diff --git a/internal/mcpserver/server.go b/internal/mcpserver/server.go
index 9d49c84..279c902 100644
--- a/internal/mcpserver/server.go
+++ b/internal/mcpserver/server.go
@@ -341,7 +341,9 @@ func (r Runner) handleInitialize(encoder *json.Encoder, session *runnerSession,
 	return writeRPCResult(encoder, request.ID, map[string]any{
 		"protocolVersion": negotiatedVersion,
 		"capabilities": map[string]any{
-			"tools": map[string]any{},
+			"tools": map[string]any{
+				"listChanged": true,
+			},
 		},
 		"serverInfo": map[string]any{
 			"name":    mcpServerName,
diff --git a/internal/mcpserver/server_test.go b/internal/mcpserver/server_test.go
index 1039920..9cf1e17 100644
--- a/internal/mcpserver/server_test.go
+++ b/internal/mcpserver/server_test.go
@@ -227,6 +227,13 @@ func TestRunnerRunWritesToolManifestAndHandlesRequests(t *testing.T) {
 	if _, ok := initializeResponse.Result.Capabilities["tools"]; !ok {
 		t.Fatalf("expected tools capability, got %#v", initializeResponse.Result.Capabilities)
 	}
+	toolsCapability, ok := initializeResponse.Result.Capabilities["tools"].(map[string]any)
+	if !ok {
+		t.Fatalf("expected tools capability object, got %#v", initializeResponse.Result.Capabilities["tools"])
+	}
+	if listChanged, ok := toolsCapability["listChanged"].(bool); !ok || !listChanged {
+		t.Fatalf("expected tools.listChanged=true, got %#v", toolsCapability)
+	}
 	if initializeResponse.Result.ServerInfo.Name == "" || initializeResponse.Result.ServerInfo.Version == "" {
 		t.Fatalf("expected server info, got %#v", initializeResponse.Result.ServerInfo)
 	}