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Latency-first Rust SDK for TypeSafe System One.
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- 1
- Last pushed
- Updated Sep 2026
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TypeSafe Rs
A community Rust client for Jev's System One API whose environment variables, defaults, retries, identification headers, and error kinds match the official Python and TypeScript SDKs.
- Stars
- 1
- Language
- Rust
- License
- MIT
- Reading time
- 3 min
- Published by
- Community
- Author
- AbdelStark
- Last verified
- Sep 2026
About this project
Rust client for TypeSafe System One. Evaluate a state against named questions (noul, choice, score) and get one typed answer per question. This is a community SDK. It is not an official TypeSafe product. Env vars, defaults, retries, identification headers, and error kinds match the official Python SDK and @typesafe-ai/sdk. MSRV is 1.85 (edition 2024). TLS is rustls by default (native-tls is available). state can be a string, a JSON object, or an array. Keys you pick on the question map come back on answers.
Quoted from the project's README. Read the full README.
Works forJev for Scoring
Used inJev for Software & DevTools
Highlights
- MSRV is 1.85 (edition 2024), TLS is rustls by default with native-tls optional, and blocking and mock crates are available behind features.
- Requests send X-TypeSafe-SDK, X-TypeSafe-Runtime, and a retry count header; API keys are redacted in Debug and errors omit the key and request body.
- Default retries match the official SDKs: 2 retries, 500 ms initial backoff, a 5 s cap, 25% jitter, and retry-after-ms then Retry-After capped at 60 s.
- RetryPolicy::conservative() retries only 408/429 and pre-send connection errors, because retrying 5xx on systemone can duplicate billable work.
- Questions are built with the questions! macro using Question::noul, choice, and score builders, and state can be a string, JSON object, or array.
Quickstart
rust
use typesafe_rs::{questions, Client, Question};
#[tokio::main]
async fn main() -> Result<(), typesafe_rs::Error> {
let client = Client::from_env()?;
let response = client.system_one("My payouts have been failing.", questions! {
"urgent" => Question::noul("Does this convey urgency?"),
"team" => Question::choice("Which team?").option("billing", "Refunds"),
}).await?;
println!("{:?}", response.noul("urgent"));
Ok(())
}Watch out
Dual-licensed Apache-2.0 or MIT and not an official TypeSafe product. Needs Rust 1.85+, a TYPESAFE_API_KEY, and an async runtime; the default timeout is 10 seconds per attempt including the body.
Questions about this entry
Short answers drawn from the linked project or page.
Parity is asserted, not measured. The README claims matching environment variables, defaults, retries, identification headers, and error kinds, and marks those behaviours as parity items in SPEC.md, exercised through JSON conformance fixtures. The crate also states outright that it is community work, not an official TypeSafe product.
They can. The README notes that retrying 5xx on the systemone POST can duplicate billable work, which is why RetryPolicy::conservative() exists: it retries only 408, 429, and pre-send connection errors, dropping 5xx and timeout retries. RetryPolicy::none() disables retries entirely.
Yes, for the documented cases. InvalidRequest covers client-side validation before any network call, including empty questions, Choice with fewer than two options, and Score with fewer than two levels. From the server side, an unrecognised answer type decodes to Answer::Unknown rather than failing the decode.
No. The README warns that constructing BlockingClient inside an existing Tokio runtime panics, because block_on cannot be nested. Use the async Client in runtime code and enable the blocking feature only in code paths that have no runtime.
typesafe-rs plus tokio's macros and rt-multi-thread features for the async client. Add the blocking feature for BlockingClient and typesafe-rs-mock as a dev-dependency for tests. MSRV is 1.85 on edition 2024, and TLS is rustls by default with native-tls available as an alternative.
Yes. typesafe-rs-mock is an in-process HTTP server that the real Client talks to over loopback rather than a stub of the SDK. You can script a 429 then a success, including retry-after-ms, and mock.journal() records method, path, headers, JSON body and timestamps so you can assert retry-count headers and attempt order.
Every request sends Authorization: Bearer, Accept: application/json, User-Agent typesafe-rs/<version>, X-TypeSafe-SDK, X-TypeSafe-Runtime with the Rust and OS details, and X-TypeSafe-Retry-Count starting at 1 on retries only. Those identification headers cannot be overridden, and API keys are redacted in Debug while errors never include the key or request body.
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