Prompt history: list preview shows the message as written, not the engine's time line (#660)

Version 0.1.13.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/ClawdDotNet.Core/Engine/AgentEngine.cs

@@ -217,7 +217,7 @@ public sealed class AgentEngine : IAgentMessageRouter, Staging.IFrozenCallExecut
                 messages.Add(ChatMessage.System(systemPrompt));
 
             messages.Add(ChatMessage.User(MitZeit(userMessage, source)));
-            recorder.Begin(systemPrompt, messages[^1].Content?.ToString() ?? userMessage);
+            recorder.Begin(systemPrompt, messages[^1].Content ?? userMessage, userMessage);
 
             string? finalMessage = null;
             var truncated = false;
@@ -556,7 +556,8 @@ public sealed class AgentEngine : IAgentMessageRouter, Staging.IFrozenCallExecut
             AddChatEntry(agentConfig.AgentId, "user", userMessage, source);
             recorder.Begin(
                 messages.Count > 0 && messages[0].Role == "system" ? messages[0].Content?.ToString() : null,
-                messages[^1].Content?.ToString() ?? userMessage);
+                messages[^1].Content ?? userMessage,
+                userMessage);
 
             string? finalMessage = null;
             var truncated = false;

src/ClawdDotNet.Core/Transcripts/RunTranscript.cs

@@ -64,6 +64,10 @@ public sealed record RunTranscript
     public DateTime? CompletedAt { get; init; }
     public string Status { get; init; } = "";
     public string? SystemPromptHash { get; init; }
+
+    /// <summary>The task or message as written, for lists. Falls back to the first user entry.</summary>
+    public string? PromptPreview { get; init; }
+
     public IReadOnlyList<TranscriptEntry> Entries { get; init; } = [];
 
     /// <summary>Characters stored, after clipping.</summary>

src/ClawdDotNet.Core/Transcripts/RunTranscriptRecorder.cs

@@ -34,6 +34,9 @@ public sealed class RunTranscriptRecorder
 
     public bool Enabled { get; }
     public string? SystemPrompt { get; private set; }
+
+    /// <summary>The message as sent by its author - without the time line the engine prepends.</summary>
+    public string? PromptPreview { get; private set; }
     public DateTime StartedAt { get; }
 
     public RunTranscriptRecorder(bool enabled = true, TimeProvider? clock = null)
@@ -45,11 +48,14 @@ public sealed class RunTranscriptRecorder
 
     // ─── Engine hooks ───
 
-    public void Begin(string? systemPrompt, string userMessage)
+    /// <param name="sentMessage">What the model received, including what the engine added.</param>
+    /// <param name="originalMessage">The message as its author wrote it - the list preview.</param>
+    public void Begin(string? systemPrompt, string sentMessage, string? originalMessage = null)
     {
         if (!Enabled) return;
         SystemPrompt = string.IsNullOrWhiteSpace(systemPrompt) ? null : SecretScrubber.Scrub(systemPrompt);
-        Add(TranscriptEntryKind.User, userMessage, MaxTextChars);
+        PromptPreview = SecretScrubber.Scrub(originalMessage ?? sentMessage);
+        Add(TranscriptEntryKind.User, sentMessage, MaxTextChars);
     }
 
     /// <summary>A message the engine sent on its own (follow-up after an empty answer etc.).</summary>
@@ -127,6 +133,7 @@ public sealed class RunTranscriptRecorder
                 CompletedAt = _clock.GetUtcNow().UtcDateTime,
                 Status = status,
                 SystemPromptHash = SystemPrompt is null ? null : Hash(SystemPrompt),
+                PromptPreview = PromptPreview,
                 Entries = _entries.ToList(),
                 SizeChars = _size,
                 Truncated = _truncated

src/ClawdDotNet.Core/Transcripts/SqliteRunTranscriptStore.cs

@@ -69,7 +69,7 @@ public sealed class SqliteRunTranscriptStore(SqliteStorage storage) : IRunTransc
             cmd.Parameters.AddWithValue("@completed", t.CompletedAt is { } c ? Format(c) : DBNull.Value);
             cmd.Parameters.AddWithValue("@status", t.Status);
             cmd.Parameters.AddWithValue("@hash", (object?)t.SystemPromptHash ?? DBNull.Value);
-            cmd.Parameters.AddWithValue("@prompt", Snippet(t.Entries.FirstOrDefault(e => e.Kind == TranscriptEntryKind.User)?.Text));
+            cmd.Parameters.AddWithValue("@prompt", Snippet(t.PromptPreview ?? t.Entries.FirstOrDefault(e => e.Kind == TranscriptEntryKind.User)?.Text));
             cmd.Parameters.AddWithValue("@response", Snippet(t.Entries.LastOrDefault(e => e.Kind == TranscriptEntryKind.Assistant && !string.IsNullOrWhiteSpace(e.Text))?.Text));
             cmd.Parameters.AddWithValue("@entries", JsonSerializer.Serialize(t.Entries, Json));
             cmd.Parameters.AddWithValue("@size", t.SizeChars);