diff --git a/aas-gym/src/aas_gym/aas_config.py b/aas-gym/src/aas_gym/aas_config.py
new file mode 100644
index 00000000..6091d751
--- /dev/null
+++ b/aas-gym/src/aas_gym/aas_config.py
@@ -0,0 +1,58 @@
+"""Pure AASEnv configuration validators (no Docker/ROS imports)."""
+
+from __future__ import annotations
+import math
+
+ALLOWED_AUTOPILOTS = frozenset({"px4", "ardupilot"})
+ALLOWED_ODOM = frozenset({"none", "openvins", "fastlio", "superodom", "mimosa"})
+ALLOWED_RENDER_MODES = frozenset({None, "human", "ansi"})
+
+
+def validate_aas_config(
+    *,
+    instance: int = 0,
+    gym_freq_hz: int = 50,
+    autopilot: str = "px4",
+    odom: str = "none",
+    num_quads: int = 1,
+    render_mode=None,
+) -> dict:
+    """Validate constructor knobs; raise ValueError on bad input.
+
+    Returns a normalized dict of the checked fields.
+    """
+    if isinstance(instance, bool) or not isinstance(instance, int) or instance < 0:
+        raise ValueError(f"instance must be a non-negative int, got {instance!r}")
+    if isinstance(gym_freq_hz, bool) or not isinstance(gym_freq_hz, int) or gym_freq_hz < 1:
+        raise ValueError(f"gym_freq_hz must be an int >= 1, got {gym_freq_hz!r}")
+    if autopilot not in ALLOWED_AUTOPILOTS:
+        raise ValueError(f"autopilot must be one of {sorted(ALLOWED_AUTOPILOTS)}, got {autopilot!r}")
+    if odom not in ALLOWED_ODOM:
+        raise ValueError(f"odom must be one of {sorted(ALLOWED_ODOM)}, got {odom!r}")
+    if isinstance(num_quads, bool) or not isinstance(num_quads, int) or num_quads < 1:
+        raise ValueError(f"num_quads must be an int >= 1, got {num_quads!r}")
+    if render_mode not in ALLOWED_RENDER_MODES:
+        raise ValueError(f"render_mode must be one of human/ansi/None, got {render_mode!r}")
+    return {
+        "instance": instance,
+        "gym_freq_hz": gym_freq_hz,
+        "autopilot": autopilot,
+        "odom": odom,
+        "num_quads": num_quads,
+        "render_mode": render_mode,
+    }
+
+
+def validate_zmq_transport(transport: str) -> str:
+    if transport not in ("tcp", "ipc"):
+        raise ValueError(f"ZMQ_TRANSPORT must be 'tcp' or 'ipc', got {transport!r}")
+    return transport
+
+
+def finite_episode_seconds(value) -> float:
+    if isinstance(value, bool) or not isinstance(value, (int, float)):
+        raise ValueError(f"seconds must be numeric, got {type(value).__name__}")
+    f = float(value)
+    if not math.isfinite(f) or f <= 0:
+        raise ValueError(f"seconds must be finite and > 0, got {f!r}")
+    return f
diff --git a/aas-gym/src/aas_gym/aas_env.py b/aas-gym/src/aas_gym/aas_env.py
index 738807ce..03e8288a 100644
--- a/aas-gym/src/aas_gym/aas_env.py
+++ b/aas-gym/src/aas_gym/aas_env.py
@@ -11,6 +11,11 @@
 
 from docker.types import DeviceRequest
 
+try:
+    from aas_gym.aas_config import validate_aas_config
+except ImportError:
+    from aas_config import validate_aas_config
+
 
 class AASEnv(gym.Env):
     metadata = {"render_modes": ["human", "ansi"]}
@@ -28,6 +33,15 @@ def __init__(self,
         ):
         super().__init__()
 
+        validate_aas_config(
+            instance=instance,
+            gym_freq_hz=gym_freq_hz,
+            autopilot=autopilot,
+            odom=odom,
+            num_quads=num_quads,
+            render_mode=render_mode,
+        )
+
         self.GYM_FREQ_HZ = gym_freq_hz
         self.GYM_INIT_DURATION = 80.0  # Seconds to run unpaused during reset (seconds)
         self.MAX_EPISODE_LENGTH_SEC = 300.0  # Max episode length in seconds (excluding init duration)
diff --git a/aas-gym/src/aas_gym/test_aas_config.py b/aas-gym/src/aas_gym/test_aas_config.py
new file mode 100644
index 00000000..261dada9
--- /dev/null
+++ b/aas-gym/src/aas_gym/test_aas_config.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+import math
+import unittest
+
+try:
+    from aas_gym.aas_config import (
+        validate_aas_config,
+        validate_zmq_transport,
+        finite_episode_seconds,
+    )
+except ImportError:
+    from aas_config import (
+        validate_aas_config,
+        validate_zmq_transport,
+        finite_episode_seconds,
+    )
+
+
+class TestAasConfig(unittest.TestCase):
+    def test_defaults_ok(self):
+        cfg = validate_aas_config()
+        self.assertEqual(cfg["autopilot"], "px4")
+        self.assertEqual(cfg["num_quads"], 1)
+
+    def test_bad_num_quads(self):
+        with self.assertRaises(ValueError):
+            validate_aas_config(num_quads=0)
+        with self.assertRaises(ValueError):
+            validate_aas_config(num_quads=-1)
+
+    def test_bad_odom(self):
+        with self.assertRaises(ValueError):
+            validate_aas_config(odom="vins-fusion")
+
+    def test_bad_freq(self):
+        with self.assertRaises(ValueError):
+            validate_aas_config(gym_freq_hz=0)
+
+    def test_zmq(self):
+        self.assertEqual(validate_zmq_transport("tcp"), "tcp")
+        with self.assertRaises(ValueError):
+            validate_zmq_transport("udp")
+
+    def test_episode_seconds(self):
+        self.assertEqual(finite_episode_seconds(300), 300.0)
+        for bad in (0, -1, math.nan, math.inf):
+            with self.subTest(bad=bad):
+                with self.assertRaises(ValueError):
+                    finite_episode_seconds(bad)
+
+
+if __name__ == "__main__":
+    unittest.main()