Customize Deep Agents

create_deep_agent has the following core configuration options:

create_deep_agent(
    name: str | None = None,
    model: str | BaseChatModel | None = None,
    tools: Sequence[BaseTool | Callable | dict[str, Any]] | None = None,
    *,
    system_prompt: str | SystemMessage | None = None
) -> CompiledStateGraph

For more information, see create_deep_agent.

Model

By default, deepagents uses claude-sonnet-4-5-20250929. You can customize the model by passing any supported or LangChain model object.

Use the provider:model format (for example openai:gpt-5) to quickly switch between models.

👉 Read the OpenAI chat model integration docs

pip install -U "langchain[openai]"

import os
from deepagents import create_deep_agent

os.environ["OPENAI_API_KEY"] = "sk-..."

agent = create_deep_agent(model="openai:gpt-5.2")
# this calls init_chat_model for the specified model with default parameters
# to use specific modele parameters, use init_chat_model directly

👉 Read the Anthropic chat model integration docs

pip install -U "langchain[anthropic]"

import os
from deepagents import create_deep_agent

os.environ["ANTHROPIC_API_KEY"] = "sk-..."

agent = create_deep_agent(model="claude-sonnet-4-5-20250929")
# this calls init_chat_model for the specified model with default parameters
# to use specific modele parameters, use init_chat_model directly

👉 Read the Azure chat model integration docs

pip install -U "langchain[openai]"

import os
from deepagents import create_deep_agent

os.environ["AZURE_OPENAI_API_KEY"] = "..."
os.environ["AZURE_OPENAI_ENDPOINT"] = "..."
os.environ["OPENAI_API_VERSION"] = "2025-03-01-preview"

agent = create_deep_agent(model="azure_openai:gpt-4.1")
# this calls init_chat_model for the specified model with default parameters
# to use specific modele parameters, use init_chat_model directly

👉 Read the Google GenAI chat model integration docs

pip install -U "langchain[google-genai]"

import os
from deepagents import create_deep_agent

os.environ["GOOGLE_API_KEY"] = "..."

agent = create_deep_agent(model="google_genai:gemini-2.5-flash-lite")
# this calls init_chat_model for the specified model with default parameters
# to use specific modele parameters, use init_chat_model directly

👉 Read the AWS Bedrock chat model integration docs

pip install -U "langchain[aws]"

from deepagents import create_deep_agent

# Follow the steps here to configure your credentials:
# https://docs.aws.amazon.com/bedrock/latest/userguide/getting-started.html

agent = create_deep_agent(
    model="anthropic.claude-3-5-sonnet-20240620-v1:0",
    model_provider="bedrock_converse",
)
# this calls init_chat_model for the specified model with default parameters
# to use specific modele parameters, use init_chat_model directly

👉 Read the HuggingFace chat model integration docs

pip install -U "langchain[huggingface]"

import os
from deepagents import create_deep_agent

os.environ["HUGGINGFACEHUB_API_TOKEN"] = "hf_..."

agent = create_deep_agent(
    model="microsoft/Phi-3-mini-4k-instruct",
    model_provider="huggingface",
    temperature=0.7,
    max_tokens=1024,
)
# this calls init_chat_model for the specified model with default parameters
# to use specific modele parameters, use init_chat_model directly

Tools

In addition to built-in tools for planning, file management, and subagent spawning, you can provide custom tools:

import os
from typing import Literal
from tavily import TavilyClient
from deepagents import create_deep_agent

tavily_client = TavilyClient(api_key=os.environ["TAVILY_API_KEY"])

def internet_search(
    query: str,
    max_results: int = 5,
    topic: Literal["general", "news", "finance"] = "general",
    include_raw_content: bool = False,
):
    """Run a web search"""
    return tavily_client.search(
        query,
        max_results=max_results,
        include_raw_content=include_raw_content,
        topic=topic,
    )

agent = create_deep_agent(
    tools=[internet_search]
)

System prompt

Deep agents come with a built-in system prompt. The default system prompt contains detailed instructions for using the built-in planning tool, file system tools, and subagents. When middleware add special tools, like the filesystem tools, it appends them to the system prompt. Each deep agent should also include a custom system prompt specific to its specific use case:

from deepagents import create_deep_agent

research_instructions = """\
You are an expert researcher. Your job is to conduct \
thorough research, and then write a polished report. \
"""

agent = create_deep_agent(
    system_prompt=research_instructions,
)

Middleware

By default, deep agents have access to the following middleware:

TodoListMiddleware: Tracks and manages todo lists for organizing agent tasks and work
FilesystemMiddleware: Handles file system operations such as reading, writing, and navigating directories
SubAgentMiddleware: Spawns and coordinates subagents for delegating tasks to specialized agents
SummarizationMiddleware: Condenses message history to stay within context limits when conversations grow long
AnthropicPromptCachingMiddleware: Automatic reduction of redundant token processing when using Anthropic models
PatchToolCallsMiddleware: Automatic message history fixes when tool calls are interrupted or cancelled before receiving results

If you are using memory, skills, or human-in-the-loop, the following middleware is also included:

MemoryMiddleware: Persists and retrieves conversation context across sessions when the memory argument is provided
SkillsMiddleware: Enables custom skills when the skills argument is provided
HumanInTheLoopMiddleware: Pauses for human approval or input at specified points when the interrupt_on argument is provided

You can provide additional middleware to extend functionality, add tools, or implement custom hooks:

from langchain.tools import tool
from langchain.agents.middleware import wrap_tool_call
from deepagents import create_deep_agent


@tool
def get_weather(city: str) -> str:
    """Get the weather in a city."""
    return f"The weather in {city} is sunny."


call_count = [0]  # Use list to allow modification in nested function

@wrap_tool_call
def log_tool_calls(request, handler):
    """Intercept and log every tool call - demonstrates cross-cutting concern."""
    call_count[0] += 1
    tool_name = request.name if hasattr(request, 'name') else str(request)

    print(f"[Middleware] Tool call #{call_count[0]}: {tool_name}")
    print(f"[Middleware] Arguments: {request.args if hasattr(request, 'args') else 'N/A'}")

    # Execute the tool call
    result = handler(request)

    # Log the result
    print(f"[Middleware] Tool call #{call_count[0]} completed")

    return result


agent = create_deep_agent(
    tools=[get_weather],
    middleware=[log_tool_calls],
)

Subagents

To isolate detailed work and avoid context bloat, use subagents:

import os
from typing import Literal
from tavily import TavilyClient
from deepagents import create_deep_agent

tavily_client = TavilyClient(api_key=os.environ["TAVILY_API_KEY"])

def internet_search(
    query: str,
    max_results: int = 5,
    topic: Literal["general", "news", "finance"] = "general",
    include_raw_content: bool = False,
):
    """Run a web search"""
    return tavily_client.search(
        query,
        max_results=max_results,
        include_raw_content=include_raw_content,
        topic=topic,
    )

research_subagent = {
    "name": "research-agent",
    "description": "Used to research more in depth questions",
    "system_prompt": "You are a great researcher",
    "tools": [internet_search],
    "model": "openai:gpt-4.1",  # Optional override, defaults to main agent model
}
subagents = [research_subagent]

agent = create_deep_agent(
    model="claude-sonnet-4-5-20250929",
    subagents=subagents
)

For more information, see Subagents.

Backends

Deep agent tools can make use of virtual file systems to store, access, and edit files. By default, deep agents use a StateBackend. If you are using skills or memory, you must add the expected skill or memory files to the backend before creating the agent.

StateBackend
FilesystemBackend
StoreBackend
CompositeBackend

An ephemeral filesystem backend stored in langgraph state.This filesystem only persists for a single thread.

# By default we provide a StateBackend
agent = create_deep_agent()

# Under the hood, it looks like
from deepagents.backends import StateBackend

agent = create_deep_agent(
    backend=(lambda rt: StateBackend(rt))   # Note that the tools access State through the runtime.state
)

The local machine’s filesystem.

This backend grants agents direct filesystem read/write access. Use with caution and only in appropriate environments. For more information, see FilesystemBackend.

from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    backend=FilesystemBackend(root_dir=".", virtual_mode=True)
)

A filesystem that provides long-term storage that is persisted across threads.

from langgraph.store.memory import InMemoryStore
from deepagents.backends import StoreBackend

agent = create_deep_agent(
    backend=(lambda rt: StoreBackend(rt)),
    store=InMemoryStore()  # Good for local dev; omit for LangSmith Deployment
)

When deploying to LangSmith Deployment, omit the store parameter. The platform automatically provisions a store for your agent.

A flexible backend where you can specify different routes in the filesystem to point towards different backends.

from deepagents import create_deep_agent
from deepagents.backends import CompositeBackend, StateBackend, StoreBackend
from langgraph.store.memory import InMemoryStore

composite_backend = lambda rt: CompositeBackend(
    default=StateBackend(rt),
    routes={
        "/memories/": StoreBackend(rt),
    }
)

agent = create_deep_agent(
    backend=composite_backend,
    store=InMemoryStore()  # Store passed to create_deep_agent, not backend
)

For more information, see Backends.

Sandboxes

Sandboxes are specialized backends that run agent code in an isolated environment with their own filesystem and an execute tool for shell commands. Use a sandbox backend when you want your deep agent to write files, install dependencies, and run commands without changing anything on your local machine. You configure sandboxes by passing a sandbox backend to backend when creating your deep agent:

Modal
Runloop
Daytona

pip install langchain-modal

import modal
from langchain_anthropic import ChatAnthropic

from deepagents import create_deep_agent
from langchain_modal import ModalSandbox

app = modal.App.lookup("your-app")
modal_sandbox = modal.Sandbox.create(app=app)
backend = ModalSandbox(sandbox=modal_sandbox)

agent = create_deep_agent(
    model=ChatAnthropic(model="claude-sonnet-4-20250514"),
    system_prompt="You are a Python coding assistant with sandbox access.",
    backend=backend,
)

result = agent.invoke(
    {
        "messages": [
            {
                "role": "user",
                "content": "Create a small Python package and run pytest",
            }
        ]
    }
)

modal_sandbox.terminate()

pip install langchain-runloop

import os

from runloop_api_client import RunloopSDK
from langchain_anthropic import ChatAnthropic

from deepagents import create_deep_agent
from langchain_runloop import RunloopSandbox

client = RunloopSDK(bearer_token=os.environ["RUNLOOP_API_KEY"])

devbox = client.devbox.create()
backend = RunloopSandbox(devbox=devbox)

agent = create_deep_agent(
    model=ChatAnthropic(model="claude-sonnet-4-20250514"),
    system_prompt="You are a Python coding assistant with sandbox access.",
    backend=backend,
)

try:
    result = agent.invoke(
        {
            "messages": [
                {
                    "role": "user",
                    "content": "Create a small Python package and run pytest",
                }
            ]
        }
    )
finally:
    devbox.shutdown()

pip install langchain-daytona

from daytona import Daytona
from langchain_anthropic import ChatAnthropic

from deepagents import create_deep_agent
from langchain_daytona import DaytonaSandbox

sandbox = Daytona().create()
backend = DaytonaSandbox(sandbox=sandbox)

agent = create_deep_agent(
    model=ChatAnthropic(model="claude-sonnet-4-20250514"),
    system_prompt="You are a Python coding assistant with sandbox access.",
    backend=backend,
)

result = agent.invoke(
    {
        "messages": [
            {
                "role": "user",
                "content": "Create a small Python package and run pytest",
            }
        ]
    }
)

sandbox.stop()

For more information, see Sandboxes.

Human-in-the-loop

Some tool operations may be sensitive and require human approval before execution. You can configure the approval for each tool:

from langchain.tools import tool
from deepagents import create_deep_agent
from langgraph.checkpoint.memory import MemorySaver

@tool
def delete_file(path: str) -> str:
    """Delete a file from the filesystem."""
    return f"Deleted {path}"

@tool
def read_file(path: str) -> str:
    """Read a file from the filesystem."""
    return f"Contents of {path}"

@tool
def send_email(to: str, subject: str, body: str) -> str:
    """Send an email."""
    return f"Sent email to {to}"

# Checkpointer is REQUIRED for human-in-the-loop
checkpointer = MemorySaver()

agent = create_deep_agent(
    model="claude-sonnet-4-5-20250929",
    tools=[delete_file, read_file, send_email],
    interrupt_on={
        "delete_file": True,  # Default: approve, edit, reject
        "read_file": False,   # No interrupts needed
        "send_email": {"allowed_decisions": ["approve", "reject"]},  # No editing
    },
    checkpointer=checkpointer  # Required!
)

You can configure interrupt for agents and subagents on tool call as well as from within tool calls. For more information, see Human-in-the-loop.

Skills

You can use skills to provide your deep agent with new capabilities and expertise. While tools tend to cover lower level functionality like native file system actions or planning, skills can contain detailed instructions on how to complete tasks, reference info, and other assets, such as templates. These files are only loaded by the agent when the agent has determined that the skill is useful for the current prompt. This progressive disclosure reduces the amount of tokens and context the agent has to consider upon startup. For example skills, see Deep Agent example skills. To add skills to your deep agent, pass them as an argument to create_deep_agent:

StateBackend
StoreBackend
FilesystemBackend

from urllib.request import urlopen
from deepagents import create_deep_agent
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/cli/examples/skills/langgraph-docs/SKILL.md"
with urlopen(skill_url) as response:
    skill_content = response.read().decode('utf-8')

skills_files = {
    "/skills/langgraph-docs/SKILL.md": create_file_data(skill_content)
}

agent = create_deep_agent(
    skills=["./skills/"],
    checkpointer=checkpointer,
)

result = agent.invoke(
    {
        "messages": [
            {
                "role": "user",
                "content": "What is langgraph?",
            }
        ],
        # Seed the default StateBackend's in-state filesystem (virtual paths must start with "/").
        "files": skills_files
    },
    config={"configurable": {"thread_id": "12345"}},
)

from urllib.request import urlopen
from deepagents import create_deep_agent
from deepagents.backends import StoreBackend
from deepagents.backends.utils import create_file_data
from langgraph.store.memory import InMemoryStore


store = InMemoryStore()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/cli/examples/skills/langgraph-docs/SKILL.md"
with urlopen(skill_url) as response:
    skill_content = response.read().decode('utf-8')

store.put(
    namespace=("filesystem",),
    key="/skills/langgraph-docs/SKILL.md",
    value=create_file_data(skill_content)
)

agent = create_deep_agent(
    backend=(lambda rt: StoreBackend(rt)),
    store=store,
    skills=["/skills/"]
)

result = agent.invoke(
    {
        "messages": [
            {
                "role": "user",
                "content": "What is langgraph?",
            }
        ]
    },
    config={"configurable": {"thread_id": "12345"}},
)

from deepagents import create_deep_agent
from langgraph.checkpoint.memory import MemorySaver
from deepagents.backends.filesystem import FilesystemBackend

# Checkpointer is REQUIRED for human-in-the-loop
checkpointer = MemorySaver()

agent = create_deep_agent(
    backend=FilesystemBackend(root_dir="/Users/user/{project}"),
    skills=["/Users/user/{project}/skills/"],
    interrupt_on={
        "write_file": True,  # Default: approve, edit, reject
        "read_file": False,  # No interrupts needed
        "edit_file": True    # Default: approve, edit, reject
    },
    checkpointer=checkpointer,  # Required!
)

result = agent.invoke(
    {
        "messages": [
            {
                "role": "user",
                "content": "What is langgraph?",
            }
        ]
    },
    config={"configurable": {"thread_id": "12345"}},
)

Memory

Use AGENTS.md files to provide extra context to your deep agent. You can pass one or more file paths to the memory parameter when creating your deep agent:

StateBackend
StoreBackend
FilesystemBackend

from urllib.request import urlopen

from deepagents import create_deep_agent
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

with urlopen("https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/examples/text-to-sql-agent/AGENTS.md") as response:
    agents_md = response.read().decode("utf-8")
checkpointer = MemorySaver()

agent = create_deep_agent(
    memory=[
        "/AGENTS.md"
    ],
    checkpointer=checkpointer,
)

result = agent.invoke(
    {
        "messages": [
            {
                "role": "user",
                "content": "Please tell me what's in your memory files.",
            }
        ],
        # Seed the default StateBackend's in-state filesystem (virtual paths must start with "/").
        "files": {"/AGENTS.md": create_file_data(agents_md)},
    },
    config={"configurable": {"thread_id": "123456"}},
)

from urllib.request import urlopen

from deepagents import create_deep_agent
from deepagents.backends import StoreBackend
from deepagents.backends.utils import create_file_data
from langgraph.store.memory import InMemoryStore

with urlopen("https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/examples/text-to-sql-agent/AGENTS.md") as response:
    agents_md = response.read().decode("utf-8")

# Create the store and add the file to it
store = InMemoryStore()
file_data = create_file_data(agents_md)
store.put(
    namespace=("filesystem",),
    key="/AGENTS.md",
    value=file_data
)

agent = create_deep_agent(
    backend=(lambda rt: StoreBackend(rt)),
    store=store,
    memory=[
        "/AGENTS.md"
    ]
)

result = agent.invoke(
    {
        "messages": [
            {
                "role": "user",
                "content": "Please tell me what's in your memory files.",
            }
        ],
        "files": {"/AGENTS.md": create_file_data(agents_md)},
    },
    config={"configurable": {"thread_id": "12345"}},
)

from deepagents import create_deep_agent
from langgraph.checkpoint.memory import MemorySaver
from deepagents.backends import FilesystemBackend

# Checkpointer is REQUIRED for human-in-the-loop
checkpointer = MemorySaver()

agent = create_deep_agent(
    backend=FilesystemBackend(root_dir="/Users/user/{project}"),
    memory=[
        "./AGENTS.md"
    ],
    interrupt_on={
        "write_file": True,  # Default: approve, edit, reject
        "read_file": False,  # No interrupts needed
        "edit_file": True    # Default: approve, edit, reject
    },
    checkpointer=checkpointer,  # Required!
)

Structured ouput

Deep agents support structured ouput. You can set a desired structured output schema by passing it as the response_format argument to the call to create_deep_agent(). When the model generates the structured data, it’s captured, validated, and returned in the ‘structured_response’ key of the deep agent’s state.

import os
from typing import Literal
from pydantic import BaseModel, Field
from tavily import TavilyClient
from deepagents import create_deep_agent

tavily_client = TavilyClient(api_key=os.environ["TAVILY_API_KEY"])

def internet_search(
    query: str,
    max_results: int = 5,
    topic: Literal["general", "news", "finance"] = "general",
    include_raw_content: bool = False,
):
    """Run a web search"""
    return tavily_client.search(
        query,
        max_results=max_results,
        include_raw_content=include_raw_content,
        topic=topic,
    )

class WeatherReport(BaseModel):
    """A structured weather report with current conditions and forecast."""
    location: str = Field(description="The location for this weather report")
    temperature: float = Field(description="Current temperature in Celsius")
    condition: str = Field(description="Current weather condition (e.g., sunny, cloudy, rainy)")
    humidity: int = Field(description="Humidity percentage")
    wind_speed: float = Field(description="Wind speed in km/h")
    forecast: str = Field(description="Brief forecast for the next 24 hours")


agent = create_deep_agent(
    response_format=WeatherReport,
    tools=[internet_search]
)

result = agent.invoke({
    "messages": [{
        "role": "user",
        "content": "What's the weather like in San Francisco?"
    }]
})

print(result["structured_response"])
# location='San Francisco, California' temperature=18.3 condition='Sunny' humidity=48 wind_speed=7.6 forecast='Pleasant sunny conditions expected to continue with temperatures around 64°F (18°C) during the day, dropping to around 52°F (11°C) at night. Clear skies with minimal precipitation expected.'

For more information and examples, see response format.

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Get started

Core capabilities

Protocols

Command line interface

Model

Tools

System prompt

Middleware

Subagents

Backends

Sandboxes

Human-in-the-loop

Skills

Memory

Structured ouput

Get started

Core capabilities

Protocols

Command line interface

​Model

​Tools

​System prompt

​Middleware

​Subagents

​Backends

​Sandboxes

​Human-in-the-loop

​Skills

​Memory

​Structured ouput

Model

Tools

System prompt

Middleware

Subagents

Backends

Sandboxes

Human-in-the-loop

Skills

Memory

Structured ouput