jev-mcp

# Jev MCP

[](https://github.com/jkudish/jev-mcp/actions/workflows/ci.yml)
[](LICENSE)

Fast, cheap, typed judgments from TypeSafe's Jev model, as MCP tools.

Give your agent ten judgment tools:

- `jev_verify` checks claims against evidence.
- `jev_screen` judges content before it enters context.
- `jev_find` picks the best candidate by meaning.
- `jev_rerank` scores and sorts every candidate.
- `jev_classify` batch-assigns items to classes.
- `jev_decide` settles bounded alternatives.
- `jev_compare` judges how two passages relate.
- `jev_extract` pulls field values with regex plus judgment.
- `jev_review` scores a proposed diff before the task is called done.
- `jev_gate` reviews a patch and verifies completion claims in one call.

Each judgment comes back typed: probabilities, and for most tools a confidence score, in roughly 150 to 500 ms, for a fraction of a cent. The cheap mechanical checks agents otherwise skip, because a frontier model is too slow to run on every page, claim, or candidate list.

What you can use it for (the use cases are endless; these are just examples):

- Fact-check a report, PR description, or agent brief against the sources it cites, claim by claim.
- Screen a fetched page for injected instructions before it enters context, and skip pages with nothing to say.
- Find which document, file, or note answers a question, across hundreds of candidates, with no embeddings and no index to maintain.
- Rerank retrieval results, triage near-duplicates, or order a feed by relevance.
- Route support messages, label issues, or sort an inbox against your own label set, in batches.
- Choose between a handful of options with evidence and priorities in view, with an explicit ask-the-user escape hatch when it cannot decide.
- Reconcile a changelog against its