Unified Confidence Score (UCS)

Unified Confidence Score (UCS)

The Unified Confidence Score is a single numeric value between 0.0 and 1.0 representing Nomotic's overall confidence that an agent action should be permitted. Every governance decision produces a UCS. It is the primary signal used to determine verdict.

How It's Calculated

UCS is a weighted average of scores across all 14 governance dimensions. Each dimension scores independently from 0.0 to 1.0.

UCS = Σ (dimension_score × dimension_weight) / Σ weights

Dimensions with higher weights have more influence on the final score. Weights are set by the active preset and can be overridden per-agent in nomotic.yaml.

Thresholds and Verdicts

UCS Range	Typical Verdict
0.80 – 1.0	ALLOW
0.60 – 0.79	ALLOW or MODIFY
0.40 – 0.59	ESCALATE
0.0 – 0.39	DENY

Thresholds are configurable per preset. The ultra_strict preset uses a higher allow threshold than standard.

Veto Overrides

[!warning]

A veto dimension scoring 0.0 results in immediate DENY regardless of UCS. A high UCS does not protect against a veto.

Reading UCS in Output

nomotic test my-agent --action write

Verdict:  ALLOW
UCS:      0.847
Tier:     1 (fast gate)

Programmatic Access

verdict = runtime.evaluate(action, context)
print(f"UCS: {verdict.ucs:.3f}")
print(f"Verdict: {verdict.verdict}")

# Individual dimension scores
for score in verdict.dimension_scores:
    print(f"  {score.dimension_name}: {score.score:.3f}")

Related

• 14 Dimensions

• Three-Tier Evaluation

• Compliance Presets

• Verdicts