diff --git a/CMakeLists.txt b/CMakeLists.txt
index 65688c96..3cf9d109 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -508,6 +508,7 @@ if(RUN_CLANG_TIDY)
     set(CLANG_TIDY_LIB_CHECKS
         ${CLANG_TIDY_COMMON_CHECKS}
         "cppcoreguidelines-avoid-goto"
+        "cppcoreguidelines-avoid-magic-numbers"
         "cppcoreguidelines-non-private-member-variables-in-classes")
 
     # Skip some checks for tests because they're not worth the noise (e.g. GTest
diff --git a/src/api/game/game.cpp b/src/api/game/game.cpp
index 982b3c0f..455c408b 100644
--- a/src/api/game/game.cpp
+++ b/src/api/game/game.cpp
@@ -111,8 +111,10 @@ void Game::LoadPlugins(const std::vector<std::string>& plugins,
     uintmax_t fileSize = Plugin::GetFileSize(DataPath() / u8path(plugin));
 
     // Trim .ghost extension if present.
-    if (boost::iends_with(plugin, ".ghost"))
-      sizeMap.emplace(fileSize, plugin.substr(0, plugin.length() - 6));
+    if (boost::iends_with(plugin, GHOST_FILE_EXTENSION))
+      sizeMap.emplace(
+          fileSize,
+          plugin.substr(0, plugin.length() - GHOST_FILE_EXTENSION_LENGTH));
     else
       sizeMap.emplace(fileSize, plugin);
   }
diff --git a/src/api/helpers/text.cpp b/src/api/helpers/text.cpp
index a76800eb..792d3e18 100644
--- a/src/api/helpers/text.cpp
+++ b/src/api/helpers/text.cpp
@@ -81,11 +81,16 @@ std::string EscapeMarkdownASCIIPunctuation(const std::string& text) {
 std::vector<Tag> ExtractBashTags(const std::string& description) {
   std::vector<Tag> tags;
 
+  static constexpr const char* BASH_TAGS_OPENER = "{{BASH:";
+  static constexpr std::size_t BASH_TAGS_OPENER_LENGTH =
+      std::char_traits<char>::length(BASH_TAGS_OPENER);
+
   size_t startPos = description.find("{{BASH:");
-  if (startPos == std::string::npos || startPos + 7 >= description.length()) {
+  if (startPos == std::string::npos ||
+      startPos + BASH_TAGS_OPENER_LENGTH >= description.length()) {
     return tags;
   }
-  startPos += 7;
+  startPos += BASH_TAGS_OPENER_LENGTH;
 
   size_t endPos = description.find("}}", startPos);
   if (endPos == std::string::npos) {
diff --git a/src/api/helpers/text.h b/src/api/helpers/text.h
index 5db702f3..d8c1a0b9 100644
--- a/src/api/helpers/text.h
+++ b/src/api/helpers/text.h
@@ -32,6 +32,10 @@
 #include "loot/metadata/tag.h"
 
 namespace loot {
+static constexpr const char* GHOST_FILE_EXTENSION = ".ghost";
+static constexpr std::size_t GHOST_FILE_EXTENSION_LENGTH =
+    std::char_traits<char>::length(GHOST_FILE_EXTENSION);
+
 std::string EscapeMarkdownASCIIPunctuation(const std::string& text);
 
 std::vector<Tag> ExtractBashTags(const std::string& description);
diff --git a/src/api/metadata/plugin_metadata.cpp b/src/api/metadata/plugin_metadata.cpp
index 43925752..1fa705bb 100644
--- a/src/api/metadata/plugin_metadata.cpp
+++ b/src/api/metadata/plugin_metadata.cpp
@@ -45,8 +45,8 @@ PluginMetadata::PluginMetadata() {}
 
 PluginMetadata::PluginMetadata(const std::string& n) : name_(n) {
   // If the name passed ends in '.ghost', that should be trimmed.
-  if (boost::iends_with(name_, ".ghost")) {
-    name_ = name_.substr(0, name_.length() - 6);
+  if (boost::iends_with(name_, GHOST_FILE_EXTENSION)) {
+    name_ = name_.substr(0, name_.length() - GHOST_FILE_EXTENSION_LENGTH);
   }
 
   if (IsRegexPlugin()) {
diff --git a/src/api/plugin.cpp b/src/api/plugin.cpp
index 650c4112..46c8b8c3 100644
--- a/src/api/plugin.cpp
+++ b/src/api/plugin.cpp
@@ -51,7 +51,7 @@ Plugin::Plugin(const GameType gameType,
   try {
     // In case the plugin is ghosted.
     if (!std::filesystem::exists(pluginPath)) {
-      pluginPath += ".ghost";
+      pluginPath += GHOST_FILE_EXTENSION;
     }
 
     Load(pluginPath, gameType, headerOnly);
@@ -240,7 +240,7 @@ bool Plugin::IsValid(const GameType gameType,
 
     if (returnCode != ESP_OK || !isValid) {
       // Try adding .ghost extension.
-      auto ghostedFilename = pluginPath.u8string() + ".ghost";
+      auto ghostedFilename = pluginPath.u8string() + GHOST_FILE_EXTENSION;
       returnCode = esp_plugin_is_valid(
           GetEspluginGameId(gameType), ghostedFilename.c_str(), true, &isValid);
     }
@@ -261,7 +261,7 @@ bool Plugin::IsValid(const GameType gameType,
 
 uintmax_t Plugin::GetFileSize(std::filesystem::path pluginPath) {
   if (!std::filesystem::exists(pluginPath))
-    pluginPath += ".ghost";
+    pluginPath += GHOST_FILE_EXTENSION;
 
   return std::filesystem::file_size(pluginPath);
 }
@@ -423,8 +423,9 @@ unsigned int Plugin::GetEspluginGameId(GameType gameType) {
 }
 
 bool hasPluginFileExtension(std::string filename, GameType gameType) {
-  if (boost::iends_with(filename, ".ghost")) {
-    filename = filename.substr(0, filename.length() - 6);
+  if (boost::iends_with(filename, GHOST_FILE_EXTENSION)) {
+    filename =
+        filename.substr(0, filename.length() - GHOST_FILE_EXTENSION_LENGTH);
   }
 
   bool isEspOrEsm = boost::iends_with(filename, ".esp") ||
diff --git a/src/api/sorting/group_sort.cpp b/src/api/sorting/group_sort.cpp
index b60aace2..c46be246 100644
--- a/src/api/sorting/group_sort.cpp
+++ b/src/api/sorting/group_sort.cpp
@@ -251,7 +251,9 @@ std::vector<Vertex> GetGroupsPath(const std::vector<Group>& masterlistGroups,
   std::map<edge_t, int> weightMap;
   for (const auto& edge : boost::make_iterator_range(boost::edges(graph))) {
     if (graph[edge] == EdgeType::userLoadAfter) {
-      weightMap[edge] = -1000000;  // Magnitude is an arbitrarily large number.
+      // Magnitude is an arbitrarily large number.
+      static constexpr int USER_LOAD_AFTER_EDGE_WEIGHT = -1000000;
+      weightMap[edge] = USER_LOAD_AFTER_EDGE_WEIGHT;
     } else {
       weightMap[edge] = 1;
     }