CrewAI is a popular framework for building AI agents and multi-agent workflows. This article provides a hands-on, step-by-step walkthrough that uses CrewAI open source, along with the Unstructured Workflow Endpoint MCP Server and Python, to build a multi-agent workflow. This multi-agent workflow uses the MCP server to call various functions within the Unstructured Workflow Endpoint to build Unstructured ETL+ workflows from connector creation all the way through to workflow job completion. This walkthrough uses an Amazon S3 bucket as both the workflow’s source and destination. However, you can modify this multi-agent workflow later to use a different S3 bucket or even different sources and destinations, to have a collection of AI agents quickly build multiple Unstructured ETL+ workflows on your behalf with varying configurations.

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Requirements

To complete this walkthrough, you must first have:
  • An Unstructured account and an Unstructured API key for that account.
  • An Anthropic account and an Anthropic API key for that account.
  • A properly configured Amazon S3 bucket with bucket access credentials.
  • A Firecrawl account and a Firecrawl API key for that account.
  • Python and the CrewAI open-source toolchain installed on your local development machine.
The following sections describe how to get these requirements.

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Unstructured account and API key

Before you begin, you must have an Unstructured account and an Unstructured API key, as follows:
  1. If you do not already have an Unstructured account, sign up for free. After you sign up, you are automatically signed in to your new Unstructured Starter account, at https://platform.unstructured.io.
    To sign up for a Team or Enterprise account instead, contact Unstructured Sales, or learn more.
  2. If you have an Unstructured Starter or Team account and are not already signed in, sign in to your account at https://platform.unstructured.io.
    For an Enterprise account, see your Unstructured account administrator for instructions, or email Unstructured Support at support@unstructured.io.
  3. Get your Unstructured API key:
     a. After you sign in to your Unstructured Starter account, click API Keys on the sidebar.
    For a Team or Enterprise account, before you click API Keys, make sure you have selected the organizational workspace you want to create an API key for. Each API key works with one and only one organizational workspace. Learn more.
    b. Click Generate API Key.
    c. Follow the on-screen instructions to finish generating the key.
    d. Click the Copy icon next to your new key to add the key to your system’s clipboard. If you lose this key, simply return and click the Copy icon again.

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Anthropic account and API key

This walkthrough uses a Claude Opus 3 model from Anthropic. So, before you begin, you must also have an Anthropic account and an Anthropic API key for that account. Sign in to or create your Anthropic account. After you sign in to your Anthropic account, get your Anthropic API key.

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Amazon S3 bucket and access credentials

This walkthrough uses an Amazon S3 bucket as both the workflow’s source and destination. So, before you begin, you must also have a properly configured Amazon S3 bucket, with bucket access credentials consisting of an access key ID and a secret access key for the AWS IAM user that has access to the bucket. Follow the S3 connector instructions to create and configure the bucket and get the bucket access credentials if you do not already have this all set up. (In these instructions, do not follow the directions to use the Unstructured UI to create the S3 source connector. CrewAI will do this for you later automatically.) This walkthrough expects two folders to exist within the bucket, as follows:
  • An input folder, which contains the files to process. This input folder must contain at least one file to process. If you do not have any files available to upload into the input folder, you can get some from the example-docs folder in the Unstructured open source library repository on GitHub.
  • An output folder, which will contain the processed files’ data from Unstructured after CrewAI runs the workflow. This output folder should be empty for now.

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Firecrawl account and API key

This walkthrough uses Firecrawl to monitor job statuses. So, before you begin, you must also have a Firecrawl account and a Firecrawl API key for that account. Sign in to or create your Firecrawl account. After you sign in to your Firecrawl account, get your Firecrawl API key.

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Python and CrewAI open-source toolchain and project setup

Before you can start coding on your local machine, you must install Python, and you should also install a Python package and project manager to manage your project’s code dependencies. This walkthrough uses the popular Python pacakge and project manager uv (although uv is not required to use CrewAI or the Unstructured Workflow Endpoint MCP Server).
1

Install uv

To install uv, run one of the following commands, depending on your operating system:
To use curl with sh:
curl -fsSL https://get.uv.dev | bash
To use wget with sh instead:
wget -qO- https://astral.sh/uv/install.sh | sh
If you need to install uv by using other approaches such as PyPI, Homebrew, or WinGet, see Installing uv.
2

Install CrewAI open source

Use uv to install the CrewAI open-source toolchain, by running the following command:
uv tool install crewai
3

Install Python

CrewAI open source works only with Python 3.10, 3.11, and 3.12.
uv will detect and use Python if you already have it installed. To view a list of installed Python versions, run the following command:
uv python list
If, however, you do not already have Python installed, you can install a version of Python for use with uv by running the following command. For example, this command installs Python 3.12 for use with uv:
uv python install 3.12

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Build and run the CrewAIproject

You are now ready to start coding.
1

Create the project directory

Switch to the directory on your local development machine where you want to create the project directory for this walkthrough. This example creates a project directory named crewai_unstructured_demo within your current working directory and then switches to this new project directory:
mkdir crewai_unstructured_demo
cd crewai_unstructured_demo
2

Intiialize the project

From within the new project directory, use uv to initialize the project by running the following command:
uv init
3

Create a venv virtual environment

To isolate and manage your project’s code dependencies, you should create a virtual environment. This walkthrough uses the popular Python virtual environment manager venv (although venv is not required to use CrewAI or the Unstructured Workflow Endpoint MCP Server). From the root of your project directory, use uv to create a virtual environment with venv by running the following command:
# Create the virtual environment by using the current Python version:
uv venv

# Or, if you want to use a specific Python version:
uv venv --python 3.12
4

Activate the virtual environment

To activate the venv virtual environment, run one of the following commands from the root of your project directory:
  • For bash or zsh, run source .venv/bin/activate
  • For fish, run source .venv/bin/activate.fish
  • For csh or tcsh, run source .venv/bin/activate.csh
  • For pwsh, run .venv/bin/Activate.ps1
If you need to deactivate the virtual environment at any time, run the following command:
deactivate
5

Get the Unstructured Workflow Endpoint MCP Server's source code

The Unstructured Workflow Endpoint MCP Server is a Python package that provides an MCP server for the Unstructured Workflow Endpoint. To get the MCP server’s source code, run the following command from the root of your project directory:
git clone https://github.com/Unstructured-IO/UNS-MCP.git
6

Install the Unstructured Workflow Endpoint MCP Server's code dependencies

From the root of your project directory, switch to the cloned Unstructured Workflow Endpoint MCP Server’s source directory, and then use uv to install the MCP server’s code dependencies, by running the following commands:
cd UNS-MCP
uv sync
7

Install the CrewAI project's code dependencies

Switch back to the CrewAI project’s root directory, and then use uv to install the CrewAI project’s dependencies, by running the following commands:
cd ..
uv add "crewai>=0.11.0" "crewai-tools[mcp]>=0.0.5" "pydantic>=2.11.0" python-dotenv
8

Add the CrewAI project's source code

In the main.py file in the CrewAI project’s root directory, replace that file’s contents with the following Python code. This code defines a set of CrewAI-compatible agents and tasks that make up a multi-agent crew. This code then uses the crew’s agents to run the tasks in order to build an Unstructured ETL+ workflows from connector creation all the way through to workflow job completion:
import os
from typing import Optional
from crewai import LLM, Agent, Crew, Task
from crewai_tools import MCPServerAdapter
from dotenv import load_dotenv
from pydantic import BaseModel, Field
from rich.pretty import pprint

load_dotenv()

class SourceConfigurationResult(BaseModel):
    source_id: Optional[str] = Field(
        default=None,
        description="The ID of the configured data source.",
    )
    source_type: Optional[str] = Field(
        default=None,
        description="The type of data source configured.",
    )
    source_name: Optional[str] = Field(
        default=None,
        description="The name of the configured data source.",
    )
    source_config: Optional[dict] = Field(
        default=None,
        description="The configuration details of the data source.",
    )

class DestinationConfigurationResult(BaseModel):
    destination_id: Optional[str] = Field(
        default=None,
        description="The ID of the configured data destination.",
    )
    destination_type: Optional[str] = Field(
        default=None,
        description="The type of data destination configured.",
    )
    destination_name: Optional[str] = Field(
        default=None,
        description="The name of the configured data destination.",
    )
    destination_config: Optional[dict] = Field(
        default=None,
        description="The configuration details of the data destination.",
    )

class WorkflowConfigurationResult(BaseModel):
    workflow_id: Optional[str] = Field(
        default=None,
        description="The ID of the created workflow.",
    )
    workflow_name: Optional[str] = Field(
        default=None,   
        description="The name of the created workflow.",
    )
    workflow_type: Optional[str] = Field(
        default=None,
        description="The type of workflow created.",
    )
    workflow_config: Optional[dict] = Field(
        default=None,
        description="The configuration details of the workflow.",
    )

class JobConfigurationResult(BaseModel):
    job_id: Optional[str] = Field(
        default=None,
        description="The ID of the created job.",
    )

class JobStatusResult(BaseModel):
    job_status: Optional[str] = Field(
        default=None,
        description="The status of the job.",
    )

def main():

    with MCPServerAdapter(
        {"url": os.getenv("MCP_SERVER_URL", "http://127.0.0.1:8080/sse")},
    ) as tools:
        llm = LLM(model="anthropic/claude-3-opus-20240229", temperature=0.7, max_tokens=4096)

        source_agent = Agent(
            role="Source Configuration Specialist",
            goal="Configure and manage data sources for the MCP server",
            backstory="""You are an expert in data source configuration and management.
            You specialize in setting up and configuring various types of data sources
            including AWS S3, Google Drive, and other storage systems. You ensure
            proper configuration and validation of data sources.""",
            tools=tools,
            llm=llm,
            verbose=True,
        )

        destination_agent = Agent(
            role="Destination Configuration Specialist",
            goal="Configure and manage data destinations for the MCP server",
            backstory="""You are an expert in data destination configuration and management.
            You specialize in setting up and configuring various types of data destinations
            including AWS S3, Google Drive, and other storage systems. You ensure
            proper configuration and validation of data destinations.""",
            tools=tools,
            llm=llm,
            verbose=True,
        )

        workflow_agent = Agent(
            role="Workflow Configuration Specialist",
            goal="Configure and manage workflows for the MCP server",
            backstory="""You are an expert in workflow configuration and management.
            You specialize in setting up and configuring various types of workflows
            including AWS S3, Google Drive, and other storage systems. You ensure
            proper configuration and validation of workflows.""",
            tools=tools,
            llm=llm,
            verbose=True,
        )

        run_workflow_agent = Agent(
            role="Workflow Run Specialist",
            goal="Run workflows for the MCP server",
            backstory="""You are an expert in workflow run management.
            You specialize in running various types of workflows
            including AWS S3, Google Drive, and other storage systems. You ensure
            proper running of workflows.""",
            tools=tools,
            llm=llm,
            verbose=True,
        )

        job_agent = Agent(
            role="Job Management Specialist",
            goal="Manage jobs for the MCP server",
            backstory="""You are an expert in job management.
            You specialize in monitoring  various types of jobs
            proper monitoring of jobs.""",
            tools=tools,
            llm=llm,
            verbose=True,
        )

        source_task = Task(
            description=f"""Configure an S3 source with the following specifications:
            - Name: {os.getenv("S3_SOURCE_CONNECTOR_NAME")}
            - URI: {os.getenv("S3_SOURCE_URI")}
            - Recursive: true
            Ensure the source is properly configured and return the configuration details.""",
            agent=source_agent,
            expected_output="""A result containing:
            - source_id: The ID of the configured source
            - source_config: The configuration details
            - source_name: The name of the configured source
            - source_type: The type of data source configured
            """,
            output_pydantic=SourceConfigurationResult,
        )

        destination_task = Task(
            description=f"""Configure an S3 destination with the following specifications:
            - Name: {os.getenv("S3_DESTINATION_CONNECTOR_NAME")}
            - URI: {os.getenv("S3_DESTINATION_URI")}
            Ensure the destination is properly configured and return the configuration details.""",
            agent=destination_agent,
            expected_output="""A result containing:
            - destination_id: The ID of the configured destination
            - destination_config: The configuration details
            - destination_name: The name of the configured destination
            - destination_type: The type of data destination configured
            """,
            output_pydantic=DestinationConfigurationResult,
        )

        workflow_task = Task(
            description=f"""Create a workflow that uses the High Res partitioner and the following specifications:
            - Name: {os.getenv("WORKFLOW_NAME")}
            - Type: custom
            Use the source and destination IDs from the previous tasks to create the workflow.
            Ensure the workflow is properly configured to connect these endpoints.""",
            agent=workflow_agent,
            expected_output="""A result containing:
            - workflow_id: The ID of the created workflow
            - workflow_config: The configuration details
            - workflow_name: The name of the created workflow
            - workflow_type: The type of workflow created
            """,
            output_pydantic=WorkflowConfigurationResult,
            context=[source_task, destination_task],
        )

        run_workflow_task = Task(
            description=f"""Run a workflow.
            Use the workflow ID from the previous task to run the workflow.""",
            agent=run_workflow_agent,
            expected_output="""A result containing:
            - job_id: The ID of the running workflow
            """,
            output_pydantic=JobConfigurationResult,
            context=[workflow_task],
        )

        job_task = Task(
            description=f"""Monitor a job.
            Use the job ID from the previous task.
            Keep monitoring the job every 15 seconds until it is completed.
            Each time you check, report the current job status.
            When the job status is completed, stop reporting and return the final job status.""",
            agent=job_agent,
            expected_output="""A result containing:
            - job_status: The status of the job
            """,
            output_pydantic=JobStatusResult,
            context=[run_workflow_task],
        ) 

        crew = Crew(agents=[
                               source_agent,
                               destination_agent,
                               workflow_agent,
                               run_workflow_agent,
                               job_agent
                            ], 
                    tasks=[
                               source_task, 
                               destination_task, 
                               workflow_task, 
                               run_workflow_task,
                               job_task
                          ], 
                    verbose=True
            )

        result = crew.kickoff()
        pprint("Source Task Result:")
        pprint(result.tasks_output[0].pydantic)
        pprint("Destination Task Result:")
        pprint(result.tasks_output[1].pydantic)
        pprint("Workflow Task Result:")
        pprint(result.tasks_output[2].pydantic)
        pprint("Run Workflow Task Result:")
        pprint(result.tasks_output[3].pydantic)
        pprint("Job Task Result:")
        pprint(result.tasks_output[4].pydantic)

if __name__ == "__main__":
    main()
The preceding code does the following:
  1. Imports the necessary library modules for the rest of the code to use.
  2. Loads the environment variables that the code relies on from a .env file, which you will create in the next step.
  3. Defines the Pydantic-formatted models for the expected output of each task. These models format the tasks’ output for consistent presentation.
  4. Defines the agents and tasks for the crew. These agents use their related tasks to create a source connector, a destination connector, and a workflow that uses these connectors, and then runs the newly created workflow as a job and reports the job’s status.
  5. After the crew is finished, the results of each task are printed.
9

Create the .env file

Create an .env file in the root of your CrewAI project directory, and then add the following environment variables to the file:
  • UNSTRUCTURED_API_KEY - Your Unstructured API key.
  • ANTHROPIC_API_KEY - Your Anthropic API key.
  • FIRECRAWL_API_KEY - Your Firecrawl API key.
  • AWS_KEY - The AWS access key ID for the AWS IAM user that has access to the S3 bucket.
  • AWS_SECRET - The IAM user’s AWS secret access key.
  • S3_SOURCE_CONNECTOR_NAME - Some display name for the S3 source connector.
  • S3_SOURCE_URI - The URI of the input folder in the S3 bucket.
  • S3_DESTINATION_CONNECTOR_NAME - The name of the S3 destination connector.
  • S3_DESTINATION_URI - The URI of the output folder in the S3 bucket.
  • WORKFLOW_NAME - Some display name for the workflow.
For example, your .env file might look like this:
- UNSTRUCTURED_API_KEY=7F1...<redacted>hZV4
- ANTHROPIC_API_KEY=sk-ant-api03-09b...<redacted>...wAA
- FIRECRAWL_API_KEY=fc-af337...<redacted>...329
- AWS_KEY=AKI...<redacted>...3DX
- AWS_SECRET=end...<redacted>...Xxb
- S3_SOURCE_CONNECTOR_NAME=My-MCP-S3-Source
- S3_SOURCE_URI=s3://my-bucket/input
- S3_DESTINATION_CONNECTOR_NAME=My-MCP-S3-Destination
- S3_DESTINATION_URI=s3://my-bucket/output
- WORKFLOW_NAME=My-MCP-S3-To-S3-Workflow
10

Unstructured Workflow Endpoint MCP Server

From the root of your project directory, switch to the Unstructured Workflow Endpoint MCP Server’s source directory, and then use make to run the MCP server locally, by running the following commands:
cd UNS-MCP
make sse-server
If you do not have make available, see your operating system’s documentation for installation instructions.
The MCP server will start running at http://127.0.0.1:8080/sse.You must leave the MCP server running in your terminal or command prompt window while you run the CrewAI project.
11

Run the CrewAI project

  1. In a separate terminal or command prompt window, from the root of your project directory, run the CrewAI project by running the following command: 
    uv run main.py
  2. The CrewAI project will run and create an Unstructured ETL+ workflow. You can see the crew’s progress in the terminal or command prompt window where you ran the uv run main.py command.
  3. The crew’s agents will create a source connector, a destination connector, and a workflow that uses these connectors.
  4. The crew’s agents will then run the workflow as a job and report on the job’s status.
  5. After the job is completed, the crew will report final information about the tasks that were completed, for example: 
    'Source Task Result:'
SourceConfigurationResult(
│   source_id='c26...<redacted>...83b',
│   source_type='s3',
│   source_name='My-MCP-S3-Source',
│   source_config={
│   │   'anonymous': False,
│   │   'recursive': True,
│   │   'remote_url': 's3://my-bucket/input',
│   │   'endpoint_url': None,
│   │   'key': '**********',
│   │   'secret': '**********',
│   │   'token': None
│   }
)
'Destination Task Result:'
DestinationConfigurationResult(
│   destination_id='d57...<redacted>...ea4',
│   destination_type='s3',
│   destination_name='My-MCP-S3-Destination',
│   destination_config={
│   │   'anonymous': False,
│   │   'remote_url': 's3://my-bucket/output',
│   │   'endpoint_url': None,
│   │   'key': '**********',
│   │   'secret': '**********',
│   │   'token': None
│   }
)
'Workflow Task Result:'
WorkflowConfigurationResult(
│   workflow_id='ae5...<redacted>...cae',
│   workflow_name='My-MCP-S3-To-S3-Workflow',
│   workflow_type='custom',
│   workflow_config={
│   │   'name': 'My-MCP-S3-To-S3-Workflow',
│   │   'workflow_type': 'custom',
│   │   'source_id': 'c26...<redacted>...83b',
│   │   'destination_id': 'd57...<redacted>...ea4',
│   │   'workflow_nodes': [
│   │   │   {
│   │   │   │   'name': 'Partitioner',
│   │   │   │   'type': 'partition',
│   │   │   │   'subtype': 'unstructured_api',
│   │   │   │   'settings': {
│   │   │   │   │   'strategy': 'hi_res',
│   │   │   │   │   'include_page_breaks': False,
│   │   │   │   │   'pdf_infer_table_structure': False,
│   │   │   │   │   'exclude_elements': None,
│   │   │   │   │   'xml_keep_tags': False,
│   │   │   │   │   'encoding': 'utf-8',
│   │   │   │   │   'ocr_languages': ['eng'],
│   │   │   │   │   'extract_image_block_types': ['image', 'table']
│   │   │   │   }
│   │   │   }
│   │   ]
│   }
)
'Run Workflow Task Result:'
JobConfigurationResult(job_id='c3a5...<redacted>...bfa')
'Job Task Result:'
JobStatusResult(job_status='Completed')
  6. You can sign in to your Unstructured account to see the results:
    • On the sidebar, click Connectors to see the source and destination connectors.
    • On the sidebar, click Workflows to see the workflow.
    • On the sidebar, click Jobs to see the job.
  7. If you do not want to keep the MCP server running, you can stop it by pressing Ctrl+C in the terminal or command prompt window where you ran the make sse-server command.

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