diff --git a/codeagent-wrapper/internal/app/cli.go b/codeagent-wrapper/internal/app/cli.go
index 2ea139e..162e11f 100644
--- a/codeagent-wrapper/internal/app/cli.go
+++ b/codeagent-wrapper/internal/app/cli.go
@@ -545,7 +545,7 @@ func runParallelMode(cmd *cobra.Command, args []string, opts *cliOptions, v *vip
 		results[i].CoverageNum = extractCoverageNum(results[i].Coverage)
 		results[i].FilesChanged = extractFilesChangedFromLines(lines)
 		results[i].TestsPassed, results[i].TestsFailed = extractTestResultsFromLines(lines)
-		results[i].KeyOutput = extractKeyOutputFromLines(lines, 150)
+		results[i].KeyOutput = extractKeyOutputFromLines(lines, 0)
 	}
 
 	if err := writeStructuredOutput(outputPath, results); err != nil {
diff --git a/codeagent-wrapper/internal/app/utils.go b/codeagent-wrapper/internal/app/utils.go
index abec759..55e7145 100644
--- a/codeagent-wrapper/internal/app/utils.go
+++ b/codeagent-wrapper/internal/app/utils.go
@@ -479,11 +479,19 @@ func extractNumberBefore(s string, idx int) int {
 }
 
 // extractKeyOutputFromLines extracts key output from pre-split lines.
+// maxLen=0 means unlimited; maxLen<0 returns "".
 func extractKeyOutputFromLines(lines []string, maxLen int) string {
-	if len(lines) == 0 || maxLen <= 0 {
+	if len(lines) == 0 || maxLen < 0 {
 		return ""
 	}
 
+	mayTruncate := func(s string) string {
+		if maxLen == 0 {
+			return s
+		}
+		return safeTruncate(s, maxLen)
+	}
+
 	// Priority 1: Look for explicit summary lines
 	for _, line := range lines {
 		line = strings.TrimSpace(line)
@@ -498,7 +506,7 @@ func extractKeyOutputFromLines(lines []string, maxLen int) string {
 			}
 			content = strings.TrimSpace(content)
 			if len(content) > 0 {
-				return safeTruncate(content, maxLen)
+				return mayTruncate(content)
 			}
 		}
 	}
@@ -514,10 +522,10 @@ func extractKeyOutputFromLines(lines []string, maxLen int) string {
 		if len(line) < 20 {
 			continue
 		}
-		return safeTruncate(line, maxLen)
+		return mayTruncate(line)
 	}
 
-	// Fallback: truncate entire message
+	// Fallback: return entire message
 	clean := strings.TrimSpace(strings.Join(lines, "\n"))
-	return safeTruncate(clean, maxLen)
+	return mayTruncate(clean)
 }
diff --git a/codeagent-wrapper/internal/app/utils_test.go b/codeagent-wrapper/internal/app/utils_test.go
index 64c3f6b..fd65600 100644
--- a/codeagent-wrapper/internal/app/utils_test.go
+++ b/codeagent-wrapper/internal/app/utils_test.go
@@ -122,6 +122,33 @@ func TestSafeTruncate(t *testing.T) {
 	}
 }
 
+func TestExtractKeyOutputFromLines(t *testing.T) {
+	tests := []struct {
+		name   string
+		lines  []string
+		maxLen int
+		want   string
+	}{
+		{"empty lines returns empty", []string{}, 0, ""},
+		{"negative maxLen returns empty", []string{"hello world"}, -1, ""},
+		{"unlimited: summary prefix returned in full", []string{"Summary: all done with a very long description that exceeds 150 characters and should not be cut off at all"}, 0, "all done with a very long description that exceeds 150 characters and should not be cut off at all"},
+		{"unlimited: first meaningful line returned in full", []string{"this is a meaningful line that is longer than twenty chars and should not be truncated"}, 0, "this is a meaningful line that is longer than twenty chars and should not be truncated"},
+		{"unlimited: skips noise lines", []string{"---", "# heading", "short", "this is a meaningful line longer than twenty chars"}, 0, "this is a meaningful line longer than twenty chars"},
+		{"limited: summary prefix truncated", []string{"Summary: hello world truncated"}, 10, "hello w..."},
+		{"limited: first meaningful line truncated", []string{"this is a long meaningful line that will be truncated"}, 20, "this is a long me..."},
+		{"unlimited: fallback joins all lines", []string{"short", "also short"}, 0, "short\nalso short"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := extractKeyOutputFromLines(tt.lines, tt.maxLen)
+			if got != tt.want {
+				t.Fatalf("extractKeyOutputFromLines(%v, %d) = %q, want %q", tt.lines, tt.maxLen, got, tt.want)
+			}
+		})
+	}
+}
+
 func TestSanitizeOutput(t *testing.T) {
 	tests := []struct {
 		name string