diff --git a/best-practice/claude-subagents.md b/best-practice/claude-subagents.md
index 95fe9ce..03b8375 100644
--- a/best-practice/claude-subagents.md
+++ b/best-practice/claude-subagents.md
@@ -1,6 +1,6 @@
# Sub-agents Best Practice
- 
+ 
[](../implementation/claude-subagents-implementation.md)
Claude Code subagents — frontmatter fields and official built-in agent types.
@@ -30,7 +30,7 @@ Claude Code subagents — frontmatter fields and official built-in agent types.
| `hooks` | object | No | Lifecycle hooks scoped to this subagent. All hook events are supported; `PreToolUse`, `PostToolUse`, and `Stop` are the most common |
| `memory` | string | No | Persistent memory scope: `user`, `project`, or `local` |
| `background` | boolean | No | Set to `true` to always run as a background task (default: `false`) |
-| `effort` | string | No | Effort level override when this subagent is active: `low`, `medium`, `high`, `max` (Opus 4.6 only). Default: inherits from session |
+| `effort` | string | No | Effort level override when this subagent is active: `low`, `medium`, `high`, `xhigh`, `max` (Opus 4.6 only). Default: inherits from session |
| `isolation` | string | No | Set to `"worktree"` to run in a temporary git worktree (auto-cleaned if no changes) |
| `initialPrompt` | string | No | Auto-submitted as the first user turn when this agent runs as the main session agent (via `--agent` or the `agent` setting). Commands and skills are processed. Prepended to any user-provided prompt |
| `color` | string | No | Display color for the subagent in the task list and transcript: `red`, `blue`, `green`, `yellow`, `purple`, `orange`, `pink`, or `cyan` |