diff --git a/Libraries/PyKotor/tests/test_tools/test_resource_json_progress.py b/Libraries/PyKotor/tests/test_tools/test_resource_json_progress.py
new file mode 100644
index 000000000..71fb8258e
--- /dev/null
+++ b/Libraries/PyKotor/tests/test_tools/test_resource_json_progress.py
@@ -0,0 +1,91 @@
+"""Regression tests for installation JSON export progress (CI vs TTY behavior)."""
+
+from __future__ import annotations
+
+import io
+
+import pytest
+
+from pykotor.tools.resource_json import (
+    _ExportProgressReporter,
+    _format_progress_bar,
+    _supports_live_progress,
+)
+
+
+class _ListLogger:
+    """Minimal logger surface for ``_ExportProgressReporter`` (avoids RobustLogger singleton)."""
+
+    def __init__(self) -> None:
+        self.messages: list[str] = []
+
+    def info(self, message: str, *args: object) -> None:
+        self.messages.append(message % args if args else message)
+
+
+class _FakeTTYStream(io.StringIO):
+    def isatty(self) -> bool:  # noqa: D401
+        return True
+
+
+def test_format_progress_bar_clamps_percent() -> None:
+    assert "#" not in _format_progress_bar(-1.0)
+    assert _format_progress_bar(200.0) == _format_progress_bar(100.0)
+
+
+@pytest.mark.parametrize(
+    ("env_name", "env_value"),
+    [
+        ("CI", "true"),
+        ("CI", "1"),
+        ("CI", " YES "),
+        ("GITHUB_ACTIONS", "true"),
+        ("GITHUB_ACTIONS", "1"),
+    ],
+)
+def test_supports_live_progress_false_in_automation_env(
+    monkeypatch: pytest.MonkeyPatch, env_name: str, env_value: str
+) -> None:
+    monkeypatch.delenv("CI", raising=False)
+    monkeypatch.delenv("GITHUB_ACTIONS", raising=False)
+    monkeypatch.setenv(env_name, env_value)
+    stream = _FakeTTYStream()
+    assert _supports_live_progress(stream) is False
+
+
+def test_supports_live_progress_false_without_tty(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.delenv("CI", raising=False)
+    monkeypatch.delenv("GITHUB_ACTIONS", raising=False)
+    stream = io.StringIO()
+    assert stream.isatty() is False
+    assert _supports_live_progress(stream) is False
+
+
+def test_supports_live_progress_true_for_tty_outside_ci(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.delenv("CI", raising=False)
+    monkeypatch.delenv("GITHUB_ACTIONS", raising=False)
+    assert _supports_live_progress(_FakeTTYStream()) is True
+
+
+def test_export_progress_reporter_logs_to_logger_when_ci_disables_live_updates(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Regression: CI must not use carriage-return stderr spam; aggregators need logger.info."""
+    monkeypatch.setenv("CI", "true")
+    logger = _ListLogger()
+    stream = _FakeTTYStream()
+    reporter = _ExportProgressReporter(logger, total_resources=4, stream=stream)
+    assert reporter.live_updates is False
+
+    reporter.update(1, "a")
+    reporter.update(2, "b")
+    reporter.finish()
+
+    messages = logger.messages
+    assert any("25.00% Writing a" in m for m in messages)
+    assert any("50.00% Writing b" in m for m in messages)
+    assert stream.getvalue() == ""