Add new skills descriptions and enhance skills tool functionality

- Added detailed descriptions for new skills categories: Machine Learning Operations and Note Taking.
- Introduced a new Obsidian skill with commands for reading, listing, searching, creating, and appending notes.
- Enhanced the skills tool to load and display category descriptions from DESCRIPTION.md files, improving user guidance and discovery of available skills.

TODO.md

@@ -276,6 +276,26 @@ These items need to be addressed ASAP:
 
 ### Medium-Impact
 
+- [ ] **Canvas / Visual Workspace** 🖼️
+  - Agent-controlled visual panel for rendering interactive UI
+  - Inspired by OpenClaw's Canvas feature
+  - **Capabilities:**
+    - `present` / `hide` - Show/hide the canvas panel
+    - `navigate` - Load HTML files or URLs into the canvas
+    - `eval` - Execute JavaScript in the canvas context
+    - `snapshot` - Capture the rendered UI as an image
+  - **Use cases:**
+    - Display generated HTML/CSS/JS previews
+    - Show interactive data visualizations (charts, graphs)
+    - Render diagrams (Mermaid → rendered output)
+    - Present structured information in rich format
+    - A2UI-style component system for structured agent UI
+  - **Implementation options:**
+    - Electron-based panel for CLI
+    - WebSocket-connected web app
+    - VS Code webview extension
+  - *Would let agent "show" things rather than just describe them*
+
 - [ ] **Document Generation** 📄
   - Create styled PDFs, Word docs, presentations
   - *Can do basic PDF via terminal tools, but limited*

skills/mlops/DESCRIPTION.md

@@ -0,0 +1,3 @@
+---
+description: Knowledge and Tools for Machine Learning Operations - tools and frameworks for training, fine-tuning, deploying, and optimizing ML/AI models
+---

skills/note-taking/DESCRIPTION.md

@@ -0,0 +1,3 @@
+---
+description: Note taking skills, to save information, assist with research, and collab on multi-session planning and information sharing.
+---

skills/note-taking/obsidian/SKILL.md

@@ -0,0 +1,57 @@
+---
+name: obsidian
+description: Read, search, and create notes in the Obsidian vault.
+---
+
+# Obsidian Vault
+
+**Location:** `/home/teknium/Documents/Primary Vault`
+
+Note: Path contains a space - always quote it.
+
+## Read a note
+
+```bash
+cat "/home/teknium/Documents/Primary Vault/Note Name.md"
+```
+
+## List notes
+
+```bash
+# All notes
+find "/home/teknium/Documents/Primary Vault" -name "*.md" -type f
+
+# In a specific folder
+ls "/home/teknium/Documents/Primary Vault/AI Research/"
+```
+
+## Search
+
+```bash
+# By filename
+find "/home/teknium/Documents/Primary Vault" -name "*.md" -iname "*keyword*"
+
+# By content
+grep -rli "keyword" "/home/teknium/Documents/Primary Vault" --include="*.md"
+```
+
+## Create a note
+
+```bash
+cat > "/home/teknium/Documents/Primary Vault/New Note.md" << 'ENDNOTE'
+# Title
+
+Content here.
+ENDNOTE
+```
+
+## Append to a note
+
+```bash
+echo "
+New content here." >> "/home/teknium/Documents/Primary Vault/Existing Note.md"
+```
+
+## Wikilinks
+
+Obsidian links notes with `[[Note Name]]` syntax. When creating notes, use these to link related content.

tools/skills_tool.py

@@ -312,17 +312,56 @@ def _find_all_skills() -> List[Dict[str, Any]]:
     return skills
 
 
+def _load_category_description(category_dir: Path) -> Optional[str]:
+    """
+    Load category description from DESCRIPTION.md if it exists.
+    
+    Args:
+        category_dir: Path to the category directory
+        
+    Returns:
+        Description string or None if not found
+    """
+    desc_file = category_dir / "DESCRIPTION.md"
+    if not desc_file.exists():
+        return None
+    
+    try:
+        content = desc_file.read_text(encoding='utf-8')
+        # Parse frontmatter if present
+        frontmatter, body = _parse_frontmatter(content)
+        
+        # Prefer frontmatter description, fall back to first non-header line
+        description = frontmatter.get('description', '')
+        if not description:
+            for line in body.strip().split('\n'):
+                line = line.strip()
+                if line and not line.startswith('#'):
+                    description = line
+                    break
+        
+        # Truncate to reasonable length
+        if len(description) > MAX_DESCRIPTION_LENGTH:
+            description = description[:MAX_DESCRIPTION_LENGTH - 3] + "..."
+        
+        return description if description else None
+    except Exception:
+        return None
+
+
 def skills_categories(task_id: str = None) -> str:
     """
-    List available skill categories (progressive disclosure tier 0).
+    List available skill categories with descriptions (progressive disclosure tier 0).
     
-    Returns just category names for efficient discovery before filtering.
+    Returns category names and descriptions for efficient discovery before drilling down.
+    Categories can have a DESCRIPTION.md file with a description frontmatter field
+    or first paragraph to explain what skills are in that category.
     
     Args:
         task_id: Optional task identifier (unused, for API consistency)
         
     Returns:
-        JSON string with list of category names
+        JSON string with list of categories and their descriptions
     """
     try:
         if not SKILLS_DIR.exists():
@@ -333,16 +372,36 @@ def skills_categories(task_id: str = None) -> str:
             }, ensure_ascii=False)
         
         # Scan for categories (top-level directories containing skills)
-        categories = set()
+        category_dirs = {}
         for skill_md in SKILLS_DIR.rglob("SKILL.md"):
             category = _get_category_from_path(skill_md)
             if category:
-                categories.add(category)
+                category_dir = SKILLS_DIR / category
+                if category not in category_dirs:
+                    category_dirs[category] = category_dir
+        
+        # Build category list with descriptions
+        categories = []
+        for name in sorted(category_dirs.keys()):
+            category_dir = category_dirs[name]
+            description = _load_category_description(category_dir)
+            
+            # Count skills in this category
+            skill_count = sum(1 for _ in category_dir.rglob("SKILL.md"))
+            
+            cat_entry = {
+                "name": name,
+                "skill_count": skill_count
+            }
+            if description:
+                cat_entry["description"] = description
+            
+            categories.append(cat_entry)
         
         return json.dumps({
             "success": True,
-            "categories": sorted(categories),
-            "hint": "Use skills_list(category) to see skills in a category"
+            "categories": categories,
+            "hint": "If a category is relevant to your task, use skills_list with that category to see available skills"
         }, ensure_ascii=False)
         
     except Exception as e: