OEP Update: Stop Events Now Include Structured Failure Context
January 18 2026
We've upgraded our evidence/verification pipeline's stop event reporting to include machine-readable failure context.
What Changed
Previously, stop events were minimal—a stop_code with details living elsewhere in logs or documentation. Now stop events can include:
- Expected vs Observed: Actual values that triggered the stop (e.g., expected 0, observed 2)
- Threshold: The tolerance that was exceeded (e.g., max allowed deviation)
- Provenance: A stable reference to the constraint source (e.g., profile and registry identifiers)
- Trace to Requirement: A stable requirement or policy reference ID
Why It Matters
For Quality Teams: Debug verification failures without reverse-engineering a stop_code list. The failure reason is in the artifact itself.
For Audit Trails: Machine-parseable stop context enables automated classification of failure modes across runs. No more manual log review to understand what violated which policy.
For Third-Party Labs: Verification failures are self-describing, reducing back-and-forth by providing the values and rule references that triggered rejection.
Tamper-Evidence Design
Canonical failure data is included in the receipt hash. Debug metadata like timestamps and operator notes are intentionally kept separate from receipt hashing, keeping the evidence spine clean while supporting human workflows.
Backward Compatibility
v0.1 stop events still verify; v0.2 is additive. Dispatch happens via schema_version in the stop event file, so existing bundles aren't broken.
What This Unlocks
- Policy automation: Tools can auto-classify failures by reading structured cause fields instead of parsing text logs
- Independent review: Deterministic, structured rejection context supports independent review workflows
- Debugging velocity: Root-cause analysis goes from "what does this stop_code mean?" to "here's the mismatch and which rule it violated"
Structured stop events ship with schema v0.2. All existing workflows continue working as-is.
Olexian Evidence Platform (OEP) provides deterministic verification for audit-oriented evidence artifacts. Evidence, not certification.
