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Unofficial Go and Rust clients for the TypeSafe AI System One API (Jev)
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- 1
- Last pushed
- Updated Sep 2026
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CommunityJev Repos & SDKs
TypeSafe Client — haileyok
Unofficial Go and Rust clients for the System One API covering noul, choice and score questions, with env-based config, retries, typed errors and gateway support.
- Stars
- 7
- Language
- Rust
- License
- MIT
- Published by
- Community
- Author
- haileyok
- Last verified
- Oct 2026
About this project
Unofficial Go and Rust clients for the TypeSafe AI System One API. System One models, including TypeSafe's flagship model Jev, evaluate text or JSON state against named, typed questions and return structured answers instead of generated text: TypeSafe publishes official SDKs for Python and JavaScript/TypeScript. These clients bring the same behavior to Go and Rust: Typed questions and answers. Structured (JSON) instructions and criteria work, and Choice options keep the order you give them.
Quoted from the project's README. Read the full README.
Highlights
- Go client uses stdlib only and Rust client is async on reqwest, both reading TYPESAFE_API_KEY.
- Mirrors official retry policy with backoff, jitter and Retry-After handling.
- Reports typed errors with server messages and request IDs plus response validation.
- Supports GET /v1/models, gateway endpoints and credential-redacted logging.
Watch out
Unofficial clients not affiliated with TypeSafe AI; tune confidence thresholds on your own data before acting on answers. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
TypeSafe publishes official Python and JavaScript SDKs. These clients bring the same typed-question behavior, retries and validation to Go and Rust codebases.
No. Response validation uses dotted field paths and future answer types are passed through instead of breaking the response.
It mirrors the official retry policy for 408, 429, 5xx, connection failures and timeouts with backoff, jitter and Retry-After handling.
Yes. The digest advises using confidence to decide when to act, tuning thresholds on your own data and pinning a versioned model once you do.
The Go client is Go 1.22 or newer with no dependencies beyond the standard library, installed with go get github.com/haileyok/typesafe-client/go@latest even though the package itself is named typesafe. The Rust client is async on reqwest and needs Rust 1.88 or newer, installed with cargo add typesafe-system-one alongside tokio. Both read TYPESAFE_API_KEY.
One behavior contract for both clients covering configuration, headers, validation, decoding, errors, retries, and logging, plus a record of how disagreements between the docs, the OpenAPI spec, and the official SDKs were resolved. The clients are tested against spec/openapi.json, a snapshot of TypeSafe's published OpenAPI document at API v0.2.0.
Typed errors per status with the server's own message extracted, including FastAPI 422 field paths, and the x-typesafe-request-id attached to each one. Retries cover 408, 429, 5xx including 529 Overloaded, connection failures, and timeouts with exponential backoff and jitter; when the total budget runs out you get the last real error rather than a synthetic timeout.
Other listings of this project
Forks and copies of this project in the directory. This entry is the canonical one.
1GitHub stars
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Original write-ups on what this entry is for.
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