diff --git a/tools/delegate_tool.py b/tools/delegate_tool.py
index f00701cd94a..73ba81272fc 100644
--- a/tools/delegate_tool.py
+++ b/tools/delegate_tool.py
@@ -25,6 +25,8 @@ import time
 from concurrent.futures import ThreadPoolExecutor, as_completed
 from typing import Any, Dict, List, Optional
 
+from toolsets import TOOLSETS
+
 
 # Tools that children must never have access to
 DELEGATE_BLOCKED_TOOLS = frozenset([
@@ -35,6 +37,18 @@ DELEGATE_BLOCKED_TOOLS = frozenset([
     "execute_code",    # children should reason step-by-step, not write scripts
 ])
 
+# Build a description fragment listing toolsets available for subagents.
+# Excludes toolsets where ALL tools are blocked, composite/platform toolsets
+# (hermes-* prefixed), and scenario toolsets.
+_EXCLUDED_TOOLSET_NAMES = frozenset({"debugging", "safe", "delegation", "moa", "rl"})
+_SUBAGENT_TOOLSETS = sorted(
+    name for name, defn in TOOLSETS.items()
+    if name not in _EXCLUDED_TOOLSET_NAMES
+    and not name.startswith("hermes-")
+    and not all(t in DELEGATE_BLOCKED_TOOLS for t in defn.get("tools", []))
+)
+_TOOLSET_LIST_STR = ", ".join(f"'{n}'" for n in _SUBAGENT_TOOLSETS)
+
 _DEFAULT_MAX_CONCURRENT_CHILDREN = 3
 MAX_DEPTH = 2  # parent (0) -> child (1) -> grandchild rejected (2)
 
@@ -999,9 +1013,10 @@ DELEGATE_TASK_SCHEMA = {
                 "description": (
                     "Toolsets to enable for this subagent. "
                     "Default: inherits your enabled toolsets. "
+                    f"Available toolsets: {_TOOLSET_LIST_STR}. "
                     "Common patterns: ['terminal', 'file'] for code work, "
-                    "['web'] for research, ['terminal', 'file', 'web'] for "
-                    "full-stack tasks."
+                    "['web'] for research, ['browser'] for web interaction, "
+                    "['terminal', 'file', 'web'] for full-stack tasks."
                 ),
             },
             "tasks": {
@@ -1014,7 +1029,7 @@ DELEGATE_TASK_SCHEMA = {
                         "toolsets": {
                             "type": "array",
                             "items": {"type": "string"},
-                            "description": "Toolsets for this specific task. Use 'web' for network access, 'terminal' for shell.",
+                            "description": f"Toolsets for this specific task. Available: {_TOOLSET_LIST_STR}. Use 'web' for network access, 'terminal' for shell, 'browser' for web interaction.",
                         },
                         "acp_command": {
                             "type": "string",