diff --git a/crates/ruff_linter/src/rules/flake8_bandit/rules/suspicious_function_call.rs b/crates/ruff_linter/src/rules/flake8_bandit/rules/suspicious_function_call.rs
index 4e2a1dc35c..fed37def9a 100644
--- a/crates/ruff_linter/src/rules/flake8_bandit/rules/suspicious_function_call.rs
+++ b/crates/ruff_linter/src/rules/flake8_bandit/rules/suspicious_function_call.rs
@@ -1091,9 +1091,12 @@ fn suspicious_function(
         ] => checker.report_diagnostic_if_enabled(SuspiciousInsecureCipherModeUsage, range),
 
         // Mktemp
-        ["tempfile", "mktemp"] => {
-            checker.report_diagnostic_if_enabled(SuspiciousMktempUsage, range)
-        }
+        ["tempfile", "mktemp"] => checker
+            .report_diagnostic_if_enabled(SuspiciousMktempUsage, range)
+            .map(|mut diagnostic| {
+                diagnostic.add_primary_tag(ruff_db::diagnostic::DiagnosticTag::Deprecated);
+                diagnostic
+            }),
 
         // Eval
         ["" | "builtins", "eval"] => {
diff --git a/crates/ruff_linter/src/rules/flake8_pyi/rules/bytestring_usage.rs b/crates/ruff_linter/src/rules/flake8_pyi/rules/bytestring_usage.rs
index 264d650548..59d9173860 100644
--- a/crates/ruff_linter/src/rules/flake8_pyi/rules/bytestring_usage.rs
+++ b/crates/ruff_linter/src/rules/flake8_pyi/rules/bytestring_usage.rs
@@ -74,7 +74,8 @@ pub(crate) fn bytestring_attribute(checker: &Checker, attribute: &Expr) {
         ["collections", "abc", "ByteString"] => ByteStringOrigin::CollectionsAbc,
         _ => return,
     };
-    checker.report_diagnostic(ByteStringUsage { origin }, attribute.range());
+    let mut diagnostic = checker.report_diagnostic(ByteStringUsage { origin }, attribute.range());
+    diagnostic.add_primary_tag(ruff_db::diagnostic::DiagnosticTag::Deprecated);
 }
 
 /// PYI057
@@ -94,7 +95,9 @@ pub(crate) fn bytestring_import(checker: &Checker, import_from: &ast::StmtImport
 
     for name in names {
         if name.name.as_str() == "ByteString" {
-            checker.report_diagnostic(ByteStringUsage { origin }, name.range());
+            let mut diagnostic =
+                checker.report_diagnostic(ByteStringUsage { origin }, name.range());
+            diagnostic.add_primary_tag(ruff_db::diagnostic::DiagnosticTag::Deprecated);
         }
     }
 }
diff --git a/crates/ruff_linter/src/rules/flake8_pytest_style/rules/fixture.rs b/crates/ruff_linter/src/rules/flake8_pytest_style/rules/fixture.rs
index 128b3b06e3..6c0558636c 100644
--- a/crates/ruff_linter/src/rules/flake8_pytest_style/rules/fixture.rs
+++ b/crates/ruff_linter/src/rules/flake8_pytest_style/rules/fixture.rs
@@ -898,7 +898,9 @@ fn check_test_function_args(checker: &Checker, parameters: &Parameters, decorato
 /// PT020
 fn check_fixture_decorator_name(checker: &Checker, decorator: &Decorator) {
     if is_pytest_yield_fixture(decorator, checker.semantic()) {
-        checker.report_diagnostic(PytestDeprecatedYieldFixture, decorator.range());
+        let mut diagnostic =
+            checker.report_diagnostic(PytestDeprecatedYieldFixture, decorator.range());
+        diagnostic.add_primary_tag(ruff_db::diagnostic::DiagnosticTag::Deprecated);
     }
 }
 
diff --git a/crates/ruff_linter/src/rules/flake8_unused_arguments/rules/unused_arguments.rs b/crates/ruff_linter/src/rules/flake8_unused_arguments/rules/unused_arguments.rs
index fb0ea5a004..2aff59aa32 100644
--- a/crates/ruff_linter/src/rules/flake8_unused_arguments/rules/unused_arguments.rs
+++ b/crates/ruff_linter/src/rules/flake8_unused_arguments/rules/unused_arguments.rs
@@ -223,7 +223,7 @@ enum Argumentable {
 
 impl Argumentable {
     fn check_for(self, checker: &Checker, name: String, range: TextRange) {
-        match self {
+        let mut diagnostic = match self {
             Self::Function => checker.report_diagnostic(UnusedFunctionArgument { name }, range),
             Self::Method => checker.report_diagnostic(UnusedMethodArgument { name }, range),
             Self::ClassMethod => {
@@ -234,6 +234,7 @@ impl Argumentable {
             }
             Self::Lambda => checker.report_diagnostic(UnusedLambdaArgument { name }, range),
         };
+        diagnostic.add_primary_tag(ruff_db::diagnostic::DiagnosticTag::Unnecessary);
     }
 
     const fn rule_code(self) -> Rule {
diff --git a/crates/ruff_linter/src/rules/numpy/rules/deprecated_function.rs b/crates/ruff_linter/src/rules/numpy/rules/deprecated_function.rs
index b34f4b917d..1cbae5066d 100644
--- a/crates/ruff_linter/src/rules/numpy/rules/deprecated_function.rs
+++ b/crates/ruff_linter/src/rules/numpy/rules/deprecated_function.rs
@@ -80,6 +80,7 @@ pub(crate) fn deprecated_function(checker: &Checker, expr: &Expr) {
             },
             expr.range(),
         );
+        diagnostic.add_primary_tag(ruff_db::diagnostic::DiagnosticTag::Deprecated);
         diagnostic.try_set_fix(|| {
             let (import_edit, binding) = checker.importer().get_or_import_symbol(
                 &ImportRequest::import_from("numpy", replacement),
diff --git a/crates/ruff_linter/src/rules/numpy/rules/deprecated_type_alias.rs b/crates/ruff_linter/src/rules/numpy/rules/deprecated_type_alias.rs
index daa445642a..60967e12b4 100644
--- a/crates/ruff_linter/src/rules/numpy/rules/deprecated_type_alias.rs
+++ b/crates/ruff_linter/src/rules/numpy/rules/deprecated_type_alias.rs
@@ -80,6 +80,7 @@ pub(crate) fn deprecated_type_alias(checker: &Checker, expr: &Expr) {
             },
             expr.range(),
         );
+        diagnostic.add_primary_tag(ruff_db::diagnostic::DiagnosticTag::Deprecated);
         let type_name = match type_name {
             "unicode" => "str",
             _ => type_name,