Public evidence

engineering.conformity.decision_rule

Machine-checked verification for calculation version 1.0.1 · tier engine_tested

Open calculator API Capability Download JSON CVP Manifest Reproduce MCP Review policy

CVP status

Not consumer risk. O3 tabulated vectors only.

Declared partition coverage: PASS · 7/7 declared partitions (alias, upper, guarded, fail, edge, pass, invalid-domain)
Versions: Calculation 1.0.1 · CVP protocol 1.0.0-proposed · Evidence 2026-09-25.o2-o3
Verification revision: 2026-09-25.o2-o3 · 1/1 property · digest 2681fed0d989

Verification

Legacy regression suite: 11/11 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (11/11 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-25.o2-o3. Calculation version 1.0.1. CVP 1.0.0-proposed. 4/4 golden · 6/6 CVP boundary · 5/5 invalid · 1/1 property · 1/1 metamorphic · 8/8 O3 · 2/2 cross-interface · 6/6 CVP contract. digest 2681fed0d989. O2: simple and guarded acceptance limits vs a separate-module identity (≤2 ULP). Not consumer risk. ≤2 ULP vs O3 applies only to the published tabulated decision-rule vectors. Not consumer risk.

Golden (oracle-backed) 4 / 4
CVP boundary 6 / 6
Invalid input 5 / 5
Property 1 / 1
Metamorphic 1 / 1
O3 high-precision 8 / 8
Cross-interface 2 / 2
CVP contract 6 / 6
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only.
Verified scope Simple and guarded acceptance of y against lsl and usl, + O3 mpmath tabulated decision limits.
Assurance Engineering
Deferred Not consumer risk and not an ILAC G8 guard-band width design.

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:b49e1a13301477c526273688105fbdab739ca8043f512de59818c44b3c6c54da

Input schema sha256:2f885ee0c51bad80b168b8d33a85f09ef246fbba92dbebb3181d700d012cbc10 · Output schema sha256:62130b2c75d1323b192384b792792b35107341b6e3b09b4d6ed13891a997e49f · 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: 2026-09-25
Evidence core: 2026-09-25T00:07:07.581Z
Rendered: 2026-10-23T01:27:11.172Z
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

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.