fix: improve skill system prompts and simplify tool descriptions

- Simplify skill-creator installation flow
- Refine skill selection prompt for better matching
- Add parameter alias and env variable hints for tools
- Skip linkai-agent when unconfigured
- Create skills/ dir in workspace on init

agent/skills/formatter.py

@@ -23,18 +23,15 @@ def format_skills_for_prompt(skills: List[Skill]) -> str:
         return ""
     
     lines = [
-        "\n\nThe following skills provide specialized instructions for specific tasks.",
-        "Use the read tool to load a skill's file when the task matches its description.",
         "",
         "<available_skills>",
     ]
-    
+
     for skill in visible_skills:
         lines.append("  <skill>")
         lines.append(f"    <name>{_escape_xml(skill.name)}</name>")
         lines.append(f"    <description>{_escape_xml(skill.description)}</description>")
         lines.append(f"    <location>{_escape_xml(skill.file_path)}</location>")
-        lines.append(f"    <base_dir>{_escape_xml(skill.base_dir)}</base_dir>")
         lines.append("  </skill>")
     
     lines.append("</available_skills>")

agent/skills/loader.py

@@ -188,16 +188,14 @@ class SkillLoader:
         import json
         
         config_path = os.path.join(skill_dir, "config.json")
-        template_path = os.path.join(skill_dir, "config.json.template")
         
-        # Try to load config.json or fallback to template
-        config_file = config_path if os.path.exists(config_path) else template_path
-        
-        if not os.path.exists(config_file):
-            return default_description
+        # Without config.json, skip this skill entirely (return empty to trigger exclusion)
+        if not os.path.exists(config_path):
+            logger.debug(f"[SkillLoader] linkai-agent skipped: no config.json found")
+            return ""
         
         try:
-            with open(config_file, 'r', encoding='utf-8') as f:
+            with open(config_path, 'r', encoding='utf-8') as f:
                 config = json.load(f)
             
             apps = config.get("apps", [])