Bugfix/Pass state to tool node for agents (#3139)

pass state to tool node for agents

packages/components/nodes/sequentialagents/Agent/Agent.ts

@@ -18,7 +18,8 @@ import {
     ISeqAgentNode,
     IDatabaseEntity,
     IUsedTool,
-    IDocument
+    IDocument,
+    IStateWithMessages
 } from '../../../src/Interface'
 import { ToolCallingAgentOutputParser, AgentExecutor, SOURCE_DOCUMENTS_PREFIX } from '../../../src/agents'
 import { getInputVariables, getVars, handleEscapeCharacters, prepareSandboxVars } from '../../../src/utils'
@@ -34,6 +35,7 @@ import {
 } from '../commonUtils'
 import { END, StateGraph } from '@langchain/langgraph'
 import { StructuredTool } from '@langchain/core/tools'
+import { DynamicStructuredTool } from '../../tools/CustomTool/core'
 
 const defaultApprovalPrompt = `You are about to execute tool: {tools}. Ask if user want to proceed`
 const examplePrompt = 'You are a research assistant who can search for up-to-date info using search engine.'
@@ -904,18 +906,44 @@ class ToolNode<T extends BaseMessage[] | MessagesState> extends RunnableCallable
     }
 
     private async run(input: BaseMessage[] | MessagesState, config: RunnableConfig): Promise<BaseMessage[] | MessagesState> {
-        const message = Array.isArray(input) ? input[input.length - 1] : input.messages[input.messages.length - 1]
+        let messages: BaseMessage[]
+
+        // Check if input is an array of BaseMessage[]
+        if (Array.isArray(input)) {
+            messages = input
+        }
+        // Check if input is IStateWithMessages
+        else if ((input as IStateWithMessages).messages) {
+            messages = (input as IStateWithMessages).messages
+        }
+        // Handle MessagesState type
+        else {
+            messages = (input as MessagesState).messages
+        }
+
+        // Get the last message
+        const message = messages[messages.length - 1]
 
         if (message._getType() !== 'ai') {
             throw new Error('ToolNode only accepts AIMessages as input.')
         }
 
+        // Extract all properties except messages for IStateWithMessages
+        const { messages: _, ...inputWithoutMessages } = Array.isArray(input) ? { messages: input } : input
+        const ChannelsWithoutMessages = {
+            state: inputWithoutMessages
+        }
+
         const outputs = await Promise.all(
             (message as AIMessage).tool_calls?.map(async (call) => {
                 const tool = this.tools.find((tool) => tool.name === call.name)
                 if (tool === undefined) {
                     throw new Error(`Tool ${call.name} not found.`)
                 }
+                if (tool && tool instanceof DynamicStructuredTool) {
+                    // @ts-ignore
+                    tool.setFlowObject(ChannelsWithoutMessages)
+                }
                 let output = await tool.invoke(call.args, config)
                 let sourceDocuments: Document[] = []
                 if (output?.includes(SOURCE_DOCUMENTS_PREFIX)) {