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Ruby client for decision models such as Typesafe Jev
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- Updated Oct 2026
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Jev directory
CommunityJev Repos & SDKs
Ruby Decision Model
A Ruby client for Noul, Choice, and Score decision models, reaching OpenRouter by default or TypeSafe's native API, with no runtime dependencies beyond the standard library.
- Stars
- 58
- Language
- Ruby
- License
- MIT
- Reading time
- 3 min
- Published by
- Community
- Author
- obie
- Last verified
- Sep 2026
About this project
The decision-model interface for Ruby. Decision models answer typed questions about a state with calibrated probabilities instead of generating text. This gem talks to them through one Client with a provider behind it. OpenRouter is the default. Typesafe (Jev), OpenAI (gpt-6-luna), Cloudflare (Clef), Perplexity (pplx-decider), and Databricks (aidecide) each have a native provider, and any server that speaks the System One API (Ollama, strands-decider, the autojev server) works through :systemone. Your questions…
Quoted from the project's README. Read the full README.
Works forJev for Scoring
Used inJev for Software & DevTools
Highlights
- One Client with a provider behind it: OpenRouter by default (typesafe/jev-1.13) and TypeSafe's native API as the second door (jev-latest).
- Client.new reads the environment: TYPESAFE_API_KEY selects Typesafe, otherwise OPENROUTER_API_KEY; with neither it raises ConfigurationError.
- Questions.noul, Questions.choice with up to 255 options, and Questions.score with 2 to 10 levels; answers come back typed with probabilities.
- RetryPolicy follows the official SDKs: max_retries 2, 0.5 s initial backoff that doubles, a 5 s ceiling, and 25% jitter.
- Typesafe responses expose the x-typesafe-request-id header as response.request_id; status 0.1.0, so the API may change.
Watch out
MIT-licensed and stdlib-only, but version 0.1.0 with an API that may change; needs Ruby and either a TYPESAFE_API_KEY or an OPENROUTER_API_KEY.
Questions about this entry
Short answers drawn from the linked project or page.
A community gem. It talks to the OpenRouter decisions endpoint by default and to the Typesafe native API as a second door, with no runtime dependencies beyond the standard library. Status is 0.1.0 and the README says the API may change, so pin the version rather than floating on latest.
No. Client.new with no arguments reads the environment: TYPESAFE_API_KEY selects Typesafe, otherwise OPENROUTER_API_KEY selects OpenRouter, and with neither set it raises ConfigurationError naming both. You can also pass provider: explicitly, or hand it a custom Providers::Base subclass when the wire format differs.
RetryPolicy follows the official Typesafe SDKs: 2 retries after the first attempt, 0.5 s initial backoff doubling each time, a 5 s ceiling and 25% jitter, honoring Retry-After up to 60 s. It retries 408, 429, 5xx, connection errors and timeouts, with a 30 s total budget that stops it before another attempt starts. An attempt already in flight still runs to its own timeout.
For Choice they sum to roughly 1 and the README says to treat them as calibrated rather than normalized. Score answers carry probabilities keyed by the wire string level keys such as 0 and 1, not by your criteria labels, so the returned legend maps them back to your rubric. No local calibration step is described anywhere in the README.
Add gem "ruby_decision_model" to your Gemfile and require "ruby_decision_model". OpenRouter is the default; pass provider: :typesafe, :openai, :cloudflare, :perplexity, :databricks, or :system_one to Client.new, along with api_key:, model:, or base_url: as needed. It has no runtime dependencies beyond the Ruby standard library.
Yes, through the :system_one provider, which speaks TypeSafe's API at /v1/systemone. Anything serving that endpoint works, including Ollama 0.35+, the autojev server, and strands-decider's local server, with base_url given without the /v1 suffix plus its http:// or https://. The API key and model are optional; without a key no Authorization header is sent.
The default read timeout is 5 seconds for Typesafe, OpenRouter, and Cloudflare, whose models answer well under a second, and 30 seconds for OpenAI, Perplexity, Databricks, and System One servers because of slow large inputs or first-request model loading. Connecting gets 5 seconds either way; a number passed as timeout: sets both.
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