Use with agent frameworks

You can integrate the OpenSearch MCP server directly into Python agent frameworks, giving your autonomous agents programmatic access to OpenSearch as part of a larger workflow.

Strands Agents

Strands Agents is an AWS-native agent SDK with built-in MCP support and Amazon Bedrock as the default model provider. The following example connects a Strands agent to either an OpenSearch Service domain or an OpenSearch Serverless collection by setting the appropriate environment variables. Set AWS_OPENSEARCH_SERVERLESS to true when connecting to an OpenSearch Serverless collection; omit it for a managed domain.

import os
from strands import Agent
from strands.tools.mcp import MCPClient
from mcp import stdio_client, StdioServerParameters

# For a managed domain:
#   OPENSEARCH_URL = https://<domain-endpoint>.<region>.es.amazonaws.com
#
# For an OpenSearch Serverless collection, also set:
#   AWS_OPENSEARCH_SERVERLESS = true
#   OPENSEARCH_URL = https://<collection-id>.<region>.aoss.amazonaws.com
opensearch_client = MCPClient(
    lambda: stdio_client(
        StdioServerParameters(
            command="uvx",
            args=["opensearch-mcp-server-py"],
            env={
                "OPENSEARCH_URL":            os.environ["OPENSEARCH_URL"],
                "AWS_REGION":                os.environ["AWS_REGION"],
                "AWS_IAM_ARN":               os.environ["AWS_IAM_ARN"],
                # Set to "true" for OpenSearch Serverless, omit for managed domains
                "AWS_OPENSEARCH_SERVERLESS": os.environ.get("AWS_OPENSEARCH_SERVERLESS", "false"),
            },
        )
    )
)

with opensearch_client:
    agent = Agent(tools=opensearch_client.list_tools_sync())
    response = agent("List all indexes and show the document count for each")
    print(response)

Strands uses Amazon Bedrock as its default model provider. Make sure you have AWS credentials configured and model access enabled for Claude in your region. For details, see the Strands Bedrock provider documentation.

LangGraph

LangGraph is a low-level orchestration framework for building stateful agents. The following example uses langchain-mcp-adapters to load the OpenSearch MCP tools into a LangGraph ReAct agent backed by Amazon Bedrock. As with Strands, set AWS_OPENSEARCH_SERVERLESS to true when connecting to an OpenSearch Serverless collection.

import asyncio
import os
from langchain_aws import ChatBedrock
from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent

async def main():
    async with MultiServerMCPClient(
        {
            "opensearch": {
                "command": "uvx",
                "args": ["opensearch-mcp-server-py"],
                "env": {
                    # Managed domain:  https://<domain-endpoint>.<region>.es.amazonaws.com
                    # Serverless:      https://<collection-id>.<region>.aoss.amazonaws.com
                    "OPENSEARCH_URL":            os.environ["OPENSEARCH_URL"],
                    "AWS_REGION":                os.environ["AWS_REGION"],
                    "AWS_IAM_ARN":               os.environ["AWS_IAM_ARN"],
                    # Set to "true" for OpenSearch Serverless, omit for managed domains
                    "AWS_OPENSEARCH_SERVERLESS": os.environ.get("AWS_OPENSEARCH_SERVERLESS", "false"),
                },
                "transport": "stdio",
            }
        }
    ) as mcp_client:
        tools = mcp_client.get_tools()
        model = ChatBedrock(
            model_id="anthropic.claude-3-5-sonnet-20241022-v2:0",
            region_name=os.environ["AWS_REGION"],
        )
        agent = create_react_agent(model, tools)
        result = await agent.ainvoke(
            {"messages": [{"role": "user", "content": "Check cluster health and list all indexes"}]}
        )
        print(result["messages"][-1].content)

asyncio.run(main())

Install the required packages:

pip install langchain-aws langchain-mcp-adapters langgraph