Source: https://guthlabs.ai/docs/instruments/truss-determinacy-checker/implementation/

instrument implementation / implementation-contract

# Truss Determinacy Checker implementation

A source-bound implementation contract for Truss Determinacy Checker; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-142

**Effect**: Computation or source lookup only

## Input and validation requirements

The classifier has no division-by-zero operation, but extreme counts overflow JavaScript arithmetic and produce an infinite degree. More importantly, the meaning of r is convention-sensitive: counting supports instead of scalar reaction components can change the computed reaction count and classification unless the support model is explicitly defined.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "m": 3,
    "r": 3,
    "j": 3
  },
  "expected_outputs": {
    "classification": "determinate",
    "degree_of_indeterminacy": 0
  },
  "working": "m+r = 3+3 = 6. 2j = 2×3 = 6. Since 6 = 6, classification = determinate. Degree = (m+r)−2j = 6−6 = 0."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/truss-determinacy-checker/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/truss-determinacy-checker/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/truss-determinacy-checker/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`