Question 1

Is this an official TypeSafe crate, and does it work with other vendors?

Accepted Answer

It is a port of TypeSafe AI's official Python SDK, not a crate they ship, and it deliberately has no vendor built in. There is no default base URL and no default model, so the API key only goes to the vendor you name, and any server speaking the System One endpoint plus the model listing can be used. The optional adapter crate goes the other way, asking those same questions of an OpenAI, Anthropic or Gemini model.

Question 2

What does turning on the sonic feature cost me?

Accepted Answer

It replaces serde_json with the SIMD sonic-rs for JSON, which carries unsafe and drops the sign of a literal -0.0. Because Cargo features are additive, enabling it anywhere in the graph selects sonic-rs for the SDK's own use as well as yours. Combining it with arbitrary_precision is the sharper edge, since a serde_json Number then gets written as an object such as a private Number wrapper, so check that path before turning both on.

Question 3

Could my key leak into a log line or a panic message?

Accepted Answer

Not through this SDK's own output: it writes the API key into no Debug, Display or error message, and redacts secret header values in its log events. Transport is hyper over rustls using the OS trust store, or the certificates named by SSL_CERT_FILE and SSL_CERT_DIR where those replace it. Client::from_env reads the key, base URL and optional default model from the environment, so it never has to be threaded through your call sites.

Question 4

What are the sharp edges when wiring this into an async service?

Accepted Answer

The runtime requirement first: every network operation is async on your Tokio runtime with the time driver enabled, or the first attempt's deadline panics. Second, under HttpVersion::Http2Only the connect runs in a task spawned on the runtime of the call that starts it, so a wrapper that only drives a current-thread runtime inside a block_on per call sees the connect progress only during calls. RawQuestion is also escape-hatch territory, since it applies only the checks the Python SDK applies to a raw dictionary.

Question 5

What does it actually call on the wire?

Accepted Answer

Two endpoints of the System One API: POST /v1/systemone, which answers named questions about a state, and GET /v1/models for the model listing. The separate adapter crate goes the other way, asking those same typed questions of an OpenAI, Anthropic or Gemini model rather than a decision model.

Question 6

How do I install it, and what is the minimum Rust version?

Accepted Answer

cargo add decision-model-sdk plus tokio with the macros and rt-multi-thread features, or the equivalent Cargo.toml entries. The minimum supported Rust version is 1.98 and the crate uses edition 2024. Client::from_env reads DECISION_MODEL_API_KEY and DECISION_MODEL_BASE_URL, with DECISION_MODEL_DEFAULT_MODEL optional, so none of them need threading through call sites.

Question 7

What retry behavior is baked in?

Accepted Answer

It matches the Python SDK's retry defaults, obeys a server Retry-After header, and runs the whole call under a 30 second budget. Each attempt carries its own deadline and retries sleep between attempts, which is exactly why the runtime must have the time driver enabled rather than only the network driver.

TypeSafe SDK Rust — zchee

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