diff --git a/app/MindWork AI Studio/Dialogs/SystemPromptDialog.razor b/app/MindWork AI Studio/Dialogs/SystemPromptDialog.razor
new file mode 100644
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+++ b/app/MindWork AI Studio/Dialogs/SystemPromptDialog.razor	
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+@inherits MSGComponentBase
+
+<MudDialog>
+    <DialogContent>
+        <MudJustifiedText Typo="Typo.body1" Class="mb-3">
+            @T("This is the complete system prompt the AI receives with your next message. AI Studio assembles it from the parts listed here.")
+        </MudJustifiedText>
+
+        @* In the order in which the parts appear in the prompt below: *@
+        <MudSimpleTable Dense="@true" Class="mb-6">
+            <tbody>
+                <tr>
+                    <td>@T("Date and time")</td>
+                    <td>@this.DateTimeText</td>
+                </tr>
+                <tr>
+                    <td>@T("Chat template")</td>
+                    <td>@this.ChatTemplateText</td>
+                </tr>
+                <tr>
+                    <td>@T("Data from your data sources")</td>
+                    <td>@this.RetrievedDataText</td>
+                </tr>
+                <tr>
+                    <td>@T("Profile")</td>
+                    <td>@this.ProfileText</td>
+                </tr>
+                <tr>
+                    <td>@T("Tool instructions")</td>
+                    <td>@this.ToolNamesText</td>
+                </tr>
+            </tbody>
+        </MudSimpleTable>
+
+        <TextInfoLines Label="@T("Complete system prompt")" MaxLines="20" Value="@this.SystemPrompt" ClipboardTooltipSubject="@T("the complete system prompt")"/>
+    </DialogContent>
+    <DialogActions>
+        <MudButton OnClick="@this.Close" Variant="Variant.Filled" Color="Color.Primary">
+            @T("Close")
+        </MudButton>
+    </DialogActions>
+</MudDialog>
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diff --git a/app/MindWork AI Studio/Dialogs/SystemPromptDialog.razor.cs b/app/MindWork AI Studio/Dialogs/SystemPromptDialog.razor.cs
new file mode 100644
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--- /dev/null
+++ b/app/MindWork AI Studio/Dialogs/SystemPromptDialog.razor.cs	
@@ -0,0 +1,97 @@
+using AIStudio.Components;
+
+using Microsoft.AspNetCore.Components;
+
+namespace AIStudio.Dialogs;
+
+/// <summary>
+/// Shows the system prompt a chat sends, together with the parts it was assembled from.
+/// </summary>
+/// <remarks>
+/// Nobody types this prompt as it is sent. A chat template replaces the default, a profile, the
+/// retrieved data of a data source, and the policy of the selected tools are added to it, and the
+/// date goes in front. The list above the text names these parts, so a person does not have to
+/// work out from the text alone where a paragraph came from.
+/// </remarks>
+public partial class SystemPromptDialog : MSGComponentBase
+{
+    [CascadingParameter]
+    private IMudDialogInstance MudDialog { get; set; } = null!;
+
+    /// <summary>
+    /// The whole system prompt, as the provider receives it.
+    /// </summary>
+    [Parameter]
+    public string SystemPrompt { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The name of the chat template whose prompt replaces the default, or empty when there is none.
+    /// </summary>
+    [Parameter]
+    public string ChatTemplateName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// The name of the profile which takes part, or empty when there is none.
+    /// </summary>
+    [Parameter]
+    public string ProfileName { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Whether the chat template forbids a profile, which explains why none takes part even though one may be selected.
+    /// </summary>
+    [Parameter]
+    public bool IsProfileForbiddenByChatTemplate { get; set; }
+
+    /// <summary>
+    /// Whether the prompt carries data retrieved from a data source.
+    /// </summary>
+    [Parameter]
+    public bool HasRetrievedData { get; set; }
+
+    /// <summary>
+    /// The names of the tools whose usage policy is part of the prompt.
+    /// </summary>
+    [Parameter]
+    public IReadOnlyList<string> ToolNames { get; set; } = [];
+
+    /// <summary>
+    /// Whether the current date and time go in front of the prompt.
+    /// </summary>
+    [Parameter]
+    public bool IncludesDateTime { get; set; }
+
+    private string ChatTemplateText => string.IsNullOrWhiteSpace(this.ChatTemplateName)
+        ? T("None")
+        : this.ChatTemplateName;
+
+    private string ProfileText
+    {
+        get
+        {
+            if (this.IsProfileForbiddenByChatTemplate)
+                return T("Switched off by the chat template");
+
+            return string.IsNullOrWhiteSpace(this.ProfileName)
+                ? T("None")
+                : this.ProfileName;
+        }
+    }
+
+    //
+    // Not promised to be refreshed with the next message: the data is replaced only when a new
+    // retrieval finds something. Until then, what was retrieved earlier travels along again.
+    //
+    private string RetrievedDataText => this.HasRetrievedData
+        ? T("Included, retrieved for an earlier message")
+        : T("None");
+
+    private string ToolNamesText => this.ToolNames.Count == 0
+        ? T("None")
+        : string.Join(", ", this.ToolNames);
+
+    private string DateTimeText => this.IncludesDateTime
+        ? T("Included")
+        : T("Not included");
+
+    private void Close() => this.MudDialog.Close();
+}
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