# Output Changed Without Declared Change

## Ontology Metadata

Code: ISS-0059
Version: ISS-0059@0.1.0
Ontology release: 0.1.0
Updated: 2026-05-10T00:00:00Z
Canonical URL: /workbench/issues/output-changed-without-declared-change/

## Summary

Output shape, content, format, fields, or behavior changes without a declared change to the prompt, schema, model, workflow, or governing rule.

## Category

- CAT-0080 — Changes & Versions
  - URL: /workbench/categories/changes-and-versions/
  - Summary: Problems where model behavior, prompts, contracts, schemas, outputs, references, rubrics, or expectations change without the surrounding workflow updating correctly.

## Primary Pattern

- PAT-0380 — Silent Mutation
  - URL: /workbench/patterns/silent-mutation/
  - Summary: A structural condition where a change occurs without a corresponding declared update, authority update, or version change.

## Declared Patterns

- PAT-0380 — Silent Mutation
  - URL: /workbench/patterns/silent-mutation/
  - Summary: A structural condition where a change occurs without a corresponding declared update, authority update, or version change.
- PAT-0190 — Contract Drift
  - URL: /workbench/patterns/contract-drift/
  - Summary: A structural condition where a declared contract changes but connected structures, implementations, consumers, or expectations do not update in sync.
- PAT-0180 — Compatibility Violation
  - URL: /workbench/patterns/compatibility-violation/
  - Summary: A structural condition where a graph, object, behavior, or runtime state exceeds a declared compatibility envelope without an authorized exception.

## Derived Primary Lenses

- LEN-0130 — Compatibility Envelope Lens
  - URL: /workbench/lenses/compatibility-envelope-lens/
  - Summary: Determines whether structure fits within declared runtime, platform, version, or support constraints.
- LEN-0170 — Convergence Lens
  - URL: /workbench/lenses/convergence-lens/
  - Summary: Compares parallel structural systems to determine whether they align under shared authority.
- LEN-0180 — Determinism Lens
  - URL: /workbench/lenses/determinism-lens/
  - Summary: Evaluates whether identical structural inputs produce equivalent structural outputs across repeated executions.
- LEN-0270 — Reconciliation Lens
  - URL: /workbench/lenses/reconciliation-lens/
  - Summary: Evaluates whether structural changes align with declared authority updates, version changes, or reconciliation rules.
- LEN-0280 — Reference Stability Lens
  - URL: /workbench/lenses/reference-stability-lens/
  - Summary: Evaluates whether structural references, identifiers, nodes, and edges remain consistent across execution cycles or comparable states.

## Derived Secondary Lenses

- LEN-0120 — Boundary Compliance Lens
  - URL: /workbench/lenses/boundary-compliance-lens/
  - Summary: Evaluates observed structure against declared boundary posture, including allow, block, and exception rules.
- LEN-0260 — Provenance Trace Lens
  - URL: /workbench/lenses/provenance-trace-lens/
  - Summary: Attaches stable lineage to structural regions by mapping origin, reference history, and transformation path.

## Search Intents

- output changed without declared change
- AI output changed without update
- output format changed silently
- structured output changed no version change
- AI response changed unexpectedly
- output changed but prompt did not