diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 0d7924d679..29a3e301cb 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -58,6 +58,7 @@ Test fixtures for use by clients are available for each release on the [Github r
 
 - ✨ Fill test fixtures using EELS by default. EEST now uses the [`ethereum-specs-evm-resolver`](https://github.com/petertdavies/ethereum-spec-evm-resolver) with the EELS daemon ([#792](https://github.com/ethereum/execution-spec-tests/pull/792)).
 - 🔀 Move the `evm_transition_tool` package to `ethereum_clis` and derive the transition tool CL interfaces from a shared `EthereumCLI` class that can be reused for other sub-commands ([#894](https://github.com/ethereum/execution-spec-tests/pull/894)).
+- ✨ Pass `state_test` property to T8N tools that support it (Only EELS at the time of merge) ([#943](https://github.com/ethereum/execution-spec-tests/pull/943)).
 
 ### 📋 Misc
 
diff --git a/src/ethereum_clis/clis/besu.py b/src/ethereum_clis/clis/besu.py
index 708d5b949f..840c8f8082 100644
--- a/src/ethereum_clis/clis/besu.py
+++ b/src/ethereum_clis/clis/besu.py
@@ -108,6 +108,7 @@ def evaluate(
         reward: int = 0,
         eips: Optional[List[int]] = None,
         debug_output_path: str = "",
+        state_test: bool = False,
     ) -> TransitionToolOutput:
         """
         Executes `evm t8n` with the specified arguments.
diff --git a/src/ethereum_clis/clis/execution_specs.py b/src/ethereum_clis/clis/execution_specs.py
index 85ff426d64..335123bf53 100644
--- a/src/ethereum_clis/clis/execution_specs.py
+++ b/src/ethereum_clis/clis/execution_specs.py
@@ -9,7 +9,7 @@
 from pathlib import Path
 from re import compile
 from tempfile import TemporaryDirectory
-from typing import Optional
+from typing import Dict, List, Optional
 
 from ethereum_test_exceptions import (
     EOFException,
@@ -111,6 +111,16 @@ def is_fork_supported(self, fork: Fork) -> bool:
         """
         return (fork.transition_tool_name() + "\n") in self.help_string
 
+    def _generate_post_args(
+        self, t8n_data: TransitionTool.TransitionToolData
+    ) -> Dict[str, List[str] | str]:
+        """
+        Generate the arguments for the POST request to the t8n-server.
+
+        EELS T8N expects `--state-test` when running a state test.
+        """
+        return {"arg": "--state-test"} if t8n_data.state_test else {}
+
 
 class ExecutionSpecsExceptionMapper(ExceptionMapper):
     """
diff --git a/src/ethereum_clis/transition_tool.py b/src/ethereum_clis/transition_tool.py
index 47c53e6409..1306e3e93e 100644
--- a/src/ethereum_clis/transition_tool.py
+++ b/src/ethereum_clis/transition_tool.py
@@ -13,6 +13,7 @@
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Any, Dict, List, Mapping, Optional, Type
+from urllib.parse import urlencode
 
 from requests import Response
 from requests.exceptions import ConnectionError
@@ -147,6 +148,7 @@ class TransitionToolData:
         fork_name: str
         chain_id: int = field(default=1)
         reward: int = field(default=0)
+        state_test: bool = field(default=False)
 
         def to_input(self) -> TransitionToolInput:
             """
@@ -271,14 +273,23 @@ def _evaluate_filesystem(
 
         return output
 
-    def _server_post(self, data: Dict[str, Any], retries: int = 10) -> Response:
+    def _server_post(
+        self,
+        data: Dict[str, Any],
+        url_args: Dict[str, List[str] | str] = {},
+        retries: int = 5,
+    ) -> Response:
         """
         Send a POST request to the t8n-server and return the response.
         """
         post_delay = 0.1
         while True:
             try:
-                response = Session().post(self.server_url, json=data, timeout=20)
+                response = Session().post(
+                    f"{self.server_url}?{urlencode(url_args, doseq=True)}",
+                    json=data,
+                    timeout=20,
+                )
                 break
             except ConnectionError as e:
                 retries -= 1
@@ -294,6 +305,12 @@ def _server_post(self, data: Dict[str, Any], retries: int = 10) -> Response:
             )
         return response
 
+    def _generate_post_args(self, t8n_data: TransitionToolData) -> Dict[str, List[str] | str]:
+        """
+        Generate the arguments for the POST request to the t8n-server.
+        """
+        return {}
+
     def _evaluate_server(
         self,
         *,
@@ -332,7 +349,7 @@ def _evaluate_server(
                 },
             )
 
-        response = self._server_post(post_data)
+        response = self._server_post(data=post_data, url_args=self._generate_post_args(t8n_data))
         output: TransitionToolOutput = TransitionToolOutput.model_validate(response.json())
 
         if debug_output_path:
@@ -478,6 +495,7 @@ def evaluate(
         reward: int = 0,
         eips: Optional[List[int]] = None,
         debug_output_path: str = "",
+        state_test: bool = False,
     ) -> TransitionToolOutput:
         """
         Executes the relevant evaluate method as required by the `t8n` tool.
@@ -500,6 +518,7 @@ def evaluate(
             fork_name=fork_name,
             chain_id=chain_id,
             reward=reward,
+            state_test=state_test,
         )
 
         if self.t8n_use_server:
diff --git a/src/ethereum_test_specs/state.py b/src/ethereum_test_specs/state.py
index a39add940e..4595d2f6bb 100644
--- a/src/ethereum_test_specs/state.py
+++ b/src/ethereum_test_specs/state.py
@@ -6,6 +6,7 @@
 from typing import Any, Callable, ClassVar, Dict, Generator, List, Optional, Type
 
 import pytest
+from pydantic import Field
 
 from ethereum_clis import TransitionTool
 from ethereum_test_exceptions import EngineAPIError
@@ -39,7 +40,7 @@ class StateTest(BaseTest):
     Filler type that tests transactions over the period of a single block.
     """
 
-    env: Environment
+    env: Environment = Field(default_factory=Environment)
     pre: Alloc
     post: Alloc
     tx: Transaction
@@ -149,6 +150,7 @@ def make_state_test_fixture(
             reward=0,  # Reward on state tests is always zero
             eips=eips,
             debug_output_path=self.get_next_transition_tool_output_path(),
+            state_test=True,
         )
 
         try:
diff --git a/whitelist.txt b/whitelist.txt
index 4d1ac828e9..1344a15896 100644
--- a/whitelist.txt
+++ b/whitelist.txt
@@ -113,6 +113,7 @@ discordapp
 dockerdocs
 docstring
 docstrings
+doseq
 dunder
 dup
 EEST