Bugfix/Escape JSON in Prompt Message (#3901)

add fix to only get variables when there is no colon

packages/components/nodes/agents/ToolAgent/ToolAgent.ts

@@ -7,7 +7,13 @@ import { BaseChatModel } from '@langchain/core/language_models/chat_models'
 import { ChatPromptTemplate, MessagesPlaceholder, HumanMessagePromptTemplate, PromptTemplate } from '@langchain/core/prompts'
 import { formatToOpenAIToolMessages } from 'langchain/agents/format_scratchpad/openai_tools'
 import { type ToolsAgentStep } from 'langchain/agents/openai/output_parser'
-import { extractOutputFromArray, getBaseClasses, handleEscapeCharacters, removeInvalidImageMarkdown } from '../../../src/utils'
+import {
+    extractOutputFromArray,
+    getBaseClasses,
+    handleEscapeCharacters,
+    removeInvalidImageMarkdown,
+    transformBracesWithColon
+} from '../../../src/utils'
 import {
     FlowiseMemory,
     ICommonObject,
@@ -236,13 +242,15 @@ const prepareAgent = async (
     const model = nodeData.inputs?.model as BaseChatModel
     const maxIterations = nodeData.inputs?.maxIterations as string
     const memory = nodeData.inputs?.memory as FlowiseMemory
-    const systemMessage = nodeData.inputs?.systemMessage as string
+    let systemMessage = nodeData.inputs?.systemMessage as string
     let tools = nodeData.inputs?.tools
     tools = flatten(tools)
     const memoryKey = memory.memoryKey ? memory.memoryKey : 'chat_history'
     const inputKey = memory.inputKey ? memory.inputKey : 'input'
     const prependMessages = options?.prependMessages
 
+    systemMessage = transformBracesWithColon(systemMessage)
+
     let prompt = ChatPromptTemplate.fromMessages([
         ['system', systemMessage],
         new MessagesPlaceholder(memoryKey),