diff --git a/src/Polyphony/Commands/BranchCommands.cs b/src/Polyphony/Commands/BranchCommands.cs
index aad8ef9..d3337ad 100644
--- a/src/Polyphony/Commands/BranchCommands.cs
+++ b/src/Polyphony/Commands/BranchCommands.cs
@@ -209,9 +209,11 @@ private static IReadOnlyList<int> ExtractPredecessors(JsonNode item)
 
     private static (string State, string Title) ExtractStateAndTitle(JsonNode item)
     {
-        var fields = item["fields"];
-        var state = fields?["System.State"]?.GetValue<string>() ?? string.Empty;
-        var title = fields?["System.Title"]?.GetValue<string>() ?? string.Empty;
+        // twig >= v0.81.0 promotes state/title to top-level cells on
+        // `twig show --output json`. The fields[] subobject no longer
+        // redundantly carries System.State / System.Title.
+        var state = item["state"]?.GetValue<string>() ?? string.Empty;
+        var title = item["title"]?.GetValue<string>() ?? string.Empty;
         return (state, title);
     }
 
diff --git a/src/Polyphony/Commands/PrCommands.OpenEvidencePr.cs b/src/Polyphony/Commands/PrCommands.OpenEvidencePr.cs
index 4683101..970cbfe 100644
--- a/src/Polyphony/Commands/PrCommands.OpenEvidencePr.cs
+++ b/src/Polyphony/Commands/PrCommands.OpenEvidencePr.cs
@@ -329,7 +329,9 @@ private async Task<string> ResolveEvidencePrTitleAsync(int workItem, Cancellatio
         try
         {
             var tree = await twig.ShowTreeAsync(workItem, ct).ConfigureAwait(false);
-            var workItemTitle = tree?["title"]?.GetValue<string>();
+            // twig >= v0.81.0 tree root is {parentChain, focus, children, …};
+            // the active item's title lives under `focus`.
+            var workItemTitle = tree?["focus"]?["title"]?.GetValue<string>();
             return string.IsNullOrWhiteSpace(workItemTitle)
                 ? fallback
                 : $"Evidence: {workItemTitle} (#{workItem})";
diff --git a/src/Polyphony/Commands/PrCommands.OpenImplPr.cs b/src/Polyphony/Commands/PrCommands.OpenImplPr.cs
index ffa7da3..b60ff28 100644
--- a/src/Polyphony/Commands/PrCommands.OpenImplPr.cs
+++ b/src/Polyphony/Commands/PrCommands.OpenImplPr.cs
@@ -325,7 +325,9 @@ private async Task<string> ResolveImplPrTitleAsync(int itemId, CancellationToken
         try
         {
             var tree = await twig.ShowTreeAsync(itemId, ct).ConfigureAwait(false);
-            var workItemTitle = tree?["title"]?.GetValue<string>();
+            // twig >= v0.81.0 tree root is {parentChain, focus, children, …};
+            // the active item's title lives under `focus`.
+            var workItemTitle = tree?["focus"]?["title"]?.GetValue<string>();
             return string.IsNullOrWhiteSpace(workItemTitle) ? fallback : $"{workItemTitle} AB#{itemId}";
         }
         catch
diff --git a/src/Polyphony/Commands/PrCommands.OpenPlanPr.cs b/src/Polyphony/Commands/PrCommands.OpenPlanPr.cs
index 9382c9b..cf13579 100644
--- a/src/Polyphony/Commands/PrCommands.OpenPlanPr.cs
+++ b/src/Polyphony/Commands/PrCommands.OpenPlanPr.cs
@@ -526,7 +526,9 @@ private async Task<string> ResolvePlanPrTitleAsync(int itemId, bool isRootPlan,
         try
         {
             var tree = await twig.ShowTreeAsync(itemId, ct).ConfigureAwait(false);
-            var workItemTitle = tree?["title"]?.GetValue<string>();
+            // twig >= v0.81.0 tree root is {parentChain, focus, children, …};
+            // the active item's title lives under `focus`.
+            var workItemTitle = tree?["focus"]?["title"]?.GetValue<string>();
             if (string.IsNullOrWhiteSpace(workItemTitle)) return fallback;
             return $"plan: {workItemTitle} AB#{itemId}";
         }
diff --git a/src/Polyphony/Commands/PrCommands.cs b/src/Polyphony/Commands/PrCommands.cs
index df58626..443540d 100644
--- a/src/Polyphony/Commands/PrCommands.cs
+++ b/src/Polyphony/Commands/PrCommands.cs
@@ -268,7 +268,9 @@ private async Task<string> ResolvePrTitleAsync(int workItem, CancellationToken c
         try
         {
             var tree = await twig.ShowTreeAsync(workItem, ct).ConfigureAwait(false);
-            var title = tree?["title"]?.GetValue<string>();
+            // twig >= v0.81.0 tree root is {parentChain, focus, children, …};
+            // the active item's title lives under `focus`.
+            var title = tree?["focus"]?["title"]?.GetValue<string>();
             return string.IsNullOrWhiteSpace(title) ? fallback : $"feat: {title} AB#{workItem}";
         }
         catch
diff --git a/tests/Polyphony.Tests/Commands/BranchCommandsCheckDepsTests.cs b/tests/Polyphony.Tests/Commands/BranchCommandsCheckDepsTests.cs
index 7ae9212..e7ec941 100644
--- a/tests/Polyphony.Tests/Commands/BranchCommandsCheckDepsTests.cs
+++ b/tests/Polyphony.Tests/Commands/BranchCommandsCheckDepsTests.cs
@@ -74,8 +74,8 @@ public async Task CheckDeps_AllPredecessorsTerminal_EmitsNotBlocked()
               ]
             }
             """);
-        StubShow(runner, 200, """{"id":200,"fields":{"System.State":"Done","System.Title":"Pred A"}}""");
-        StubShow(runner, 201, """{"id":201,"fields":{"System.State":"Closed","System.Title":"Pred B"}}""");
+        StubShow(runner, 200, """{"id":200,"state":"Done","title":"Pred A"}""");
+        StubShow(runner, 201, """{"id":201,"state":"Closed","title":"Pred B"}""");
 
         var (exit, output) = await CaptureConsoleAsync(() => cmd.CheckDeps(100));
 
@@ -103,9 +103,9 @@ public async Task CheckDeps_PartiallyBlocked_EmitsBlockedListWithPendingItems()
               ]
             }
             """);
-        StubShow(runner, 200, """{"id":200,"fields":{"System.State":"Done","System.Title":"Pred A"}}""");
-        StubShow(runner, 201, """{"id":201,"fields":{"System.State":"Doing","System.Title":"Pred B"}}""");
-        StubShow(runner, 202, """{"id":202,"fields":{"System.State":"To Do","System.Title":"Pred C"}}""");
+        StubShow(runner, 200, """{"id":200,"state":"Done","title":"Pred A"}""");
+        StubShow(runner, 201, """{"id":201,"state":"Doing","title":"Pred B"}""");
+        StubShow(runner, 202, """{"id":202,"state":"To Do","title":"Pred C"}""");
 
         var (exit, output) = await CaptureConsoleAsync(() => cmd.CheckDeps(100));
 
@@ -133,7 +133,7 @@ public async Task CheckDeps_PredecessorsByAttributesName_AlsoCounted()
               ]
             }
             """);
-        StubShow(runner, 300, """{"id":300,"fields":{"System.State":"Done","System.Title":"Pred X"}}""");
+        StubShow(runner, 300, """{"id":300,"state":"Done","title":"Pred X"}""");
 
         var (_, output) = await CaptureConsoleAsync(() => cmd.CheckDeps(100));
         var result = Deserialize(output);
diff --git a/tests/Polyphony.Tests/Commands/PrCommandsJournalTests.cs b/tests/Polyphony.Tests/Commands/PrCommandsJournalTests.cs
index 4028167..6b84317 100644
--- a/tests/Polyphony.Tests/Commands/PrCommandsJournalTests.cs
+++ b/tests/Polyphony.Tests/Commands/PrCommandsJournalTests.cs
@@ -657,7 +657,7 @@ private static void StubLsRemoteHas(FakeProcessRunner runner, string remote, str
 
     private static void StubTwigShowTree(FakeProcessRunner runner, int id, string? title)
     {
-        var json = title is null ? "" : $$"""{"title":"{{title}}","id":{{id}}}""";
+        var json = title is null ? "" : $$$"""{"focus":{"title":"{{{title}}}","id":{{{id}}}}}""";
         runner.WhenExact("twig", ["show", id.ToString(), "--tree", "--output", "json"],
             new ProcessResult(title is null ? 1 : 0, json, ""));
     }
diff --git a/tests/Polyphony.Tests/Commands/PrCommandsOpenImplPrTests.cs b/tests/Polyphony.Tests/Commands/PrCommandsOpenImplPrTests.cs
index 4dd644d..f62df28 100644
--- a/tests/Polyphony.Tests/Commands/PrCommandsOpenImplPrTests.cs
+++ b/tests/Polyphony.Tests/Commands/PrCommandsOpenImplPrTests.cs
@@ -32,7 +32,7 @@ private static void StubLsRemoteHas(FakeProcessRunner runner, string pattern, bo
 
     private static void StubTwigShowTree(FakeProcessRunner runner, int id, string? title)
     {
-        var json = title is null ? "" : $$"""{"title":"{{title}}","id":{{id}}}""";
+        var json = title is null ? "" : $$$"""{"focus":{"title":"{{{title}}}","id":{{{id}}}}}""";
         runner.WhenExact("twig", ["show", id.ToString(), "--tree", "--output", "json"],
             new ProcessResult(title is null ? 1 : 0, json, ""));
     }
diff --git a/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanAdoTests.cs b/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanAdoTests.cs
index 9d6da7f..bff243b 100644
--- a/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanAdoTests.cs
+++ b/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanAdoTests.cs
@@ -72,7 +72,7 @@ private static void StubManifestMissing(FakeProcessRunner runner, int rootId, st
 
     private static void StubTwigShow(FakeProcessRunner runner, int id, string? title)
     {
-        var json = title is null ? "" : $$"""{"title":"{{title}}","id":{{id}}}""";
+        var json = title is null ? "" : $$$"""{"focus":{"title":"{{{title}}}","id":{{{id}}}}}""";
         runner.WhenExact("twig", ["show", id.ToString(), "--tree", "--output", "json"],
             new ProcessResult(title is null ? 1 : 0, json, ""));
     }
diff --git a/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanPrTests.cs b/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanPrTests.cs
index 00f56e6..8c35a21 100644
--- a/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanPrTests.cs
+++ b/tests/Polyphony.Tests/Commands/PrCommandsOpenPlanPrTests.cs
@@ -67,7 +67,7 @@ private static void StubGitOriginUrl(FakeProcessRunner runner, string url)
 
     private static void StubTwigShow(FakeProcessRunner runner, int id, string? title)
     {
-        var json = title is null ? "" : $$"""{"title":"{{title}}","id":{{id}}}""";
+        var json = title is null ? "" : $$$"""{"focus":{"title":"{{{title}}}","id":{{{id}}}}}""";
         runner.WhenExact("twig", ["show", id.ToString(), "--tree", "--output", "json"],
             new ProcessResult(title is null ? 1 : 0, json, ""));
     }
diff --git a/tests/Polyphony.Tests/Commands/PrCommandsTests.cs b/tests/Polyphony.Tests/Commands/PrCommandsTests.cs
index 0ac1cf4..d50939b 100644
--- a/tests/Polyphony.Tests/Commands/PrCommandsTests.cs
+++ b/tests/Polyphony.Tests/Commands/PrCommandsTests.cs
@@ -28,7 +28,7 @@ private static void StubLsRemoteHas(FakeProcessRunner runner, string remote, str
 
     private static void StubTwigShowTree(FakeProcessRunner runner, int id, string? title)
     {
-        var json = title is null ? "" : $$"""{"title":"{{title}}","id":{{id}}}""";
+        var json = title is null ? "" : $$$"""{"focus":{"title":"{{{title}}}","id":{{{id}}}}}""";
         runner.WhenExact("twig", new[] { "show", id.ToString(), "--tree", "--output", "json" },
             new ProcessResult(title is null ? 1 : 0, json, ""));
     }
diff --git a/tests/Polyphony.Tests/Commands/PrOpenEvidenceTests.cs b/tests/Polyphony.Tests/Commands/PrOpenEvidenceTests.cs
index cfb7f87..e42e1ad 100644
--- a/tests/Polyphony.Tests/Commands/PrOpenEvidenceTests.cs
+++ b/tests/Polyphony.Tests/Commands/PrOpenEvidenceTests.cs
@@ -38,7 +38,7 @@ private static void StubLsRemoteHas(FakeProcessRunner runner, string pattern, bo
 
     private static void StubTwigShowTree(FakeProcessRunner runner, int id, string? title)
     {
-        var json = title is null ? "" : $$"""{"title":"{{title}}","id":{{id}}}""";
+        var json = title is null ? "" : $$$"""{"focus":{"title":"{{{title}}}","id":{{{id}}}}}""";
         runner.WhenExact("twig", ["show", id.ToString(), "--tree", "--output", "json"],
             new ProcessResult(title is null ? 1 : 0, json, ""));
     }