Polish email and cookbook flows

src/tool_index.py

@@ -65,7 +65,7 @@ BUILTIN_TOOL_DESCRIPTIONS: Dict[str, str] = {
     "web_fetch": "Fetch and read the text content of a specific URL/website the user names (e.g. 'check example.com', 'open this link'). Use when you have a concrete URL; for open-ended lookups use web_search instead.",
     "read_file": "Read a file from disk and return its contents. View source code, config files, logs.",
     "write_file": "Write content to a file on disk. Create new files, save output, update configs.",
-    "create_document": "Create a new document in the editor panel. For code, articles, text content longer than 15 lines. Specify title, language, and content.",
+    "create_document": "Create a new document in the editor panel. For code, articles, text content longer than 15 lines, unless an already-open document/email draft is the obvious target. If an email compose draft is open, edit that draft instead of creating another document.",
     "edit_document": "Preferred tool for editing an existing document — targeted find-and-replace. Use for any small change: add a function, fix a bug, tweak a section, rename things.",
     "update_document": "Replace the entire active document content. ONLY for full rewrites (>50% changed). Do not use for small edits — use edit_document instead.",
     "suggest_document": "Suggest changes to the active document with explanations. For code review, proofreading, feedback requests.",