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🧭 Typed Go decision layer for the TypeSafe Jev and Cloudflare Clef System One APIs
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Go Discern
mrz1836's MIT-licensed typed Go decision layer for the TypeSafe Jev and Cloudflare Workers AI Clef System One APIs: choice, noul and score questions over text or JSON, with zero third-party runtime dependencies.
- Stars
- 1
- Language
- Go
- License
- MIT
- Reading time
- 2 min
- Published by
- Community
- Author
- mrz1836
- Last verified
- Oct 2026
- Languages
- Go
- Platforms
- Cloudflare
- Capabilities
- Open sourceRequires API key
Highlights
- Typed Go decision layer for TypeSafe Jev and Cloudflare Workers AI Clef, both System One APIs that return probabilities rather than text.
- Asks choice, noul and score questions; the quick-start routes a support ticket with per-option probabilities from jev-1.13.0.
- Requires Go 1.26 or newer and has zero third-party runtime dependencies: the core, both adapters and discerntest use only the standard library.
- A policy check accepts a decision only when every provider chose the same option and passed the threshold; the example demands AtLeast 0.80.
- Credentials are passed to jev.New and clef.New by your code; the library never reads environment variables or config files itself.
Watch out
MIT-licensed but days old (one star at check time), installed via go get with no stability promise on the API. Live use needs a TypeSafe API key and, for Clef, a Cloudflare account ID plus an API token; the quick-start makes one billable Jev call and JevAndClef makes two concurrent billable calls.
Questions about this entry
Short answers drawn from the linked project or page.
A small, typed Go library for asking classification or triage questions about text or JSON and getting probabilities from TypeSafe's Jev API, Cloudflare Workers AI's Clef models, or both at once, so a Go service can route on real probabilities with its own thresholds.
Two adapters: jev for TypeSafe's Jev API and clef for Cloudflare Workers AI Clef, registered through discern.New. Either can be used alone or both concurrently; every request must name its provider, JevOnly or JevAndClef.
go get github.com/mrz1836/go-discern, on Go 1.26 or newer. The example program reads TYPESAFE_API_KEY, CLOUDFLARE_ACCOUNT_ID and CLOUDFLARE_API_TOKEN, though any names work because the library never reads the environment.
The quick-start builds a Choice question with billing, technical and account options, calls ev.Evaluate with a 30-second timeout, and prints the chosen option plus every option's probability; the sample output picks billing at 0.99 from jev-1.13.0.
Your code passes them in: jev.New takes the TypeSafe key and clef.New takes the Cloudflare account ID and Workers AI token. go-discern never reads environment variables or configuration files itself, and jev.New returns ErrInvalidConfig for an empty key.
With both adapters registered and a default policy, a question is accepted only when both providers chose the same option and both passed the check; otherwise the recommendation is not accepted and the reasons are returned, with ErrPartialFailure marking the case where one provider still answered.
None at runtime: the core, both adapters and discerntest use only the Go standard library, and testify appears only in the tests and their internal helper package.
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