questions about this entry
Short answers drawn from the linked project or page.
A Ruby client for Jev, TypeSafe's System One model: it asks natural-language questions about your application state and returns typed, probabilistic answers you can program against, with zero runtime dependencies.
gem install typesafe-jev, or add gem "typesafe-jev" to your Gemfile. It needs Ruby 3.1 or newer and works in plain Ruby and Rails alike because it only uses the standard library's Net::HTTP and JSON.
Typesafe::Noul for a yes/no probability with optional true/false criteria, Typesafe::Choice for one option out of non-empty key-description criteria with the full distribution, and Typesafe::Score for a level out of an ordered list plus legend.
response[id] returns a typed NoulAnswer, ChoiceAnswer or ScoreAnswer, with String and Symbol ids both working. Each exposes its own accessors — noul, choice, probabilities, confidence, score, legend — and serializes via to_h or to_json; responses are frozen.
Any non-2xx HTTP response raises a typed error under Typesafe::APIError (root Typesafe::Error) carrying status, body, headers, request_id and retryable?. Invalid questions fail earlier: bad criteria raise ArgumentError at construction time, before any HTTP call.
Typesafe::Jev.evaluate pins jev-latest. To use another model, call Typesafe::Client directly; the response reports the model that performed the evaluation, along with input and output token usage and the raw API shape via to_h or to_json.
It is a client for TypeSafe's hosted Jev model, so calls go to the TypeSafe API; the captured README covers the client surface — installation, questions, responses and errors — while its key configuration section sits outside the excerpt.
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