A Roslyn analyzer that warns about every usage of the null-forgiving operator ! that is not justified by a comment, so everyone knows why it is needed. It works in any IDE and on CI.

dotnet add package Nullable.Extended.Analyzer

Justification comments

A justification comment is one or more single line comments directly above the statement or declaration. The first comment line must start with // ! , followed by the justification text:

// ! This is only needed to demo the feature
var text = value1!.ToString();

A code fix is offered that adds the scaffold for the comment.

Diagnostics

Id	Context
NX0001	Any other usage of the null-forgiving operator.
NX0002	Null-forgiving operator on the `null` or `default` literals at any other statement.
NX0003	Null-forgiving operator inside lambda expressions.
NX0004	Null-forgiving operator on the `null` or `default` literals at init only property assignment.

The severity of each category can be configured in your .editorconfig file:

[*.cs]
dotnet_diagnostic.NX0001.severity = error
dotnet_diagnostic.NX0003.severity = suggestion

See the project page for the Visual Studio extension, which also detects operators that are no longer needed, and for an MCP server that helps AI assistants to find and fix unjustified operators in large solutions.

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