feat: add SKILL.md edit hook — warns to bump version in marketplace.json

Two hooks now active for marketplace-dev users:
1. Edit marketplace.json → auto-validate schema
2. Edit any SKILL.md → warn if version bump needed or skill unregistered

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -971,6 +971,15 @@
                 "command": "${CLAUDE_PLUGIN_ROOT}/scripts/post_edit_validate.sh"
               }
             ]
+          },
+          {
+            "matcher": "Write|Edit",
+            "hooks": [
+              {
+                "type": "command",
+                "command": "${CLAUDE_PLUGIN_ROOT}/scripts/post_edit_sync_check.sh"
+              }
+            ]
           }
         ]
       }

marketplace-dev/scripts/post_edit_sync_check.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+# PostToolUse hook: warn when SKILL.md is edited but marketplace.json version not bumped
+# Detects skill content changes that need a corresponding version bump in marketplace.json
+
+set -euo pipefail
+
+INPUT=$(cat)
+
+FILE_PATH=$(echo "$INPUT" | python3 -c "
+import json, sys
+try:
+    data = json.load(sys.stdin)
+    print(data.get('tool_input', {}).get('file_path', ''))
+except:
+    print('')
+" 2>/dev/null)
+
+# Only care about SKILL.md edits
+[[ "$FILE_PATH" != *"SKILL.md"* ]] && exit 0
+
+# Find the skill name from path (e.g., /repo/skills/dbs-hook/SKILL.md → dbs-hook)
+SKILL_DIR=$(dirname "$FILE_PATH")
+SKILL_NAME=$(basename "$SKILL_DIR")
+
+# Search for marketplace.json upward from the edited file
+SEARCH_DIR="$SKILL_DIR"
+MARKETPLACE_JSON=""
+while [[ "$SEARCH_DIR" != "/" ]]; do
+    if [[ -f "$SEARCH_DIR/.claude-plugin/marketplace.json" ]]; then
+        MARKETPLACE_JSON="$SEARCH_DIR/.claude-plugin/marketplace.json"
+        break
+    fi
+    SEARCH_DIR=$(dirname "$SEARCH_DIR")
+done
+
+[[ -z "$MARKETPLACE_JSON" ]] && exit 0
+
+# Check if this skill is registered and if version needs bumping
+python3 -c "
+import json, sys
+
+with open('$MARKETPLACE_JSON') as f:
+    data = json.load(f)
+
+skill_name = '$SKILL_NAME'
+found = False
+for p in data.get('plugins', []):
+    skills = p.get('skills', [])
+    for s in skills:
+        if s.rstrip('/').split('/')[-1] == skill_name:
+            found = True
+            version = p.get('version', 'unknown')
+            print(json.dumps({
+                'result': f'SKILL.md for \"{skill_name}\" was modified. Remember to bump its version in marketplace.json (currently {version}). Users on the old version won\\'t receive this update otherwise.'
+            }))
+            break
+    if found:
+        break
+
+if not found:
+    print(json.dumps({
+        'result': f'SKILL.md for \"{skill_name}\" was modified but this skill is NOT registered in marketplace.json. Add it if you want it installable via plugin marketplace.'
+    }))
+" 2>/dev/null