diff --git a/best-practice/claude-skills.md b/best-practice/claude-skills.md
index bbfaed8..ba4b3a8 100644
--- a/best-practice/claude-skills.md
+++ b/best-practice/claude-skills.md
@@ -1,6 +1,6 @@
# Skills Best Practice
- 
+ 
[](../implementation/claude-skills-implementation.md)
Claude Code skills — frontmatter fields and official bundled skills.
@@ -26,7 +26,7 @@ Claude Code skills — frontmatter fields and official bundled skills.
| `user-invocable` | boolean | No | Set `false` to hide from the `/` menu — skill becomes background knowledge only, intended for agent preloading |
| `allowed-tools` | string | No | Tools allowed without permission prompts when this skill is active |
| `model` | string | No | Model to use when this skill runs (e.g., `haiku`, `sonnet`, `opus`) |
-| `effort` | string | No | Override the model effort level when invoked (`low`, `medium`, `high`, `max`) |
+| `effort` | string | No | Override the model effort level when invoked (`low`, `medium`, `high`, `xhigh`, `max`) |
| `context` | string | No | Set to `fork` to run the skill in an isolated subagent context |
| `agent` | string | No | Subagent type when `context: fork` is set (default: `general-purpose`) |
| `hooks` | object | No | Lifecycle hooks scoped to this skill |