fix(skills): remove broken document-writer skill, enhance document-editor

assistant/src/config/bundled-skills/document-editor/SKILL.md

@@ -110,6 +110,12 @@ Users can leave inline comments on documents. Open comments are surfaced in a `<
 3. Call `comment_resolve` on comments you have addressed.
 4. If a comment is ambiguous, call `comment_reply` to ask for clarification instead of guessing.
 
+## Anti-Patterns
+
+- **Don't use `app_create` for blog posts, articles, or written content.** Use `document_create` — apps are for interactive content with state/data.
+- **Don't output the full content in chat.** The content goes in the document editor, not in the chat response. Acknowledge what you're doing and stream to the editor.
+- **Don't wait to generate everything before sending.** Stream content in chunks via `document_update` with `mode: "append"` so users see progress in real time.
+
 ## Usage Notes
 
 - The `mode` parameter on `document_update` defaults to `append`.

skills/catalog.json

@@ -117,22 +117,6 @@
       "compatibility": "Designed for Vellum personal assistants",
       "updatedAt": "2026-05-12T14:56:19-04:00"
     },
-    {
-      "id": "document-writer",
-      "name": "document-writer",
-      "description": "Create and edit long-form documents like blog posts, articles, essays, and reports using the built-in rich text editor",
-      "metadata": {
-        "emoji": "📝",
-        "vellum": {
-          "display-name": "Document Writer",
-          "includes": [
-            "document"
-          ]
-        }
-      },
-      "compatibility": "Designed for Vellum personal assistants",
-      "updatedAt": "2026-04-08T14:52:29-04:00"
-    },
     {
       "id": "doordash",
       "name": "doordash",
@@ -426,7 +410,7 @@
           "feature-flag": "meet"
         }
       },
-      "updatedAt": "2026-05-26T18:33:11Z"
+      "updatedAt": "2026-05-26T14:56:40-04:00"
     },
     {
       "id": "meme-generator",