Wrap the top-level function with `@observe`, set trace-level fields with `update_current_trace(...)`, and wrap inner functions you want to grade with `@observe` too. Attach a component metric by passing `metrics=[...]` to `@observe` and registering its test case with `update_current_span(test_case=...)`: ```python title="main.py" showLineNumbers import asyncio from deepeval.tracing import observe, update_current_span, update_current_trace from deepeval.test_case import LLMTestCase from deepeval.metrics import AnswerRelevancyMetric ... @observe() async def my_ai_agent(query: str) -> str: chunks = await retrieve(query) answer = await generate(query, chunks) update_current_trace(input=query, output=answer) return answer @observe() async def retrieve(query: str) -> list[str]: return ["..."] @observe(metrics=[AnswerRelevancyMetric()]) async def generate(query: str, chunks: list[str]) -> str: response = "..." # await your LLM call here with `query` and `chunks` update_current_span( test_case=LLMTestCase(input=query, actual_output=response, retrieval_context=chunks), ) return response for golden in dataset.evals_iterator(): task = asyncio.create_task(my_ai_agent(golden.input)) dataset.evaluate(task) ``` ```python title="main.py" showLineNumbers from deepeval.evaluate import AsyncConfig from deepeval.tracing import observe, update_current_span, update_current_trace from deepeval.test_case import LLMTestCase from deepeval.metrics import AnswerRelevancyMetric ... @observe() def my_ai_agent(query: str) -> str: chunks = retrieve(query) answer = generate(query, chunks) update_current_trace(input=query, output=answer) return answer @observe() def retrieve(query: str) -> list[str]: return ["..."] @observe(metrics=[AnswerRelevancyMetric()]) def generate(query: str, chunks: list[str]) -> str: response = "..." # call your LLM here with `query` and `chunks` update_current_span( test_case=LLMTestCase(input=query, actual_output=response, retrieval_context=chunks), ) return response for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): my_ai_agent(golden.input) ``` The same pattern works on any `@observe`'d function — retrievers, tool wrappers, sub-agents. See [tracing](/docs/evaluation-llm-tracing) for the full surface. Build your agent with `create_agent`, then pass `deepeval`'s `CallbackHandler` to its `invoke` / `ainvoke` method inside the loop. Stage a component metric for the next LLM call with `next_llm_span(...)` — the `CallbackHandler` drains it onto the first LLM span LangChain opens during the agent run: ```python title="langchain_app.py" showLineNumbers import asyncio from langchain.agents import create_agent from deepeval.tracing import next_llm_span from deepeval.integrations.langchain import CallbackHandler from deepeval.metrics import AnswerRelevancyMetric ... def multiply(a: int, b: int) -> int: """Multiply two numbers.""" return a * b agent = create_agent( model="openai:gpt-4o-mini", tools=[multiply], system_prompt="Be concise.", ) async def run_agent(prompt: str): with next_llm_span(metrics=[AnswerRelevancyMetric()]): return await agent.ainvoke( {"messages": [{"role": "user", "content": prompt}]}, config={"callbacks": [CallbackHandler()]}, ) for golden in dataset.evals_iterator(): task = asyncio.create_task(run_agent(golden.input)) dataset.evaluate(task) ``` ```python title="langchain_app.py" showLineNumbers from langchain.agents import create_agent from deepeval.tracing import next_llm_span from deepeval.evaluate import AsyncConfig from deepeval.integrations.langchain import CallbackHandler from deepeval.metrics import AnswerRelevancyMetric ... def multiply(a: int, b: int) -> int: """Multiply two numbers.""" return a * b agent = create_agent( model="openai:gpt-4o-mini", tools=[multiply], system_prompt="Be concise.", ) for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with next_llm_span(metrics=[AnswerRelevancyMetric()]): agent.invoke( {"messages": [{"role": "user", "content": golden.input}]}, config={"callbacks": [CallbackHandler()]}, ) ``` `next_llm_span` is one-shot — only the first LLM span in the agent run picks up the metric, so later turns inside `create_agent`'s loop won't be scored. To score every LLM call, drive the loop yourself (`next_llm_span` per `agent.invoke(...)`) or score end-to-end with trace-level metrics on `CallbackHandler(metrics=[...])`. For retrievers, use `next_retriever_span(...)` the same way; for deterministic tool calls, prefer `next_tool_span(...)` + `update_current_span(...)`. See the [LangChain integration](/integrations/frameworks/langchain) for the full surface. Wire your `StateGraph`, then pass `deepeval`'s `CallbackHandler` to its `invoke` / `ainvoke` method inside the loop. Stage a component metric for the next LLM call with `next_llm_span(...)` — the `CallbackHandler` drains it onto the first LLM span LangGraph opens during the graph run: ```python title="langgraph_app.py" showLineNumbers import asyncio from langchain.chat_models import init_chat_model from langgraph.graph import StateGraph, MessagesState, START, END from deepeval.tracing import next_llm_span from deepeval.integrations.langchain import CallbackHandler from deepeval.metrics import AnswerRelevancyMetric ... llm = init_chat_model("openai:gpt-4o-mini") async def chatbot(state: MessagesState): return {"messages": [await llm.ainvoke(state["messages"])]} graph = ( StateGraph(MessagesState) .add_node(chatbot) .add_edge(START, "chatbot") .add_edge("chatbot", END) .compile() ) async def run_graph(prompt: str): with next_llm_span(metrics=[AnswerRelevancyMetric()]): return await graph.ainvoke( {"messages": [{"role": "user", "content": prompt}]}, config={"callbacks": [CallbackHandler()]}, ) for golden in dataset.evals_iterator(): task = asyncio.create_task(run_graph(golden.input)) dataset.evaluate(task) ``` ```python title="langgraph_app.py" showLineNumbers from langchain.chat_models import init_chat_model from langgraph.graph import StateGraph, MessagesState, START, END from deepeval.tracing import next_llm_span from deepeval.evaluate import AsyncConfig from deepeval.integrations.langchain import CallbackHandler from deepeval.metrics import AnswerRelevancyMetric ... llm = init_chat_model("openai:gpt-4o-mini") def chatbot(state: MessagesState): return {"messages": [llm.invoke(state["messages"])]} graph = ( StateGraph(MessagesState) .add_node(chatbot) .add_edge(START, "chatbot") .add_edge("chatbot", END) .compile() ) for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with next_llm_span(metrics=[AnswerRelevancyMetric()]): graph.invoke( {"messages": [{"role": "user", "content": golden.input}]}, config={"callbacks": [CallbackHandler()]}, ) ``` `next_llm_span` is one-shot — only the first LLM span the graph emits picks up the metric, so later loop turns through the `chatbot` node won't be scored. To score every LLM call, drive the loop yourself (`next_llm_span` per `graph.invoke(...)`) or score end-to-end with trace-level metrics on `CallbackHandler(metrics=[...])`. See the [LangGraph integration](/integrations/frameworks/langgraph) for the full surface. Drop-in replace `from openai import OpenAI` with `from deepeval.openai import OpenAI` (or `AsyncOpenAI`). Every `chat.completions.create(...)`, `chat.completions.parse(...)`, and `responses.create(...)` call becomes an LLM span. Wrap a call in `with trace(llm_span_context=LlmSpanContext(metrics=[...])):` to stage a component metric for it: ```python title="openai_app.py" showLineNumbers import asyncio from deepeval.openai import AsyncOpenAI from deepeval.tracing import trace, LlmSpanContext from deepeval.metrics import AnswerRelevancyMetric ... client = AsyncOpenAI() async def call_openai(prompt: str): with trace(llm_span_context=LlmSpanContext(metrics=[AnswerRelevancyMetric()])): return await client.chat.completions.create( model="gpt-4o", messages=[{"role": "user", "content": prompt}], ) for golden in dataset.evals_iterator(): task = asyncio.create_task(call_openai(golden.input)) dataset.evaluate(task) ``` ```python title="openai_app.py" showLineNumbers from deepeval.openai import OpenAI from deepeval.tracing import trace, LlmSpanContext from deepeval.evaluate import AsyncConfig from deepeval.metrics import AnswerRelevancyMetric ... client = OpenAI() for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with trace(llm_span_context=LlmSpanContext(metrics=[AnswerRelevancyMetric()])): client.chat.completions.create( model="gpt-4o", messages=[{"role": "user", "content": golden.input}], ) ``` See the [OpenAI integration](/integrations/frameworks/openai) for streaming and tool-calling. Pass `DeepEvalInstrumentationSettings()` to your `Agent`'s `instrument` keyword. Stage a component metric for the next Pydantic-emitted span with `next_llm_span(...)` (LLM call) or `next_agent_span(...)` (agent span): ```python title="pydanticai_agent.py" showLineNumbers import asyncio from pydantic_ai import Agent from deepeval.tracing import next_llm_span from deepeval.integrations.pydantic_ai import DeepEvalInstrumentationSettings from deepeval.metrics import AnswerRelevancyMetric ... agent = Agent( "openai:gpt-4.1", system_prompt="Be concise.", instrument=DeepEvalInstrumentationSettings(), ) async def run_agent(prompt: str): with next_llm_span(metrics=[AnswerRelevancyMetric()]): return await agent.run(prompt) for golden in dataset.evals_iterator(): task = asyncio.create_task(run_agent(golden.input)) dataset.evaluate(task) ``` ```python title="pydanticai_agent.py" showLineNumbers from pydantic_ai import Agent from deepeval.tracing import next_llm_span from deepeval.evaluate import AsyncConfig from deepeval.integrations.pydantic_ai import DeepEvalInstrumentationSettings from deepeval.metrics import AnswerRelevancyMetric ... agent = Agent( "openai:gpt-4.1", system_prompt="Be concise.", instrument=DeepEvalInstrumentationSettings(), ) for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with next_llm_span(metrics=[AnswerRelevancyMetric()]): agent.run_sync(golden.input) ``` See the [Pydantic AI integration](/integrations/frameworks/pydanticai) for the full surface. Call `instrument_agentcore()` before creating your agent. The same call also instruments [Strands](https://strandsagents.com/) agents running inside AgentCore. Stage a component metric for the next AgentCore-emitted span with `next_agent_span(...)` or `next_llm_span(...)`: ```python title="agentcore_agent.py" showLineNumbers import asyncio from strands import Agent from deepeval.tracing import next_agent_span from deepeval.integrations.agentcore import instrument_agentcore from deepeval.metrics import TaskCompletionMetric ... instrument_agentcore() agent = Agent(model="amazon.nova-lite-v1:0") async def run_agent(prompt: str): with next_agent_span(metrics=[TaskCompletionMetric()]): return await agent.invoke_async(prompt) for golden in dataset.evals_iterator(): task = asyncio.create_task(run_agent(golden.input)) dataset.evaluate(task) ``` ```python title="agentcore_agent.py" showLineNumbers from strands import Agent from deepeval.tracing import next_agent_span from deepeval.evaluate import AsyncConfig from deepeval.integrations.agentcore import instrument_agentcore from deepeval.metrics import TaskCompletionMetric ... instrument_agentcore() agent = Agent(model="amazon.nova-lite-v1:0") for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with next_agent_span(metrics=[TaskCompletionMetric()]): agent(golden.input) ``` See the [AgentCore integration](/integrations/frameworks/agentcore) for the full surface (including the `BedrockAgentCoreApp` entrypoint pattern). Call `instrument_strands()` before invoking your Strands agent (for AgentCore-hosted Strands, use the AgentCore tab instead). Stage a component metric for the next Strands-emitted span with `next_agent_span(...)` or `next_llm_span(...)`: ```python title="strands_agent.py" showLineNumbers import asyncio from strands import Agent from strands.models.openai import OpenAIModel from deepeval.tracing import next_agent_span from deepeval.integrations.strands import instrument_strands from deepeval.metrics import TaskCompletionMetric ... instrument_strands() agent = Agent( model=OpenAIModel(model_id="gpt-4o-mini"), system_prompt="You are a helpful assistant.", ) async def run_agent(prompt: str): with next_agent_span(metrics=[TaskCompletionMetric()]): return await agent.invoke_async(prompt) for golden in dataset.evals_iterator(): task = asyncio.create_task(run_agent(golden.input)) dataset.evaluate(task) ``` ```python title="strands_agent.py" showLineNumbers from strands import Agent from strands.models.openai import OpenAIModel from deepeval.tracing import next_agent_span from deepeval.evaluate import AsyncConfig from deepeval.integrations.strands import instrument_strands from deepeval.metrics import TaskCompletionMetric ... instrument_strands() agent = Agent( model=OpenAIModel(model_id="gpt-4o-mini"), system_prompt="You are a helpful assistant.", ) for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with next_agent_span(metrics=[TaskCompletionMetric()]): agent(golden.input) ``` See the [Strands integration](/integrations/frameworks/strands) for the full surface. Drop-in replace `from anthropic import Anthropic` with `from deepeval.anthropic import Anthropic` (or `AsyncAnthropic`). Wrap a call in `with trace(llm_span_context=LlmSpanContext(metrics=[...])):` to stage a component metric for its LLM span: ```python title="anthropic_app.py" showLineNumbers import asyncio from deepeval.anthropic import AsyncAnthropic from deepeval.tracing import trace, LlmSpanContext from deepeval.metrics import AnswerRelevancyMetric ... client = AsyncAnthropic() async def call_claude(prompt: str): with trace(llm_span_context=LlmSpanContext(metrics=[AnswerRelevancyMetric()])): return await client.messages.create( model="claude-sonnet-4-5", max_tokens=1024, messages=[{"role": "user", "content": prompt}], ) for golden in dataset.evals_iterator(): task = asyncio.create_task(call_claude(golden.input)) dataset.evaluate(task) ``` ```python title="anthropic_app.py" showLineNumbers from deepeval.anthropic import Anthropic from deepeval.tracing import trace, LlmSpanContext from deepeval.evaluate import AsyncConfig from deepeval.metrics import AnswerRelevancyMetric ... client = Anthropic() for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with trace(llm_span_context=LlmSpanContext(metrics=[AnswerRelevancyMetric()])): client.messages.create( model="claude-sonnet-4-5", max_tokens=1024, messages=[{"role": "user", "content": golden.input}], ) ``` See the [Anthropic integration](/integrations/frameworks/anthropic) for streaming and tool-use. Register `deepeval`'s event handler against LlamaIndex's instrumentation dispatcher. Stage a component metric for the agent span with `AgentSpanContext` (or the next LLM span with `LlmSpanContext`) inside `with trace(...)`. `agent.run(...)` is async-only, so the sync variant uses `asyncio.run(...)`: ```python title="llamaindex_agent.py" showLineNumbers import asyncio from llama_index.llms.openai import OpenAI from llama_index.core.agent import FunctionAgent import llama_index.core.instrumentation as instrument from deepeval.tracing import trace, AgentSpanContext from deepeval.integrations.llama_index import instrument_llama_index from deepeval.metrics import TaskCompletionMetric ... instrument_llama_index(instrument.get_dispatcher()) def multiply(a: float, b: float) -> float: return a * b agent = FunctionAgent( tools=[multiply], llm=OpenAI(model="gpt-4o-mini"), system_prompt="You are a helpful calculator.", ) async def run_agent(prompt: str): with trace(agent_span_context=AgentSpanContext(metrics=[TaskCompletionMetric()])): return await agent.run(prompt) for golden in dataset.evals_iterator(): task = asyncio.create_task(run_agent(golden.input)) dataset.evaluate(task) ``` ```python title="llamaindex_agent.py" showLineNumbers import asyncio from llama_index.llms.openai import OpenAI from llama_index.core.agent import FunctionAgent import llama_index.core.instrumentation as instrument from deepeval.tracing import trace, AgentSpanContext from deepeval.evaluate import AsyncConfig from deepeval.integrations.llama_index import instrument_llama_index from deepeval.metrics import TaskCompletionMetric ... instrument_llama_index(instrument.get_dispatcher()) def multiply(a: float, b: float) -> float: return a * b agent = FunctionAgent( tools=[multiply], llm=OpenAI(model="gpt-4o-mini"), system_prompt="You are a helpful calculator.", ) async def run_agent(prompt: str): with trace(agent_span_context=AgentSpanContext(metrics=[TaskCompletionMetric()])): return await agent.run(prompt) for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): asyncio.run(run_agent(golden.input)) ``` See the [LlamaIndex integration](/integrations/frameworks/llamaindex) for the full surface. Register `DeepEvalTracingProcessor` once, then build your agent with `deepeval`'s `Agent` and `function_tool` shims. Attach component metrics directly on the `Agent` (`agent_metrics` for the agent span, `llm_metrics` for the LLM span) and on `@function_tool` (for the tool span): ```python title="openai_agents_app.py" showLineNumbers import asyncio from agents import Runner, add_trace_processor from deepeval.openai_agents import Agent, DeepEvalTracingProcessor, function_tool from deepeval.metrics import TaskCompletionMetric, AnswerRelevancyMetric, GEval from deepeval.test_case import LLMTestCaseParams ... add_trace_processor(DeepEvalTracingProcessor()) @function_tool(metrics=[GEval( name="Helpful Weather Lookup", criteria="Output must be a clear weather summary for the requested city.", evaluation_params=[LLMTestCaseParams.INPUT, LLMTestCaseParams.ACTUAL_OUTPUT], )]) def get_weather(city: str) -> str: return f"It's always sunny in {city}!" agent = Agent( name="weather_agent", instructions="Answer weather questions concisely.", tools=[get_weather], agent_metrics=[TaskCompletionMetric()], llm_metrics=[AnswerRelevancyMetric()], ) for golden in dataset.evals_iterator(): task = asyncio.create_task(Runner.run(agent, golden.input)) dataset.evaluate(task) ``` ```python title="openai_agents_app.py" showLineNumbers from agents import Runner, add_trace_processor from deepeval.evaluate import AsyncConfig from deepeval.openai_agents import Agent, DeepEvalTracingProcessor, function_tool from deepeval.metrics import TaskCompletionMetric, AnswerRelevancyMetric, GEval from deepeval.test_case import LLMTestCaseParams ... add_trace_processor(DeepEvalTracingProcessor()) @function_tool(metrics=[GEval( name="Helpful Weather Lookup", criteria="Output must be a clear weather summary for the requested city.", evaluation_params=[LLMTestCaseParams.INPUT, LLMTestCaseParams.ACTUAL_OUTPUT], )]) def get_weather(city: str) -> str: return f"It's always sunny in {city}!" agent = Agent( name="weather_agent", instructions="Answer weather questions concisely.", tools=[get_weather], agent_metrics=[TaskCompletionMetric()], llm_metrics=[AnswerRelevancyMetric()], ) for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): Runner.run_sync(agent, golden.input) ``` `agent_metrics` apply on every run (including handoffs to sub-agents). See the [OpenAI Agents integration](/integrations/frameworks/openai-agents) for the full surface. Call `instrument_google_adk()` once before building your `LlmAgent`. Stage a component metric for the next Google-ADK-emitted span with `next_agent_span(...)` or `next_llm_span(...)`. ADK's `runner.run_async(...)` is async-only, so the sync variant uses `asyncio.run(...)`: ```python title="google_adk_agent.py" showLineNumbers import asyncio from google.adk.agents import LlmAgent from google.adk.runners import InMemoryRunner from google.genai import types from deepeval.tracing import next_agent_span from deepeval.integrations.google_adk import instrument_google_adk from deepeval.metrics import TaskCompletionMetric ... instrument_google_adk() agent = LlmAgent(model="gemini-2.0-flash", name="assistant", instruction="Be concise.") runner = InMemoryRunner(agent=agent, app_name="deepeval-quickstart") async def run_agent(prompt: str) -> str: session = await runner.session_service.create_session( app_name="deepeval-quickstart", user_id="demo-user", ) message = types.Content(role="user", parts=[types.Part(text=prompt)]) async for event in runner.run_async( user_id="demo-user", session_id=session.id, new_message=message, ): if event.is_final_response() and event.content: return "".join(part.text for part in event.content.parts if getattr(part, "text", None)) return "" async def run_with_metric(prompt: str) -> str: with next_agent_span(metrics=[TaskCompletionMetric()]): return await run_agent(prompt) for golden in dataset.evals_iterator(): task = asyncio.create_task(run_with_metric(golden.input)) dataset.evaluate(task) ``` ```python title="google_adk_agent.py" showLineNumbers import asyncio from google.adk.agents import LlmAgent from google.adk.runners import InMemoryRunner from google.genai import types from deepeval.tracing import next_agent_span from deepeval.evaluate import AsyncConfig from deepeval.integrations.google_adk import instrument_google_adk from deepeval.metrics import TaskCompletionMetric ... instrument_google_adk() agent = LlmAgent(model="gemini-2.0-flash", name="assistant", instruction="Be concise.") runner = InMemoryRunner(agent=agent, app_name="deepeval-quickstart") async def run_agent(prompt: str) -> str: session = await runner.session_service.create_session( app_name="deepeval-quickstart", user_id="demo-user", ) message = types.Content(role="user", parts=[types.Part(text=prompt)]) async for event in runner.run_async( user_id="demo-user", session_id=session.id, new_message=message, ): if event.is_final_response() and event.content: return "".join(part.text for part in event.content.parts if getattr(part, "text", None)) return "" for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): with next_agent_span(metrics=[TaskCompletionMetric()]): asyncio.run(run_agent(golden.input)) ``` See the [Google ADK integration](/integrations/frameworks/google-adk) for the full surface. Call `instrument_crewai()` once, then build your crew with `deepeval`'s `Crew`, `Agent`, `LLM`, and `@tool` shims. Attach component metrics directly on `Agent` (agent span), `LLM` (LLM span), or `@tool` (tool span): ```python title="crewai_app.py" showLineNumbers import asyncio from crewai import Task from deepeval.integrations.crewai import instrument_crewai, Crew, Agent from deepeval.metrics import TaskCompletionMetric ... instrument_crewai() tutor = Agent( role="Math Tutor", goal="Answer math questions accurately and concisely.", backstory="An experienced tutor who explains simple math clearly.", metrics=[TaskCompletionMetric()], ) answer_task = Task( description="{question}", expected_output="An accurate, concise answer.", agent=tutor, ) crew = Crew(agents=[tutor], tasks=[answer_task]) for golden in dataset.evals_iterator(): task = asyncio.create_task(crew.kickoff_async({"question": golden.input})) dataset.evaluate(task) ``` ```python title="crewai_app.py" showLineNumbers from crewai import Task from deepeval.evaluate import AsyncConfig from deepeval.integrations.crewai import instrument_crewai, Crew, Agent from deepeval.metrics import TaskCompletionMetric ... instrument_crewai() tutor = Agent( role="Math Tutor", goal="Answer math questions accurately and concisely.", backstory="An experienced tutor who explains simple math clearly.", metrics=[TaskCompletionMetric()], ) task = Task( description="{question}", expected_output="An accurate, concise answer.", agent=tutor, ) crew = Crew(agents=[tutor], tasks=[task]) for golden in dataset.evals_iterator(async_config=AsyncConfig(run_async=False)): crew.kickoff({"question": golden.input}) ``` See the [CrewAI integration](/integrations/frameworks/crewai) for the full surface (including `LLM` and `@tool` metric attachment).