diff --git a/environments/math_python/math_python.py b/environments/math_python/math_python.py
index 87cc69335..4f9a9d106 100644
--- a/environments/math_python/math_python.py
+++ b/environments/math_python/math_python.py
@@ -31,7 +31,7 @@ def load_environment(
 
     parser = vf.Parser(extract_fn=extract_boxed_answer)
     math_rubric = vf.MathRubric(parser=parser)
-    vf_env = vf.PythonEnv(
+    return vf.PythonEnv(
         dataset=dataset,
         system_prompt=system_prompt,
         parser=parser,
@@ -50,7 +50,3 @@ def load_environment(
         sandbox_client_max_workers=sandbox_client_max_workers,
         **kwargs,
     )
-    assert vf_env.tools is not None
-    tool_rubric = vf.ToolRubric(tools=vf_env.tools)
-    vf_env.rubric = vf.RubricGroup(rubrics=[tool_rubric, vf_env.rubric])
-    return vf_env
diff --git a/tests/test_env_group.py b/tests/test_env_group.py
index 72289fcee..0d834bac7 100644
--- a/tests/test_env_group.py
+++ b/tests/test_env_group.py
@@ -47,7 +47,7 @@ def func3(completion, **kwargs):
 
         assert rubric.env_map == env_map
         # Should have all unique reward function names
-        assert set(rubric.all_reward_names) == {"func1", "func2", "func3"}
+        assert set(rubric.all_reward_names) == {"num_turns", "func1", "func2", "func3"}
 
     @pytest.mark.asyncio
     async def test_env_group_rubric_score_rollout(self, mock_openai_client):
diff --git a/verifiers/__init__.py b/verifiers/__init__.py
index f148395b2..528c94fe4 100644
--- a/verifiers/__init__.py
+++ b/verifiers/__init__.py
@@ -29,7 +29,6 @@
 from .parsers.xml_parser import XMLParser
 from .rubrics.judge_rubric import JudgeRubric
 from .rubrics.rubric_group import RubricGroup
-from .rubrics.tool_rubric import ToolRubric
 from .utils.data_utils import (
     extract_boxed_answer,
     extract_hash_answer,
@@ -84,7 +83,6 @@ def setup_logging(
     "Rubric",
     "JudgeRubric",
     "RubricGroup",
-    "ToolRubric",
     "MathRubric",
     "TextArenaEnv",
     "ReasoningGymEnv",
diff --git a/verifiers/envs/environment.py b/verifiers/envs/environment.py
index 662fa155a..2eb176caa 100644
--- a/verifiers/envs/environment.py
+++ b/verifiers/envs/environment.py
@@ -1058,6 +1058,14 @@ def set_kwargs(self, **kwargs) -> None:
             else:
                 setattr(self, key, value)
 
+    def add_rubric(self, rubric: Rubric) -> None:
+        if self.rubric is None:
+            self.rubric = rubric
+        elif isinstance(self.rubric, vf.RubricGroup):
+            self.rubric.rubrics.append(rubric)
+        else:
+            self.rubric = vf.RubricGroup(rubrics=[self.rubric, rubric])
+
     def set_max_seq_len(self, max_seq_len: int | None) -> None:
         """Set the maximum sequence length for this environment."""
         self.max_seq_len = max_seq_len
diff --git a/verifiers/envs/multiturn_env.py b/verifiers/envs/multiturn_env.py
index 1aec4dd7a..9841cf6d8 100644
--- a/verifiers/envs/multiturn_env.py
+++ b/verifiers/envs/multiturn_env.py
@@ -23,11 +23,22 @@
 logger = logging.getLogger(__name__)
 
 
+class MultiTurnMonitorRubric(vf.Rubric):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.add_metric(self.num_turns)
+
+    async def num_turns(self, state: State) -> int:
+        return len(state["trajectory"])
+
+
 class MultiTurnEnv(vf.Environment):
     def __init__(self, max_turns: int = -1, **kwargs):
         super().__init__(**kwargs)
         self.max_turns = max_turns
 
+        self.add_rubric(MultiTurnMonitorRubric())
+
     @abstractmethod
     async def env_response(
         self, messages: Messages, state: State, **kwargs
diff --git a/verifiers/envs/python_env.py b/verifiers/envs/python_env.py
index 8c695e1b2..b5651ec82 100644
--- a/verifiers/envs/python_env.py
+++ b/verifiers/envs/python_env.py
@@ -17,6 +17,7 @@
 class PythonWorkerState(TypedDict):
     ready: bool
     execution_count: int
+    ready_wait_time: float
 
 
 class PythonWorkerNotReadyError(vf.SandboxError): ...
@@ -28,6 +29,15 @@ class PythonWorkerRequestError(vf.SandboxError): ...
 class PythonWorkerDeadError(vf.SandboxError): ...
 
 
+class PythonMonitorRubric(vf.Rubric):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.add_metric(self.python_ready_wait_time)
+
+    async def python_ready_wait_time(self, state: vf.State) -> float:
+        return state["python_state"]["ready_wait_time"]
+
+
 class PythonEnv(SandboxEnv):
     """Sandbox-backed environment exposing a persistent Python REPL."""
 
@@ -189,6 +199,7 @@ def __init__(
             start_command=start_command,
             **kwargs,
         )
+        self.add_rubric(PythonMonitorRubric())
         self.add_tool(
             self.python, args_to_skip=["sandbox_id", "sandbox_state", "python_state"]
         )
@@ -199,6 +210,7 @@ async def setup_state(self, state: vf.State, **kwargs: Any) -> vf.State:
         state["python_state"] = {
             "ready": False,
             "execution_count": 0,
+            "ready_wait_time": -1.0,
         }
         return state
 
@@ -229,7 +241,7 @@ async def python(
     ) -> str:
         """Execute `code` inside persistent Python REPL."""
         if not python_state["ready"]:
-            await self._wait_for_worker_ready(sandbox_state, sandbox_id)
+            await self._wait_for_worker_ready(sandbox_id, sandbox_state, python_state)
             python_state["ready"] = True
         self.logger.debug(f"Executing code\n{code}")
         sandbox_response = await self._send_worker_request(
@@ -242,7 +254,10 @@ async def cleanup_python_state(self, state: vf.State):
         state.pop("python_state", None)
 
     async def _wait_for_worker_ready(
-        self, sandbox_state: SandboxState, sandbox_id: str
+        self,
+        sandbox_id: str,
+        sandbox_state: SandboxState,
+        python_state: PythonWorkerState,
     ) -> None:
         s = time.time()
         try:
@@ -260,11 +275,13 @@ async def _wait_for_worker_ready(
             )
             if result.exit_code != 0:
                 raise RuntimeError(result.stderr)
-            self.logger.debug(
-                f"Waited {time.time() - s:.1f}s for Python worker to be ready"
-            )
         except Exception as e:
             raise PythonWorkerNotReadyError from e
+        ready_wait_time = time.time() - s
+        python_state["ready_wait_time"] = ready_wait_time
+        self.logger.debug(
+            f"Waited {ready_wait_time:.1f}s for Python worker to be ready"
+        )
 
     async def _send_worker_request(
         self,
diff --git a/verifiers/envs/sandbox_env.py b/verifiers/envs/sandbox_env.py
index ff7fc52b8..794b88c16 100644
--- a/verifiers/envs/sandbox_env.py
+++ b/verifiers/envs/sandbox_env.py
@@ -89,6 +89,8 @@ def teardown(self, wait: bool = True) -> None:
 
 class SandboxState(TypedDict):
     ready: bool
+    ready_wait_time: float
+    command_execution_times: list[float]
 
 
 class SandboxCreationError(vf.SandboxError): ...
@@ -97,6 +99,24 @@ class SandboxCreationError(vf.SandboxError): ...
 class SandboxNotReadyError(vf.SandboxError): ...
 
 
+class SandboxMonitorRubric(vf.Rubric):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.add_metric(self.sandbox_ready_wait_time)
+        self.add_metric(self.sandbox_command_execution_time)
+
+    async def sandbox_ready_wait_time(self, state: vf.State) -> float:
+        return state["sandbox_state"]["ready_wait_time"]
+
+    async def sandbox_command_execution_time(self, state: vf.State) -> float:
+        command_execution_times = state["sandbox_state"]["command_execution_times"]
+        return (
+            sum(command_execution_times) / len(command_execution_times)
+            if len(command_execution_times) > 0
+            else 0.0
+        )
+
+
 class SandboxEnv(vf.StatefulToolEnv):
     def __init__(
         self,
@@ -127,6 +147,7 @@ def __init__(
             stop_errors=stop_errors if stop_errors is not None else [vf.SandboxError],
             **kwargs,
         )
+        self.add_rubric(SandboxMonitorRubric())
         self.timeout_per_command_seconds = timeout_per_command_seconds
         self.sandbox_client = ThreadedAsyncSandboxClient(
             max_workers=sandbox_client_max_workers,
@@ -173,7 +194,9 @@ async def _wait_for_sandbox_ready(
             sandbox_state["ready"] = True
         except Exception as e:
             raise SandboxNotReadyError(e)
-        self.logger.debug(f"Waited {time.time() - s:.1f}s for sandbox to be ready")
+        ready_wait_time = time.time() - s
+        sandbox_state["ready_wait_time"] = ready_wait_time
+        self.logger.debug(f"Waited {ready_wait_time:.1f}s for sandbox to be ready")
 
     async def bash(
         self,
@@ -197,13 +220,16 @@ async def bash(
                 timeout=self.timeout_per_command_seconds,
             )
         except CommandTimeoutError:
-            e = time.time()
             timeout_msg = f"Command timed out after {self.timeout_per_command_seconds}s"
             self.logger.warning(f"{timeout_msg} in sandbox {sandbox_id}")
+            sandbox_state["command_execution_times"].append(
+                self.timeout_per_command_seconds
+            )
             return f"Error: {timeout_msg}"
         except Exception as e:
             raise vf.SandboxError from e
-        e = time.time()
+        command_execution_time = time.time() - s
+        sandbox_state["command_execution_times"].append(command_execution_time)
         stdout = results.stdout.strip()
         stderr = (results.stderr or "").strip()
         combined = stdout
@@ -213,7 +239,9 @@ async def bash(
             else:
                 combined = f"stderr:\n{stderr}"
         output = combined or "(no output)"
-        self.logger.debug(f"Executed command in {e - s:.1f}s. Got output: {output}")
+        self.logger.debug(
+            f"Executed command in {command_execution_time:.1f}s. Got output: {output}"
+        )
         return output
 
     async def post_rollout(self, state: vf.State):
@@ -252,7 +280,11 @@ async def setup_state(self, state: vf.State, **kwargs) -> vf.State:
         self.active_sandboxes.add(sandbox.id)
         self.logger.debug(f"Created sandbox {sandbox.id}")
         state["sandbox_id"] = sandbox.id
-        state["sandbox_state"] = {"ready": False}
+        state["sandbox_state"] = {
+            "ready": False,
+            "ready_wait_time": -1.0,
+            "command_execution_times": [],
+        }
         return await super().setup_state(state, **kwargs)
 
     def update_tool_args(
diff --git a/verifiers/envs/tool_env.py b/verifiers/envs/tool_env.py
index 6acd4cca6..fa622c5a7 100644
--- a/verifiers/envs/tool_env.py
+++ b/verifiers/envs/tool_env.py
@@ -4,10 +4,57 @@
 from openai.types.chat import ChatCompletionAssistantMessageParam
 
 import verifiers as vf
+from verifiers.types import Messages
 from verifiers.utils.async_utils import maybe_await
 from verifiers.utils.tool_utils import convert_func_to_oai_tool
 
 
+class ToolMonitorRubric(vf.Rubric):
+    def __init__(self, tools: list[Callable] | None = None, **kwargs):
+        super().__init__(**kwargs)
+
+        self.tools = tools or []
+        self.tool_names = [tool.__name__ for tool in self.tools]  # type: ignore[union-attr]
+
+        # add tool metrics
+        self.add_metric(self.total_tool_calls)
+        for tool_name in self.tool_names:
+            self.add_metric(self.get_tool_call_count_func(tool_name))
+
+    async def total_tool_calls(self, completion: Messages) -> float:
+        """Count the total number of tool calls."""
+        total = 0
+        assert isinstance(completion, list)
+        for msg in completion:
+            if msg["role"] == "assistant" and "tool_calls" in msg:
+                assistant_msg = cast(ChatCompletionAssistantMessageParam, msg)  # type: ignore[redundant-cast]
+                tool_calls = assistant_msg.get("tool_calls", [])
+                if isinstance(tool_calls, list):
+                    total += len(tool_calls)
+        return float(total)
+
+    def get_tool_call_count_func(self, tool_name: str) -> Callable:
+        """Create a metric that counts calls to a specific tool."""
+
+        async def tool_call_count_func(completion: Messages) -> int:
+            """Count calls to {tool_name} tool."""
+            count = 0
+            # Find tool calls in assistant messages
+            assert isinstance(completion, list)
+            for msg in completion:
+                if msg["role"] == "assistant" and "tool_calls" in msg:
+                    assistant_msg = cast(ChatCompletionAssistantMessageParam, msg)  # type: ignore[redundant-cast]
+                    tool_calls = assistant_msg.get("tool_calls", [])
+                    for tool_call in tool_calls:
+                        if tool_call.get("function", {}).get("name") == tool_name:
+                            count += 1
+
+            return count
+
+        tool_call_count_func.__name__ = f"{tool_name}_calls"
+        return tool_call_count_func
+
+
 class ToolEnv(vf.MultiTurnEnv):
     def __init__(
         self,
@@ -28,6 +75,8 @@ def __init__(
         }
         super().__init__(oai_tools=self.oai_tools, max_turns=max_turns, **kwargs)
 
+        self.add_rubric(ToolMonitorRubric(tools=self.tools))
+
     def _should_stop_for_error(self, err: Exception) -> bool:
         """Check if error is in stop_errors."""
         return any(isinstance(err, err_type) for err_type in self.stop_errors)
diff --git a/verifiers/rubrics/tool_rubric.py b/verifiers/rubrics/tool_rubric.py
deleted file mode 100644
index 210020926..000000000
--- a/verifiers/rubrics/tool_rubric.py
+++ /dev/null
@@ -1,61 +0,0 @@
-from typing import Callable, cast
-
-from openai.types.chat import ChatCompletionAssistantMessageParam
-
-from verifiers.rubrics.rubric import Rubric
-from verifiers.types import Messages
-from verifiers.utils.tool_utils import convert_func_to_oai_tool
-
-
-class ToolRubric(Rubric):
-    """Simple rubric that counts tool calls in completion messages."""
-
-    def __init__(self, tools: list[Callable] | None = None):
-        self.tools = tools or []
-        self.oai_tools = [convert_func_to_oai_tool(tool) for tool in self.tools]
-        self.tool_names = [tool.__name__ for tool in self.tools]  # type: ignore[union-attr]
-
-        # Build initial reward functions and weights
-        reward_funcs = []
-        reward_funcs.append(self.total_tool_calls)
-        reward_weights = [0.0]
-
-        for tool_name in self.tool_names:
-            reward_funcs.append(self.get_tool_call_count_func(tool_name))
-            reward_weights.append(0.0)
-
-        # Pass them to parent class
-        super().__init__(funcs=reward_funcs, weights=reward_weights)
-
-    async def total_tool_calls(self, completion: Messages) -> float:
-        """Count the total number of tool calls across all assistant messages."""
-        total = 0
-        assert isinstance(completion, list)
-        for msg in completion:
-            if msg["role"] == "assistant" and "tool_calls" in msg:
-                assistant_msg = cast(ChatCompletionAssistantMessageParam, msg)  # type: ignore[redundant-cast]
-                tool_calls = assistant_msg.get("tool_calls", [])
-                if isinstance(tool_calls, list):
-                    total += len(tool_calls)
-        return float(total)
-
-    def get_tool_call_count_func(self, tool_name: str) -> Callable:
-        """Create a reward function that counts calls to a specific tool."""
-
-        async def tool_call_count_func(completion: Messages) -> float:
-            """Count calls to {tool_name} tool."""
-            count = 0
-            # Find tool calls in assistant messages
-            assert isinstance(completion, list)
-            for msg in completion:
-                if msg["role"] == "assistant" and "tool_calls" in msg:
-                    assistant_msg = cast(ChatCompletionAssistantMessageParam, msg)  # type: ignore[redundant-cast]
-                    tool_calls = assistant_msg.get("tool_calls", [])
-                    for tool_call in tool_calls:
-                        if tool_call.get("function", {}).get("name") == tool_name:
-                            count += 1
-
-            return float(count)
-
-        tool_call_count_func.__name__ = f"{tool_name}_calls"
-        return tool_call_count_func