PromptPlus

|Adr-Plus Fields|Values Migrated | |–|–| |ADR|Predicate semantics for validation and filtering| |Version|01| |Revision|01| |Scope|| |Domain|| |Created|Proposed (2026-07-24)| |Changed|Accepted (2026-07-24)| |Superseded||

# PromptPlus ## **ADR0010V01R01** [](https://www.nuget.org/packages/PromptPlus) [](https://opensource.org/licenses/MIT) [](https://dotnet.microsoft.com/)

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ADR0010V01R01 — Predicate semantics for validation and filtering

Context

Controls accept user predicates for validation and item filtering. Inconsistent boolean meaning (does true mean “valid” or “reject”?) is a frequent source of bugs.

Decision

Standardize predicate meaning across all controls:

• Validation predicate returns true when the input is valid.
• Filter predicate returns true when the item should be shown.

true always means “keep / accept”. No control inverts this.

Consequences

• Positive: one rule to remember for every predicate; fewer inverted-logic bugs.
• Negative / trade-off: users migrating from libraries with the opposite convention must adapt; the rule is documented per control to prevent surprises.

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