TRLS016 — Error message should not be empty

• Severity: Warning
• Category: Trellis

What it detects

Flags empty or whitespace-only messages passed to Trellis error factory methods such as Error.Validation(...), Error.NotFound(...), Error.Conflict(...), Error.Unauthorized(...), Error.Forbidden(...), and Error.Unexpected(...).

Why it matters

Empty error messages make logs, diagnostics, and HTTP responses much harder to understand.

Warning

string.Empty, "", whitespace-only literals, and interpolated strings that contain only whitespace all trigger this rule.

Bad example

using Trellis;

static class Example
{
    public static Result<int> Bad(string quantity) =>
        Result.Failure<int>(Error.Validation("", nameof(quantity)));
}

Good example

using Trellis;

static class Example
{
    public static Result<int> Good(string quantity) =>
        Result.Failure<int>(Error.Validation("Quantity must be a whole number.", nameof(quantity)));
}

Code fix available

No.

Configuration

Use standard Roslyn configuration if you need to suppress this rule in a specific scope.

dotnet_diagnostic.TRLS016.severity = none

#pragma warning disable TRLS016
// Intentional: documented exception or test-only pattern.
#pragma warning restore TRLS016

Tip

Write the message for the next person who will debug the failure. A short, specific sentence is enough.