JuliusBrussee/caveman · error

marshal session-value artifact: %w

Error message

marshal session-value artifact: %w

What it means

ComputeSessionValueArtifactHash failed to JSON-marshal the session-value policy artifact while computing its canonical hash (the ArtifactHash field is zeroed first so the hash is self-consistent). Marshal failures here indicate non-serializable field types (NaN/Inf floats are the usual cause), not bad input data from callers.

Source

Thrown at proxy/routing/session_value.go:148

}

type SessionValuePrediction struct {
	ActionID                string
	RewardProbability       float64
	QualityLCB              float64
	ExpectedResidualCostUSD float64
	ExpectedCostUSD         float64
	CostUCBUSD              float64
	ExpectedCorrectiveTurns float64
	EscalationProbability   float64
	QualityUncertainty      float64
}

func ComputeSessionValueArtifactHash(artifact SessionValuePolicyArtifact) (string, error) {
	artifact.ArtifactHash = ""
	raw, err := json.Marshal(artifact)
	if err != nil {
		return "", fmt.Errorf("marshal session-value artifact: %w", err)
	}
	sum := sha256.Sum256(raw)
	return "sha256:" + hex.EncodeToString(sum[:]), nil
}

func SealSessionValueArtifact(artifact SessionValuePolicyArtifact) (SessionValuePolicyArtifact, error) {
	hash, err := ComputeSessionValueArtifactHash(artifact)
	if err != nil {
		return SessionValuePolicyArtifact{}, err
	}
	artifact.ArtifactHash = hash
	return artifact, nil
}

func ValidateSessionValueArtifact(artifact SessionValuePolicyArtifact, organizationID, projectID, candidatePoolHash string, now time.Time) error {
	if artifact.Schema != SessionValueArtifactSchema || artifact.StateSchemaVersion != SessionValueStateSchema {
		return errors.New("session-value artifact schema mismatch")
	}

View on GitHub (pinned to 766dce6b13)

Solutions

1. Ensure all numeric fields of the artifact are finite (no NaN or +Inf) before sealing
2. Fix the artifact-producing pipeline if it can emit non-serializable values

When it happens

Trigger: Thrown at proxy/routing/session_value.go:148 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of JuliusBrussee/caveman@766dce6b13 (2026-08-18). Data as JSON: /api/errors/b438fec331278fd5. Report an issue: GitHub.