LangGraph agent

Author: amychisholm03

lib/llm-events-new/langgraph/agent.js

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2026 New Relic Corporation. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+const LlmEvent = require('../base')
+
+/**
+ * Encapsulates a `@langchain/langgraph` LlmAgent event.
+ */
+class LangGraphLlmAgent extends LlmEvent {
+  /**
+   *
+   * @param {object} params constructor parameters
+   * @param {Agent} params.agent New Relic agent instance
+   * @param {object} params.segment Current segment
+   * @param {object} params.transaction Current and active transaction
+   * @param {string} params.aiAgentName Name of the AI agent which can typically be captured through framework context
+   * @param {boolean} [params.error] Set to `true` if an error occurred during creation call, omitted if no error occurred
+   */
+  constructor({ agent, segment, transaction, aiAgentName, error }) {
+    super({ agent, segment, transaction, vendor: 'langgraph', error })
+    this.name = aiAgentName ?? 'agent'
+  }
+}
+
+module.exports = LangGraphLlmAgent

lib/llm-events/langgraph/agent.js

@@ -5,7 +5,7 @@
 
 const AiMonitoringSubscriber = require('../ai-monitoring/base')
 const LlmErrorMessage = require('#agentlib/llm-events/error-message.js')
-const LangGraphAgentEvent = require('#agentlib/llm-events/langgraph/agent.js')
+const LlmAgent = require('#agentlib/llm-events-new/langgraph/agent.js')
 const { AI: { LANGGRAPH, STREAMING_DISABLED } } = require('#agentlib/metrics/names.js')
 
 class LangGraphStreamSubscriber extends AiMonitoringSubscriber {
@@ -104,9 +104,9 @@ class LangGraphStreamSubscriber extends AiMonitoringSubscriber {
   recordAiAgentEvent({ aiAgentName, transaction, segment, error }) {
     const { agent } = this
     segment.end()
-    const agentEvent = new LangGraphAgentEvent({
+    const agentEvent = new LlmAgent({
       agent,
-      name: aiAgentName,
+      aiAgentName,
       transaction,
       segment,
       error: !!error

lib/subscribers/langgraph/graph-stream.js

@@ -7,7 +7,7 @@
 
 const test = require('node:test')
 const assert = require('node:assert')
-const LangGraphAgentEvent = require('../../../../lib/llm-events/langgraph/agent')
+const LlmAgent = require('#agentlib/llm-events-new/langgraph/agent.js')
 
 test.beforeEach((ctx) => {
   ctx.nr = {}
@@ -43,29 +43,28 @@ test.beforeEach((ctx) => {
     id: 'segment-1'
   }
 
-  ctx.nr.name = 'test-agent'
+  ctx.nr.aiAgentName = 'test-agent'
 })
 
 test('constructs default instance', async (t) => {
-  const event = new LangGraphAgentEvent(t.nr)
+  const event = new LlmAgent(t.nr)
   assert.equal(event.name, 'test-agent')
   assert.match(event.id, /[a-z0-9-]{36}/)
   assert.equal(event.span_id, 'segment-1')
   assert.equal(event.trace_id, 'trace-1')
   assert.equal(event['llm.foo'], 'bar')
   assert.equal(event.ingest_source, 'Node')
   assert.equal(event.vendor, 'langgraph')
-  assert.equal(event.error, false)
 })
 
 test('constructs instance with error', async (t) => {
   t.nr.error = true
-  const event = new LangGraphAgentEvent(t.nr)
+  const event = new LlmAgent(t.nr)
   assert.equal(event.error, true)
 })
 
 test('uses default name when not provided', async (t) => {
-  delete t.nr.name
-  const event = new LangGraphAgentEvent(t.nr)
+  delete t.nr.aiAgentName
+  const event = new LlmAgent(t.nr)
   assert.equal(event.name, 'agent')
 })