diff --git a/backend/app/services/export_service.py b/backend/app/services/export_service.py
index d680b277..41da72cb 100644
--- a/backend/app/services/export_service.py
+++ b/backend/app/services/export_service.py
@@ -90,6 +90,26 @@ def _get_command_output(decision: dict[str, Any]) -> str | None:
     return output if output else None
 
 
+def _truncate_command_output(output: str, max_lines: int = 5, fmt: str = "text") -> str:
+    """Truncate command output to max_lines for standard detail level.
+
+    Args:
+        fmt: One of "markdown", "text", "html", "psa" — controls suffix formatting.
+    """
+    lines = output.splitlines()
+    if len(lines) <= max_lines:
+        return output
+    truncated = "\n".join(lines[:max_lines])
+    count = len(lines)
+    if fmt == "markdown":
+        suffix = f"*(full output omitted — {count} lines)*"
+    elif fmt == "html":
+        suffix = f"<em>(full output omitted — {count} lines)</em>"
+    else:  # text, psa
+        suffix = f"(full output omitted — {count} lines)"
+    return f"{truncated}\n{suffix}"
+
+
 def _find_node_commands(tree_snapshot: dict[str, Any], node_id: str) -> list[str]:
     """Find the commands list for a node in the tree snapshot."""
     def _search(node: dict[str, Any]) -> list[str] | None:
@@ -170,6 +190,8 @@ def generate_markdown_export(session: Session, options: SessionExport) -> str:
         if notes:
             lines.append(f"**Notes:** {notes}")
         if command_output := _get_command_output(decision):
+            if options.detail_level == "standard":
+                command_output = _truncate_command_output(command_output, fmt="markdown")
             commands = _find_node_commands(session.tree_snapshot, decision.get("node_id", ""))
             if commands:
                 lines.append(f"**Commands Run:** {', '.join(f'`{c}`' for c in commands)}")
@@ -259,6 +281,8 @@ def generate_text_export(session: Session, options: SessionExport) -> str:
         if notes:
             lines.append(f"   Notes: {notes}")
         if command_output := _get_command_output(decision):
+            if options.detail_level == "standard":
+                command_output = _truncate_command_output(command_output, fmt="text")
             commands = _find_node_commands(session.tree_snapshot, decision.get("node_id", ""))
             if commands:
                 lines.append(f"   Commands Run: {', '.join(commands)}")
@@ -353,6 +377,8 @@ def generate_html_export(session: Session, options: SessionExport) -> str:
         if notes:
             html_parts.append(f'<p class="notes">Notes: {notes}</p>')
         if command_output := _get_command_output(decision):
+            if options.detail_level == "standard":
+                command_output = _truncate_command_output(command_output, fmt="html")
             commands = _find_node_commands(session.tree_snapshot, decision.get("node_id", ""))
             if commands:
                 cmd_html = ", ".join(f"<code>{html.escape(c)}</code>" for c in commands)
@@ -429,6 +455,8 @@ def generate_psa_export(session: Session, options: SessionExport) -> str:
             if notes:
                 lines.append(f"   Notes: {notes}")
             if command_output := _get_command_output(decision):
+                if options.detail_level == "standard":
+                    command_output = _truncate_command_output(command_output, fmt="psa")
                 commands = _find_node_commands(session.tree_snapshot, decision.get("node_id", ""))
                 if commands:
                     lines.append(f"   Commands: {', '.join(commands)}")