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Unofficial portable Clojure SDK for TypeSafe System One
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CloJev
Unofficial portable Clojure SDK for TypeSafe System One. It posts state and typed questions to /v1/systemone, lists available models, and returns validated Clojure data with keyword or string answer keys, on a JVM backend or a native Jolt backend.
- Stars
- 1
- Language
- Clojure
- License
- APACHE-2.0
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- Last verified
- Oct 2026
About this project
CloJev is an independent Clojure SDK for the TypeSafe System One API. CloJev sends state and typed questions to POST /v1/systemone. It also lists available models through GET /v1/models. It returns validated Clojure data. Noul, Choice, and Score question constructors. A default JVM backend based on java.net.http.HttpClient. A native Jolt backend based on jolt-lang/http-client. A portable .cljc core with replaceable transport and platform protocols. See the API reference for all public functions and data shapes.
Quoted from the project's README. Read the full README.
Used inJev for Software & DevTools
- Platforms
- API
- Capabilities
- Open sourceRequires API key
Highlights
- Ships Noul, Choice and Score question constructors plus authenticated model discovery via GET /v1/models.
- Retries with exponential backoff and jitter, honors Retry-After, and normalizes API and transport errors.
- Portable .cljc core with swappable Transport and Platform protocols; JVM and Jolt backends included.
- JVM tests run against a local HTTP server with six property-based fuzz tests of 1,000 cases each, no API key needed.
Watch out
Apache-2.0. It is an independent project that TypeSafe does not sponsor or support, and the author advises reviewing API behavior before production use.
Questions about this entry
Short answers drawn from the linked project or page.
Clojure 1.12+ on Java 11+ for the JVM backend, and Jolt 0.8.9+ with OpenSSL for HTTPS on the native backend; the portable core targets any runtime that supplies the two protocols.
Set TYPESAFE_API_KEY in the environment, or pass :api-key when creating a client; explicit client options take precedence over environment variables.
A map with :model, :answers and :usage. Each answer carries its type: a Noul gives :noul, a Choice gives :choice plus :probabilities per candidate and :confidence, and a Score gives :score plus the full :legend and :probabilities keyed by level index. Usage comes back as :input-tokens and :output-tokens. Your question identifier is preserved, so a keyword key gives a keyword answer key and a string key gives a string one.
Retries use exponential backoff with jitter, honor Retry-After, and cover statuses 408, 429, 500, 502, 503, 504 and 529. You set :max-retries, :backoff-initial-ms, :backoff-max-ms, :backoff-jitter and a total :budget-ms, which is 30000 by default; setting it to nil removes the overall retry budget. Single calls can override the model, timeout, extra headers and retry block.
Add the dependency to deps.edn pointing at the GitHub repository on the main branch. For a reproducible build, replace :git/branch with :git/sha pinned to a release commit. The Jolt backend also needs io.github.jolt-lang/time and jolt-lang/http-client pinned by SHA.
clojev/list-models hits the authenticated GET /v1/models endpoint and returns each entry's name, description and release date, such as jev-latest. It accepts per-call :timeout-ms, :retry and :extra-headers options, and TYPESAFE_DEFAULT_MODEL and TYPESAFE_BASE_URL set the defaults when you create a client.
Unofficial: the README states TypeSafe does not develop, sponsor, endorse or support it, and the names are used only to identify the compatible API. The JVM client accepts a :request-fn that performs one attempt and returns status, headers and body, and any backend implementing clojev.transport/Transport can be passed as :transport. Do not retry inside a custom backend, since CloJev applies its retry policy after each attempt. It also owns the Authorization, Accept, Content-Type and User-Agent headers.
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