diff --git a/.github/skills/skill-installer/SKILL.md b/.github/skills/skill-installer/SKILL.md
index fc8b9b9..8990cd8 100644
--- a/.github/skills/skill-installer/SKILL.md
+++ b/.github/skills/skill-installer/SKILL.md
@@ -22,7 +22,7 @@ Use this skill to install another skill from a local path, a directory, or a Git
 
 - Local `SKILL.md` file
 - Local skill directory
-- GitHub blob URL to a `SKILL.md` file, including sibling supporting files
+- GitHub blob URL to a `SKILL.md` file
 
 ## Install script
 
@@ -50,7 +50,5 @@ The installer prompts for:
 1. Source path or URL
 2. Target scope: repo or global
 3. Skill name if it cannot be inferred
-4. Whether to copy supporting files for a local directory source
+4. Whether to copy supporting files
 5. Whether to overwrite an existing install
-
-For GitHub blob URLs, supporting files in the same skill directory are downloaded automatically.
diff --git a/.github/skills/skill-installer/scripts/install-skill.sh b/.github/skills/skill-installer/scripts/install-skill.sh
index ab3b8ee..089185c 100755
--- a/.github/skills/skill-installer/scripts/install-skill.sh
+++ b/.github/skills/skill-installer/scripts/install-skill.sh
@@ -35,16 +35,6 @@ rewrite_github_blob_url() {
   fi
 }
 
-parse_github_blob_url() {
-  local url="$1"
-  if [[ "$url" =~ ^https://github\.com/([^/]+)/([^/]+)/blob/([^/]+)/(.*)$ ]]; then
-    printf '%s\t%s\t%s\t%s\n' "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}" "${BASH_REMATCH[3]}" "${BASH_REMATCH[4]}"
-    return 0
-  fi
-
-  return 1
-}
-
 extract_skill_name() {
   local file="$1"
   sed -n 's/^name:[[:space:]]*//p' "$file" | head -n 1
@@ -56,45 +46,6 @@ download_source() {
   curl -fsSL "$url" -o "$out"
 }
 
-list_github_contents() {
-  local owner="$1"
-  local repo="$2"
-  local ref="$3"
-  local path="$4"
-
-  curl -fsSL -H 'Accept: application/vnd.github+json' \
-    "https://api.github.com/repos/${owner}/${repo}/contents/${path}?ref=${ref}" | \
-    python3 -c $'import json,sys\ndata = json.load(sys.stdin)\nitems = data if isinstance(data, list) else [data]\nfor item in items:\n    print("%s\\t%s\\t%s" % (item.get("type", ""), item.get("path", ""), item.get("download_url", "")))'
-}
-
-download_github_contents() {
-  local owner="$1"
-  local repo="$2"
-  local ref="$3"
-  local path="$4"
-  local target_root="$5"
-
-  while IFS=$'\t' read -r item_type item_path download_url; do
-    [[ -z "$item_type" ]] && continue
-
-    local relative_path="${item_path#${path}/}"
-    local destination_path="$target_root/$relative_path"
-
-    case "$item_type" in
-      dir)
-        download_github_contents "$owner" "$repo" "$ref" "$item_path" "$target_root"
-        ;;
-      file)
-        mkdir -p "$(dirname "$destination_path")"
-        download_source "$download_url" "$destination_path"
-        ;;
-      *)
-        printf 'Skipping unsupported GitHub content type: %s (%s)\n' "$item_type" "$item_path" >&2
-        ;;
-    esac
-  done < <(list_github_contents "$owner" "$repo" "$ref" "$path")
-}
-
 copy_skill_dir() {
   local source_dir="$1"
   local target_dir="$2"
@@ -131,16 +82,9 @@ source_kind=""
 source_path="$source_input"
 
 if [[ "$source_input" =~ ^https?:// ]]; then
-  if github_blob_parts="$(parse_github_blob_url "$source_input")"; then
-    source_kind="github-blob-url"
-    IFS=$'\t' read -r github_owner github_repo github_ref github_path <<<"$github_blob_parts"
-    github_skill_dir="$(dirname "$github_path")"
-    download_github_contents "$github_owner" "$github_repo" "$github_ref" "$github_skill_dir" "$staging_dir"
-  else
-    source_kind="url"
-    source_path="$(rewrite_github_blob_url "$source_input")"
-    download_source "$source_path" "$staging_dir/SKILL.md"
-  fi
+  source_kind="url"
+  source_path="$(rewrite_github_blob_url "$source_input")"
+  download_source "$source_path" "$staging_dir/SKILL.md"
 elif [[ -d "$source_input" ]]; then
   source_kind="directory"
   skill_file="$source_input/SKILL.md"
@@ -198,6 +142,4 @@ if [[ ! -f "$target_dir/SKILL.md" ]]; then
   exit 1
 fi
 
-echo "<$source_input>" >"$target_dir/source.md"
-
 printf 'Installed %s skill to %s\n' "$skill_name" "$target_dir"