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JEV core — the judgement primitive and harness for TypeSafe System One (Jev). Closed-set, fail-open, stdlib-only.
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JEV core
A standard-library-only judgement primitive and harness for Jev: ask N items × K typed questions in bounded, fail-open requests, and consume answers through a closed boundary in code that refuses anything outside the set you enumerate.
- Stars
- 1
- Language
- Python
- Reading time
- 3 min
- Published by
- Community
- Author
- litshing
- Last verified
- Oct 2026
Highlights
- The harness refuses any answer outside the enumerated set — the raw value is kept for audit, answer becomes None — and snapshots each consumed state.
- Fails open: nothing raises, and a question it cannot validate is refused, not trusted; CJK input is gated as the vendor documents lower non-English accuracy.
- Three CLI subcommands: ask (one state × K questions), score (N items × K questions, batched) and calibrate (derive a threshold from labelled scores).
- Answer types: noul is a float in [0,1], score an int index into criteria, choice a criteria key; noul(answers, name) returns None for missing or NaN values.
- Standard library only, with no virtualenv or dependencies; the key resolves from TYPESAFE_API_KEY or ~/.hermes/.env and is never printed, logged or written.
Quickstart
json
{
"is_stale": {
"type": "noul",
"instructions": "Is this line obviously obsolete and safe to discard?",
"criteria": {"true": "clearly obsolete", "false": "still useful"}
}
}Watch out
Copy reviewed against the truncated README on 2026-10-15; the use section cuts off after the answer-types paragraph. GitHub metadata lists no license, the consumers/ directory is not populated yet, and the usage-envelope spec the README references was not included in the digest.
Questions about this entry
Short answers drawn from the linked project or page.
A judgement primitive for TypeSafe System One that asks N items × K typed questions in bounded, cheap, fail-open requests, plus the JEV harness — the closed boundary in code that makes a Jev answer safe to consume. It is standard library only.
It refuses answers outside the set you enumerate (keeping the raw value for audit with answer=None), snapshots the consumed state as a state_fingerprint, marks every answer verified=False, gates CJK before sending, and fails open — nothing raises.
Because the harness never verifies: the README says your code must. A question the harness cannot validate is refused rather than trusted, so a caller never has to trust the wire.
Three subcommands: ask (one state × K questions), score (N items × K questions, batched) and calibrate (derive a threshold from labelled scores). Unlike the library, bin/jev is a shim that puts its own checkout on sys.path.
Clone the repository to a location like ~/jev-platform, symlink bin/jev into ~/.local/bin, and run jev --help. There is no virtualenv or dependency install: it is standard library only, and the checkout may live anywhere because bin/jev derives its root from its own location.
noul returns a float in [0,1], score an int index into criteria, and choice one of the criteria keys. noul(answers, name) returns None for anything missing, non-numeric or NaN, so a caller never has to trust the wire.
TYPESAFE_API_KEY resolves from the environment, else from the TYPESAFE_API_KEY= line of ~/.hermes/.env. It is never printed, logged or written to disk — only whether it exists is ever reported — and --dry-run and --show-state do not read it at all.
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