Agent Containers

Containerize your agents when you need custom system dependencies, specific base images, or full control over the runtime environment. Unlike serverless agents that run on agent-workers, containerized agents are packaged as Docker images you build and deploy.

When to Use Containers

Use Containers when:

✅ Need to customize agent code logic (xpander_handler.py)
✅ Integrate MCP servers that run locally (not in cloud)
✅ Need custom system dependencies (apt packages, libraries)
✅ Require specific base images or Python versions
✅ Want full control over runtime environment
✅ Need custom tools, models, or integrations

Use Serverless (Workbench only) when:

❌ Building agents with Workbench UI
❌ Don’t need custom code logic
❌ Standard connectors are sufficient
❌ Don’t want to manage code or Docker builds

See Agent Serverless for the no-code deployment mode.

Real-World Example: MCP Integration

Here’s an example of a containerized agent that integrates Alpha Vantage MCP for financial market analysis:

xpander_handler.py

import os
import logging
from typing import Optional
from dotenv import load_dotenv
from xpander_sdk import Task, on_task, Backend, Tokens
from agno.agent import Agent
from agno.models.openai import OpenAIChat
from agno.tools.mcp import MCPTools

load_dotenv()

logger = logging.getLogger(__name__)

@on_task
async def my_agent_handler(task: Task) -> Task:
    """
    Financial Insights Specialist Agent Handler.

    This agent provides comprehensive financial market analysis using:
    - Alpha Vantage MCP for real-time and historical market data
    - OpenAI GPT-5.2 with high reasoning effort for deep analysis
    - Xpander platform for storage, events, and task management
    """
    # Get xpander agent details
    backend = Backend(configuration=task.configuration)
    agno_args = await backend.aget_args(task=task)

    # Loads Specialized MCP for financial data
    alpha_api_key: Optional[str] = os.getenv('ALPHAVANTAGE_API_KEY')
    if not alpha_api_key:
        logger.error('ALPHAVANTAGE_API_KEY not found in environment variables')
        task.result = (
            'Error: ALPHAVANTAGE_API_KEY is required. '
            'Please set it in your environment variables.'
        )
        return task

    server_url = f'https://mcp.alphavantage.co/mcp?apikey={alpha_api_key}'
    mcp_tools = MCPTools(url=server_url, transport='streamable-http')

    try:
        await mcp_tools.connect()
        agno_agent = Agent(**agno_args)
        agno_agent.tools.append(mcp_tools)

        # Configure reasoning effort for long running agentic tasks
        agno_agent.model = OpenAIChat(id='gpt-5.2', reasoning_effort='high')

        # Run the agent
        result = await agno_agent.arun(
            input=task.to_message(),
            files=task.get_files(),
            images=task.get_images()
        )

        task.result = result.content

        # Report execution metrics
        task.tokens = Tokens(
            prompt_tokens=result.metrics.input_tokens,
            completion_tokens=result.metrics.output_tokens
        )
        task.used_tools = [tool.tool_name for tool in result.tools]

    except Exception as e:
        logger.exception(f'Error processing task: {e}')
        task.result = f'Error: {str(e)}'
    finally:
        await mcp_tools.close()

    return task

Why this needs containers:

Custom MCP Integration: Connects to Alpha Vantage MCP server with custom authentication
Custom Model Configuration: Uses OpenAI GPT-5.2 with specific reasoning effort settings
Custom Error Handling: Implements specialized logging and error management
Environment-Specific Logic: Requires ALPHAVANTAGE_API_KEY from environment

This level of customization requires code and containerization - it can’t be built with Workbench UI alone.

Quick Start

Install xpander CLI

npm install -g xpander-cli && xpander login

Create New Agent Project

mkdir hello-world && cd hello-world
xpander agent new --name "hello-world" --framework agno --folder .

This creates:

xpander_handler.py - Agent code
requirements.txt - Python dependencies
Dockerfile - Container definition
.env - Environment variables
agent.yaml - Agent configuration

Setup Virtual Environment

python3 -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt

Test Locally

xpander dev

Runs agent locally without containerization for fast iteration.

Test Container Locally

docker build . -t my-agent
docker run --env-file .env my-agent

Verify your container builds and runs correctly before deploying.

Deploy Container

xpander deploy

Builds Docker image, pushes to registry, and deploys to xpander platform.

View Logs

xpander logs

Invoke Agent

xpander invoke

Or use the SDK, REST API, Slack, webhooks, or any integration.

Project Structure

After running xpander agent new, your project contains:

hello-world/
├── xpander_handler.py    # Agent logic with @on_task decorator
├── requirements.txt       # Python dependencies
├── Dockerfile            # Container definition
├── .env                  # Environment variables (API keys)
├── agent.yaml            # Agent metadata
└── .venv/                # Virtual environment (created manually)

xpander_handler.py

from dotenv import load_dotenv
load_dotenv()

from xpander_sdk import Task, on_task, Backend, Tokens
from agno.agent import Agent

@on_task
async def my_agent_handler(task: Task):
    backend = Backend(configuration=task.configuration)
    agno_args = await backend.aget_args(task=task)
    agno_agent = Agent(**agno_args)

    result = await agno_agent.arun(
        input=task.to_message(),
        user_id=task.user_id,
        session_id=task.session_id
    )

    task.result = result.content
    task.tokens = Tokens(
        prompt_tokens=result.metrics.input_tokens,
        completion_tokens=result.metrics.output_tokens
    )

    return task

Dockerfile

FROM python:3.11-slim

WORKDIR /app

# Install system dependencies if needed
# RUN apt-get update && apt-get install -y \
#     build-essential \
#     && rm -rf /var/lib/apt/lists/*

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD ["python", "-m", "xpander_sdk.agent_worker"]

requirements.txt

xpander-sdk
agno
python-dotenv

Customizing Your Container

Add System Dependencies

Edit Dockerfile to install OS-level packages:

FROM python:3.11-slim

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    libpq-dev \
    ffmpeg \
    && rm -rf /var/lib/apt/lists/*

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD ["python", "-m", "xpander_sdk.agent_worker"]

Use Different Base Image

FROM python:3.12-slim
# or
FROM nvidia/cuda:12.1-runtime-ubuntu22.04
# or
FROM continuumio/miniconda3

Add Private Dependencies

# Copy private package
COPY ./my-private-package /app/my-private-package
RUN pip install /app/my-private-package

# Or install from private registry
ARG PYPI_TOKEN
RUN pip install --index-url https://${PYPI_TOKEN}@pypi.example.com my-package

Local Development Workflow

1. Develop Without Container

# Activate virtual environment
source .venv/bin/activate

# Run agent locally (fast iteration)
xpander dev

This runs your agent code directly without containerization, making development faster.

2. Test Container Locally

# Build container
docker build . -t my-agent

# Run container with environment variables
docker run --env-file .env my-agent

# Or pass variables directly
docker run -e XPANDER_API_KEY=xxx -e OPENAI_API_KEY=yyy my-agent

3. Deploy to Production

xpander deploy

The CLI:

Builds your Docker image
Pushes to container registry
Deploys to xpander platform
Makes agent available via API/SDK/Slack/webhooks

Environment Variables

Store sensitive configuration in .env file:

.env

XPANDER_API_KEY=xpk_xxx
OPENAI_API_KEY=sk-xxx
DATABASE_URL=postgresql://...
CUSTOM_API_ENDPOINT=https://api.example.com

These variables are:

Used during local development (xpander dev)
Loaded into container during local testing (docker run --env-file .env)
Securely injected during production deployment (xpander deploy)

Never commit .env to version control. Add it to .gitignore.

Invoking Containerized Agents

Once deployed, invoke your containerized agent the same way as serverless agents:

CLI
SDK
REST API

xpander invoke

from xpander_sdk import Backend, Configuration

backend = Backend(configuration=Configuration(api_key="<your-key>"))

result = backend.invoke_agent(
    agent_id="<agent-id>",
    input="Your message",
    user_id="user@example.com",
    session_id="session-123"
)

print(result)

curl -X POST https://api.xpander.ai/v1/agents/{agent_id}/invoke \
  -H "Authorization: Bearer <your-key>" \
  -H "Content-Type: application/json" \
  -d '{
    "input": "Your message",
    "user_id": "user@example.com",
    "session_id": "session-123"
  }'

CLI Commands Reference

Command	Description
`xpander login`	Authenticate with xpander platform
`xpander agent new`	Create new agent project with Dockerfile
`xpander dev`	Run agent locally without container
`xpander deploy`	Build, push, and deploy container
`xpander invoke`	Test deployed agent
`xpander logs`	View agent execution logs

Container vs Serverless

Feature	Containers	Serverless
Use Case	Custom dependencies, full control	Most agents, standard dependencies
Deployment	Build Docker image, push to registry	Automatic via Workbench
Infrastructure	Your container registry + orchestration	Agent-workers (managed or self-hosted)
Complexity	Docker knowledge required	Zero infrastructure management
Flexibility	Full control over environment	Pre-configured runtime
Setup Time	Manual Dockerfile configuration	Instant

Troubleshooting

Build Fails

# View build logs
docker build . -t my-agent --progress=plain

# Check for missing dependencies
docker run --rm my-agent pip list

Container Runs Locally But Fails in Production

Verify environment variables are set correctly
Check logs: xpander logs
Ensure base image architecture matches deployment target
Validate network access to external APIs

Large Image Size

# Use slim base images
FROM python:3.11-slim

# Clean up apt cache
RUN apt-get update && apt-get install -y package \
    && rm -rf /var/lib/apt/lists/*

# Use multi-stage builds
FROM python:3.11 as builder
RUN pip install --user -r requirements.txt

FROM python:3.11-slim
COPY --from=builder /root/.local /root/.local

Agent Serverless

Default deployment mode without containers

Self-Hosted Deployment

Run on your own infrastructure

CLI Reference

Complete CLI command reference

Start

Build

Types of Agents in xpander

Manage

When to Use Containers

Real-World Example: MCP Integration

Quick Start

Project Structure

xpander_handler.py

Dockerfile

requirements.txt

Customizing Your Container

Add System Dependencies

Use Different Base Image

Add Private Dependencies

Local Development Workflow

1. Develop Without Container

2. Test Container Locally

3. Deploy to Production

Environment Variables

Invoking Containerized Agents

CLI Commands Reference

Container vs Serverless

Troubleshooting

Build Fails

Container Runs Locally But Fails in Production

Large Image Size

Agent Serverless

Self-Hosted Deployment

CLI Reference

​When to Use Containers

​Real-World Example: MCP Integration

​Quick Start

​Project Structure

​xpander_handler.py

​Dockerfile

​requirements.txt

​Customizing Your Container

​Add System Dependencies

​Use Different Base Image

​Add Private Dependencies

​Local Development Workflow

​1. Develop Without Container

​2. Test Container Locally

​3. Deploy to Production

​Environment Variables

​Invoking Containerized Agents

​CLI Commands Reference

​Container vs Serverless

​Troubleshooting

​Build Fails

​Container Runs Locally But Fails in Production

​Large Image Size

​Related

Agent Serverless

Self-Hosted Deployment

CLI Reference

When to Use Containers

Real-World Example: MCP Integration

Quick Start

Project Structure

xpander_handler.py

Dockerfile

requirements.txt

Customizing Your Container

Add System Dependencies

Use Different Base Image

Add Private Dependencies

Local Development Workflow

1. Develop Without Container

2. Test Container Locally

3. Deploy to Production

Environment Variables

Invoking Containerized Agents

CLI Commands Reference

Container vs Serverless

Troubleshooting

Build Fails

Container Runs Locally But Fails in Production

Large Image Size

Related