feat(handlers): enrich semantic error messages with prescriptive tool hints to prevent LLM hallucination traps

server/src/handlers/workspaces.rs

@@ -185,7 +185,7 @@ impl McpTool for DeleteSnippetHandler {
             drop(idx.delete_document(&req.name));
             Ok("Snippet deleted.".to_string())
         } else {
-            Err("Snippet not found.".to_string())
+            Err("Snippet not found. Please verify the snippet ID using search_snippets.".to_string())
         }
     }
 }