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Unofficial Swift SDK for TypeSafe
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- Updated Oct 2026
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Swift TypeSafe
Unofficial Swift 6.4 client for TypeSafe's System One API, following the Python SDK 0.7.0 API with @QuestionSet property wrappers for typed Noul, Choice and Score questions.
- Stars
- 17
- Language
- Swift
- License
- MIT
- Reading time
- 3 min
- Published by
- Community
- Author
- ainame
- Last verified
- Sep 2026
About this project
Swift 6.4 SDK for TypeSafe AI, following the Python SDK's 0.7.2 API. Supports macOS 26+, iOS 26+, tvOS 26+, watchOS 26+, visionOS 26+, and Linux. Uses Apple's experimental HTTPClient package, pinned to 0.2.1. The proposal may change; its Swift 6.4 and OS requirements apply to this SDK. Add swift-typesafe to your Swift package dependencies: Add the TypeSafe product to your target: Set TYPESAFEAPIKEY or pass apiKey to TypeSafeClient, then choose the question style that fits your application.
Quoted from the project's README. Read the full README.
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Highlights
- Declares questions with @QuestionSet, @Choice, @Noul and @Score; the declaration is a schema passed as a type.
- Supports macOS 26+, iOS 26+, tvOS 26+, watchOS 26+, visionOS 26+ and Linux on Swift 6.4.
- Follows Python SDK retry behavior: two retries by default for connection errors, timeouts and HTTP 408/429/5xx.
- Uses Apple's experimental HTTPClient package pinned to 0.2.1, whose proposal may still change.
- Tests use Swift Testing with Python 3 loopback servers and need no API key.
Watch out
MIT-licensed. Requires Swift 6.4 and the newest Apple OS releases; it depends on Apple's experimental HTTPClient 0.2.1 and is not affiliated with TypeSafe AI.
Questions about this entry
Short answers drawn from the linked project or page.
It needs Swift 6.4 and macOS 26+, iOS 26+, tvOS 26+, watchOS 26+ and visionOS 26+, or Linux. Underneath it depends on Apple's experimental HTTPClient package pinned to 0.2.1, and the README warns that the proposal may still change, so that package's own Swift and OS requirements apply to you. Most teams are a couple of major versions behind that.
Credential headers are redacted, and authentication, identification and retry headers are protected from caller overrides. But debug logging includes request and response bodies, which are not redacted, so debug level will print your state to wherever your swift-log backend sends it. Logging is off by default and set through an injected Logger or TYPESAFE_LOG_LEVEL.
They follow the Python SDK: two retries by default for connection errors, timeouts and HTTP 408, 429 and 5xx, exponential backoff from 0.5 to 5 seconds with subtractive jitter, and retry-after-ms plus Retry-After support. A per-call policy replaces the client policy, a predicate can opt extra errors in, and the budget stops scheduling an attempt whose delay would reach it without cutting off one already running.
MAJOR.MINOR follows Python, so Python 0.8.0 becomes Swift 0.8.0 and can carry breaking changes. Patch numbers are owned by this package and need not match Python's, so a Swift patch number says nothing about the upstream patch. While the SDK is 0.x, from: "0.7.3" resolves new minors too, so pin with .upToNextMinor if you want to stay on one Python API generation.
Add the package URL in your Swift package dependencies and the TypeSafe product to your target, then set TYPESAFE_API_KEY or pass apiKey to TypeSafeClient. It targets macOS 26+, iOS 26+, tvOS 26+, watchOS 26+, visionOS 26+ and Linux, and follows the Python SDK's 0.7.2 API.
Three. A @QuestionSet struct declares reusable typed questions with concrete typed answers. A result-builder closure builds ad-hoc questions local to one call and returns answers in declaration order. The dynamic API takes questions built at runtime and returns answers by name. All three send choice, noul and score primitives.
Defaults are https://api.typesafe.ai, model jev-latest and a 10-second timeout per attempt. Explicit configuration takes precedence over TYPESAFE_API_KEY, TYPESAFE_BASE_URL and TYPESAFE_DEFAULT_MODEL, and blank environment values are ignored. Retries default to two for connection errors, timeouts and HTTP 408, 429 and 5xx responses.
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