feat: add thinking budget parameter support for ChatGoogleVertexAI (#4557)

* chore: update @langchain/google-vertexai add thinkingBudget parameter support

* Update pnpm-lock.yaml

* Update pnpm-lock.yaml

---------

Co-authored-by: Henry <[email protected]>
Co-authored-by: Henry Heng <[email protected]>

Author: EienYuki

packages/components/nodes/chatmodels/ChatGoogleVertexAI/ChatGoogleVertexAI.ts

@@ -65,7 +65,7 @@ class GoogleVertexAI_ChatModels implements INode {
     constructor() {
         this.label = 'ChatGoogleVertexAI'
         this.name = 'chatGoogleVertexAI'
-        this.version = 5.1
+        this.version = 5.2
         this.type = 'ChatGoogleVertexAI'
         this.icon = 'GoogleVertex.svg'
         this.category = 'Chat Models'
@@ -151,6 +151,16 @@ class GoogleVertexAI_ChatModels implements INode {
                 step: 1,
                 optional: true,
                 additionalParams: true
+            },
+            {
+                label: 'Thinking Budget',
+                name: 'thinkingBudget',
+                type: 'number',
+                description: 'Number of tokens to use for thinking process (0 to disable)',
+                step: 1,
+                placeholder: '1024',
+                optional: true,
+                additionalParams: true
             }
         ]
     }
@@ -192,6 +202,7 @@ class GoogleVertexAI_ChatModels implements INode {
         const cache = nodeData.inputs?.cache as BaseCache
         const topK = nodeData.inputs?.topK as string
         const streaming = nodeData.inputs?.streaming as boolean
+        const thinkingBudget = nodeData.inputs?.thinkingBudget as string
 
         const allowImageUploads = nodeData.inputs?.allowImageUploads as boolean
 
@@ -211,6 +222,7 @@ class GoogleVertexAI_ChatModels implements INode {
         if (topP) obj.topP = parseFloat(topP)
         if (cache) obj.cache = cache
         if (topK) obj.topK = parseFloat(topK)
+        if (thinkingBudget) obj.thinkingBudget = parseInt(thinkingBudget, 10)
 
         const model = new ChatVertexAI(nodeData.id, obj)
         model.setMultiModalOption(multiModalOption)

packages/components/package.json

@@ -45,7 +45,7 @@
         "@langchain/core": "0.3.61",
         "@langchain/exa": "^0.0.5",
         "@langchain/google-genai": "0.2.3",
-        "@langchain/google-vertexai": "^0.2.0",
+        "@langchain/google-vertexai": "^0.2.10",
         "@langchain/groq": "0.1.2",
         "@langchain/langgraph": "^0.0.22",
         "@langchain/mistralai": "^0.2.0",