Public evidence

engineering.conformity.decision_rule

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

Open calculator API Capability Download JSON MCP Review policy

Verification

11/11 calculation tests · Production surface contract 4/4

Golden tests 0 / 0
Boundary tests 7 / 7
Property tests 4 / 4
Production surface contract 4 / 4
Engine tested Yes
Source checked Yes
Artifact integrity PASS
Production attestation Embedded snapshot: STALE · Last attested schema matched 1.0.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status PASS (0 stale; 164 CURRENT) @ 2026-09-16T06:44:24.909Z
Semantic contract PASS
Evidence attested at 2026-09-16T06:44:24.203Z
Last production check 2026-09-16T06:44:24.203Z
Public / cache PASS
Origin PASS
Supplemental domain review Not performed
Named expert review Not performed

release artifacts aligned PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS

Fingerprint sha256:dda1f4f3da5ed844c325bd33de674cc6c85d2992a9c3029bc855f85508dd1436

Input schema sha256:6e053d4f5754cf3c234d51da7aa7576e548af6e3b61a8f427de166e422abe486 · Output schema sha256:22e442bce91f34d7848617f8a5d7f10c97fc577673d4dc8192be9d5d9f3e7ade · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: decision-rule
Engine: decision-rule
Engine build: 2026-09-15
Evidence core: 2026-09-15T08:55:02.198Z
Rendered: 2026-09-16T22:03:43.736Z
Last reviewed: —

Assumptions

ILAC G8-style binary simple (w=0) or guarded acceptance
Default rule is simple
Guarded w from w or already-expanded U; the band is fail
Not JCGM 106 risk tables, not TUR, and not GB = k·u as a product

Limitations

Binary pass/fail only — the guard-band zone is fail, not conditional
Does not compute ILAC G8 / JCGM 106 consumer or producer risk
Does not compute TUR or GB = k·u as a product (use those pages)
U or w is the already-stated band; this page does not expand u_c

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

ILAC G8:09/2019 — Guidelines on Decision Rules and Statements of Conformity — 6.2 Simple acceptance and 6.3 Guarded acceptance (binary)
Supports: Simple: accept if y is inside the specification. Guarded: accept if y is inside the acceptance interval; the band is not a pass
JCGM 106:2012 — The role of measurement uncertainty in conformity assessment — Risk-based and non-binary rules are a different contract
Supports: This page does not compute specific consumer/producer risk or a conditional third outcome

Published checks

Golden, boundary, and property cases included in this evidence build.

ID	Kind	Status	Detail
`boundary-dr-simple`	boundary	pass	Expected decision=pass · rule=simple · w=0 · Actual decision=pass · rule=simple · y=6 · w=0 · lsl=0 · usl=12 · accept_lsl=0 · accept_usl=12
`boundary-dr-simple-fail`	boundary	pass	Expected decision=fail · Actual decision=fail · rule=simple · y=12.1 · w=0 · lsl=0 · usl=12 · accept_lsl=0 · accept_usl=12
`boundary-dr-guarded`	boundary	pass	Expected decision=pass · w=1 · accept_lsl=1 · accept_usl=11 · Actual decision=pass · rule=guarded · y=6 · w=1 · lsl=0 · usl=12 · accept_lsl=1 · accept_usl=11
`boundary-dr-band`	boundary	pass	Expected decision=fail · Actual decision=fail · rule=guarded · y=0.5 · w=1 · lsl=0 · usl=12 · accept_lsl=1 · accept_usl=11
`boundary-dr-missing-y`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-dr-guarded-U`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-dr-empty`	boundary	pass	Expected INVALID_INPUT · Actual INVALID_INPUT
`property-dr-simple`	property	pass	pass
`property-dr-simple-fail`	property	pass	fail
`property-dr-guarded`	property	pass	pass
`property-dr-band`	property	pass	fail