diff --git a/letta/otel/tracing.py b/letta/otel/tracing.py
index a646acd6..cae7850d 100644
--- a/letta/otel/tracing.py
+++ b/letta/otel/tracing.py
@@ -250,22 +250,25 @@ def trace_method(func):
                 "chunks",  # Large chunk arrays
             }
 
-            # Max size for parameter value strings (1KB)
-            MAX_PARAM_SIZE = 1024
-            # Max total size for all parameters (100KB)
-            MAX_TOTAL_SIZE = 1024 * 100
+            # Priority parameters that should ALWAYS be logged (exempt from opt-out)
+            NEVER_SKIP_PARAMS = {"request_data"}
+
+            # Max size for parameter value strings
+            MAX_PARAM_SIZE = 1024 * 1024 * 2  # 2MB (supports ~500k tokens)
+            # Max total size for all parameters
+            MAX_TOTAL_SIZE = 1024 * 1024 * 4  # 4MB
             total_size = 0
 
             for name, value in param_items:
                 try:
-                    # Check if we've exceeded total size limit
-                    if total_size > MAX_TOTAL_SIZE:
+                    # Check if we've exceeded total size limit (except for priority params)
+                    if total_size > MAX_TOTAL_SIZE and name not in NEVER_SKIP_PARAMS:
                         span.set_attribute("parameters.truncated", True)
                         span.set_attribute("parameters.truncated_reason", f"Total size exceeded {MAX_TOTAL_SIZE} bytes")
                         break
 
-                    # Skip parameters known to be large
-                    if name in SKIP_PARAMS:
+                    # Skip parameters known to be large (opt-out list, but respect ALWAYS_LOG)
+                    if name in SKIP_PARAMS and name not in NEVER_SKIP_PARAMS:
                         # Try to extract ID for observability
                         type_name = type(value).__name__
                         id_info = ""