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Unofficial Go SDK for TypeSafe AI's System One API (Jev).
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CommunityJev Repos & SDKs
TypeSafe Go — Shubham510
Unofficial, dependency-free Go client for TypeSafe's System One API. Calls Jev with Noul, Choice and Score questions in one request, returns typed answers and a typed error ladder, and mirrors the official Python and JavaScript SDKs' retry policy.
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- 0
- Language
- Go
- License
- MIT
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- Author
- Shubham510
- Last verified
- Oct 2026
This is one of several Jev listings for the same project. The canonical entry is TypeSafe Go — sd109.
About this project
An unofficial, community-maintained Go client for the TypeSafe AI System One API. TypeSafe currently publishes official Python and JavaScript SDKs; this package ports the same concepts to idiomatic Go so Go services can call Jev, TypeSafe's flagship System One model, without a Python/Node sidecar. This project is not affiliated with, endorsed by, or supported by TypeSafe AI. For official documentation, see docs.typesafe.ai. File issues against this repository, not TypeSafe's.
Quoted from the project's README. Read the full README.
Works forJev for Classification
Used inJev for Software & DevTools
- Languages
- Go
Highlights
- Zero third-party dependencies, built on net/http and encoding/json only, which the README argues makes it easy to vendor and audit.
- All three question types in a single System One call: Noul for yes/no, Choice over a criteria map, Score over an ordered rubric.
- Typed error ladder unwrapping to *APIError via errors.As, from *BadRequestError through *RateLimitError with a RetryAfter duration.
- DefaultRetryPolicy matches the official SDKs: 2 retries, backoff 500ms to 5s with 25% jitter, Retry-After honored, 30s budget.
Watch out
This is explicitly an unofficial client that is not affiliated with, endorsed by, or supported by TypeSafe AI, and the README says to file issues against this repository rather than TypeSafe's. It needs Go 1.27.1 or later, which Go's toolchain manager will fetch for you. Releases are git tags rather than registry uploads, so a version becomes available once the v-prefixed tag is pushed and pkg.go.dev indexes it. The README covers primitives, configuration, retries, the error ladder and model listing, but says nothing about what a call costs in tokens, whether the API returns rate-limit headers, or how ListModels paginates. 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.
The README's argument is about not needing a sidecar: TypeSafe publishes official Python and JavaScript SDKs, and this ports the same concepts to Go so a Go service can call Jev without a Python or Node process next to it. It is built on net/http and encoding/json with zero third-party dependencies, which the author argues keeps it easy to vendor and audit under strict dependency policies. It tracks the official SDKs' documented behavior, and the contributing guide asks you to link the doc page you matched if TypeSafe's API changes.
It is a documented match rather than a tested interop claim. DefaultRetryPolicy is described as 2 retries, exponential backoff from 500ms up to 5s with 25% jitter, retrying 408, 429, 5xx and connection or timeout errors, honoring Retry-After and retry-after-ms capped at 60s, inside a 30s total retry budget. You can override it per client or per call with WithRequestRetryPolicy. The README describes no test that runs identical traffic through both SDKs, so parity is by documentation, not measurement.
Yes. Instructions and Choice or Noul criteria accept structured JSON, not only strings, for cases where prose is ambiguous, and you construct the NoulQuestion, ChoiceQuestion and ScoreQuestion structs directly to do it. The README points at the advanced primitives doc for this rather than showing the struct fields itself, so the exact shape is not spelled out there. Ask several independent questions about the same State in one call and they run in parallel server-side, costing input tokens once.
The module's go directive is 1.27.1 or later, and Go's toolchain manager fetches it automatically if your local go is older. The client default is the jev-latest alias, overridable with TYPESAFE_DEFAULT_MODEL or WithDefaultModel; the examples show jev-preview as an alternative. The README does not list the dated model ids the client has been exercised against, so pinning one is on you.
Use go get github.com/Shubham510/[email protected], which requires Go 1.27.1 or later. NewClient reads TYPESAFE_API_KEY from the environment, then call client.SystemOne with a context and a SystemOneRequest holding State and Questions; read resp.Noul("is_urgent").Noul for the probability of yes.
Noul answers yes/no with NoulAnswer{Noul float64}, Choice picks one of a set and returns ChoiceAnswer with Choice, Probabilities, and Confidence, and Score rates along an ordered rubric and returns ScoreAnswer with Score, Legend, Probabilities, and Confidence. Ask several about the same state in one call; they run in parallel server-side and cost input tokens once.
Call client.ListModels(ctx) and iterate resp.Models, printing each m.Name, m.Description, and m.ReleaseDate. The examples directory also walks through combining all three question types, per-call retry overrides, error handling, and model listing.
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