Show HN: Jevper – an LLM API client constrained to the Jev wire format

Category: ai-ml

Tags: llm, api-client, structured-output, decision-making, python

Score: 6.0/10 (Innovation: 6, Technical: 6, Documentation: 7, Utility: 5)

jevper is an independent Python client that implements OpenAI's Decisions API schema and the Jev wire format, allowing structured decision queries (predicate, choice, score) over any OpenAI-compatible model. It abstracts over multiple backends (Chat Completions, Responses, Messages) and elicitation methods (logprobs, grammar, structured JSON) to produce typed, probabilistic answers, with a focus on portability and future-proofing against hosted endpoints.

Target audience: AI/ML engineers and backend developers integrating LLM-based decision systems

Repository: https://github.com/zhulinchng/jevper · Python · Apache-2.0 · 19 stars

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