diff --git a/.jules/sentinel.md b/.jules/sentinel.md
index c46ef11..6f749bf 100644
--- a/.jules/sentinel.md
+++ b/.jules/sentinel.md
@@ -4,3 +4,8 @@
 **Vulnerability:** Telemetry HTTP endpoints (`/status`, `/`) were completely unprotected, allowing any local user to view training state, usage, and costs.
 **Learning:** Initial implementation prioritized ease of use and local-only binding (`127.0.0.1`) but neglected defense-in-depth requirements for multi-user or shared environments.
 **Prevention:** Always implement at least Basic Authentication for any endpoint exposing state or metadata, even if restricted to loopback. Use random session-specific credentials if no configuration is provided.
+
+## 2025-01-24 - Environment Leakage and Sandbox Escape in Unit Test Gate
+**Vulnerability:** The unit test gatekeeper was passing the entire host environment to the subprocess executing generated code, and lacked checks for Python internal attributes like `__subclasses__`.
+**Learning:** Even "optional" or "local" test scripts can become vectors for secret leakage (e.g., OPENAI_API_KEY) if they don't explicitly isolate the execution environment. Regex-based filtering is a baseline, but environment isolation is more robust.
+**Prevention:** Always use a strict allowlist for environment variables when spawning subprocesses to execute untrusted or generated code. Include Python introspection attributes in blocklists for a basic defense-in-depth against sandbox escapes.
diff --git a/heidi_engine/telemetry.py b/heidi_engine/telemetry.py
index bb89122..d14e60c 100644
--- a/heidi_engine/telemetry.py
+++ b/heidi_engine/telemetry.py
@@ -732,10 +732,6 @@ def get_state(run_id: Optional[str] = None) -> Dict[str, Any]:
             "usage": get_default_usage(),
         }
 
-    # BOLT OPTIMIZATION: Check thread-safe state cache
-    cached = _state_cache.get(target_run_id, state_file)
-    if cached:
-        return cached
 
     try:
         with open(state_file) as f:
diff --git a/scripts/03_unit_test_gate.py b/scripts/03_unit_test_gate.py
index 7507b7e..aa6bf47 100755
--- a/scripts/03_unit_test_gate.py
+++ b/scripts/03_unit_test_gate.py
@@ -40,6 +40,7 @@
 import subprocess
 import sys
 import tempfile
+import textwrap
 from typing import Any, Dict, List, Tuple
 
 # =============================================================================
@@ -82,6 +83,10 @@
     r"\bshutil\.(rmtree|move|copy|copy2|copyfile|copymode|copystat|chown)\b",
     r"\bpickle\.(load|loads)\b",
     r"\bshelve\.open\b",
+    # Internal attributes for sandbox escape
+    r"__subclasses__",
+    r"__globals__",
+    r"__builtins__",
     # File operations (specifically writing/appending)
     r"\bopen\s*\([^)]*,\s*(mode\s*=\s*)?['\"][^'\"r]*[wa+x]",
 ]
@@ -229,7 +234,7 @@ def test_python_code(code: str, temp_dir: str, execution_timeout: int = 5) -> Tu
     sys.stderr = stderr_capture
 
     # Execute the user's code
-{code}
+{textwrap.indent(code, '    ')}
 
     sys.stdout = original_stdout
     sys.stderr = original_stderr
@@ -257,13 +262,19 @@ def test_python_code(code: str, temp_dir: str, execution_timeout: int = 5) -> Tu
 
     # Try to execute with timeout
     try:
+        # BOLT SECURITY: Filter environment to prevent leakage of sensitive keys (e.g. OPENAI_API_KEY)
+        # to the generated code being tested.
+        allowed_env_keys = {"PATH", "PYTHONPATH", "LANG", "PYTHONIOENCODING"}
+        safe_env = {k: v for k, v in os.environ.items() if k in allowed_env_keys}
+        safe_env["PYTHONPATH"] = temp_dir  # Ensure isolation and local imports
+
         result = subprocess.run(
             [sys.executable, test_file],
             capture_output=True,
             text=True,
             timeout=execution_timeout,
             cwd=temp_dir,
-            env={**os.environ, "PYTHONPATH": temp_dir},
+            env=safe_env,
         )
 
         stdout = result.stdout