Add Memory Gateway agent plugin

plugins/memory-gateway-agent/tests/test_safety.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from memory_gateway_plugin.safety import detect_large_log, sanitize_memory_content, validate_memory_write
+
+
+def test_safety_rejects_private_key():
+    content = "-----BEGIN PRIVATE KEY-----\nabc\n-----END PRIVATE KEY-----"
+    result = validate_memory_write(content)
+
+    assert result["allowed"] is False
+    assert result["reason"] == "secret_like_content"
+
+
+def test_safety_rejects_large_log():
+    content = "\n".join(f"2026-05-06 10:00:{i:02d} ERROR failure" for i in range(10))
+    blocked, reason = detect_large_log(content)
+
+    assert blocked is True
+    assert reason == "large_or_raw_log"
+
+
+def test_safety_sanitizes_secret_when_called_directly():
+    assert "sk-test" not in sanitize_memory_content("api_key=sk-test")
+