CVP reproduce

engineering.process.guard_band

Independent re-run pack: fixed input vectors, O3 expected values, oracle version, commands, and the last result summary. This is how a reader moves from “CalculatorX says it passed” to “I can reproduce why it passed.”

Reproduce JSON CVP Manifest O3 table Generator REST checker Calculator

Identity

Calculation version, protocol version, and evidence revision are distinct.

Calculation version: 1.0.0
CVP protocol: 1.0.0-proposed · proposed
Evidence revision: 2026-09-16.o2-o3
Oracle: O3 · mpmath 1.4.1 · 80 dps
Generator: guard-band-mpmath-o3 · seed 20260916.guard-band-o3
Table SHA-256: 23a7ca717d8afc723dd08eb89f4d46c1507d05ba93f0b07abaa5d50612f8f85d

Numerical claim

O3 PASS is a tabulated-vector claim, not a whole-domain proof.

O2: GB=k·u and optional acceptance limits vs separate-module identities (≤2 ULP). Not ILAC G8 risk, not Cp/Cpk, not Monte Carlo. ≤2 ULP vs O3 applies only to the published tabulated GB vectors (default k, explicit k, two-sided, USL-only, LSL-only, u=0). It is not a whole-domain guarantee and does not cover ILAC G8 risk or Cp/Cpk.

Last O3 run 8 / 8
Max error observed 0 ULP
Threshold ≤ 2 ULP

Commands

Regenerate the table from the public generator. Independent REST check needs only this page's reproduce.json plus stdlib Python — no repo clone and no mpmath. The CVP runner remains a maintainer command.

Regenerate O3 table: python3 generate-guard-band-o3.py after downloading the public generator next to the table
Repo maintainer path: python3 scripts/lib/cvp/oracles/generate-guard-band-o3.py
Independent REST check: Compare POST /api/v1/calc/guard-band against /developers/cvp/reproduce/guard-band-o3-tables.json after downloading check-math-o3-rest.py next to guard-band-o3-tables.json (or pass --reproduce reproduce.json)
Re-run CVP: npm run cvp:run -- --capability engineering.process.guard_band
REST check: POST https://www.calculatorx.com/api/v1/calc/guard-band with a tabulated input from the table below

Re-running the generator without changing seed or inputs should reproduce table SHA-256 23a7ca717d8afc723dd08eb89f4d46c1507d05ba93f0b07abaa5d50612f8f85d. Compare each expected_f64 to the production result within the declared ULP threshold.

Tabulated vectors

Every O3 vector used for the ≤2 ULP claim. Expected values come from the published mpmath table, not from the implementation under test.

ID	Kind	Inputs	Expected (f64)	Actual	Status
`o3-default`	default-k	`{"u":0.5}`	{"oracle_layer":"analytic","GB":1}	{"GB":1,"u":0.5,"k":2}	PASS
`o3-k2`	explicit-k	`{"u":0.5,"k":2}`	{"oracle_layer":"analytic","GB":1}	{"GB":1,"u":0.5,"k":2}	PASS
`o3-spec`	two-sided	`{"u":0.5,"k":2,"usl":12,"lsl":0}`	{"oracle_layer":"analytic","GB":1,"accept_usl":11,"accept_lsl":1}	{"GB":1,"u":0.5,"k":2,"accept_usl":11,"usl":12,"accept_lsl":1,"lsl":0}	PASS
`o3-usl`	usl-only	`{"u":0.5,"k":2,"usl":12}`	{"oracle_layer":"analytic","GB":1,"accept_usl":11}	{"GB":1,"u":0.5,"k":2,"accept_usl":11,"usl":12}	PASS
`o3-lsl`	lsl-only	`{"u":0.5,"k":2,"lsl":0}`	{"oracle_layer":"analytic","GB":1,"accept_lsl":1}	{"GB":1,"u":0.5,"k":2,"accept_lsl":1,"lsl":0}	PASS
`o3-k3`	explicit-k	`{"u":1,"k":3}`	{"oracle_layer":"analytic","GB":3}	{"GB":3,"u":1,"k":3}	PASS
`o3-zero-u`	two-sided	`{"u":0,"k":2,"usl":12,"lsl":0}`	{"oracle_layer":"analytic","GB":0,"accept_usl":12,"accept_lsl":0}	{"GB":0,"u":0,"k":2,"accept_usl":12,"usl":12,"accept_lsl":0,"lsl":0}	PASS
`o3-wide`	two-sided	`{"u":0.25,"k":2,"usl":10,"lsl":-10}`	{"oracle_layer":"analytic","GB":0.5,"accept_usl":9.5,"accept_lsl":-9.5}	{"GB":0.5,"u":0.25,"k":2,"accept_usl":9.5,"usl":10,"accept_lsl":-9.5,"lsl":-10}	PASS