diff --git a/src/core/types.py b/src/core/types.py
index 1abb168b..8808e96b 100644
--- a/src/core/types.py
+++ b/src/core/types.py
@@ -15,10 +15,8 @@ class StepResult(Generic[ObsT]):
         observation: The environment's observation after the action.
         reward: Scalar reward for this step (optional).
         done: Whether the episode is finished.
-        info: Additional metadata (e.g. debug info, latency, etc.).
     """
 
     observation: ObsT
     reward: Optional[float] = None
     done: bool = False
-    info: Optional[dict[str, Any]] = None
diff --git a/src/envs/coding_env/env.py b/src/envs/coding_env/env.py
new file mode 100644
index 00000000..c8feb313
--- /dev/null
+++ b/src/envs/coding_env/env.py
@@ -0,0 +1,72 @@
+"""
+envs/coding_env/env.py
+--------------------------------
+Concrete environment implementation using the core BaseEnv.
+POC implementation runs code locally via subprocess that can be changed later.
+"""
+
+from __future__ import annotations
+
+import subprocess
+from typing import Optional
+
+from core.base import BaseEnv
+from core.types import StepResult
+
+from .models import CodeAction, CodeObservation
+
+
+class CodingEnv(BaseEnv[CodeAction, CodeObservation]):
+    """
+    Minimal Coding Environment.
+
+    POC behavior:
+      - reset(): returns a fresh, empty observation (no persistent state).
+      - step(action): runs Python code with `python -c` and returns stdout/stderr/exit_code.
+
+    Future swap:
+      Replace _run_code_locally() with a call to your Docker/gateway backend without
+      changing the public API.
+    """
+
+    def __init__(
+        self,
+        default_timeout_s: float = 10.0,
+        python_executable: str = "python",
+    ):
+        """
+        Args:
+            default_timeout_s: Max seconds to allow code execution before timing out.
+            python_executable: Interpreter to run (e.g., "python3", a venv path, etc.).
+        """
+        self._default_timeout_s = float(default_timeout_s)
+        self._python = python_executable
+
+    # --- BaseEnv interface ---
+
+    def reset(self) -> CodeObservation:
+        # No state to clear in this POC; return an initial observation.
+        return CodeObservation(stdout="", stderr="", exit_code=0)
+
+    def step(self, action: CodeAction) -> StepResult[CodeObservation]:
+        if not isinstance(action, CodeAction):
+            raise TypeError(f"Expected CodeAction, got {type(action)!r}")
+
+        # TODO: replace dummy response with the call to the code executor inside the container
+        obs, timed_out = CodeObservation(stderr="", stdout="", exit_code=0), False
+
+        # Simple reward heuristic: success and no stderr -> 1.0 else 0.0
+        reward: Optional[float] = (
+            1.0 if (obs.exit_code == 0 and not obs.stderr) else 0.0
+        )
+
+        info = {
+            "timed_out": timed_out,
+            "interpreter": self._python,
+        }
+
+        return StepResult(
+            observation=obs,
+            reward=reward,
+            done=False,  # Coding env is not episodic by default
+        )
diff --git a/src/envs/coding_env/models.py b/src/envs/coding_env/models.py
new file mode 100644
index 00000000..3721eec4
--- /dev/null
+++ b/src/envs/coding_env/models.py
@@ -0,0 +1,31 @@
+"""
+envs/coding_env/models.py
+--------------------------------
+Action/Observation types for the Coding environment.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any, Optional
+
+
+@dataclass
+class CodeAction:
+    """
+    Represents a single code execution request.
+    """
+
+    code: str
+    # Optional: future fields like 'lint': bool, 'timeout_s': float, etc.
+
+
+@dataclass
+class CodeObservation:
+    """
+    Result of executing code in the environment.
+    """
+
+    stdout: str = ""
+    stderr: str = ""
+    exit_code: int = 0