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Unofficial async Rust client for the TypeSafe System One API (Jev)
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- Updated Sep 2026
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TypeSafe Systemone
An unofficial async Rust client for the TypeSafe System One API, mirroring the shape of the official Python and JavaScript SDKs. It builds noul, choice and score questions with a fluent builder and returns calibrated probabilities.
- Stars
- 0
- Language
- Rust
- License
- APACHE-2.0
- Reading time
- 2 min
- Published by
- Community
- Author
- 2commits
- Last verified
- Oct 2026
Used inJev for Software & DevTools
Highlights
- Fluent builder for field, noul, choice and score questions sent in a single request.
- Responses expose probabilities, confidence and ranked options; choices support none_of_the_above.
- Retries 408, 429 and 5xx twice with backoff and jitter, and honours retry-after headers.
- Defaults: model jev-latest, base URL api.typesafe.ai, 30 s timeout, TYPESAFE_API_KEY from the environment.
- Unofficial, MIT OR Apache-2.0, mirrors the official Python and JavaScript SDK contracts.
Watch out
README and GitHub metadata reviewed 2026-10-17; the digest truncates the ranked() usage sample. The client is explicitly unofficial, and the README's limits (64k tokens, 255 options) are quoted from TypeSafe's docs rather than re-verified here.
Questions about this entry
Short answers drawn from the linked project or page.
An unofficial async Rust client for the TypeSafe System One API. Jev evaluates a state against typed questions and returns calibrated probabilities rather than generated text, and the crate mirrors the official Python and JavaScript SDK shapes.
The fluent builder covers all three primitives: noul for yes-probability questions, choice over up to 255 options with option and none_of_the_above helpers, and score over ordered rubric levels, sent together in one request.
Add typesafe-systemone = "0.1" to your Cargo dependencies; Client::from_env reads TYPESAFE_API_KEY, and request builders chain field, noul, choice and score calls before a single .send().await.
Errors mirror the official SDKs: authentication, permission, not found, bad request, rate limit, overloaded, server, connection, timeout and response validation. 408, 429 and 5xx are retried per the default two-retry policy with backoff and jitter.
Yes. The builder accepts api_key, model, base_url and timeout settings; TYPESAFE_DEFAULT_MODEL defaults to jev-latest and TYPESAFE_BASE_URL to api.typesafe.ai. Explicit builder values win over environment variables.
From TypeSafe's docs: 64k tokens per request for state plus all questions, 32k for state plus the longest question, and 255 options per choice. The README adds that accuracy degrades as unrelated state material grows.
No. The README calls it an unofficial client that follows the public API contract at docs.typesafe.ai/api. It was created on 2026-09-20 with a single push the next day, has 0 stars and is MIT or Apache-2.0 dual licensed.
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