diff --git a/app/MindWork AI Studio/Chat/ContentText.cs b/app/MindWork AI Studio/Chat/ContentText.cs
index d86424cb..661dcc95 100644
--- a/app/MindWork AI Studio/Chat/ContentText.cs	
+++ b/app/MindWork AI Studio/Chat/ContentText.cs	
@@ -55,6 +55,49 @@ public sealed class ContentText : IContent
     [JsonIgnore]
     public ToolRuntimeStatus ToolRuntimeStatus { get; set; } = new();
 
+    /// <summary>
+    /// What the tool conversation of the running request adds to it, as far as it has got.
+    /// </summary>
+    /// <remarks>
+    /// A model which calls tools asks several times before it answers, and every one of those
+    /// requests carries everything the tools returned so far -- up to three hundred thousand
+    /// characters of it. None of that is in this block's text, and none of it is in the traces
+    /// either: those say what happened, not what it costs. So it is kept here, where whoever
+    /// counts the conversation walks past anyway.<br/><br/>
+    /// Replaced as a whole, never appended to: it is written by the thread which runs the tools
+    /// and read by the one which renders, and an exchange leaves the reader with a list which was
+    /// true at some moment rather than with one being rewritten under it.<br/><br/>
+    /// Gone when the answer is there, and never persisted. The accumulated tool conversation lives
+    /// in the provider adapter, which is created for one request and dropped with it -- so the next
+    /// request does not carry it, and a number which still counted it would promise a cost nobody
+    /// is going to pay.
+    /// </remarks>
+    [JsonIgnore]
+    public IReadOnlyList<string> PendingToolConversation { get; set; } = [];
+
+    /// <summary>
+    /// Clears what the previous run of the tools left behind.
+    /// </summary>
+    /// <remarks>
+    /// Both parts at once, because both belong to one request: the traces the user reads and the
+    /// payload the counting needs. They were cleared separately for exactly as long as there was
+    /// only one of them.
+    /// </remarks>
+    public void BeginToolRun()
+    {
+        this.ToolInvocations.Clear();
+        this.PendingToolConversation = [];
+    }
+
+    /// <summary>
+    /// Says that no request is running anymore.
+    /// </summary>
+    /// <remarks>
+    /// The traces stay -- they are what the user reads afterwards to see how the answer came
+    /// about. What goes is the payload, which belonged to a request that is over.
+    /// </remarks>
+    public void EndToolRun() => this.PendingToolConversation = [];
+
     /// <inheritdoc />
     public async Task<ChatThread> CreateFromProviderAsync(IProvider provider, Model chatModel, IContent? lastUserPrompt, ChatThread? chatThread, CancellationToken token = default)
     {
@@ -177,7 +220,8 @@ public sealed class ContentText : IContent
         finally
         {
             this.Text = this.Text.RemoveThinkTags().Trim();
-        
+            this.EndToolRun();
+
             // Inform the UI that the streaming is done:
             await this.StreamingDone();
         }
diff --git a/app/MindWork AI Studio/Chat/ConversationParts.cs b/app/MindWork AI Studio/Chat/ConversationParts.cs
index 3c6e8dc1..b5b25d2c 100644
--- a/app/MindWork AI Studio/Chat/ConversationParts.cs	
+++ b/app/MindWork AI Studio/Chat/ConversationParts.cs	
@@ -9,6 +9,11 @@ namespace AIStudio.Chat;
 /// sends: the system prompt, the text of every block, and the attachments hanging off those
 /// blocks -- plus whatever is standing in the composer but has not been sent yet, because that is
 /// the part a person is deciding about while they look at the number.
+///
+/// And, while a request is running, what its tools have returned so far. That is the one part
+/// which is not about the next request but about the one in flight: it is what the model is
+/// reading at this moment, it is what fills the window while somebody watches, and it is gone
+/// again once the answer stands.
 /// </remarks>
 public sealed record ConversationParts
 {
@@ -23,13 +28,17 @@ public sealed record ConversationParts
     public IReadOnlyList<string> Texts { get; init; } = [];
 
     /// <summary>
-    /// The texts which are still being written.
+    /// The texts which belong to this moment alone.
     /// </summary>
     /// <remarks>
     /// They cost exactly what the others cost; what sets them apart is that they will never be seen
     /// again in this shape. The sentence somebody is typing changes with the next pause, and an
     /// answer being streamed is a different text three seconds later -- so remembering what they
     /// cost fills memory with answers nobody will ask for again.
+    ///
+    /// What a model's tools have returned so far belongs here for the same reason, although nobody
+    /// is writing it: it travels with every further round of one request and with nothing after
+    /// that, so it is measured while it matters and forgotten when the answer is there.
     /// </remarks>
     public IReadOnlyList<string> GrowingTexts { get; init; } = [];
 
@@ -48,7 +57,9 @@ public sealed record ConversationParts
     /// </summary>
     /// <remarks>
     /// Blocks without text are skipped, because the message builder skips them too: a block whose
-    /// text is empty never becomes a message, whatever else hangs off it.
+    /// text is empty never becomes a message, whatever else hangs off it. What such a block may
+    /// still carry is the tool conversation of a request which is running right now -- that one
+    /// does travel, and it is read before the text is looked at.
     /// </remarks>
     /// <param name="thread">The conversation so far, or null when there is none yet.</param>
     /// <param name="systemPrompt">
@@ -79,7 +90,18 @@ public sealed record ConversationParts
             //
             foreach (var block in thread.Blocks)
             {
-                if (block.ContentType is not ContentType.TEXT || block.Content is not ContentText text || string.IsNullOrWhiteSpace(text.Text))
+                if (block.ContentType is not ContentType.TEXT || block.Content is not ContentText text)
+                    continue;
+
+                //
+                // Asked before the text is, because while a model calls tools there is no text yet:
+                // the answer arrives in one piece at the end, and everything in between travels as
+                // the tool conversation. A block skipped for having nothing to say is exactly the
+                // block whose request is growing the fastest.
+                //
+                growing.AddRange(text.PendingToolConversation);
+
+                if (string.IsNullOrWhiteSpace(text.Text))
                     continue;
 
                 if (text.IsStreaming)
diff --git a/app/MindWork AI Studio/Provider/Anthropic/ProviderAnthropic.cs b/app/MindWork AI Studio/Provider/Anthropic/ProviderAnthropic.cs
index cab47ab9..71138df9 100644
--- a/app/MindWork AI Studio/Provider/Anthropic/ProviderAnthropic.cs	
+++ b/app/MindWork AI Studio/Provider/Anthropic/ProviderAnthropic.cs	
@@ -81,7 +81,7 @@ public sealed class ProviderAnthropic() : BaseProvider(LLMProviders.ANTHROPIC, n
         var toolRegistry = Program.SERVICE_PROVIDER.GetService<ToolRegistry>();
         var toolExecutor = Program.SERVICE_PROVIDER.GetService<ToolExecutor>();
         var currentAssistantContent = chatThread.Blocks.LastOrDefault(x => x.Role is ChatRole.AI)?.Content as ContentText;
-        currentAssistantContent?.ToolInvocations.Clear();
+        currentAssistantContent?.BeginToolRun();
 
         var providerSettings = this.CreateSettingsProvider(chatModel);
         var runnableTools = toolRegistry is null
diff --git a/app/MindWork AI Studio/Provider/BaseProvider.cs b/app/MindWork AI Studio/Provider/BaseProvider.cs
index 2c15830c..76541bbb 100644
--- a/app/MindWork AI Studio/Provider/BaseProvider.cs	
+++ b/app/MindWork AI Studio/Provider/BaseProvider.cs	
@@ -1270,7 +1270,7 @@ public abstract class BaseProvider : IProvider, ISecretId
         var toolRegistry = Program.SERVICE_PROVIDER.GetService<ToolRegistry>();
         var toolExecutor = Program.SERVICE_PROVIDER.GetService<ToolExecutor>();
         var currentAssistantContent = chatThread.Blocks.LastOrDefault(x => x.Role is ChatRole.AI)?.Content as ContentText;
-        currentAssistantContent?.ToolInvocations.Clear();
+        currentAssistantContent?.BeginToolRun();
 
         TextMessage systemPrompt;
         if (toolRegistry is not null && toolExecutor is not null)
diff --git a/app/MindWork AI Studio/Provider/OpenAI/ProviderOpenAI.cs b/app/MindWork AI Studio/Provider/OpenAI/ProviderOpenAI.cs
index 7de4e08f..92c9d959 100644
--- a/app/MindWork AI Studio/Provider/OpenAI/ProviderOpenAI.cs	
+++ b/app/MindWork AI Studio/Provider/OpenAI/ProviderOpenAI.cs	
@@ -176,7 +176,7 @@ public sealed class ProviderOpenAI() : BaseProvider(LLMProviders.OPEN_AI, new Ur
 
         var toolExecutor = Program.SERVICE_PROVIDER.GetService<ToolExecutor>();
         var currentAssistantContent = chatThread.Blocks.LastOrDefault(x => x.Role is ChatRole.AI)?.Content as ContentText;
-        currentAssistantContent?.ToolInvocations.Clear();
+        currentAssistantContent?.BeginToolRun();
 
         IReadOnlyList<(ToolDefinition Definition, IToolImplementation Implementation)> runnableTools = toolRegistry is null
             ? []
diff --git a/app/MindWork AI Studio/Tools/AIJobs/AIJobService.cs b/app/MindWork AI Studio/Tools/AIJobs/AIJobService.cs
index e48747da..60589a80 100644
--- a/app/MindWork AI Studio/Tools/AIJobs/AIJobService.cs	
+++ b/app/MindWork AI Studio/Tools/AIJobs/AIJobService.cs	
@@ -309,6 +309,7 @@ public sealed class AIJobService(SettingsManager settingsManager, MessageBus mes
         aiText.InitialRemoteWait = false;
         aiText.IsStreaming = false;
         aiText.Text = aiText.Text.RemoveThinkTags().Trim();
+        aiText.EndToolRun();
 
         RemoveEmptyAIResponse(state);
 
diff --git a/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoop.cs b/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoop.cs
index e9c897eb..c169dba7 100644
--- a/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoop.cs	
+++ b/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoop.cs	
@@ -114,6 +114,7 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
                 // The model's turn has to be recorded before its results, or the provider sees
                 // results for a turn it does not know about:
                 adapter.RecordAssistantTurn();
+                await context.PublishPendingToolConversationAsync(adapter);
 
                 foreach (var call in round.Calls)
                 {
@@ -124,6 +125,7 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
                         toolResultCharacterCount += invalidContent.Length;
                         await context.AddToolInvocationAsync(invalidTrace);
                         adapter.RecordToolResult(call.CallId, invalidContent, isError: true);
+                        await context.PublishPendingToolConversationAsync(adapter);
                         continue;
                     }
 
@@ -135,6 +137,7 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
                     if (callsUnavailableInstruction is not null)
                     {
                         adapter.RecordToolResult(call.CallId, callsUnavailableInstruction);
+                        await context.PublishPendingToolConversationAsync(adapter);
                         continue;
                     }
 
@@ -156,6 +159,7 @@ public sealed class ToolCallingLoop(ILogger<ToolCallingLoop> logger) : IToolCall
                     // A blocked call counts as a failure towards the model as much as an errored
                     // one does: in both cases it did not get the data it asked for.
                     adapter.RecordToolResult(call.CallId, toolContent, trace.Status is not ToolInvocationTraceStatus.SUCCESS);
+                    await context.PublishPendingToolConversationAsync(adapter);
                 }
             }
             finally
diff --git a/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoopContext.cs b/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoopContext.cs
index 49a1b19a..70d1292c 100644
--- a/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoopContext.cs	
+++ b/app/MindWork AI Studio/Tools/ToolCallingSystem/Harness/ToolCallingLoopContext.cs	
@@ -58,6 +58,24 @@ public sealed class ToolCallingLoopContext
         await this.CurrentAssistantContent.StreamingEvent();
     }
 
+    /// <summary>
+    /// Hands the conversation the adapter has accumulated to the assistant message.
+    /// </summary>
+    /// <remarks>
+    /// Called after every recording, not once per round: a round which reads five web pages is the
+    /// one during which the request grows the most, and a number which only moves between rounds
+    /// would stand still through exactly that.
+    /// </remarks>
+    /// <param name="adapter">The adapter of this run, which knows what it has recorded.</param>
+    public async Task PublishPendingToolConversationAsync(IToolCallingProviderAdapter adapter)
+    {
+        if (this.CurrentAssistantContent is null)
+            return;
+
+        this.CurrentAssistantContent.PendingToolConversation = [..adapter.RecordedRequestTexts];
+        await this.CurrentAssistantContent.StreamingEvent();
+    }
+
     /// <summary>
     /// Tells the UI that the named tools are running.
     /// </summary>