Enhancement: Add available skills list to SkillsTool description

[MengJiapeng]

Feature Request / Enhancement

Problem Description
The current SkillsTool in veadk/tools/skills_tools/skills_tool.py doesn't display available skills in its tool description. This makes it difficult for the LLM to know which skills are available to invoke.

Solution Implemented

• Enhance the _generate_description() method to include the list of available skills
• Display skills in <available_skills> format with <name> and <description> tags
• This helps the LLM understand what skills are available and how to invoke them

Changes Made

--- a/veadk/tools/skills_tools/skills_tool.py
+++ b/veadk/tools/skills_tools/skills_tool.py
@@ -65,8 +65,18 @@ class SkillsTool(BaseTool):
             "- If not specified, scripts are located in the skill-name/scripts subdirectory\n"
             "</skills_instructions>\n\n"
         )
 
+        available_skills_description = "<available_skills>\n"
+        for skill_name, skill in self.skills.items():
+            available_skills_description += (
+                f"  <skill>\n"
+                f"    <name>{skill_name}</name>\n"
+                f"    <description>{skill.description}</description>\n"
+                f"  </skill>\n"
+            )
+        available_skills_description += "</available_skills>"
+
         return base_description
+        return base_description + available_skills_description

Expected Behavior
After this enhancement, when the LLM receives the tool description for skills_tool, it will see a complete list of available skills with their names and descriptions, making it easier to select and invoke the appropriate skill for the task at hand.

Additional Context
This is a follow-up to previous work on the skills feature, improving discoverability and usability for AI agents.