diff --git a/pkg/analyzer_utilities/pubspec.yaml b/pkg/analyzer_utilities/pubspec.yaml
index 336134a7a3b..67d33616b09 100644
--- a/pkg/analyzer_utilities/pubspec.yaml
+++ b/pkg/analyzer_utilities/pubspec.yaml
@@ -21,6 +21,5 @@ dependencies:
 
 # Use 'any' constraints here; we get our versions from the DEPS file.
 dev_dependencies:
-  analyzer_plugin: any
   lints: any
   test_reflective_loader: any
diff --git a/pkg/analyzer_utilities/tool/messages/switch_to_camel_case.dart b/pkg/analyzer_utilities/tool/messages/switch_to_camel_case.dart
deleted file mode 100644
index f5cb13fa744..00000000000
--- a/pkg/analyzer_utilities/tool/messages/switch_to_camel_case.dart
+++ /dev/null
@@ -1,88 +0,0 @@
-// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-/// This is a temporary utility script that modifies error codes in
-/// `messages.yaml` files, changing analyzer error codes from UPPER_SNAKE_CASE
-/// to camelCase.
-library;
-
-import 'dart:io';
-
-import 'package:analyzer_plugin/protocol/protocol_common.dart';
-import 'package:analyzer_utilities/analyzer_messages.dart';
-import 'package:analyzer_utilities/extensions/string.dart';
-import 'package:analyzer_utilities/lint_messages.dart';
-import 'package:analyzer_utilities/messages.dart';
-import 'package:collection/collection.dart';
-import 'package:source_span/source_span.dart';
-import 'package:yaml/yaml.dart';
-
-void main() {
-  Map<Uri, Converter> converters = {};
-  for (var message in [
-    ...analyzerMessages,
-    ...analysisServerMessages,
-    ...feAnalyzerSharedMessages,
-    ...lintMessages,
-    ...frontEndMessages,
-  ]) {
-    var sourceUrl = message.keySpan.sourceUrl;
-    (converters[sourceUrl!] ??= Converter(
-      File(sourceUrl.toFilePath()),
-    )).convertMessage(message);
-  }
-  for (var converter in converters.values) {
-    converter.apply();
-  }
-}
-
-class Converter {
-  final File file;
-  late final isAnalyzerFormat = switch (Uri.file(file.path).pathSegments) {
-    [..., '_fe_analyzer_shared', 'messages.yaml'] => false,
-    [..., 'analyzer', 'messages.yaml'] => true,
-    [..., 'analysis_server', 'messages.yaml'] => true,
-    [..., 'linter', 'messages.yaml'] => true,
-    _ => throw 'Unexpected path ${file.path}',
-  };
-  late final String content = file.readAsStringSync();
-  late final yaml = loadYamlNode(content) as YamlMap;
-  late final messageMaps = isAnalyzerFormat ? yaml.nodes.values : [yaml];
-  late final Map<String, YamlMap> messageNodesByName = {
-    for (var messageMap in messageMaps)
-      for (var MapEntry(:key, :value) in (messageMap as YamlMap).nodes.entries)
-        (key as YamlScalar).value as String: value as YamlMap,
-  };
-  final List<SourceEdit> edits = [];
-
-  Converter(this.file);
-
-  void apply() {
-    edits.sortBy((e) => -e.offset);
-    file.writeAsStringSync(SourceEdit.applySequence(content, edits));
-  }
-
-  void convertMessage(Message message) {
-    if (message is AnalyzerMessage && !message.keyString.isCamelCase) {
-      _edit(message.keySpan, message.keyString.toCamelCase());
-    } else if (message is CfeStyleMessage) {
-      _edit(message.keySpan, message.keyString.toSnakeCase().toCamelCase());
-    }
-    if (message is SharedMessage) {
-      var messageNode = yaml.nodes[message.keyString] as YamlMap;
-      _edit(
-        messageNode.nodes['analyzerCode']!.span,
-        message.analyzerCode.camelCaseName,
-      );
-    }
-    if (message.sharedName case var sharedName?) {
-      var messageNode = messageNodesByName[message.keyString] as YamlMap;
-      _edit(messageNode.nodes['sharedName']!.span, sharedName.camelCaseName);
-    }
-  }
-
-  void _edit(SourceSpan span, String newText) {
-    edits.add(SourceEdit(span.start.offset, span.length, newText));
-  }
-}