feat: Add AI tool building capabilities (#7336)

Github issue / Community forum post (link here to close automatically):
https://community.n8n.io/t/langchain-memory-chat/23733

---------

Signed-off-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Oleg Ivaniv <me@olegivaniv.com>
Co-authored-by: Val <68596159+valya@users.noreply.github.com>
Co-authored-by: Alex Grozav <alex@grozav.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: Deborah <deborah@starfallprojects.co.uk>
Co-authored-by: Jesper Bylund <mail@jesperbylund.com>
Co-authored-by: Jon <jonathan.bennetts@gmail.com>
Co-authored-by: Michael Kret <88898367+michael-radency@users.noreply.github.com>
Co-authored-by: Giulio Andreini <andreini@netseven.it>
Co-authored-by: Mason Geloso <Mason.geloso@gmail.com>
Co-authored-by: Mason Geloso <hone@Masons-Mac-mini.local>
Co-authored-by: Mutasem Aldmour <mutasem@n8n.io>

cypress/fixtures/Floating_Nodes.json

@@ -0,0 +1,176 @@
+{
+  "name": "Floating Nodes",
+  "nodes": [
+    {
+      "parameters": {},
+      "id": "d0eda550-2526-42a1-aa19-dee411c8acf9",
+      "name": "When clicking \"Execute Workflow\"",
+      "type": "n8n-nodes-base.manualTrigger",
+      "typeVersion": 1,
+      "position": [
+        700,
+        560
+      ]
+    },
+    {
+      "parameters": {
+        "options": {}
+      },
+      "id": "30412165-1229-4b21-9890-05bfbd9952ab",
+      "name": "Node 1",
+      "type": "n8n-nodes-base.set",
+      "typeVersion": 3.2,
+      "position": [
+        920,
+        560
+      ]
+    },
+    {
+      "parameters": {
+        "options": {}
+      },
+      "id": "201cc8fc-3124-47a3-bc08-b3917c1ddcd9",
+      "name": "Node 2",
+      "type": "n8n-nodes-base.set",
+      "typeVersion": 3.2,
+      "position": [
+        1100,
+        560
+      ]
+    },
+    {
+      "parameters": {
+        "options": {}
+      },
+      "id": "a29802bb-a284-495d-9917-6c6e42fef01e",
+      "name": "Node 3",
+      "type": "n8n-nodes-base.set",
+      "typeVersion": 3.2,
+      "position": [
+        1280,
+        560
+      ]
+    },
+    {
+      "parameters": {
+        "options": {}
+      },
+      "id": "a95a72b3-8b39-44e2-a05b-d8d677741c80",
+      "name": "Node 4",
+      "type": "n8n-nodes-base.set",
+      "typeVersion": 3.2,
+      "position": [
+        1440,
+        560
+      ]
+    },
+    {
+      "parameters": {},
+      "id": "4674f10d-6144-4a17-bbbb-350c3974438e",
+      "name": "Chain",
+      "type": "@n8n/n8n-nodes-langchain.chainLlm",
+      "typeVersion": 1,
+      "position": [
+        1580,
+        560
+      ]
+    },
+    {
+      "parameters": {
+        "options": {}
+      },
+      "id": "58e12ea5-bd3e-4abf-abec-fcfb5c0a7955",
+      "name": "Model",
+      "type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
+      "typeVersion": 1,
+      "position": [
+        1600,
+        740
+      ]
+    }
+  ],
+  "pinData": {},
+  "connections": {
+    "When clicking \"Execute Workflow\"": {
+      "main": [
+        [
+          {
+            "node": "Node 1",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Node 1": {
+      "main": [
+        [
+          {
+            "node": "Node 2",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Node 3": {
+      "main": [
+        [
+          {
+            "node": "Node 4",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Node 2": {
+      "main": [
+        [
+          {
+            "node": "Node 3",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Chain": {
+      "main": [
+        []
+      ]
+    },
+    "Model": {
+      "ai_languageModel": [
+        [
+          {
+            "node": "Chain",
+            "type": "ai_languageModel",
+            "index": 0
+          }
+        ]
+      ]
+    },
+    "Node 4": {
+      "main": [
+        [
+          {
+            "node": "Chain",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    }
+  },
+  "active": false,
+  "settings": {
+    "executionOrder": "v1"
+  },
+  "versionId": "2730d156-a98a-4ac8-b481-5c16361fdba2",
+  "id": "6bzXMGxHuxeEaqsA",
+  "meta": {
+    "instanceId": "1838be0fa0389fbaf5e2e4aaedab4ddc79abc4175b433401abb22a281001b853"
+  },
+  "tags": []
+}