Langchain Agents

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Getting Started

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1. Install the required packages:

pip install -qU langchain langchain-openai portkey-ai

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2. Configure your Langchain LLM objects:

from langchain_openai import ChatOpenAI, createHeaders
from portkey_ai import createHeaders, PORTKEY_GATEWAY_URL

llm1 = ChatOpenAI(
    api_key="OpenAI_API_Key",
     base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
    provider="openai",
    api_key="PORTKEY_API_KEY"
    )
)

That’s all you need to do to use Portkey with Llama Index agents. Execute your agents and visit Portkey.ai to observe your Agent’s activity.

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Integration Guide

Here’s a simple Google Colab notebook that demonstrates Llama Index with Portkey integration

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Make your agents Production-ready with Portkey

Portkey makes your Llama Index agents reliable, robust, and production-grade with its observability suite and AI Gateway. Seamlessly integrate 200+ LLMs with your Llama Index agents using Portkey. Implement fallbacks, gain granular insights into agent performance and costs, and continuously optimize your AI operations—all with just 2 lines of code.

Let’s dive deep! Let’s go through each of the use cases!

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1. Interoperability

Easily switch between 200+ LLMs. Call various LLMs such as Anthropic, Gemini, Mistral, Azure OpenAI, Google Vertex AI, AWS Bedrock, and many more by simply changing the provider and API key in the ChatOpenAI object.

• OpenAI to Azure OpenAI
• Anthropic to AWS Bedrock

llm = ChatOpenAI(
    api_key="OpenAI_API_Key",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        provider="openai", #choose your provider
        api_key="PORTKEY_API_KEY"
    )
)

llm = ChatOpenAI(
    api_key="api-key",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        provider="azure-openai", #choose your provider
        api_key="PORTKEY_API_KEY",
        virtual_key="AZURE_VIRTUAL_KEY"   # Replace with your virtual key for Azure
    )
)

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2. Reliability

Agents are brittle. Long agentic pipelines with multiple steps can fail at any stage, disrupting the entire process. Portkey solves this by offering built-in fallbacks between different LLMs or providers, load-balancing across multiple instances or API keys, and implementing automatic retries and request timeouts. This makes your agents more reliable and resilient.

Here’s how you can implement these features using Portkey’s config

{
  "retry": {
    "attempts": 5
  },
  "strategy": {
    "mode": "loadbalance" // Choose between "loadbalance" or "fallback"
  },
  "targets": [
    {
      "provider": "openai",
      "api_key": "OpenAI_API_Key"
    },
    {
      "provider": "anthropic",
      "api_key": "Anthropic_API_Key"
    }
  ]
}

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3. Metrics

Agent runs can be costly. Tracking agent metrics is crucial for understanding the performance and reliability of your AI agents. Metrics help identify issues, optimize runs, and ensure that your agents meet their intended goals.

Portkey automatically logs comprehensive metrics for your AI agents, including cost, tokens used, latency, etc. Whether you need a broad overview or granular insights into your agent runs, Portkey’s customizable filters provide the metrics you need. For agent-specific observability, add Trace-id to the request headers for each agent.

llm2 = ChatOpenAI(
    api_key="Anthropic_API_Key",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        api_key="PORTKEY_API_KEY",
        provider="anthropic",
        trace_id="research_agent1" #Add individual trace-id for your agent analytics
    )
)

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4. Logs

Agent runs are complex. Logs are essential for diagnosing issues, understanding agent behavior, and improving performance. They provide a detailed record of agent activities and tool use, which is crucial for debugging and optimizing processes.

Portkey offers comprehensive logging features that capture detailed information about every action and decision made by your AI agents. Access a dedicated section to view records of agent executions, including parameters, outcomes, function calls, and errors. Filter logs based on multiple parameters such as trace ID, model, tokens used, and metadata.

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5. Traces

With traces, you can see each agent run granularly on Portkey. Tracing your Langchain agent runs helps in debugging, performance optimzation, and visualizing how exactly your agents are running.

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Using Traces in Langchain Agents

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Step 1: Import & Initialize the Portkey Langchain Callback Handler

from portkey_ai.langchain import LangchainCallbackHandler

portkey_handler = LangchainCallbackHandler(
    api_key="YOUR_PORTKEY_API_KEY",
    metadata={
        "session_id": "session_1",  # Use consistent metadata across your application
        "agent_id": "research_agent_1",  # Specific to the current agent
    }
)

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Step 2: Configure Your LLM with the Portkey Callback

from langchain.chat_models import ChatOpenAI

llm = ChatOpenAI(
    api_key="YOUR_OPENAI_API_KEY_HERE",
    callbacks=[portkey_handler],
    # ... other parameters
)

With Portkey tracing, you can encapsulate the complete execution of your agent workflow.

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6. Guardrails

LLMs are brittle - not just in API uptimes or their inexplicable 400/500 errors, but also in their core behavior. You can get a response with a 200 status code that completely errors out for your app’s pipeline due to mismatched output. With Portkey’s Guardrails, we now help you enforce LLM behavior in real-time with our Guardrails on the Gateway pattern.

Using Portkey’s Guardrail platform, you can now verify your LLM inputs AND outputs to be adhering to your specifed checks; and since Guardrails are built on top of our Gateway, you can orchestrate your request exactly the way you want - with actions ranging from denying the request, logging the guardrail result, creating an evals dataset, falling back to another LLM or prompt, retrying the request, and more.

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7. Continuous Improvement

Improve your Agent runs by capturing qualitative & quantitative user feedback on your requests. Portkey’s Feedback APIs provide a simple way to get weighted feedback from customers on any request you served, at any stage in your app. You can capture this feedback on a request or conversation level and analyze it by adding meta data to the relevant request.

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8. Caching

Agent runs are time-consuming and expensive due to their complex pipelines. Caching can significantly reduce these costs by storing frequently used data and responses. Portkey offers a built-in caching system that stores past responses, reducing the need for agent calls saving both time and money.

{
 "cache": {
    "mode": "semantic" // Choose between "simple" or "semantic"
 }
}

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9. Security & Compliance

Set budget limits on provider API keys and implement fine-grained user roles and permissions for both the app and the Portkey APIs.

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Portkey Config

Many of these features are driven by Portkey’s Config architecture. The Portkey app simplifies creating, managing, and versioning your Configs.

For more information on using these features and setting up your Config, please refer to the Portkey documentation.