diff --git a/CLAUDE.md b/CLAUDE.md
index 678d5c2..a4b1b37 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -472,22 +472,27 @@ Check EXTEND.md existence (priority order):
 \`\`\`bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/<skill-name>/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/<skill-name>/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/<skill-name>/EXTEND.md" && echo "user"
 \`\`\`
 
 \`\`\`powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/<skill-name>/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/<skill-name>/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/<skill-name>/EXTEND.md") { "user" }
 \`\`\`
 
-┌────────────────────────────────────────────┬───────────────────┐
-│                    Path                    │     Location      │
-├────────────────────────────────────────────┼───────────────────┤
-│ .baoyu-skills/<skill-name>/EXTEND.md       │ Project directory │
-├────────────────────────────────────────────┼───────────────────┤
-│ $HOME/.baoyu-skills/<skill-name>/EXTEND.md │ User home         │
-└────────────────────────────────────────────┴───────────────────┘
+┌────────────────────────────────────────────────────────┬──────────────────────────┐
+│                          Path                          │         Location         │
+├────────────────────────────────────────────────────────┼──────────────────────────┤
+│ .baoyu-skills/<skill-name>/EXTEND.md                   │ Project directory        │
+├────────────────────────────────────────────────────────┼──────────────────────────┤
+│ $XDG_CONFIG_HOME/baoyu-skills/<skill-name>/EXTEND.md   │ XDG config (~/.config)   │
+├────────────────────────────────────────────────────────┼──────────────────────────┤
+│ $HOME/.baoyu-skills/<skill-name>/EXTEND.md             │ User home (legacy)       │
+└────────────────────────────────────────────────────────┴──────────────────────────┘
 
 ┌───────────┬───────────────────────────────────────────────────────────────────────────┐
 │  Result   │                                  Action                                   │
@@ -523,5 +528,6 @@ Custom configurations via EXTEND.md. See **Preferences** section for paths and s
 **Notes**:
 - Replace `<skill-name>` with actual skill name (e.g., `baoyu-cover-image`)
 - Use `$HOME` instead of `~` for cross-platform compatibility (macOS/Linux/WSL/PowerShell)
+- `$XDG_CONFIG_HOME` defaults to `~/.config` when unset
 - Use `test -f` (Bash) or `Test-Path` (PowerShell) for explicit file existence check
 - ASCII tables for clear visual formatting
diff --git a/skills/baoyu-article-illustrator/SKILL.md b/skills/baoyu-article-illustrator/SKILL.md
index cd34254..1c7457e 100644
--- a/skills/baoyu-article-illustrator/SKILL.md
+++ b/skills/baoyu-article-illustrator/SKILL.md
@@ -55,12 +55,15 @@ See [references/styles.md](references/styles.md) for Core Styles, full gallery,
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-article-illustrator/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-article-illustrator/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-article-illustrator/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-article-illustrator/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-article-illustrator/references/workflow.md b/skills/baoyu-article-illustrator/references/workflow.md
index 4b9723d..53efc27 100644
--- a/skills/baoyu-article-illustrator/references/workflow.md
+++ b/skills/baoyu-article-illustrator/references/workflow.md
@@ -88,12 +88,15 @@ Check preferences and existing state, then ask ALL needed questions in ONE AskUs
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-article-illustrator/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-article-illustrator/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-article-illustrator/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-article-illustrator/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-comic/references/workflow.md b/skills/baoyu-comic/references/workflow.md
index 24cc71d..700a948 100644
--- a/skills/baoyu-comic/references/workflow.md
+++ b/skills/baoyu-comic/references/workflow.md
@@ -39,12 +39,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-comic/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-comic/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-comic/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-comic/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-comic/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-comic/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-compress-image/SKILL.md b/skills/baoyu-compress-image/SKILL.md
index e5bd91c..b925e7c 100644
--- a/skills/baoyu-compress-image/SKILL.md
+++ b/skills/baoyu-compress-image/SKILL.md
@@ -30,12 +30,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-compress-image/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-compress-image/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-compress-image/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-compress-image/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-compress-image/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-compress-image/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-cover-image/SKILL.md b/skills/baoyu-cover-image/SKILL.md
index e0cbf01..4718c02 100644
--- a/skills/baoyu-cover-image/SKILL.md
+++ b/skills/baoyu-cover-image/SKILL.md
@@ -134,12 +134,15 @@ Check EXTEND.md existence (priority: project → user):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-cover-image/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-cover-image/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-cover-image/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-cover-image/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-cover-image/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-cover-image/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-danger-gemini-web/SKILL.md b/skills/baoyu-danger-gemini-web/SKILL.md
index 5ef48f1..9552610 100644
--- a/skills/baoyu-danger-gemini-web/SKILL.md
+++ b/skills/baoyu-danger-gemini-web/SKILL.md
@@ -57,12 +57,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-danger-gemini-web/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-danger-gemini-web/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-danger-gemini-web/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-danger-gemini-web/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-danger-gemini-web/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-danger-gemini-web/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-danger-x-to-markdown/SKILL.md b/skills/baoyu-danger-x-to-markdown/SKILL.md
index 8feace3..5b5f827 100644
--- a/skills/baoyu-danger-x-to-markdown/SKILL.md
+++ b/skills/baoyu-danger-x-to-markdown/SKILL.md
@@ -83,12 +83,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-format-markdown/SKILL.md b/skills/baoyu-format-markdown/SKILL.md
index 09873ec..d034b06 100644
--- a/skills/baoyu-format-markdown/SKILL.md
+++ b/skills/baoyu-format-markdown/SKILL.md
@@ -34,12 +34,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-format-markdown/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-format-markdown/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-format-markdown/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-format-markdown/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-format-markdown/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-format-markdown/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-image-gen/SKILL.md b/skills/baoyu-image-gen/SKILL.md
index 1400692..5086217 100644
--- a/skills/baoyu-image-gen/SKILL.md
+++ b/skills/baoyu-image-gen/SKILL.md
@@ -31,12 +31,15 @@ Check EXTEND.md existence (priority: project → user):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-image-gen/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-image-gen/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-image-gen/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-image-gen/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-image-gen/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-image-gen/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-infographic/SKILL.md b/skills/baoyu-infographic/SKILL.md
index 4b6a44d..7024534 100644
--- a/skills/baoyu-infographic/SKILL.md
+++ b/skills/baoyu-infographic/SKILL.md
@@ -147,12 +147,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-infographic/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-infographic/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-infographic/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-infographic/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-infographic/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-infographic/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-markdown-to-html/SKILL.md b/skills/baoyu-markdown-to-html/SKILL.md
index 22e5f50..d3e60e8 100644
--- a/skills/baoyu-markdown-to-html/SKILL.md
+++ b/skills/baoyu-markdown-to-html/SKILL.md
@@ -30,12 +30,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-markdown-to-html/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-markdown-to-html/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-markdown-to-html/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-markdown-to-html/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-markdown-to-html/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-markdown-to-html/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-markdown-to-html/scripts/md/extend-config.ts b/skills/baoyu-markdown-to-html/scripts/md/extend-config.ts
index e377233..b4a0018 100644
--- a/skills/baoyu-markdown-to-html/scripts/md/extend-config.ts
+++ b/skills/baoyu-markdown-to-html/scripts/md/extend-config.ts
@@ -37,6 +37,10 @@ function parseExtendYaml(yaml: string): Partial<ExtendConfig> {
 export function loadExtendConfig(): Partial<ExtendConfig> {
   const paths = [
     path.join(process.cwd(), ".baoyu-skills", "baoyu-markdown-to-html", "EXTEND.md"),
+    path.join(
+      process.env.XDG_CONFIG_HOME || path.join(homedir(), ".config"),
+      "baoyu-skills", "baoyu-markdown-to-html", "EXTEND.md"
+    ),
     path.join(homedir(), ".baoyu-skills", "baoyu-markdown-to-html", "EXTEND.md"),
   ];
   for (const p of paths) {
diff --git a/skills/baoyu-post-to-wechat/SKILL.md b/skills/baoyu-post-to-wechat/SKILL.md
index 44cb7c1..8d3aea1 100644
--- a/skills/baoyu-post-to-wechat/SKILL.md
+++ b/skills/baoyu-post-to-wechat/SKILL.md
@@ -36,12 +36,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-post-to-wechat/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-post-to-wechat/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-post-to-wechat/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-post-to-wechat/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-post-to-wechat/scripts/md/extend-config.ts b/skills/baoyu-post-to-wechat/scripts/md/extend-config.ts
index e377233..b4a0018 100644
--- a/skills/baoyu-post-to-wechat/scripts/md/extend-config.ts
+++ b/skills/baoyu-post-to-wechat/scripts/md/extend-config.ts
@@ -37,6 +37,10 @@ function parseExtendYaml(yaml: string): Partial<ExtendConfig> {
 export function loadExtendConfig(): Partial<ExtendConfig> {
   const paths = [
     path.join(process.cwd(), ".baoyu-skills", "baoyu-markdown-to-html", "EXTEND.md"),
+    path.join(
+      process.env.XDG_CONFIG_HOME || path.join(homedir(), ".config"),
+      "baoyu-skills", "baoyu-markdown-to-html", "EXTEND.md"
+    ),
     path.join(homedir(), ".baoyu-skills", "baoyu-markdown-to-html", "EXTEND.md"),
   ];
   for (const p of paths) {
diff --git a/skills/baoyu-post-to-weibo/SKILL.md b/skills/baoyu-post-to-weibo/SKILL.md
index 772e846..556906a 100644
--- a/skills/baoyu-post-to-weibo/SKILL.md
+++ b/skills/baoyu-post-to-weibo/SKILL.md
@@ -40,12 +40,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-post-to-weibo/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-post-to-weibo/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-post-to-weibo/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-post-to-weibo/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-post-to-weibo/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-post-to-weibo/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-post-to-x/SKILL.md b/skills/baoyu-post-to-x/SKILL.md
index 19d54c5..dbac616 100644
--- a/skills/baoyu-post-to-x/SKILL.md
+++ b/skills/baoyu-post-to-x/SKILL.md
@@ -44,12 +44,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-post-to-x/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-post-to-x/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-post-to-x/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-post-to-x/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-post-to-x/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-post-to-x/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-slide-deck/SKILL.md b/skills/baoyu-slide-deck/SKILL.md
index 7bb8154..b9e4bb8 100644
--- a/skills/baoyu-slide-deck/SKILL.md
+++ b/skills/baoyu-slide-deck/SKILL.md
@@ -203,12 +203,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-slide-deck/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-slide-deck/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-slide-deck/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-slide-deck/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-slide-deck/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-slide-deck/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-translate/SKILL.md b/skills/baoyu-translate/SKILL.md
index 36825bf..2c18508 100644
--- a/skills/baoyu-translate/SKILL.md
+++ b/skills/baoyu-translate/SKILL.md
@@ -30,12 +30,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-translate/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-translate/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-translate/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-translate/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-translate/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-translate/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-url-to-markdown/SKILL.md b/skills/baoyu-url-to-markdown/SKILL.md
index abbca55..1f382c2 100644
--- a/skills/baoyu-url-to-markdown/SKILL.md
+++ b/skills/baoyu-url-to-markdown/SKILL.md
@@ -38,12 +38,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-url-to-markdown/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-url-to-markdown/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-url-to-markdown/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-url-to-markdown/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-url-to-markdown/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-url-to-markdown/EXTEND.md") { "user" }
 ```
 
diff --git a/skills/baoyu-xhs-images/SKILL.md b/skills/baoyu-xhs-images/SKILL.md
index 5e4e5b3..727440f 100644
--- a/skills/baoyu-xhs-images/SKILL.md
+++ b/skills/baoyu-xhs-images/SKILL.md
@@ -278,12 +278,15 @@ Check EXTEND.md existence (priority order):
 ```bash
 # macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-xhs-images/EXTEND.md && echo "project"
+test -f "${XDG_CONFIG_HOME:-$HOME/.config}/baoyu-skills/baoyu-xhs-images/EXTEND.md" && echo "xdg"
 test -f "$HOME/.baoyu-skills/baoyu-xhs-images/EXTEND.md" && echo "user"
 ```
 
 ```powershell
 # PowerShell (Windows)
 if (Test-Path .baoyu-skills/baoyu-xhs-images/EXTEND.md) { "project" }
+$xdg = if ($env:XDG_CONFIG_HOME) { $env:XDG_CONFIG_HOME } else { "$HOME/.config" }
+if (Test-Path "$xdg/baoyu-skills/baoyu-xhs-images/EXTEND.md") { "xdg" }
 if (Test-Path "$HOME/.baoyu-skills/baoyu-xhs-images/EXTEND.md") { "user" }
 ```