diff --git a/Flow.Launcher.Infrastructure/IAlphabet.cs b/Flow.Launcher.Infrastructure/IAlphabet.cs
index e79ec0c6d..65ee07b24 100644
--- a/Flow.Launcher.Infrastructure/IAlphabet.cs
+++ b/Flow.Launcher.Infrastructure/IAlphabet.cs
@@ -1,4 +1,4 @@
-namespace Flow.Launcher.Infrastructure
+namespace Flow.Launcher.Infrastructure
 {
     /// <summary>
     /// Translate a language to English letters using a given rule.
@@ -9,14 +9,22 @@
         /// Translate a string to English letters, using a given rule.
         /// </summary>
         /// <param name="stringToTranslate">String to translate.</param>
-        /// <returns></returns>
+        /// <summary>
+/// Translates the input string into English letters according to the implementing alphabet's rules.
+/// </summary>
+/// <param name="stringToTranslate">The string to be translated.</param>
+/// <returns>A tuple containing the translated string and a <see cref="TranslationMapping"/> representing the mapping details.</returns>
         public (string translation, TranslationMapping map) Translate(string stringToTranslate);
 
         /// <summary>
         /// Determine if a string can be translated to English letter with this Alphabet.
         /// </summary>
         /// <param name="stringToTranslate">String to translate.</param>
-        /// <returns></returns>
+        /// <summary>
+/// Determines whether the specified string is eligible for translation to English letters using this alphabet's rules.
+/// </summary>
+/// <param name="stringToTranslate">The input string to evaluate for translation eligibility.</param>
+/// <returns>True if the string should be translated; otherwise, false.</returns>
         public bool ShouldTranslate(string stringToTranslate);
     }
 }
diff --git a/Flow.Launcher.Infrastructure/PinyinAlphabet.cs b/Flow.Launcher.Infrastructure/PinyinAlphabet.cs
index 37b7bb8c3..c82d92629 100644
--- a/Flow.Launcher.Infrastructure/PinyinAlphabet.cs
+++ b/Flow.Launcher.Infrastructure/PinyinAlphabet.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
@@ -21,6 +21,9 @@ namespace Flow.Launcher.Infrastructure
 
         private ReadOnlyDictionary<string, string> currentDoublePinyinTable;
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="PinyinAlphabet"/> class, loading the double Pinyin table based on current settings and subscribing to setting changes to reload the table and clear the cache as needed.
+        /// </summary>
         public PinyinAlphabet()
         {
             _settings = Ioc.Default.GetRequiredService<Settings>();
@@ -36,12 +39,22 @@ namespace Flow.Launcher.Infrastructure
             };
         }
 
+        /// <summary>
+        /// Reloads the double Pinyin mapping table and clears the translation cache.
+        /// </summary>
         public void Reload()
         {
             LoadDoublePinyinTable();
             _pinyinCache.Clear();
         }
 
+        /// <summary>
+        /// Loads the double Pinyin mapping table for the current schema from a JSON stream.
+        /// </summary>
+        /// <param name="jsonStream">A stream containing the double Pinyin tables in JSON format.</param>
+        /// <exception cref="InvalidOperationException">
+        /// Thrown if the current double Pinyin schema is invalid or the table is missing from the JSON.
+        /// </exception>
         private void CreateDoublePinyinTableFromStream(Stream jsonStream)
         {
             Dictionary<string, Dictionary<string, string>> table = JsonSerializer.Deserialize<Dictionary<string, Dictionary<string, string>>>(jsonStream);
@@ -52,6 +65,9 @@ namespace Flow.Launcher.Infrastructure
             currentDoublePinyinTable = new ReadOnlyDictionary<string, string>(value);
         }
 
+        /// <summary>
+        /// Loads the double Pinyin mapping table from a JSON file if enabled in settings; sets an empty table if loading fails or double Pinyin is disabled.
+        /// </summary>
         private void LoadDoublePinyinTable()
         {
             if (_settings.UseDoublePinyin)
@@ -74,6 +90,13 @@ namespace Flow.Launcher.Infrastructure
             }
         }
 
+        /// <summary>
+        /// Determines whether the specified string should be translated based on current settings and its content.
+        /// </summary>
+        /// <param name="stringToTranslate">The string to evaluate for translation eligibility.</param>
+        /// <returns>
+        /// True if the string contains no Chinese characters and, when double Pinyin is enabled, has an even length; otherwise, false.
+        /// </returns>
         public bool ShouldTranslate(string stringToTranslate)
         {
             return _settings.UseDoublePinyin ?
@@ -81,6 +104,14 @@ namespace Flow.Launcher.Infrastructure
                 !WordsHelper.HasChinese(stringToTranslate);
         }
 
+        /// <summary>
+        /// Translates the input string to Pinyin, returning the translated string and its mapping.
+        /// </summary>
+        /// <param name="content">The string to translate.</param>
+        /// <returns>
+        /// A tuple containing the translated Pinyin string and a <see cref="TranslationMapping"/> object.
+        /// If Pinyin translation is disabled or the input contains no Chinese characters, returns the original string and null mapping.
+        /// </returns>
         public (string translation, TranslationMapping map) Translate(string content)
         {
             if (!_settings.ShouldUsePinyin || !WordsHelper.HasChinese(content))
@@ -91,6 +122,13 @@ namespace Flow.Launcher.Infrastructure
                 : BuildCacheFromContent(content);
         }
 
+        /// <summary>
+        /// Generates the Pinyin or double Pinyin translation and mapping for the given content.
+        /// </summary>
+        /// <param name="content">The input string to translate.</param>
+        /// <returns>
+        /// A tuple containing the translated string and a <see cref="TranslationMapping"/> correlating original and translated indices.
+        /// </returns>
         private (string translation, TranslationMapping map) BuildCacheFromContent(string content)
         {
             var resultList = WordsHelper.GetPinyinList(content);
@@ -138,6 +176,12 @@ namespace Flow.Launcher.Infrastructure
 
         #region Double Pinyin
 
+        /// <summary>
+        /// Converts a full Pinyin syllable to its double Pinyin equivalent using the current mapping table.
+        /// Returns the original Pinyin if no mapping exists.
+        /// </summary>
+        /// <param name="fullPinyin">The full Pinyin syllable to convert.</param>
+        /// <returns>The double Pinyin equivalent if found; otherwise, the original full Pinyin.</returns>
         private string ToDoublePin(string fullPinyin)
         {
             if (currentDoublePinyinTable.TryGetValue(fullPinyin, out var doublePinyinValue))
diff --git a/Flow.Launcher.Infrastructure/StringMatcher.cs b/Flow.Launcher.Infrastructure/StringMatcher.cs
index 2882cb8f0..4401e3b87 100644
--- a/Flow.Launcher.Infrastructure/StringMatcher.cs
+++ b/Flow.Launcher.Infrastructure/StringMatcher.cs
@@ -1,4 +1,4 @@
-using CommunityToolkit.Mvvm.DependencyInjection;
+using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.Plugin.SharedModels;
 using System;
 using System.Collections.Generic;
@@ -60,7 +60,13 @@ namespace Flow.Launcher.Infrastructure
         /// 5. Once the previous character is verified, move on to the next character in the query substring.
         /// 6. Move onto the next substring's characters until all substrings are checked.
         /// 7. Consider success and move onto scoring if every char or substring without whitespaces matched
+        /// <summary>
+        /// Performs fuzzy and acronym-based matching between a query and a target string, returning match details and a relevance score.
         /// </summary>
+        /// <param name="query">The search query to match against the target string.</param>
+        /// <param name="stringToCompare">The string to be compared with the query.</param>
+        /// <param name="opt">Options that control matching behavior, such as case sensitivity.</param>
+        /// <returns>A <see cref="MatchResult"/> indicating whether a match was found, the indices of matched characters, and the computed match score.</returns>
         public MatchResult FuzzyMatch(string query, string stringToCompare, MatchOption opt)
         {
             if (string.IsNullOrEmpty(stringToCompare) || string.IsNullOrEmpty(query))
@@ -228,6 +234,12 @@ namespace Flow.Launcher.Infrastructure
             return new MatchResult(false, UserSettingSearchPrecision);
         }
 
+        /// <summary>
+        /// Determines whether the character at the specified index in the string is considered part of an acronym, either by being an acronym character or a digit.
+        /// </summary>
+        /// <param name="stringToCompare">The string to evaluate.</param>
+        /// <param name="compareStringIndex">The index of the character to check.</param>
+        /// <returns>True if the character is an acronym character or a digit; otherwise, false.</returns>
         private static bool IsAcronym(string stringToCompare, int compareStringIndex)
         {
             if (IsAcronymChar(stringToCompare, compareStringIndex) || IsAcronymNumber(stringToCompare, compareStringIndex))
@@ -236,7 +248,12 @@ namespace Flow.Launcher.Infrastructure
             return false;
         }
 
-        // When counting acronyms, treat a set of numbers as one acronym ie. Visual 2019 as 2 acronyms instead of 5
+        /// <summary>
+        /// Determines whether the character at the specified index should be counted as a distinct acronym character, treating consecutive numbers as a single acronym.
+        /// </summary>
+        /// <param name="stringToCompare">The string being analyzed for acronym characters.</param>
+        /// <param name="compareStringIndex">The index of the character to evaluate.</param>
+        /// <returns>True if the character is an acronym character or the start of a numeric sequence; otherwise, false.</returns>
         private static bool IsAcronymCount(string stringToCompare, int compareStringIndex)
         {
             if (IsAcronymChar(stringToCompare, compareStringIndex))
diff --git a/Flow.Launcher.Infrastructure/TranslationMapping.cs b/Flow.Launcher.Infrastructure/TranslationMapping.cs
index b33a094db..dbe15aaa1 100644
--- a/Flow.Launcher.Infrastructure/TranslationMapping.cs
+++ b/Flow.Launcher.Infrastructure/TranslationMapping.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -13,6 +13,13 @@ namespace Flow.Launcher.Infrastructure
 
         private int translatedLength = 0;
 
+        /// <summary>
+        /// Adds a mapping between an original index and a translated index range.
+        /// </summary>
+        /// <param name="originalIndex">The index in the original sequence.</param>
+        /// <param name="translatedIndex">The starting index of the corresponding range in the translated sequence.</param>
+        /// <param name="length">The length of the translated index range.</param>
+        /// <exception cref="InvalidOperationException">Thrown if the mapping has already been finalized.</exception>
         public void AddNewIndex(int originalIndex, int translatedIndex, int length)
         {
             if (constructed)
@@ -24,6 +31,11 @@ namespace Flow.Launcher.Infrastructure
             translatedLength += length - 1;
         }
 
+        /// <summary>
+        /// Maps a translated index back to its corresponding original index based on stored translation ranges.
+        /// </summary>
+        /// <param name="translatedIndex">The index in the translated sequence to map.</param>
+        /// <returns>The corresponding index in the original sequence. If the translated index falls outside known ranges, returns an adjusted index based on accumulated translation lengths.</returns>
         public int MapToOriginalIndex(int translatedIndex)
         {
             if (translatedIndex > translatedIndexes.Last())
@@ -86,6 +98,10 @@ namespace Flow.Launcher.Infrastructure
             }
         }
 
+        /// <summary>
+        /// Finalizes the mapping, preventing any further modifications.
+        /// </summary>
+        /// <exception cref="InvalidOperationException">Thrown if the mapping has already been finalized.</exception>
         public void endConstruct()
         {
             if (constructed)