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Swift framework to access Jev System One model by TypeSafe.ai
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- Updated Oct 2026
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CommunityJev Tools & CLIs
SwiftJev
Swift provider adapter that sends typed noul, choice, and score prompts to the hosted System One API through SwiftDecision DecisionBackend, returning validated probability distributions.
- Stars
- 9
- Language
- Swift
- License
- APACHE-2.0
- Published by
- Community
- Author
- SoundBlaster
- Last verified
- Oct 2026
About this project
SwiftJev is the TypeSafe Jev provider for SwiftDecision. It sends typed Noul, Choice, and Score prompts to the hosted System One API and returns validated probability distributions through SwiftDecision's DecisionBackend protocol. Add both products to the target that uses them: Set TYPESAFEAPIKEY or pass a key explicitly:
Quoted from the project's README. Read the full README.
Highlights
- Thin adapter design: SwiftJev owns provider and HTTP transport while SwiftDecision owns typed APIs, validation, fallback, timeouts, and traces.
- Validates every prompt and response, preserves option order, rejects redirects, checks cancellation, and keeps credentials and bodies out of errors.
- Injectable HTTP transport enables deterministic tests with no network at init; live benchmarks are opt-in because requests are billable.
- Classifies failures as transient or not without adding retry, letting callers decide fallback while a shared budget bounds total deadlines.
Watch out
Do not ship a shared provider key in an app binary; store a user-provided key in Keychain and pass it explicitly. 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.
You code against SwiftDecision engine calls while SwiftJev translates to Jev contracts and back, never exposing raw System One response models and keeping transport separate from policy.
Store a user-provided key in Keychain and pass it explicitly to the backend; the runbook warns against embedding a shared provider key inside the app binary.
Failures are classified without changing the error or adding recovery to predict, so timeouts, rate limits, and connectivity signals guide your retry or fallback, with a shared DecisionBudget for total deadlines.
HTTP transport is injectable for deterministic tests with no network at init, errors exclude credentials and bodies, and benchmarks never run in CI nor print prompts or credentials.
Swift 6.3 or later, with macOS 10.15+, iOS 15+, tvOS 13+ and watchOS 6+. It is Apache 2.0 licensed and added as a Swift package dependency alongside SwiftDecision.
SwiftJev returns the full distribution in prompt option order, and by default a response's choice label only has to name one of the prompt options, matching the TypeSafe API. Set maximumChoiceProbabilityGap (0.02 in the example, or 0 for strict argmax) to reject a choice that falls too far below the most probable option.
Pass the HTTPS API root, for example https://hub.coreinfra.ai/typesafe/api/v1, and SwiftJev appends /systemone. The proxy must accept the TypeSafe System One request and response contract. Keep keys in the environment or Keychain and never embed a shared key in an app binary.
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