Class ChatAgentOutputParser

A class that extends the AgentActionOutputParser to parse the output of the ChatAgent in LangChain. It checks if the output text contains the final answer action or a JSON response, and parses it accordingly.

Example

const prompt = ChatPromptTemplate.fromMessages([
  [
    "ai",
    `{PREFIX}
{FORMAT_INSTRUCTIONS}
{SUFFIX}`,
  ],
  ["human", "Question: {input}"],
]);
const runnableAgent = RunnableSequence.from([
  {
    input: (i: { input: string; steps: AgentStep[] }) => i.input,
    agent_scratchpad: (i: { input: string; steps: AgentStep[] }) =>
      formatLogToString(i.steps),
  },
  prompt,
  new OpenAI({ temperature: 0 }),
  new ChatAgentOutputParser(),
]);

const executor = AgentExecutor.fromAgentAndTools({
  agent: runnableAgent,
  tools: [new SerpAPI(), new Calculator()],
});

const result = await executor.invoke({
  input:
    "Who is Olivia Wilde's boyfriend? What is his current age raised to the 0.23 power?",
});
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