# Missing Fallback for Unavailable Information

## Ontology Metadata

Code: ISS-0074
Version: ISS-0074@0.1.0
Ontology release: 0.1.0
Updated: 2026-05-10T00:00:00Z
Canonical URL: /workbench/issues/missing-fallback-for-unavailable-information/

## Summary

The task does not declare what the AI should do when required information, sources, tools, fields, or evidence are unavailable.

## Category

- CAT-0120 — Coverage & Guidance
  - URL: /workbench/categories/coverage-and-guidance/
  - Summary: Problems where prompts, rubrics, diagnostics, fallback rules, examples, requirements, or relationship maps are incomplete, underspecified, or missing needed guidance.

## Primary Pattern

- PAT-0130 — Incomplete Declaration
  - URL: /workbench/patterns/incomplete-declaration/
  - Summary: A structural condition where an element is declared but required attributes, dependencies, or linked definitions are missing.

## Declared Patterns

- PAT-0130 — Incomplete Declaration
  - URL: /workbench/patterns/incomplete-declaration/
  - Summary: A structural condition where an element is declared but required attributes, dependencies, or linked definitions are missing.
- PAT-0120 — Missing Authority
  - URL: /workbench/patterns/missing-authority/
  - Summary: A structural condition where a region, action, state, or decision path exists without a declared governing authority.
- PAT-0170 — Constraints Underspecified
  - URL: /workbench/patterns/constraints-underspecified/
  - Summary: A structural condition where declared constraints are insufficient to eliminate ambiguity or multiple admissible states.

## Derived Primary Lenses

- LEN-0100 — Absence Lens
  - URL: /workbench/lenses/absence-lens/
  - Summary: Detects structurally required elements that are missing from the observed structure.
- LEN-0110 — Authority Overlay Lens
  - URL: /workbench/lenses/authority-overlay-lens/
  - Summary: Maps declared authority hierarchies onto observed structure to detect absence, override, or conflict.
- LEN-0160 — Constraint Sufficiency Lens
  - URL: /workbench/lenses/constraint-sufficiency-lens/
  - Summary: Evaluates whether declared constraints are sufficient to eliminate structural degrees of freedom.

## Derived Secondary Lenses

- LEN-0150 — Conflict Lens
  - URL: /workbench/lenses/conflict-lens/
  - Summary: Detects mutually incompatible constraints, claims, states, or declarations that cannot be simultaneously satisfied.
- LEN-0180 — Determinism Lens
  - URL: /workbench/lenses/determinism-lens/
  - Summary: Evaluates whether identical structural inputs produce equivalent structural outputs across repeated executions.
- LEN-0200 — Interface Contract Lens
  - URL: /workbench/lenses/interface-contract-lens/
  - Summary: Compares declared interface structure to observed runtime structure to detect contract deviations.
- 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-0290 — Variance / Entropy Lens
  - URL: /workbench/lenses/variance-entropy-lens/
  - Summary: Measures structural variability across repeated or comparable evaluations and identifies divergence beyond expected bounds.

## Search Intents

- missing fallback for unavailable information
- AI does not know what to do when information missing
- no fallback when source unavailable
- missing information fallback
- AI guesses when information unavailable
- no rule for unavailable evidence