diff --git a/app/MindWork AI Studio/Agents/AgentDataSourceSelection.cs b/app/MindWork AI Studio/Agents/AgentDataSourceSelection.cs
index 23278973..778fafb9 100644
--- a/app/MindWork AI Studio/Agents/AgentDataSourceSelection.cs	
+++ b/app/MindWork AI Studio/Agents/AgentDataSourceSelection.cs	
@@ -188,11 +188,23 @@ public sealed class AgentDataSourceSelection (ILogger<AgentDataSourceSelection>
             switch (ds)
             {
                 case DataSourceLocalDirectory localDirectory:
-                    sb.AppendLine($"- Id={ds.Id}, name='{localDirectory.Name}', type=local directory, path='{localDirectory.Path}'");
+                    if (string.IsNullOrWhiteSpace(localDirectory.Description))
+                        sb.AppendLine($"- Id={ds.Id}, name='{localDirectory.Name}', type=local directory, path='{localDirectory.Path}'");
+                    else
+                    {
+                        var description = localDirectory.Description.Replace("\n", " ").Replace("\r", " ");
+                        sb.AppendLine($"- Id={ds.Id}, name='{localDirectory.Name}', type=local directory, path='{localDirectory.Path}', description='{description}'");
+                    }
                     break;
 
                 case DataSourceLocalFile localFile:
-                    sb.AppendLine($"- Id={ds.Id}, name='{localFile.Name}', type=local file, path='{localFile.FilePath}'");
+                    if (string.IsNullOrWhiteSpace(localFile.Description))
+                        sb.AppendLine($"- Id={ds.Id}, name='{localFile.Name}', type=local file, path='{localFile.FilePath}'");
+                    else
+                    {
+                        var description = localFile.Description.Replace("\n", " ").Replace("\r", " ");
+                        sb.AppendLine($"- Id={ds.Id}, name='{localFile.Name}', type=local file, path='{localFile.FilePath}', description='{description}'");
+                    }
                     break;
 
                 case IERIDataSource eriDataSource:
diff --git a/app/MindWork AI Studio/Assistants/I18N/allTexts.lua b/app/MindWork AI Studio/Assistants/I18N/allTexts.lua
index 55058f2b..431277f2 100644
--- a/app/MindWork AI Studio/Assistants/I18N/allTexts.lua	
+++ b/app/MindWork AI Studio/Assistants/I18N/allTexts.lua	
@@ -2689,12 +2689,18 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCEERI_V1INFODIALOG::T742006305"] = "
 -- Embeddings
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCEERI_V1INFODIALOG::T951463987"] = "Embeddings"
 
+-- Describe what data this directory contains to help the AI select it.
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1136409150"] = "Describe what data this directory contains to help the AI select it."
+
 -- Select a root directory for this data source. All data in this directory and all its subdirectories will be processed for this data source.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1265737624"] = "Select a root directory for this data source. All data in this directory and all its subdirectories will be processed for this data source."
 
 -- Selected base directory for this data source
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1312296210"] = "Selected base directory for this data source"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1725856265"] = "Description"
+
 -- How many matches do you want at most per query?
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1827669611"] = "How many matches do you want at most per query?"
 
@@ -2752,6 +2758,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1101400
 -- Data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T171124909"] = "Data source name"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1725856265"] = "Description"
+
 -- the number of files in the directory
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1795263412"] = "the number of files in the directory"
 
@@ -2764,6 +2773,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2072700
 -- the maximum number of matches per query
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2479753122"] = "the maximum number of matches per query"
 
+-- the description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2658359966"] = "the description"
+
 -- the data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2717738728"] = "the data source name"
 
@@ -2812,6 +2824,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T4458586
 -- Select a file for this data source. The content of this file will be processed for the data source.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1190880267"] = "Select a file for this data source. The content of this file will be processed for the data source."
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1725856265"] = "Description"
+
 -- How many matches do you want at most per query?
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1827669611"] = "How many matches do you want at most per query?"
 
@@ -2836,6 +2851,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2814869210"] = "
 -- Embedding
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2838542994"] = "Embedding"
 
+-- Describe what data this file contains to help the AI select it.
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2859265837"] = "Describe what data this file contains to help the AI select it."
+
 -- For some data types, such as Office files, MindWork AI Studio requires the open-source application Pandoc.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T3359366900"] = "For some data types, such as Office files, MindWork AI Studio requires the open-source application Pandoc."
 
@@ -2869,6 +2887,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1294177559"]
 -- Data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T171124909"] = "Data source name"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1725856265"] = "Description"
+
 -- The embedding runs locally or in your organization. Your data is not sent to the cloud.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1950544032"] = "The embedding runs locally or in your organization. Your data is not sent to the cloud."
 
@@ -2878,6 +2899,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2235729121"]
 -- the maximum number of matches per query
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2479753122"] = "the maximum number of matches per query"
 
+-- the description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2658359966"] = "the description"
+
 -- the data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2717738728"] = "the data source name"
 
diff --git a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor
index d21244de..7cdae497 100644
--- a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor	
+++ b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor	
@@ -18,6 +18,24 @@
                 AdornmentIcon="@Icons.Material.Filled.Lightbulb"
                 AdornmentColor="Color.Info"
                 UserAttributes="@SPELLCHECK_ATTRIBUTES"
+                Variant="Variant.Outlined"
+            />
+
+            <MudTextField
+                T="string"
+                @bind-Text="@this.dataDescription"
+                Label="@T("Description")"
+                Class="mb-6"
+                MaxLength="200"
+                Counter="200"
+                Immediate="@true"
+                Adornment="Adornment.Start"
+                AdornmentIcon="@Icons.Material.Filled.Description"
+                AdornmentColor="Color.Info"
+                HelperText="@T("Describe what data this directory contains to help the AI select it.")"
+                UserAttributes="@SPELLCHECK_ATTRIBUTES"
+                Variant="Variant.Outlined"
+                Lines="3"
             />
 
             <MudJustifiedText Typo="Typo.body1" Class="mb-3">
diff --git a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor.cs b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor.cs
index b4f62a79..019312da 100644
--- a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor.cs	
+++ b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryDialog.razor.cs	
@@ -37,6 +37,7 @@ public partial class DataSourceLocalDirectoryDialog : MSGComponentBase
     private uint dataNum;
     private string dataId = Guid.NewGuid().ToString();
     private string dataName = string.Empty;
+    private string dataDescription = string.Empty;
     private bool dataUserAcknowledgedCloudEmbedding;
     private string dataEmbeddingId = string.Empty;
     private string dataPath = string.Empty;
@@ -73,6 +74,7 @@ public partial class DataSourceLocalDirectoryDialog : MSGComponentBase
             this.dataNum = this.DataSource.Num;
             this.dataId = this.DataSource.Id;
             this.dataName = this.DataSource.Name;
+            this.dataDescription = this.DataSource.Description;
             this.dataEmbeddingId = this.DataSource.EmbeddingId;
             this.dataPath = this.DataSource.Path;
             this.dataSecurityPolicy = this.DataSource.SecurityPolicy;
@@ -101,6 +103,7 @@ public partial class DataSourceLocalDirectoryDialog : MSGComponentBase
         Id = this.dataId,
         Num = this.dataNum,
         Name = this.dataName,
+        Description = this.dataDescription,
         Type = DataSourceType.LOCAL_DIRECTORY,
         EmbeddingId = this.dataEmbeddingId,
         Path = this.dataPath,
diff --git a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor
index b529a78a..e80bad6a 100644
--- a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor	
+++ b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor	
@@ -4,7 +4,11 @@
 <MudDialog>
     <DialogContent>
         <TextInfoLine Icon="@Icons.Material.Filled.Tag" Label="@T("Data source name")" Value="@this.DataSource.Name" ClipboardTooltipSubject="@T("the data source name")"/>
-        
+        @if (!string.IsNullOrWhiteSpace(this.DataSource.Description))
+        {
+            <TextInfoLines Label="@T("Description")" Value="@this.DataSource.Description" MaxLines="5" ClipboardTooltipSubject="@T("the description")"/>
+        }
+
         <TextInfoLine Icon="@Icons.Material.Filled.FolderOpen" Label="@T("Path")" Value="@this.DataSource.Path" ClipboardTooltipSubject="@T("this path")"/>
         @if (!this.IsDirectoryAvailable)
         {
@@ -37,7 +41,7 @@
         <TextInfoLine Label="@T("Maximum matches per query")" Value="@this.DataSource.MaxMatches.ToString()" ClipboardTooltipSubject="@T("the maximum number of matches per query")"/>
 
         <TextInfoLine Icon="@Icons.Material.Filled.SquareFoot" Label="@T("Number of files")" Value="@this.NumberFilesInDirectory" ClipboardTooltipSubject="@T("the number of files in the directory")"/>
-        <TextInfoLines Label="@T("Files list")" MaxLines="14" Value="@this.directoryFiles.ToString()" ClipboardTooltipSubject="@T("the files list")"/>
+        <TextInfoLines Label="@T("Files list")" MaxLines="14" Value="@this.directoryFilesText" ClipboardTooltipSubject="@T("the files list")"/>
         @if (this.directorySizeNumFiles > 100)
         {
             <MudJustifiedText Typo="Typo.body1" Color="Color.Warning" Class="mb-3">
diff --git a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor.cs b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor.cs
index 839fd5b8..73bc8dc6 100644
--- a/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor.cs	
+++ b/app/MindWork AI Studio/Dialogs/DataSourceLocalDirectoryInfoDialog.razor.cs	
@@ -51,6 +51,7 @@ public partial class DataSourceLocalDirectoryInfoDialog : MSGComponentBase, IAsy
     private long directorySizeBytes;
     private long directorySizeNumFiles;
     private readonly StringBuilder directoryFiles = new();
+    private string directoryFilesText = string.Empty;
     private Task directorySizeTask = Task.CompletedTask;
     
     private bool IsOperationInProgress { get; set; } = true;
@@ -63,6 +64,7 @@ public partial class DataSourceLocalDirectoryInfoDialog : MSGComponentBase, IAsy
     {
         this.directoryFiles.Append("- ");
         this.directoryFiles.AppendLine(file);
+        this.directoryFilesText = this.directoryFiles.ToString();
     }
 
     private void UpdateDirectorySize(long size)
diff --git a/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor b/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor
index ccff69e9..d360b0de 100644
--- a/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor	
+++ b/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor	
@@ -18,6 +18,24 @@
                 AdornmentIcon="@Icons.Material.Filled.Lightbulb"
                 AdornmentColor="Color.Info"
                 UserAttributes="@SPELLCHECK_ATTRIBUTES"
+                Variant="Variant.Outlined"
+            />
+
+            <MudTextField
+                T="string"
+                @bind-Text="@this.dataDescription"
+                Label="@T("Description")"
+                Class="mb-6"
+                MaxLength="200"
+                Counter="200"
+                Immediate="@true"
+                Adornment="Adornment.Start"
+                AdornmentIcon="@Icons.Material.Filled.Description"
+                AdornmentColor="Color.Info"
+                HelperText="@T("Describe what data this file contains to help the AI select it.")"
+                UserAttributes="@SPELLCHECK_ATTRIBUTES"
+                Variant="Variant.Outlined"
+                Lines="3"
             />
 
             <MudJustifiedText Typo="Typo.body1" Class="mb-3">
diff --git a/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor.cs b/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor.cs
index 7418a4fa..76d93c35 100644
--- a/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor.cs	
+++ b/app/MindWork AI Studio/Dialogs/DataSourceLocalFileDialog.razor.cs	
@@ -37,6 +37,7 @@ public partial class DataSourceLocalFileDialog : MSGComponentBase
     private uint dataNum;
     private string dataId = Guid.NewGuid().ToString();
     private string dataName = string.Empty;
+    private string dataDescription = string.Empty;
     private bool dataUserAcknowledgedCloudEmbedding;
     private string dataEmbeddingId = string.Empty;
     private string dataFilePath = string.Empty;
@@ -73,6 +74,7 @@ public partial class DataSourceLocalFileDialog : MSGComponentBase
             this.dataNum = this.DataSource.Num;
             this.dataId = this.DataSource.Id;
             this.dataName = this.DataSource.Name;
+            this.dataDescription = this.DataSource.Description;
             this.dataEmbeddingId = this.DataSource.EmbeddingId;
             this.dataFilePath = this.DataSource.FilePath;
             this.dataSecurityPolicy = this.DataSource.SecurityPolicy;
@@ -101,6 +103,7 @@ public partial class DataSourceLocalFileDialog : MSGComponentBase
         Id = this.dataId,
         Num = this.dataNum,
         Name = this.dataName,
+        Description = this.dataDescription,
         Type = DataSourceType.LOCAL_FILE,
         EmbeddingId = this.dataEmbeddingId,
         FilePath = this.dataFilePath,
diff --git a/app/MindWork AI Studio/Dialogs/DataSourceLocalFileInfoDialog.razor b/app/MindWork AI Studio/Dialogs/DataSourceLocalFileInfoDialog.razor
index 2b4a9d78..61d07916 100644
--- a/app/MindWork AI Studio/Dialogs/DataSourceLocalFileInfoDialog.razor	
+++ b/app/MindWork AI Studio/Dialogs/DataSourceLocalFileInfoDialog.razor	
@@ -4,6 +4,11 @@
 <MudDialog>
     <DialogContent>
         <TextInfoLine Icon="@Icons.Material.Filled.Tag" Label="@T("Data source name")" Value="@this.DataSource.Name" ClipboardTooltipSubject="@T("the data source name")"/>
+        @if (!string.IsNullOrWhiteSpace(this.DataSource.Description))
+        {
+            <TextInfoLines Label="@T("Description")" Value="@this.DataSource.Description" MaxLines="5" ClipboardTooltipSubject="@T("the description")"/>
+        }
+
         <TextInfoLine Icon="@Icons.Material.Filled.FolderOpen" Label="@T("File path")" Value="@this.DataSource.FilePath" ClipboardTooltipSubject="@T("this path")"/>
         @if (!this.IsFileAvailable)
         {
diff --git a/app/MindWork AI Studio/Plugins/languages/de-de-43065dbc-78d0-45b7-92be-f14c2926e2dc/plugin.lua b/app/MindWork AI Studio/Plugins/languages/de-de-43065dbc-78d0-45b7-92be-f14c2926e2dc/plugin.lua
index 52ba4461..e97c1721 100644
--- a/app/MindWork AI Studio/Plugins/languages/de-de-43065dbc-78d0-45b7-92be-f14c2926e2dc/plugin.lua	
+++ b/app/MindWork AI Studio/Plugins/languages/de-de-43065dbc-78d0-45b7-92be-f14c2926e2dc/plugin.lua	
@@ -2691,12 +2691,18 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCEERI_V1INFODIALOG::T742006305"] = "
 -- Embeddings
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCEERI_V1INFODIALOG::T951463987"] = "Einbettungen"
 
+-- Describe what data this directory contains to help the AI select it.
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1136409150"] = "Beschreiben Sie, welche Daten dieses Verzeichnis enthält, um der KI bei der Auswahl zu helfen."
+
 -- Select a root directory for this data source. All data in this directory and all its subdirectories will be processed for this data source.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1265737624"] = "Wählen Sie ein Stammverzeichnis für diese Datenquelle aus. Alle Daten in diesem Verzeichnis und in allen Unterverzeichnissen werden für diese Datenquelle verarbeitet."
 
 -- Selected base directory for this data source
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1312296210"] = "Ausgewähltes Stammverzeichnis für diese Datenquelle"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1725856265"] = "Beschreibung"
+
 -- How many matches do you want at most per query?
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1827669611"] = "Wie viele Treffer möchten Sie maximal pro Abfrage erhalten?"
 
@@ -2754,6 +2760,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1101400
 -- Data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T171124909"] = "Name der Datenquellen"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1725856265"] = "Beschreibung"
+
 -- the number of files in the directory
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1795263412"] = "die Anzahl der Dateien im Verzeichnis"
 
@@ -2766,6 +2775,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2072700
 -- the maximum number of matches per query
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2479753122"] = "die maximale Anzahl an Treffern pro Abfrage"
 
+-- the description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2658359966"] = "Die Beschreibung"
+
 -- the data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2717738728"] = "den Namen der Datenquelle"
 
@@ -2814,6 +2826,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T4458586
 -- Select a file for this data source. The content of this file will be processed for the data source.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1190880267"] = "Wählen Sie eine Datei für diese Datenquelle aus. Der Inhalt dieser Datei wird für die Datenquelle verarbeitet."
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1725856265"] = "Beschreibung"
+
 -- How many matches do you want at most per query?
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1827669611"] = "Wie viele Treffer möchten Sie maximal pro Abfrage erhalten?"
 
@@ -2838,6 +2853,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2814869210"] = "
 -- Embedding
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2838542994"] = "Einbettung"
 
+-- Describe what data this file contains to help the AI select it.
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2859265837"] = "Beschreiben Sie, welche Daten diese Datei enthält, um der KI bei der Auswahl zu helfen."
+
 -- For some data types, such as Office files, MindWork AI Studio requires the open-source application Pandoc.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T3359366900"] = "Für einige Dateitypen, wie zum Beispiel Office-Dateien, benötigt MindWork AI Studio die Open-Source-Anwendung Pandoc."
 
@@ -2871,6 +2889,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1294177559"]
 -- Data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T171124909"] = "Name der Datenquelle"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1725856265"] = "Beschreibung"
+
 -- The embedding runs locally or in your organization. Your data is not sent to the cloud.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1950544032"] = "Die Einbettung erfolgt lokal oder in ihrem Unternehmen. Ihre Daten werden nicht in die Cloud gesendet."
 
@@ -2880,6 +2901,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2235729121"]
 -- the maximum number of matches per query
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2479753122"] = "die maximale Anzahl an Treffern pro Abfrage"
 
+-- the description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2658359966"] = "Die Beschreibung"
+
 -- the data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2717738728"] = "den Namen der Datenquelle"
 
diff --git a/app/MindWork AI Studio/Plugins/languages/en-us-97dfb1ba-50c4-4440-8dfa-6575daf543c8/plugin.lua b/app/MindWork AI Studio/Plugins/languages/en-us-97dfb1ba-50c4-4440-8dfa-6575daf543c8/plugin.lua
index 0aecd496..2462eb98 100644
--- a/app/MindWork AI Studio/Plugins/languages/en-us-97dfb1ba-50c4-4440-8dfa-6575daf543c8/plugin.lua	
+++ b/app/MindWork AI Studio/Plugins/languages/en-us-97dfb1ba-50c4-4440-8dfa-6575daf543c8/plugin.lua	
@@ -2691,12 +2691,18 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCEERI_V1INFODIALOG::T742006305"] = "
 -- Embeddings
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCEERI_V1INFODIALOG::T951463987"] = "Embeddings"
 
+-- Describe what data this directory contains to help the AI select it.
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1136409150"] = "Describe what data this directory contains to help the AI select it."
+
 -- Select a root directory for this data source. All data in this directory and all its subdirectories will be processed for this data source.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1265737624"] = "Select a root directory for this data source. All data in this directory and all its subdirectories will be processed for this data source."
 
 -- Selected base directory for this data source
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1312296210"] = "Selected base directory for this data source"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1725856265"] = "Description"
+
 -- How many matches do you want at most per query?
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYDIALOG::T1827669611"] = "How many matches do you want at most per query?"
 
@@ -2754,6 +2760,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1101400
 -- Data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T171124909"] = "Data source name"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1725856265"] = "Description"
+
 -- the number of files in the directory
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T1795263412"] = "the number of files in the directory"
 
@@ -2766,6 +2775,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2072700
 -- the maximum number of matches per query
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2479753122"] = "the maximum number of matches per query"
 
+-- the description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2658359966"] = "the description"
+
 -- the data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T2717738728"] = "the data source name"
 
@@ -2814,6 +2826,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALDIRECTORYINFODIALOG::T4458586
 -- Select a file for this data source. The content of this file will be processed for the data source.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1190880267"] = "Select a file for this data source. The content of this file will be processed for the data source."
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1725856265"] = "Description"
+
 -- How many matches do you want at most per query?
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T1827669611"] = "How many matches do you want at most per query?"
 
@@ -2838,6 +2853,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2814869210"] = "
 -- Embedding
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2838542994"] = "Embedding"
 
+-- Describe what data this file contains to help the AI select it.
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T2859265837"] = "Describe what data this file contains to help the AI select it."
+
 -- For some data types, such as Office files, MindWork AI Studio requires the open-source application Pandoc.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEDIALOG::T3359366900"] = "For some data types, such as Office files, MindWork AI Studio requires the open-source application Pandoc."
 
@@ -2871,6 +2889,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1294177559"]
 -- Data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T171124909"] = "Data source name"
 
+-- Description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1725856265"] = "Description"
+
 -- The embedding runs locally or in your organization. Your data is not sent to the cloud.
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T1950544032"] = "The embedding runs locally or in your organization. Your data is not sent to the cloud."
 
@@ -2880,6 +2901,9 @@ UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2235729121"]
 -- the maximum number of matches per query
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2479753122"] = "the maximum number of matches per query"
 
+-- the description
+UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2658359966"] = "the description"
+
 -- the data source name
 UI_TEXT_CONTENT["AISTUDIO::DIALOGS::DATASOURCELOCALFILEINFODIALOG::T2717738728"] = "the data source name"
 
diff --git a/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs
index 8e180095..d8b263c3 100644
--- a/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs	
+++ b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalDirectory.cs	
@@ -20,7 +20,13 @@ public readonly record struct DataSourceLocalDirectory : IInternalDataSource
     
     /// <inheritdoc />
     public string Name { get; init; } = string.Empty;
-    
+
+    /// <summary>
+    /// The description of the data source. What kind of data does it contain?
+    /// What is the data source used for?
+    /// </summary>
+    public string Description { get; init; } = string.Empty;
+
     /// <inheritdoc />
     public DataSourceType Type { get; init; } = DataSourceType.NONE;
     
diff --git a/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs
index 5a04a8a0..11b857d0 100644
--- a/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs	
+++ b/app/MindWork AI Studio/Settings/DataModel/DataSourceLocalFile.cs	
@@ -20,7 +20,13 @@ public readonly record struct DataSourceLocalFile : IInternalDataSource
     
     /// <inheritdoc />
     public string Name { get; init; } = string.Empty;
-    
+
+    /// <summary>
+    /// The description of the data source. What kind of data does it contain?
+    /// What is the data source used for?
+    /// </summary>
+    public string Description { get; init; } = string.Empty;
+
     /// <inheritdoc />
     public DataSourceType Type { get; init; } = DataSourceType.NONE;
     
diff --git a/app/MindWork AI Studio/Tools/DirectoryInfoExtensions.cs b/app/MindWork AI Studio/Tools/DirectoryInfoExtensions.cs
index 70adcab7..095a4e96 100644
--- a/app/MindWork AI Studio/Tools/DirectoryInfoExtensions.cs	
+++ b/app/MindWork AI Studio/Tools/DirectoryInfoExtensions.cs	
@@ -59,8 +59,7 @@ public static class DirectoryInfoExtensions
 
         reportCurrentTotalSize(totalSize);
         reportCurrentNumFiles(numFiles);
-        
-        if(done is not null)
-            done();
+
+        done?.Invoke();
     }
 }
\ No newline at end of file
diff --git a/app/MindWork AI Studio/wwwroot/changelog/v0.9.55.md b/app/MindWork AI Studio/wwwroot/changelog/v0.9.55.md
index 02652067..fb8ab9d2 100644
--- a/app/MindWork AI Studio/wwwroot/changelog/v0.9.55.md	
+++ b/app/MindWork AI Studio/wwwroot/changelog/v0.9.55.md	
@@ -1,5 +1,7 @@
 # v0.9.55, build 230 (2025-12-xx xx:xx UTC)
 - Added support for newer Mistral models (Mistral 3, Voxtral, and Magistral).
+- Added a description field to local data sources (preview feature) so that the data selection agent has more information about which data each local source contains when selecting data sources.
 - Improved the document analysis assistant (in preview) by adding descriptions to the different sections.
 - Improved the document preview dialog for the document analysis assistant (in preview), providing Markdown and plain text views for attached files.
 - Improved the ID handling for configuration plugins.
+- Fixed a bug in the local data sources info dialog (preview feature) for data directories that could cause the app to crash. The error was caused by a background thread producing data while the frontend attempted to display it.
\ No newline at end of file