diff --git a/adapters/claude/rule-skills.tsv b/adapters/claude/rule-skills.tsv
index 8ba408e..f526e0f 100644
--- a/adapters/claude/rule-skills.tsv
+++ b/adapters/claude/rule-skills.tsv
@@ -1,5 +1,5 @@
 rule_file	skill_name	trigger
-angular.md	rules-angular	Angular component, template, or RxJS/signal work
+angular	rules-angular	Angular component, template, or RxJS/signal work
 csharp.md	rules-csharp	C# or .NET implementation, review, or refactoring work
 decision-rule.md	rules-decision-rule	evaluating requirements, ambiguous behavior, or technical choices that need a decision
 definition-of-done.md	rules-definition-of-done	validating that a task is complete or ready for review
@@ -16,5 +16,5 @@ security-network.md	rules-security-network	network, URL fetch, proxy, outbound r
 security-crypto.md	rules-security-crypto	cryptography, secrets, credentials, key, or token work
 security-supply-chain.md	rules-security-supply-chain	dependency, package, plugin, build, deployment, or CI supply-chain work
 typescript.md	rules-typescript	TypeScript or modern ECMAScript implementation work
-ui-ux.md	rules-ui-ux	UI or UX design and interaction decisions
-wpf.md	rules-wpf	WPF, XAML, or MVVM desktop UI work
+ui-ux	rules-ui-ux	UI or UX design and interaction decisions
+wpf	rules-wpf	WPF, XAML, or MVVM desktop UI work
diff --git a/scripts/build.ps1 b/scripts/build.ps1
index e1d2c9f..40793a6 100644
--- a/scripts/build.ps1
+++ b/scripts/build.ps1
@@ -109,11 +109,11 @@ Load rule files when their subject applies:
 - rules/security-network.md for network access, URLs, TLS, proxies, or SSRF.
 - rules/security-crypto.md for cryptography, secrets, credentials, keys, or tokens.
 - rules/security-supply-chain.md for dependencies, packages, plugins, builds, deployments, or CI.
-- rules/angular.md for Angular work.
+- rules/angular/index.md for Angular work.
 - rules/typescript.md for TypeScript work.
 - rules/csharp.md for C# or .NET work.
-- rules/wpf.md for WPF work.
-- rules/ui-ux.md for UI or UX decisions.
+- rules/wpf/index.md for WPF work.
+- rules/ui-ux/index.md for UI or UX decisions.
 - rules/microsoft.md for Microsoft 365, Azure DevOps, or Teams work.
 - rules/git.md for Git operations.
 - rules/refactoring.md for refactoring work.
@@ -140,11 +140,18 @@ foreach ($platform in @('windows','linux')) {
 
     $claudeRuleSkillLines = @()
     foreach ($entry in $ruleSkillEntries) {
+        $ruleSourcePath = Join-Path $shared "rules/$($entry.rule_file)"
+        $isDirectory = Test-Path -LiteralPath $ruleSourcePath -PathType Container
+        $ruleBodyPath = if ($isDirectory) { Join-Path $ruleSourcePath 'index.md' } else { $ruleSourcePath }
         $skillDir = Join-Path $output "claude-$platform/skills/rules/$($entry.skill_name)"
         New-Item $skillDir -ItemType Directory -Force | Out-Null
-        $ruleContent = Get-Content (Join-Path $shared "rules/$($entry.rule_file)") -Raw
+        $ruleContent = Get-Content $ruleBodyPath -Raw
         $skillBody = "---`r`nname: $($entry.skill_name)`r`ndescription: Use for $($entry.trigger).`r`n---`r`n`r`n$ruleContent"
         Set-Content (Join-Path $skillDir 'SKILL.md') $skillBody -Encoding UTF8
+        if ($isDirectory) {
+            $referencesSource = Join-Path $ruleSourcePath 'references'
+            if (Test-Path -LiteralPath $referencesSource) { Copy-Directory $referencesSource (Join-Path $skillDir 'references') }
+        }
         $claudeRuleSkillLines += "- $($entry.skill_name) for $($entry.trigger)."
     }
     $claudeRuleLoading = "Always apply ``rules/general.md`` before starting any task, embedded below.`r`n`r`nDetect the languages, frameworks, tools, and change areas from the repository and the requested work. Invoke every matching rule skill before editing. Invoke all matching rule skills when multiple technologies apply.`r`n`r`nInvoke rule skills when their subject applies:`r`n`r`n" + ($claudeRuleSkillLines -join "`r`n")
diff --git a/scripts/build.sh b/scripts/build.sh
index f0622ea..8b3c710 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -38,7 +38,7 @@ while IFS=$'\t' read -r rule_file skill_name trigger; do
   [ -n "$rule_file" ] || continue
   [ -n "$skill_name" ] || { printf 'Missing skill_name in rule-skill manifest row for %s.\n' "$rule_file" >&2; exit 1; }
   [ -n "$trigger" ] || { printf 'Missing trigger in rule-skill manifest row for %s.\n' "$rule_file" >&2; exit 1; }
-  [ -f "$shared/rules/$rule_file" ] || { printf 'Rule-skill manifest references a missing rule file: %s\n' "$rule_file" >&2; exit 1; }
+  [ -f "$shared/rules/$rule_file" ] || [ -d "$shared/rules/$rule_file" ] || { printf 'Rule-skill manifest references a missing rule file: %s\n' "$rule_file" >&2; exit 1; }
   [ -z "${rule_skill_seen[$skill_name]+x}" ] || { printf 'Duplicate rule-skill name in manifest: %s\n' "$skill_name" >&2; exit 1; }
   rule_skill_seen[$skill_name]=1
   rule_skill_files+=("$rule_file")
@@ -99,11 +99,11 @@ Load rule files when their subject applies:
 - rules/security-network.md for network access, URLs, TLS, proxies, or SSRF.
 - rules/security-crypto.md for cryptography, secrets, credentials, keys, or tokens.
 - rules/security-supply-chain.md for dependencies, packages, plugins, builds, deployments, or CI.
-- rules/angular.md for Angular work.
+- rules/angular/index.md for Angular work.
 - rules/typescript.md for TypeScript work.
 - rules/csharp.md for C# or .NET work.
-- rules/wpf.md for WPF work.
-- rules/ui-ux.md for UI or UX decisions.
+- rules/wpf/index.md for WPF work.
+- rules/ui-ux/index.md for UI or UX decisions.
 - rules/microsoft.md for Microsoft 365, Azure DevOps, or Teams work.
 - rules/git.md for Git operations.
 - rules/refactoring.md for refactoring work.
@@ -131,9 +131,15 @@ for i in "${!rule_skill_names[@]}"; do
   rule_file=${rule_skill_files[$i]}
   skill_name=${rule_skill_names[$i]}
   trigger=${rule_skill_triggers[$i]}
+  rule_source="$shared/rules/$rule_file"
+  rule_body="$rule_source"
+  [ -d "$rule_source" ] && rule_body="$rule_source/index.md"
   skill_dir="$output/claude-$platform/skills/rules/$skill_name"
   mkdir -p "$skill_dir"
-  { printf -- '---\nname: %s\ndescription: Use for %s.\n---\n\n' "$skill_name" "$trigger"; cat "$shared/rules/$rule_file"; } > "$skill_dir/SKILL.md"
+  { printf -- '---\nname: %s\ndescription: Use for %s.\n---\n\n' "$skill_name" "$trigger"; cat "$rule_body"; } > "$skill_dir/SKILL.md"
+  if [ -d "$rule_source/references" ]; then
+    copy_directory "$rule_source/references" "$skill_dir/references"
+  fi
   claude_rule_loading_list="${claude_rule_loading_list}- ${skill_name} for ${trigger}.
 "
 done