build(rules): generate skills from nested topics

scripts/commands/build.ps1

@@ -100,16 +100,29 @@ foreach ($shell in @('powershell','bash')) {
         $ruleSkills += [pscustomobject]@{ Name = "rules-$($ruleFile.BaseName)"; Body = $ruleFile.FullName; References = $null }
     }
     foreach ($ruleDirectory in Get-ChildItem $rulesRoot -Directory) {
-        $ruleBody = Join-Path $ruleDirectory.FullName 'index.md'
-        if (Test-Path -LiteralPath $ruleBody) {
-            $ruleSkills += [pscustomobject]@{ Name = "rules-$($ruleDirectory.Name)"; Body = $ruleBody; References = (Join-Path $ruleDirectory.FullName 'references') }
+        foreach ($ruleFile in Get-ChildItem $ruleDirectory.FullName -File -Filter '*.md' -Recurse) {
+            $relativeRulePath = $ruleFile.FullName.Substring($ruleDirectory.FullName.Length).TrimStart([char[]]@('\','/'))
+            if ($relativeRulePath -eq 'index.md') {
+                $ruleName = "rules-$($ruleDirectory.Name)"
+                $references = Join-Path $ruleDirectory.FullName 'references'
+            } else {
+                $ruleParts = $relativeRulePath.Substring(0, $relativeRulePath.Length - 3).Split([char[]]@('\','/'))
+                if ($ruleParts[0] -eq 'references') { $ruleParts = @($ruleParts | Select-Object -Skip 1) }
+                $ruleName = "rules-$($ruleDirectory.Name)-$($ruleParts -join '-')"
+                $references = $null
+            }
+            if ($ruleSkills.Name -contains $ruleName) { throw "Duplicate generated rule skill name: $ruleName" }
+            $ruleSkills += [pscustomobject]@{ Name = $ruleName; Body = $ruleFile.FullName; References = $references }
         }
     }
     foreach ($ruleSkill in $ruleSkills | Sort-Object Name) {
         $skillDir = Join-Path $output "claude-$shell/skills/rules/$($ruleSkill.Name)"
         New-Item $skillDir -ItemType Directory -Force | Out-Null
         $ruleContent = Get-Content $ruleSkill.Body -Raw
-        $skillBody = "---`r`nname: $($ruleSkill.Name)`r`ndescription: $(Quote-Toml 'Use when its matching rule condition in global instructions applies.')`r`n---`r`n`r`n$ruleContent"
+        $ruleTitle = (Get-Content $ruleSkill.Body | Where-Object { $_ -match '^#+\s+' } | Select-Object -First 1) -replace '^#+\s+', ''
+        if ([string]::IsNullOrWhiteSpace($ruleTitle)) { throw "Missing rule title in $($ruleSkill.Body)" }
+        $ruleDescription = "Use when the task concerns $ruleTitle."
+        $skillBody = "---`r`nname: $($ruleSkill.Name)`r`ndescription: $(Quote-Toml $ruleDescription)`r`n---`r`n`r`n$ruleContent"
         Set-Content (Join-Path $skillDir 'SKILL.md') $skillBody -Encoding UTF8
         if ($ruleSkill.References -and (Test-Path -LiteralPath $ruleSkill.References)) {
             Copy-Directory $ruleSkill.References (Join-Path $skillDir 'references')

scripts/commands/build.sh

@@ -69,20 +69,39 @@ copy_directory "$shared/hooks" "$output/codex-$shell/hooks"
 copy_directory "$shared/hooks" "$output/claude-$shell/hooks"
 copy_directory "$shared/statusline" "$output/claude-$shell/statusline"
 
+declare -A rule_skill_names=()
 while IFS= read -r rule_path; do
   case "$rule_path" in
     general.md) continue ;;
     */index.md) skill_name="rules-${rule_path%/index.md}"; rule_body="$shared/rules/$rule_path"; references_dir="${rule_body%/index.md}/references" ;;
+    */*.md)
+      rule_directory=${rule_path%%/*}
+      rule_relative=${rule_path#*/}
+      rule_relative=${rule_relative%.md}
+      rule_relative=${rule_relative#references/}
+      rule_relative=${rule_relative//\//-}
+      skill_name="rules-$rule_directory-$rule_relative"
+      rule_body="$shared/rules/$rule_path"
+      references_dir=''
+      ;;
     *.md) skill_name="rules-${rule_path%.md}"; rule_body="$shared/rules/$rule_path"; references_dir='' ;;
     *) continue ;;
   esac
+  if [[ -n "${rule_skill_names[$skill_name]:-}" ]]; then
+    printf 'Duplicate generated rule skill name: %s\n' "$skill_name" >&2
+    exit 1
+  fi
+  rule_skill_names[$skill_name]=1
   skill_dir="$output/claude-$shell/skills/rules/$skill_name"
   mkdir -p "$skill_dir"
-  { printf -- '---\nname: %s\ndescription: %s\n---\n\n' "$skill_name" "$(quote_toml 'Use when its matching rule condition in global instructions applies.')"; cat "$rule_body"; } > "$skill_dir/SKILL.md"
+  rule_title=$(sed -n 's/^#\{1,6\} *//p' "$rule_body" | head -n 1)
+  if [ -z "$rule_title" ]; then printf 'Missing rule title in %s\n' "$rule_body" >&2; exit 1; fi
+  rule_description="Use when the task concerns $rule_title."
+  { printf -- '---\nname: %s\ndescription: %s\n---\n\n' "$skill_name" "$(quote_toml "$rule_description")"; cat "$rule_body"; } > "$skill_dir/SKILL.md"
   if [ -n "$references_dir" ] && [ -d "$references_dir" ]; then
     copy_directory "$references_dir" "$skill_dir/references"
   fi
-done < <(find "$shared/rules" -mindepth 1 -maxdepth 2 -type f -name '*.md' -printf '%P\n' | sort)
+done < <(find "$shared/rules" -mindepth 1 -type f -name '*.md' -printf '%P\n' | sort)
 
 shared_template=$(<"$shared/global-instructions.md")
 general_content=$(<"$shared/rules/general.md")