diff --git a/atroposlib/envs/server_handling/managed_server.py b/atroposlib/envs/server_handling/managed_server.py
index 0918c325..cb14d210 100644
--- a/atroposlib/envs/server_handling/managed_server.py
+++ b/atroposlib/envs/server_handling/managed_server.py
@@ -7,6 +7,7 @@ This wrapper maintains a tree structure of sequences, where:
 - Branching occurs organically from different contexts and n > 1 completions
 """
 
+import os
 import time
 import uuid
 import warnings
@@ -131,6 +132,10 @@ class ManagedServer:
             # Fallback for tokenizers without chat template
             return "\n".join([f"{m['role']}: {m['content']}" for m in messages])
 
+    def _debug_requests_enabled(self) -> bool:
+        """Enable verbose request construction logs with ATROPOS_DEBUG_REQUESTS=1."""
+        return os.getenv("ATROPOS_DEBUG_REQUESTS", "0") == "1"
+
     def _find_extending_node(self, input_text: str) -> Optional[SequenceNode]:
         """
         Find a node that this input extends (default mode).
@@ -284,6 +289,19 @@ class ManagedServer:
         completion_kwargs = kwargs.copy()
         completion_kwargs["prompt"] = prompt
         completion_kwargs.pop("messages", None)
+        if self._debug_requests_enabled():
+            msg_count = len(messages)
+            prompt_preview = prompt.replace("\n", "\\n")[:600]
+            print(
+                f"[ATROPOS_REQ_DEBUG] chat_completion messages={msg_count} "
+                f"n={completion_kwargs.get('n')} max_tokens={completion_kwargs.get('max_tokens')} "
+                f"temperature={completion_kwargs.get('temperature')}",
+                flush=True,
+            )
+            print(
+                f"[ATROPOS_REQ_DEBUG] prompt_preview={prompt_preview!r}",
+                flush=True,
+            )
 
         # Set model name if not provided
         if "model" not in completion_kwargs:
diff --git a/atroposlib/envs/server_handling/vllm_server.py b/atroposlib/envs/server_handling/vllm_server.py
index 96242754..503d4419 100644
--- a/atroposlib/envs/server_handling/vllm_server.py
+++ b/atroposlib/envs/server_handling/vllm_server.py
@@ -2,6 +2,7 @@
 # see example_trainer/vllm_api_server.py for an example
 
 import asyncio
+import os
 import warnings
 
 import aiohttp
@@ -189,6 +190,39 @@ class VLLMServer(APIServer):
         # Prepare request for VLLM native API
         request_data = {"prompt": {"prompt_token_ids": prompt_tokens}, "logprobs": 0}
         request_data.update(kwargs)
+        debug_requests = os.getenv("ATROPOS_DEBUG_REQUESTS", "0") == "1"
+        if debug_requests:
+            base = self.config.base_url.replace("/v1", "")
+            prompt_preview = self.tokenizer.decode(prompt_tokens[:256]).replace("\n", "\\n")
+            print(
+                f"[ATROPOS_REQ_DEBUG] vllm_generate_url={base}/generate "
+                f"prompt_token_len={len(prompt_tokens)}",
+                flush=True,
+            )
+            print(
+                f"[ATROPOS_REQ_DEBUG] request_meta="
+                f"{{'n': {request_data.get('n')}, 'max_tokens': {request_data.get('max_tokens')}, "
+                f"'temperature': {request_data.get('temperature')}, 'top_p': {request_data.get('top_p')}}}",
+                flush=True,
+            )
+            print(
+                f"[ATROPOS_REQ_DEBUG] prompt_preview={prompt_preview!r}",
+                flush=True,
+            )
+            print(
+                "[ATROPOS_REQ_DEBUG] curl_template="
+                + (
+                    "curl -s -X POST "
+                    + f"{base}/generate "
+                    + "-H \"Content-Type: application/json\" "
+                    + "-d '{\"prompt\": \"<PROMPT_FROM_PREVIEW_OR_LOG>\", "
+                    + f"\"n\": {request_data.get('n', 1)}, "
+                    + f"\"max_tokens\": {request_data.get('max_tokens', 256)}, "
+                    + f"\"temperature\": {request_data.get('temperature', 1.0)}, "
+                    + f"\"top_p\": {request_data.get('top_p', 1.0)}}'"
+                ),
+                flush=True,
+            )
 
         # Make async request to VLLM /generate endpoint
         async with aiohttp.ClientSession() as session: