Fix settings log tail reads

MeetingAssistant.Tests/WorkflowRulesEditorTests.cs

@@ -155,15 +155,18 @@ public sealed class WorkflowRulesEditorTests
             new MeetingAssistantOptions(),
             logDirectory: root);
 
+        using var provider = new MeetingAssistantFileLoggerProvider(root);
+        provider.CreateLogger("Test").LogInformation("locked needle");
+
         var tail = await tools.ReadLogs(tail: 2);
-        var range = await tools.ReadLogs(from: 2, to: 2);
+        var range = await tools.ReadLogs(from: 1, to: 1);
         var search = await tools.SearchLogs("needle");
 
-        Assert.DoesNotContain("first line", tail);
-        Assert.Contains("second needle", tail);
-        Assert.Equal("second needle", range.Trim());
-        Assert.Contains("meeting-assistant.log:2 second needle", search);
-        Assert.Contains("meeting-assistant.log.1:1 rotated needle", search);
+        Assert.Contains("locked needle", tail);
+        Assert.Contains("locked needle", search);
+        Assert.Contains("locked needle", range);
+        Assert.Contains("meeting-assistant.log:1", search);
+        Assert.Contains("meeting-assistant.log.2:1 rotated needle", search);
     }
 
     [Fact]

MeetingAssistant/AgentFileToolContent.cs

@@ -189,7 +189,7 @@ internal static class AgentFileToolContent
             var limit = Math.Clamp(maxMatches, 1, 1000);
             foreach (var source in sources)
             {
-                var lines = File.ReadAllLines(source.Path);
+                var lines = ReadAllLinesShared(source.Path);
                 for (var index = 0; index < lines.Length; index++)
                 {
                     if (regex.IsMatch(lines[index]))
@@ -211,6 +211,30 @@ internal static class AgentFileToolContent
             return "";
         }
     }
+
+    public static async Task<string> ReadAllTextSharedAsync(string path)
+    {
+        await using var stream = new FileStream(
+            path,
+            FileMode.Open,
+            FileAccess.Read,
+            FileShare.ReadWrite | FileShare.Delete,
+            bufferSize: 4096,
+            useAsync: true);
+        using var reader = new StreamReader(stream);
+        return await reader.ReadToEndAsync();
+    }
+
+    private static string[] ReadAllLinesShared(string path)
+    {
+        using var stream = new FileStream(
+            path,
+            FileMode.Open,
+            FileAccess.Read,
+            FileShare.ReadWrite | FileShare.Delete);
+        using var reader = new StreamReader(stream);
+        return SplitLines(reader.ReadToEnd()).ToArray();
+    }
 }
 
 internal sealed record AgentFileSearchSource(string Path, string DisplayPath);

MeetingAssistant/Workflow/WorkflowRulesEditorTools.cs

@@ -166,7 +166,7 @@ public sealed class WorkflowRulesEditorTools
             return $"Log file was not found: {logFile ?? MeetingAssistantLogFiles.CurrentLogFileName}";
         }
 
-        var content = await File.ReadAllTextAsync(path);
+        var content = await AgentFileToolContent.ReadAllTextSharedAsync(path);
         if (from.HasValue || to.HasValue)
         {
             return AgentFileToolContent.ReadLines(content, from, to);