diff --git a/detection/toolmention/toolmention.go b/detection/toolmention/toolmention.go
index 89ef46d..ecd6301 100644
--- a/detection/toolmention/toolmention.go
+++ b/detection/toolmention/toolmention.go
@@ -35,6 +35,7 @@ func init() {
 		"JetBrains AI",
 		"CodeRabbit",
 		"ChatGPT",
+		"t3.chat",
 		"GPT-4",
 		"Windsurf",
 	}
diff --git a/detection/toolmention/toolmention_test.go b/detection/toolmention/toolmention_test.go
index 212aff7..ded6712 100644
--- a/detection/toolmention/toolmention_test.go
+++ b/detection/toolmention/toolmention_test.go
@@ -69,6 +69,21 @@ func TestDetect(t *testing.T) {
 			input:     detection.Input{Text: "I asked ChatGPT for help"},
 			wantTools: []string{"ChatGPT"},
 		},
+		{
+			name:      "t3.chat mention",
+			input:     detection.Input{Text: "I used t3.chat to compare model outputs"},
+			wantTools: []string{"t3.chat"},
+		},
+		{
+			name:      "t3.chat mention is case insensitive",
+			input:     detection.Input{Text: "Generated with T3.CHAT"},
+			wantTools: []string{"t3.chat"},
+		},
+		{
+			name:      "t3.chat word boundary prevents partial match",
+			input:     detection.Input{Text: "This mentions t3.chatty, not the tool"},
+			wantTools: nil,
+		},
 		{
 			name:      "Windsurf mention",
 			input:     detection.Input{Text: "Written with Windsurf IDE"},