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MCP server for typed decisions with Jev / System One via OpenRouter or TypeSafe
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- Updated Sep 2026
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CommunityJev Agents & MCP
Jev MCP — freepik-company
Go MCP server exposing Jev through OpenRouter or TypeSafe as five tools: decide, classify, verify, rerank and list_models. Each tool call is one paid inference request, answers are validated against the question asked, and the unchanged provider response is returned with its usage cost.
- Stars
- 3
- Language
- Go
- License
- APACHE-2.0
- Published by
- Community
- Author
- freepik-company
- Last verified
- Oct 2026
This is one of several Jev listings for the same project. The canonical entry is Jev MCP — jkudish.
About this project
A small, dependency-light MCP server that gives any MCP client typed, probabilistic decisions from Jev, TypeSafe's System One model, through OpenRouter or TypeSafe directly.
Quoted from the project's README. Read the full README.
Used inJev for Software & DevTools
- Languages
- Go
Highlights
- Five tools over one call: decide, classify, verify, rerank and list_models, with one paid inference request per tool invocation.
- Choice, noul and score questions are answered in a single parallel pass, and the model cannot return an option you did not supply.
- Provider answers are validated against the question sent, so inconsistent or incomplete answers fail the call instead of being repaired.
- Credentials stay in the server environment, HTTPS is enforced, and a paid call is never retried automatically.
Watch out
Cost scales with how many items and questions you batch into a call rather than with the number of results, since every tool invocation is one billable request. Paid calls are not retried, requests time out at 30 seconds, and inputs and responses are capped at 1 MiB and 2 MiB. Verification is a model judgment over the evidence you supply, not a proof or approval, and no acceptance threshold is imposed on it. Provider error bodies are never surfaced, which hides the detail you would need to debug a rejected key. Independent project, not affiliated with TypeSafe or OpenRouter. Copy reviewed against the repository README on 2026-10-04, not from running it.
Questions about this entry
Short answers drawn from the linked project or page.
It adds a process, not a second bill. The same System One request goes out either way, and the cost is one inference call per tool invocation regardless of how many items or questions that call carries. What you are buying is the batching discipline, answer validation and a dependency-light Go binary you can drop on PATH, install with the Go toolchain, or run from a published container image.
The answer is validated against the question you sent. Unknown input fields, and provider answers that are incomplete or inconsistent with the question, fail the call instead of being quietly fixed up. The unchanged provider response, including usage.cost when the provider supplies it, is always returned, so you can audit exactly what came back.
Yes, that is the default: set OPENROUTER_API_KEY and the model resolves to jev-latest. Set JEV_PROVIDER=typesafe with TYPESAFE_API_KEY to go straight to TypeSafe, or API_KEY to override whichever provider is selected. BASE_URL must be HTTPS, with plain HTTP accepted only on loopback for local proxies and tests.
Because a retry is a second bill and you cannot tell whether the first attempt landed. Requests time out at 30 seconds, sizes are bounded, and provider errors surface only their HTTP status, never the response body, so a credential echoed back by a provider cannot reach the model. Re-issue the call yourself once you have decided it is worth the money.
Five: decide takes shared state and named questions; classify assigns categories to items; verify labels claims supported, contradicted or insufficient_evidence; rerank scores candidates on a 0-4 rubric; and list_models lists compatible ids without running inference.
Install a release binary (Linux, macOS or Windows, amd64 or arm64), pull ghcr.io/freepik-company/jev-mcp:latest, or run go install. It speaks MCP over stdio and reads the key from its environment, so register it with claude mcp add jev -e OPENROUTER_API_KEY=... -- jev-mcp or a JSON client block.
Requests have a 30-second timeout, a 1 MiB input limit and a 2 MiB response limit. Unknown input fields and incomplete or inconsistent answers fail the call, provider errors surface only their HTTP status without the response body, and paid calls are not automatically retried.
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Posts from builders shipping with Jev right now.