Customize Deep Agents

Build the harness around your goal. create_deep_agent gives you a production-ready foundation: connect it to your data, shape its behavior, and add the capabilities your use case needs.

from deepagents import create_deep_agent

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    system_prompt="You are a helpful assistant.",
    tools=[search, fetch_url],
    memory=["./AGENTS.md"],
    skills=["./skills/"],
)

from deepagents import create_deep_agent

agent = create_deep_agent(
    model="openai:gpt-5.5",
    system_prompt="You are a helpful assistant.",
    tools=[search, fetch_url],
    memory=["./AGENTS.md"],
    skills=["./skills/"],
)

from deepagents import create_deep_agent

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    system_prompt="You are a helpful assistant.",
    tools=[search, fetch_url],
    memory=["./AGENTS.md"],
    skills=["./skills/"],
)

from deepagents import create_deep_agent

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    system_prompt="You are a helpful assistant.",
    tools=[search, fetch_url],
    memory=["./AGENTS.md"],
    skills=["./skills/"],
)

from deepagents import create_deep_agent

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    system_prompt="You are a helpful assistant.",
    tools=[search, fetch_url],
    memory=["./AGENTS.md"],
    skills=["./skills/"],
)

from deepagents import create_deep_agent

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    system_prompt="You are a helpful assistant.",
    tools=[search, fetch_url],
    memory=["./AGENTS.md"],
    skills=["./skills/"],
)

from deepagents import create_deep_agent

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    system_prompt="You are a helpful assistant.",
    tools=[search, fetch_url],
    memory=["./AGENTS.md"],
    skills=["./skills/"],
)

Parameter	What it does
`model=`	Which model to use
`system_prompt=`	Custom instructions for the agent
`tools=`	Domain tools the agent can call
`memory=`	AGENTS.md files loaded at startup
`skills=`	Skills directory for on-demand knowledge
`backend=`	Filesystem backend (StateBackend by default)
`permissions=`	Path-level access control for the filesystem
`subagents=`	Custom subagents for delegated tasks
`middleware=`	Extra middleware merged into the Deep Agents stack; an instance whose `.name` matches a built-in entry replaces it in place, anything else lands after the last core middleware entry and before the profile, prompt-caching, and memory
`interrupt_on=`	Pause before tool calls for human approval
`response_format=`	Structured output schema
`state_schema=`	Custom graph state schema
`context_schema=`	Per-run runtime context schema (user IDs, API keys, feature flags)
profiles	Per-model defaults as a reusable bundle

Full function signature

create_deep_agent(
    model: str | BaseChatModel | None = None,
    tools: Sequence[BaseTool | Callable | dict[str, Any]] | None = None,
    *,
    system_prompt: str | SystemMessage | None = None,
    middleware: Sequence[AgentMiddleware[StateT_co, ContextT]] = (),
    subagents: Sequence[SubAgent | CompiledSubAgent | AsyncSubAgent] | None = None,
    skills: list[str] | None = None,
    memory: list[str] | None = None,
    permissions: list[FilesystemPermission] | None = None,
    backend: BackendProtocol | None = None,
    interrupt_on: dict[str, bool | InterruptOnConfig] | None = None,
    response_format: ResponseFormat[ResponseT] | type[ResponseT] | dict[str, Any] | None = None,
    state_schema: type[DeepAgentState] | None = None,
    context_schema: type[ContextT] | None = None,
    checkpointer: Checkpointer | None = None,
    store: BaseStore | None = None,
    debug: bool = False,
    name: str | None = None,
    cache: BaseCache | None = None
) -> CompiledStateGraph[AgentState[ResponseT], ContextT, InputAgentState, OutputAgentState[ResponseT]]

For the full parameter list, see the create_deep_agent API reference. To compose a fully custom harness from scratch, see Configure the harness or follow the step-by-step Build a deep agent from scratch guide.

As you add tools, subagents, and backends, use LangSmith to trace how each piece behaves together. Follow the observability quickstart to get set up, and see Going to production for deployment on LangSmith.We recommend you also set up LangSmith Engine, which monitors your traces, detects issues, and proposes fixes.

Model

Pass a model string in provider:model format, or an initialized model instance. See supported models for all providers and suggested models for tested recommendations.

Use the provider:model format (for example openai:gpt-5.5) to quickly switch between models.

👉 Read the OpenAI chat model integration docs

pip install -U "langchain[openai]"

uv add "langchain[openai]"

import os
from deepagents import create_deep_agent

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

agent = create_deep_agent(model="openai:gpt-5.5")
# this calls init_chat_model for the specified model with default parameters
# to use specific model parameters, use init_chat_model directly

import os
from langchain.chat_models import init_chat_model
from deepagents import create_deep_agent

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

model = init_chat_model(model="openai:gpt-5.5")
agent = create_deep_agent(model=model)

import os
from langchain_openai import ChatOpenAI
from deepagents import create_deep_agent

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

model = ChatOpenAI(model="gpt-5.5")
agent = create_deep_agent(model=model)

👉 Read the Anthropic chat model integration docs

pip install -U "langchain[anthropic]"

uv add "langchain[anthropic]"

import os
from deepagents import create_deep_agent

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

agent = create_deep_agent(model="anthropic:claude-sonnet-4-6")
# this calls init_chat_model for the specified model with default parameters
# to use specific model parameters, use init_chat_model directly

import os
from langchain.chat_models import init_chat_model
from deepagents import create_deep_agent

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

model = init_chat_model(model="claude-sonnet-4-6")
agent = create_deep_agent(model=model)

import os
from langchain_anthropic import ChatAnthropic
from deepagents import create_deep_agent

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

model = ChatAnthropic(model="claude-sonnet-4-6")
agent = create_deep_agent(model=model)

👉 Read the Azure chat model integration docs

pip install -U "langchain[openai]"

uv add "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-5.5")
# this calls init_chat_model for the specified model with default parameters
# to use specific model parameters, use init_chat_model directly

import os
from langchain.chat_models import init_chat_model
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"

model = init_chat_model(
    model="azure_openai:gpt-5.5",
    azure_deployment=os.environ["AZURE_OPENAI_DEPLOYMENT_NAME"],
)
agent = create_deep_agent(model=model)

import os
from langchain_openai import AzureChatOpenAI
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"

model = AzureChatOpenAI(
    model="gpt-5.5",
    azure_deployment=os.environ["AZURE_OPENAI_DEPLOYMENT_NAME"],
)
agent = create_deep_agent(model=model)

👉 Read the Google GenAI chat model integration docs

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

uv add "langchain[google-genai]"

import os
from deepagents import create_deep_agent

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

agent = create_deep_agent(model="google_genai:gemini-3.6-flash")
# this calls init_chat_model for the specified model with default parameters
# to use specific model parameters, use init_chat_model directly

import os
from langchain.chat_models import init_chat_model
from deepagents import create_deep_agent

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

model = init_chat_model(model="google_genai:gemini-3.6-flash")
agent = create_deep_agent(model=model)

import os
from langchain_google_genai import ChatGoogleGenerativeAI
from deepagents import create_deep_agent

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

model = ChatGoogleGenerativeAI(model="gemini-3.6-flash")
agent = create_deep_agent(model=model)

👉 Read the AWS Bedrock chat model integration docs

pip install -U "langchain[aws]"

uv add "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-sonnet-4-6",
    model_provider="bedrock_converse",
)
# this calls init_chat_model for the specified model with default parameters
# to use specific model parameters, use init_chat_model directly

from langchain.chat_models import init_chat_model
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

model = init_chat_model(
    model="anthropic.claude-sonnet-4-6",
    model_provider="bedrock_converse",
)
agent = create_deep_agent(model=model)

from langchain_aws import ChatBedrock
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

model = ChatBedrock(model="anthropic.claude-sonnet-4-6")
agent = create_deep_agent(model=model)

👉 Read the HuggingFace chat model integration docs

pip install -U "langchain[huggingface]"

uv add "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 model parameters, use init_chat_model directly

import os
from langchain.chat_models import init_chat_model
from deepagents import create_deep_agent

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

model = init_chat_model(
    model="microsoft/Phi-3-mini-4k-instruct",
    model_provider="huggingface",
    temperature=0.7,
    max_tokens=1024,
)
agent = create_deep_agent(model=model)

import os
from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint
from deepagents import create_deep_agent

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

llm = HuggingFaceEndpoint(
    repo_id="microsoft/Phi-3-mini-4k-instruct",
    temperature=0.7,
    max_length=1024,
)
model = ChatHuggingFace(llm=llm)
agent = create_deep_agent(model=model)

Pass any supported model string, or an initialized model instance. For example:

pip install -U "langchain[deepseek]"

uv add "langchain[deepseek]"

from deepagents import create_deep_agent

agent = create_deep_agent(model="provider:model-name")

from deepagents import create_deep_agent
from langchain.chat_models import init_chat_model

model = init_chat_model("provider:model-name")
agent = create_deep_agent(model=model)

from langchain_<provider> import Chat<Provider>
# from langchain_deepseek import ChatDeepSeek

from deepagents import create_deep_agent

model = Chat<Provider>(model="model-name")
# model = ChatDeepSeek(model="deepseek-v4-pro")

agent = create_deep_agent(model=model)

Chat models automatically retry transient API failures (with exponential backoff). For defaults, limits, and code samples for tuning max_retries / timeout live on the LangChain Models page.

Tools

In addition to built-in tools for 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(
    model="google_genai:gemini-3.6-flash",
    tools=[internet_search],
)

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(
    model="openai:gpt-5.5",
    tools=[internet_search],
)

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(
    model="anthropic:claude-sonnet-4-6",
    tools=[internet_search],
)

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(
    model="openrouter:z-ai/glm-5.2",
    tools=[internet_search],
)

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(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    tools=[internet_search],
)

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(
    model="baseten:zai-org/GLM-5.2",
    tools=[internet_search],
)

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(
    model="ollama:north-mini-code-1.0",
    tools=[internet_search],
)

MCP tools

Deep Agents fully support Model Context Protocol (MCP) tools. You can load tools from any MCP server—databases, APIs, file systems, and more—and pass them directly to create_deep_agent.

Install LangChain with the mcp extra to connect to MCP servers:

pip install "langchain[mcp]"

import asyncio

from deepagents import create_deep_agent
from langchain.mcp import MCPAdapter


async def main():
    config = {"mcpServers": {"my_server": {"url": "http://localhost:8000/mcp"}}}
    async with MCPAdapter(config) as adapter:
        tools = await adapter.list_tools()
        agent = create_deep_agent(
            model="google_genai:gemini-3.6-flash",
            tools=tools,
        )
        await agent.ainvoke(
            {
                "messages": [
                    {"role": "user", "content": "Use the MCP server to help me."}
                ]
            },
            config={"configurable": {"thread_id": "1"}},
        )

import asyncio

from deepagents import create_deep_agent
from langchain.mcp import MCPAdapter


async def main():
    config = {"mcpServers": {"my_server": {"url": "http://localhost:8000/mcp"}}}
    async with MCPAdapter(config) as adapter:
        tools = await adapter.list_tools()
        agent = create_deep_agent(
            model="openai:gpt-5.5",
            tools=tools,
        )
        await agent.ainvoke(
            {
                "messages": [
                    {"role": "user", "content": "Use the MCP server to help me."}
                ]
            },
            config={"configurable": {"thread_id": "1"}},
        )

import asyncio

from deepagents import create_deep_agent
from langchain.mcp import MCPAdapter


async def main():
    config = {"mcpServers": {"my_server": {"url": "http://localhost:8000/mcp"}}}
    async with MCPAdapter(config) as adapter:
        tools = await adapter.list_tools()
        agent = create_deep_agent(
            model="anthropic:claude-sonnet-4-6",
            tools=tools,
        )
        await agent.ainvoke(
            {
                "messages": [
                    {"role": "user", "content": "Use the MCP server to help me."}
                ]
            },
            config={"configurable": {"thread_id": "1"}},
        )

import asyncio

from deepagents import create_deep_agent
from langchain.mcp import MCPAdapter


async def main():
    config = {"mcpServers": {"my_server": {"url": "http://localhost:8000/mcp"}}}
    async with MCPAdapter(config) as adapter:
        tools = await adapter.list_tools()
        agent = create_deep_agent(
            model="openrouter:z-ai/glm-5.2",
            tools=tools,
        )
        await agent.ainvoke(
            {
                "messages": [
                    {"role": "user", "content": "Use the MCP server to help me."}
                ]
            },
            config={"configurable": {"thread_id": "1"}},
        )

import asyncio

from deepagents import create_deep_agent
from langchain.mcp import MCPAdapter


async def main():
    config = {"mcpServers": {"my_server": {"url": "http://localhost:8000/mcp"}}}
    async with MCPAdapter(config) as adapter:
        tools = await adapter.list_tools()
        agent = create_deep_agent(
            model="fireworks:accounts/fireworks/models/glm-5p2",
            tools=tools,
        )
        await agent.ainvoke(
            {
                "messages": [
                    {"role": "user", "content": "Use the MCP server to help me."}
                ]
            },
            config={"configurable": {"thread_id": "1"}},
        )

import asyncio

from deepagents import create_deep_agent
from langchain.mcp import MCPAdapter


async def main():
    config = {"mcpServers": {"my_server": {"url": "http://localhost:8000/mcp"}}}
    async with MCPAdapter(config) as adapter:
        tools = await adapter.list_tools()
        agent = create_deep_agent(
            model="baseten:zai-org/GLM-5.2",
            tools=tools,
        )
        await agent.ainvoke(
            {
                "messages": [
                    {"role": "user", "content": "Use the MCP server to help me."}
                ]
            },
            config={"configurable": {"thread_id": "1"}},
        )

import asyncio

from deepagents import create_deep_agent
from langchain.mcp import MCPAdapter


async def main():
    config = {"mcpServers": {"my_server": {"url": "http://localhost:8000/mcp"}}}
    async with MCPAdapter(config) as adapter:
        tools = await adapter.list_tools()
        agent = create_deep_agent(
            model="ollama:north-mini-code-1.0",
            tools=tools,
        )
        await agent.ainvoke(
            {
                "messages": [
                    {"role": "user", "content": "Use the MCP server to help me."}
                ]
            },
            config={"configurable": {"thread_id": "1"}},
        )

For detailed configuration options including stdio servers, OAuth authentication, tool filtering, and stateful sessions, see the full MCP guide.

System prompt

Pass system_prompt= to give the agent your own instructions:

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(
    model="google_genai:gemini-3.6-flash",
    system_prompt=research_instructions,
)

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(
    model="openai:gpt-5.5",
    system_prompt=research_instructions,
)

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(
    model="anthropic:claude-sonnet-4-6",
    system_prompt=research_instructions,
)

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(
    model="openrouter:z-ai/glm-5.2",
    system_prompt=research_instructions,
)

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(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    system_prompt=research_instructions,
)

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(
    model="baseten:zai-org/GLM-5.2",
    system_prompt=research_instructions,
)

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(
    model="ollama:north-mini-code-1.0",
    system_prompt=research_instructions,
)

Besides a string, the main agent also accepts a SystemMessage with structured content blocks; Deep Agents preserve those blocks (subagent dictionary specs remain strings).

Subagent prompts

Declarative subagents resolve profile overlays against their own model, then apply the resolved profile’s base_system_prompt / system_prompt_suffix to the subagent’s authored system_prompt. A profile that ships only a system_prompt_suffix (the common case for built-in Anthropic / OpenAI profiles) appends to the authored prompt. A profile that sets base_system_prompt replaces it outright.

General-purpose subagent prompt

The auto-added general-purpose subagent resolves its base prompt as general_purpose_subagent.system_prompt (if set) -> HarnessProfile.base_system_prompt (if set) -> SDK general-purpose default, with the profile suffix layered on top. When both override fields are set, the general-purpose-specific one wins so a caller tuning both fields never sees their GP override silently dropped:

from deepagents import (
    GeneralPurposeSubagentProfile,
    HarnessProfile,
    register_harness_profile,
)

register_harness_profile(
    "anthropic",
    HarnessProfile(
        base_system_prompt="You are ACME's support orchestrator.",  # main agent
        general_purpose_subagent=GeneralPurposeSubagentProfile(
            system_prompt="You are a research subagent. Cite sources.",  # GP subagent
        ),
        system_prompt_suffix="Always think step by step.",
    ),
)

Stack	Final system prompt
Main agent	`"You are ACME's support orchestrator." + SUFFIX`
GP subagent	`"You are a research subagent. Cite sources." + SUFFIX`

Middleware

Deep Agents support any middleware, including the built-in middleware listed below, prebuilt middleware from LangChain, provider-specific middleware, and custom middleware you write yourself. Pass middleware to the middleware argument of create_deep_agent. Each instance is merged into the Deep Agents stack by matching its .name against built-in entries already in the stack: a match replaces that instance in place, and anything that does not match is inserted after PatchToolCallsMiddleware. See Override a default middleware instance.

Deep Agents stack

create_deep_agent builds middleware in a fixed order. The bare stack is what you get with only a model. The full stack is the complete assembly order, including slots that appear only when you pass optional arguments or when the resolved harness profile contributes them.

Bare stack

With only a model (no other optional arguments), the main agent typically includes:

FilesystemMiddleware
SubAgentMiddleware (because the general-purpose subagent is auto-added unless a harness profile disables it)
SummarizationMiddleware
PatchToolCallsMiddleware
Prompt caching middleware (always registered; each entry no-ops on models it does not support)
Harness profile extras and excluded-tool filtering, if the resolved model profile defines them

Full stack

From first to last:

SkillsMiddleware: Only when you pass skills. Injected before filesystem middleware so skill metadata is available before file tools run.
FilesystemMiddleware: Handles file system operations such as reading, writing, and navigating directories. When you pass permissions, filesystem permissions enforcement is included here so it can evaluate every tool the agent might call.
SubAgentMiddleware: Only when at least one synchronous subagent is available. Spawns and coordinates subagents for delegating tasks. Included in the bare stack because the general-purpose subagent is auto-added by default; omit it by disabling that subagent and passing no synchronous subagents. See Running without subagents.
SummarizationMiddleware: Condenses message history to stay within context limits when conversations grow long (via create_summarization_middleware).
PatchToolCallsMiddleware: Repairs dangling tool calls in message history when a run resumes after an interruption or receives malformed tool-call arguments. Runs before Anthropic prompt caching and the tail stack below.
AsyncSubAgentMiddleware: Only when you configure async subagents.
Your middleware argument: Optional middleware you pass as the middleware argument is merged after Patch but before the rest of the stack. An instance whose .name matches one of the built-in entries above replaces that instance in place instead of duplicating it; anything else lands here. See Override a default middleware instance.
Harness profile extras: Provider-specific middleware from the resolved model profile, if any.
Excluded-tool filtering: When the harness profile lists excluded tools, middleware removes those tools from the agent.
Prompt caching (AnthropicPromptCachingMiddleware and BedrockPromptCachingMiddleware): Both are always registered and run after Patch and after your middleware so the cached prefix matches what is actually sent to the model. Each no-ops on models it does not support (unsupported_model_behavior="ignore"), so the Anthropic middleware applies on Anthropic models and the Bedrock middleware on AWS Bedrock models with cache support.
MemoryMiddleware: Only when you pass memory.
MemoryMiddleware is placed after profile extras and the prompt caching middleware so updates to injected memory are less likely to invalidate the cache prefix. The same ordering concern is called out in the create_deep_agent implementation comments.
HumanInTheLoopMiddleware: Only when you pass interrupt_on. Pauses for human approval or input at configured tool calls.

Synchronous subagent stack

The built-in general-purpose subagent and each declarative synchronous SubAgent graph use a stack that create_deep_agent builds in code. It matches the main agent in broad shape (filesystem, summarization, Patch, profile extras, Anthropic and Bedrock caching, optional permissions) but differs in two ways:

Skills run after PatchToolCallsMiddleware on these inner agents (on the main agent, skills run before filesystem middleware when skills is set).
There is no SubAgentMiddleware inside a subagent graph (only the parent agent exposes the task tool).

When a declarative subagent sets interrupt_on, that value is forwarded to create_agent for the subagent, which wires up human-in-the-loop handling for the configured tool calls.

Prebuilt middleware

LangChain exposes additional prebuilt middleware that let you add-on various features, such as retries, fallbacks, or PII detection. See Prebuilt middleware for more. The deepagents library also exposes create_summarization_tool_middleware, enabling agents to trigger summarization at opportune times—such as between tasks—instead of at fixed token intervals. For more detail, see Summarization.

Provider-specific middleware

For provider-specific middleware that is optimized for specific LLM providers, see Middleware integrations.

Custom middleware

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

from langchain.agents.middleware import wrap_tool_call
from langchain.tools import tool
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(
    model="google_genai:gemini-3.6-flash",
    tools=[get_weather],
    middleware=[log_tool_calls],
)

from langchain.agents.middleware import wrap_tool_call
from langchain.tools import tool
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(
    model="openai:gpt-5.5",
    tools=[get_weather],
    middleware=[log_tool_calls],
)

from langchain.agents.middleware import wrap_tool_call
from langchain.tools import tool
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(
    model="anthropic:claude-sonnet-4-6",
    tools=[get_weather],
    middleware=[log_tool_calls],
)

from langchain.agents.middleware import wrap_tool_call
from langchain.tools import tool
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(
    model="openrouter:z-ai/glm-5.2",
    tools=[get_weather],
    middleware=[log_tool_calls],
)

from langchain.agents.middleware import wrap_tool_call
from langchain.tools import tool
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(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    tools=[get_weather],
    middleware=[log_tool_calls],
)

from langchain.agents.middleware import wrap_tool_call
from langchain.tools import tool
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(
    model="baseten:zai-org/GLM-5.2",
    tools=[get_weather],
    middleware=[log_tool_calls],
)

from langchain.agents.middleware import wrap_tool_call
from langchain.tools import tool
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(
    model="ollama:north-mini-code-1.0",
    tools=[get_weather],
    middleware=[log_tool_calls],
)

Do not mutate attributes after initializationIf you need to track values across hook invocations (for example, counters or accumulated data), use graph state. Graph state is scoped to a thread by design, so updates are safe under concurrency.Do this:

from langchain.agents.middleware import AgentMiddleware


class CustomMiddleware(AgentMiddleware):
    def __init__(self):
        pass

    def before_agent(self, state, runtime):
        return {"x": state.get("x", 0) + 1}  # Update graph state instead

Do not do this:

class CustomMiddlewareBad(AgentMiddleware):
    def __init__(self):
        self.x = 1

    def before_agent(self, state, runtime):
        self.x += 1  # Mutation causes race conditions

Mutation in place, such as modifying self.x in before_agent or changing other shared values in hooks, can lead to subtle bugs and race conditions because many operations run concurrently (subagents, parallel tools, and parallel invocations on different threads).For full details on extending state with custom properties, see Custom middleware - Custom state schema.If you must use mutation in custom middleware, consider what happens when subagents, parallel tools, or concurrent agent invocations run at the same time.

Override a default middleware instance

Overriding a default middleware by matching .name requires deepagents>=0.7.

Pass a middleware instance whose .name matches an entry in the Deep Agents stack, such as SummarizationMiddleware, to replace that built-in instance in place instead of appending a duplicate. Any middleware you pass whose .name does not match a built-in entry is not replaced, it lands after the last core middleware entry and before the profile, prompt-caching, and memory. See Full stack for the complete ordering.

from deepagents import create_deep_agent
from deepagents.backends import StateBackend
from deepagents.middleware import SummarizationMiddleware

backend = StateBackend()
model = "openai:gpt-5.5"

custom_summarization = SummarizationMiddleware(
    model=model,
    backend=backend,
    summary_prompt="Your custom summary prompt here.",
)

agent = create_deep_agent(
    model=model,
    middleware=[custom_summarization],  # replaces the default SummarizationMiddleware
)

An override replaces the default middleware instance, it is not merged with it. That means your replacement must be fully configured with any settings it needs. This is especially important for FilesystemMiddleware: if you override it, you must pass the backend (and permissions, if applicable) directly to your custom instance, since it won’t inherit the backend= and permissions= passed to create_deep_agent(). To restrict the available filesystem tools, pass a tools allowlist to your custom FilesystemMiddleware instance; see Virtual filesystem access for the “Restricting filesystem tools” example.

The general-purpose subagent, which Deep Agents adds automatically, inherits overrides for its default middleware from the main agent, without carrying over middleware that’s specific to the main agent. Declarative subagents defined via subagents= do not inherit the main agent’s middleware customization. Pass the override directly in that subagent’s own middleware field to apply it there; that field is matched against the synchronous subagent stack, the same way middleware= is matched against the main agent’s.

Examples

Adjust when summarization triggers

Override SummarizationMiddleware with custom trigger and keep thresholds to compact conversation history earlier or later than the default, and control how many recent messages survive each compaction.

from deepagents import create_deep_agent
from deepagents.backends import StateBackend
from deepagents.middleware import SummarizationMiddleware

backend = StateBackend()
model = "anthropic:claude-sonnet-4-6"

agent = create_deep_agent(
    model=model,
    middleware=[
        SummarizationMiddleware(
            model=model,
            backend=backend,
            trigger=("tokens", 100000),  # summarize once the conversation exceeds 100k tokens
            keep=("messages", 20),  # keep the most recent 20 messages verbatim
        ),
    ],
)

trigger also accepts ("fraction", ...) for a percentage of the model’s context window, and a list of thresholds combines them with OR semantics. See the SummarizationMiddleware reference for the full set of options.

Update the prompt cache TTL

Override AnthropicPromptCachingMiddleware to extend the cache lifetime beyond the default 5m TTL, useful for agents with long gaps between turns. See Prompt caching for how caching is applied by default.

from deepagents import create_deep_agent
from langchain_anthropic.middleware import AnthropicPromptCachingMiddleware

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    middleware=[
        AnthropicPromptCachingMiddleware(ttl="1h"),  # replaces the default 5m TTL
    ],
)

Restrict the enabled filesystem tools

The tools allowlist on FilesystemMiddleware requires deepagents>=0.7.

Override FilesystemMiddleware with a tools allowlist to expose only a subset of the filesystem tools to the model, instead of the full default set.

from deepagents import create_deep_agent
from deepagents.backends import StateBackend
from deepagents.middleware import FilesystemMiddleware

backend = StateBackend()

# Read-only agent: write_file, edit_file, delete, and execute are never shown
agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    backend=backend,
    middleware=[
        FilesystemMiddleware(backend=backend, tools=["read_file", "ls", "glob", "grep"]),
    ],
)

See Restricting filesystem tools for more details.

Customize how the skill catalog appears in the system prompt

Override SkillsMiddleware with a custom system_prompt= template to control how the auto-generated skill catalog is framed — for example, to add surrounding context, reorder sections, or place routing hints (priorities, category bias) in the same block as the catalog. The template must include the {skills_locations}, {skills_list}, and {skills_load_warnings} slots, which the middleware substitutes on every turn — so the catalog stays in sync automatically as skills are added, renamed, or removed.The example below places routing hints alongside the catalog:

from deepagents import create_deep_agent
from deepagents.backends.filesystem import FilesystemBackend
from deepagents.middleware.skills import SkillsMiddleware

backend = FilesystemBackend(root_dir="/path/to/skills")

custom_skills_prompt = """## Skills

Routing hints:
- For research topics → prefer arxiv-search first
- For general questions → use web-research
- For LangGraph documentation → langgraph-docs

{skills_locations}

{skills_list}

{skills_load_warnings}
"""

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    middleware=[
        SkillsMiddleware(
            backend=backend,
            sources=["/path/to/skills"],
            system_prompt=custom_skills_prompt,
        ),
    ],
)

Do not also pass skills= to create_deep_agent in this case: the override instance already owns backend and sources. Any missing slot ({skills_locations}, {skills_list}, {skills_load_warnings}) raises ValueError at construction time.

Suppress the auto-generated skill catalog

Override SkillsMiddleware with system_prompt=None to load skills without appending a skills section to the system prompt at all. Skills remain in state["skills_metadata"] and skill files stay reachable through the filesystem tools, so callers who prefer to write their own description block (for example, a compact hand-written routing summary) in create_deep_agent(system_prompt=...) can add exactly the guidance they need without the built-in one.

from deepagents import create_deep_agent
from deepagents.backends.filesystem import FilesystemBackend
from deepagents.middleware.skills import SkillsMiddleware

backend = FilesystemBackend(root_dir="/path/to/skills")

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    system_prompt="""You are a research assistant.

Skills (read the SKILL.md file when relevant):
- /path/to/skills/arxiv-search/SKILL.md — papers
- /path/to/skills/web-research/SKILL.md — general web lookups
- /path/to/skills/langgraph-docs/SKILL.md — LangGraph documentation
""",
    middleware=[
        SkillsMiddleware(
            backend=backend,
            sources=["/path/to/skills"],
            system_prompt=None,
        ),
    ],
)

Skill names, paths, and any hand-written hints in create_deep_agent’s system_prompt are the caller’s responsibility to keep in sync when skills change.

Interpreters

Use interpreters to add an eval tool that runs JavaScript in a scoped QuickJS runtime. Interpreters are useful when the agent needs to compose tools programmatically, batch work, handle errors in code, or transform structured data without a full shell environment.

from deepagents import create_deep_agent
from langchain_quickjs import CodeInterpreterMiddleware

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    middleware=[CodeInterpreterMiddleware()],
)

from deepagents import create_deep_agent
from langchain_quickjs import CodeInterpreterMiddleware

agent = create_deep_agent(
    model="openai:gpt-5.5",
    middleware=[CodeInterpreterMiddleware()],
)

from deepagents import create_deep_agent
from langchain_quickjs import CodeInterpreterMiddleware

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    middleware=[CodeInterpreterMiddleware()],
)

from deepagents import create_deep_agent
from langchain_quickjs import CodeInterpreterMiddleware

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    middleware=[CodeInterpreterMiddleware()],
)

from deepagents import create_deep_agent
from langchain_quickjs import CodeInterpreterMiddleware

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    middleware=[CodeInterpreterMiddleware()],
)

from deepagents import create_deep_agent
from langchain_quickjs import CodeInterpreterMiddleware

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    middleware=[CodeInterpreterMiddleware()],
)

from deepagents import create_deep_agent
from langchain_quickjs import CodeInterpreterMiddleware

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    middleware=[CodeInterpreterMiddleware()],
)

For setup, programmatic tool calling, subagent orchestration, and limits, see Interpreters.

Subagents

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

import os
from typing import Literal

from deepagents import create_deep_agent
from tavily import TavilyClient

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-5.5",  # Optional override, defaults to main agent model
}
subagents = [research_subagent]

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    subagents=subagents,
)

For more information, see Subagents.

Backends

Tools for a deep agent 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.

A thread-scoped filesystem backend stored in langgraph state.Files persist across turns within a thread (via your checkpointer) and are not shared across threads.

from deepagents import create_deep_agent
from deepagents.backends import StateBackend

# By default we provide a StateBackend
agent = create_deep_agent(model="google_genai:gemini-3.6-flash")

# Under the hood, it looks like
agent2 = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=StateBackend(),
)

from deepagents import create_deep_agent
from deepagents.backends import StateBackend

# By default we provide a StateBackend
agent = create_deep_agent(model="openai:gpt-5.5")

# Under the hood, it looks like
agent2 = create_deep_agent(
    model="openai:gpt-5.5",
    backend=StateBackend(),
)

from deepagents import create_deep_agent
from deepagents.backends import StateBackend

# By default we provide a StateBackend
agent = create_deep_agent(model="anthropic:claude-sonnet-4-6")

# Under the hood, it looks like
agent2 = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    backend=StateBackend(),
)

from deepagents import create_deep_agent
from deepagents.backends import StateBackend

# By default we provide a StateBackend
agent = create_deep_agent(model="openrouter:z-ai/glm-5.2")

# Under the hood, it looks like
agent2 = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    backend=StateBackend(),
)

from deepagents import create_deep_agent
from deepagents.backends import StateBackend

# By default we provide a StateBackend
agent = create_deep_agent(model="fireworks:accounts/fireworks/models/glm-5p2")

# Under the hood, it looks like
agent2 = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=StateBackend(),
)

from deepagents import create_deep_agent
from deepagents.backends import StateBackend

# By default we provide a StateBackend
agent = create_deep_agent(model="baseten:zai-org/GLM-5.2")

# Under the hood, it looks like
agent2 = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    backend=StateBackend(),
)

from deepagents import create_deep_agent
from deepagents.backends import StateBackend

# By default we provide a StateBackend
agent = create_deep_agent(model="ollama:north-mini-code-1.0")

# Under the hood, it looks like
agent2 = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    backend=StateBackend(),
)

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 import create_deep_agent
from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=FilesystemBackend(root_dir=".", virtual_mode=True),
)

from deepagents import create_deep_agent
from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    model="openai:gpt-5.5",
    backend=FilesystemBackend(root_dir=".", virtual_mode=True),
)

from deepagents import create_deep_agent
from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    backend=FilesystemBackend(root_dir=".", virtual_mode=True),
)

from deepagents import create_deep_agent
from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    backend=FilesystemBackend(root_dir=".", virtual_mode=True),
)

from deepagents import create_deep_agent
from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=FilesystemBackend(root_dir=".", virtual_mode=True),
)

from deepagents import create_deep_agent
from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    backend=FilesystemBackend(root_dir=".", virtual_mode=True),
)

from deepagents import create_deep_agent
from deepagents.backends import FilesystemBackend

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    backend=FilesystemBackend(root_dir=".", virtual_mode=True),
)

Wrap FilesystemBackend in a CompositeBackend to prevent internal agent data (offloaded tool results, conversation history) from being written to disk alongside your project files. See the recommended pattern.

A filesystem with shell execution directly on the host. Provides filesystem tools plus the execute tool for running commands.

This backend grants agents direct filesystem read/write access and unrestricted shell execution on your host. Use with extreme caution and only in appropriate environments. For more information, see LocalShellBackend.

from deepagents import create_deep_agent
from deepagents.backends import LocalShellBackend

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=LocalShellBackend(root_dir=".", virtual_mode=True, env={"PATH": "/usr/bin:/bin"}),
)

from deepagents import create_deep_agent
from deepagents.backends import LocalShellBackend

agent = create_deep_agent(
    model="openai:gpt-5.5",
    backend=LocalShellBackend(root_dir=".", virtual_mode=True, env={"PATH": "/usr/bin:/bin"}),
)

from deepagents import create_deep_agent
from deepagents.backends import LocalShellBackend

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    backend=LocalShellBackend(root_dir=".", virtual_mode=True, env={"PATH": "/usr/bin:/bin"}),
)

from deepagents import create_deep_agent
from deepagents.backends import LocalShellBackend

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    backend=LocalShellBackend(root_dir=".", virtual_mode=True, env={"PATH": "/usr/bin:/bin"}),
)

from deepagents import create_deep_agent
from deepagents.backends import LocalShellBackend

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=LocalShellBackend(root_dir=".", virtual_mode=True, env={"PATH": "/usr/bin:/bin"}),
)

from deepagents import create_deep_agent
from deepagents.backends import LocalShellBackend

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    backend=LocalShellBackend(root_dir=".", virtual_mode=True, env={"PATH": "/usr/bin:/bin"}),
)

from deepagents import create_deep_agent
from deepagents.backends import LocalShellBackend

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    backend=LocalShellBackend(root_dir=".", virtual_mode=True, env={"PATH": "/usr/bin:/bin"}),
)

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

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

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=StoreBackend(
        namespace=lambda rt: (rt.server_info.user.identity,),
    ),
    store=InMemoryStore(),  # Good for local dev; omit for LangSmith Deployment
)

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

agent = create_deep_agent(
    model="openai:gpt-5.5",
    backend=StoreBackend(
        namespace=lambda rt: (rt.server_info.user.identity,),
    ),
    store=InMemoryStore(),  # Good for local dev; omit for LangSmith Deployment
)

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

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    backend=StoreBackend(
        namespace=lambda rt: (rt.server_info.user.identity,),
    ),
    store=InMemoryStore(),  # Good for local dev; omit for LangSmith Deployment
)

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

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    backend=StoreBackend(
        namespace=lambda rt: (rt.server_info.user.identity,),
    ),
    store=InMemoryStore(),  # Good for local dev; omit for LangSmith Deployment
)

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

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=StoreBackend(
        namespace=lambda rt: (rt.server_info.user.identity,),
    ),
    store=InMemoryStore(),  # Good for local dev; omit for LangSmith Deployment
)

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

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    backend=StoreBackend(
        namespace=lambda rt: (rt.server_info.user.identity,),
    ),
    store=InMemoryStore(),  # Good for local dev; omit for LangSmith Deployment
)

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

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    backend=StoreBackend(
        namespace=lambda rt: (rt.server_info.user.identity,),
    ),
    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.

The namespace parameter controls data isolation. For multi-user deployments, always set a namespace factory to isolate data per user or tenant.

Durable filesystem storage in a LangSmith Hub repo.

from deepagents import create_deep_agent
from deepagents.backends import ContextHubBackend

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=ContextHubBackend("my-agent"),
)

from deepagents import create_deep_agent
from deepagents.backends import ContextHubBackend

agent = create_deep_agent(
    model="openai:gpt-5.5",
    backend=ContextHubBackend("my-agent"),
)

from deepagents import create_deep_agent
from deepagents.backends import ContextHubBackend

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    backend=ContextHubBackend("my-agent"),
)

from deepagents import create_deep_agent
from deepagents.backends import ContextHubBackend

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    backend=ContextHubBackend("my-agent"),
)

from deepagents import create_deep_agent
from deepagents.backends import ContextHubBackend

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=ContextHubBackend("my-agent"),
)

from deepagents import create_deep_agent
from deepagents.backends import ContextHubBackend

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    backend=ContextHubBackend("my-agent"),
)

from deepagents import create_deep_agent
from deepagents.backends import ContextHubBackend

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    backend=ContextHubBackend("my-agent"),
)

For more details, see ContextHubBackend.

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

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=CompositeBackend(
        default=StateBackend(),
        routes={
            "/memories/": StoreBackend(namespace=lambda _rt: ("memories",)),
        },
    ),
    store=InMemoryStore(),  # Store passed to create_deep_agent, not backend
)

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

agent = create_deep_agent(
    model="openai:gpt-5.5",
    backend=CompositeBackend(
        default=StateBackend(),
        routes={
            "/memories/": StoreBackend(namespace=lambda _rt: ("memories",)),
        },
    ),
    store=InMemoryStore(),  # Store passed to create_deep_agent, not backend
)

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

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    backend=CompositeBackend(
        default=StateBackend(),
        routes={
            "/memories/": StoreBackend(namespace=lambda _rt: ("memories",)),
        },
    ),
    store=InMemoryStore(),  # Store passed to create_deep_agent, not backend
)

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

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    backend=CompositeBackend(
        default=StateBackend(),
        routes={
            "/memories/": StoreBackend(namespace=lambda _rt: ("memories",)),
        },
    ),
    store=InMemoryStore(),  # Store passed to create_deep_agent, not backend
)

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

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=CompositeBackend(
        default=StateBackend(),
        routes={
            "/memories/": StoreBackend(namespace=lambda _rt: ("memories",)),
        },
    ),
    store=InMemoryStore(),  # Store passed to create_deep_agent, not backend
)

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

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    backend=CompositeBackend(
        default=StateBackend(),
        routes={
            "/memories/": StoreBackend(namespace=lambda _rt: ("memories",)),
        },
    ),
    store=InMemoryStore(),  # Store passed to create_deep_agent, not backend
)

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

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    backend=CompositeBackend(
        default=StateBackend(),
        routes={
            "/memories/": StoreBackend(namespace=lambda _rt: ("memories",)),
        },
    ),
    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:

pip install "langsmith[sandbox]"

uv add "langsmith[sandbox]"

from deepagents import create_deep_agent
from deepagents.backends import LangSmithSandbox
from langchain_anthropic import ChatAnthropic
from langsmith.sandbox import SandboxClient

client = SandboxClient()
ls_sandbox = client.create_sandbox()
backend = LangSmithSandbox(sandbox=ls_sandbox)

agent = create_deep_agent(
    model=ChatAnthropic(model="claude-sonnet-4-6"),
    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:
    client.delete_sandbox(ls_sandbox.name)

pip install langchain-daytona

uv add langchain-daytona

from daytona import Daytona
from deepagents import create_deep_agent
from langchain_anthropic import ChatAnthropic
from langchain_daytona import DaytonaSandbox

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

agent = create_deep_agent(
    model=ChatAnthropic(model="claude-sonnet-4-6"),
    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:
    sandbox.stop()

pip install langchain-e2b

uv add langchain-e2b

from e2b import Sandbox
from deepagents import create_deep_agent
from langchain_anthropic import ChatAnthropic
from langchain_e2b import E2BSandbox

e2b_sandbox = Sandbox.create()
backend = E2BSandbox(sandbox=e2b_sandbox)

agent = create_deep_agent(
    model=ChatAnthropic(model="claude-sonnet-4-6"),
    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:
    e2b_sandbox.kill()

pip install langchain-modal

uv add langchain-modal

import modal
from deepagents import create_deep_agent
from langchain_anthropic import ChatAnthropic
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-4-6"),
    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:
    modal_sandbox.terminate()

pip install langchain-runloop

uv add langchain-runloop

import os

from deepagents import create_deep_agent
from langchain_anthropic import ChatAnthropic
from langchain_runloop import RunloopSandbox
from runloop_api_client import RunloopSDK

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-4-6"),
    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-vercel-sandbox

uv add langchain-vercel-sandbox

from deepagents import create_deep_agent
from langchain_anthropic import ChatAnthropic
from langchain_vercel_sandbox import VercelSandbox
from vercel.sandbox import Sandbox

sandbox = Sandbox.create(runtime="python3.13")
backend = VercelSandbox(sandbox=sandbox)

agent = create_deep_agent(
    model=ChatAnthropic(model="claude-sonnet-4-6"),
    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:
    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 remove_file(path: str) -> str:
    """Delete a file from the filesystem."""
    return f"Deleted {path}"


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


@tool
def notify_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="google_genai:gemini-3.6-flash",
    tools=[remove_file, fetch_file, notify_email],
    interrupt_on={
        "remove_file": True,  # Default: approve, edit, reject, respond
        "fetch_file": False,  # No interrupts needed
        "notify_email": {"allowed_decisions": ["approve", "reject"]},  # No editing
    },
    checkpointer=checkpointer,  # Required!
)

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


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


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


@tool
def notify_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="openai:gpt-5.5",
    tools=[remove_file, fetch_file, notify_email],
    interrupt_on={
        "remove_file": True,  # Default: approve, edit, reject, respond
        "fetch_file": False,  # No interrupts needed
        "notify_email": {"allowed_decisions": ["approve", "reject"]},  # No editing
    },
    checkpointer=checkpointer,  # Required!
)

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


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


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


@tool
def notify_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="anthropic:claude-sonnet-4-6",
    tools=[remove_file, fetch_file, notify_email],
    interrupt_on={
        "remove_file": True,  # Default: approve, edit, reject, respond
        "fetch_file": False,  # No interrupts needed
        "notify_email": {"allowed_decisions": ["approve", "reject"]},  # No editing
    },
    checkpointer=checkpointer,  # Required!
)

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


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


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


@tool
def notify_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="openrouter:z-ai/glm-5.2",
    tools=[remove_file, fetch_file, notify_email],
    interrupt_on={
        "remove_file": True,  # Default: approve, edit, reject, respond
        "fetch_file": False,  # No interrupts needed
        "notify_email": {"allowed_decisions": ["approve", "reject"]},  # No editing
    },
    checkpointer=checkpointer,  # Required!
)

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


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


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


@tool
def notify_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="fireworks:accounts/fireworks/models/glm-5p2",
    tools=[remove_file, fetch_file, notify_email],
    interrupt_on={
        "remove_file": True,  # Default: approve, edit, reject, respond
        "fetch_file": False,  # No interrupts needed
        "notify_email": {"allowed_decisions": ["approve", "reject"]},  # No editing
    },
    checkpointer=checkpointer,  # Required!
)

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


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


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


@tool
def notify_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="baseten:zai-org/GLM-5.2",
    tools=[remove_file, fetch_file, notify_email],
    interrupt_on={
        "remove_file": True,  # Default: approve, edit, reject, respond
        "fetch_file": False,  # No interrupts needed
        "notify_email": {"allowed_decisions": ["approve", "reject"]},  # No editing
    },
    checkpointer=checkpointer,  # Required!
)

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


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


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


@tool
def notify_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="ollama:north-mini-code-1.0",
    tools=[remove_file, fetch_file, notify_email],
    interrupt_on={
        "remove_file": True,  # Default: approve, edit, reject, respond
        "fetch_file": False,  # No interrupts needed
        "notify_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, 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 Agents 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 import StateBackend
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()
backend = StateBackend()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/code/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(
    model="google_genai:gemini-3.6-flash",
    backend=backend,
    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 StateBackend
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()
backend = StateBackend()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/code/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(
    model="openai:gpt-5.5",
    backend=backend,
    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 StateBackend
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()
backend = StateBackend()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/code/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(
    model="anthropic:claude-sonnet-4-6",
    backend=backend,
    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 StateBackend
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()
backend = StateBackend()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/code/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(
    model="openrouter:z-ai/glm-5.2",
    backend=backend,
    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 StateBackend
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()
backend = StateBackend()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/code/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(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=backend,
    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 StateBackend
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()
backend = StateBackend()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/code/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(
    model="baseten:zai-org/GLM-5.2",
    backend=backend,
    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 StateBackend
from deepagents.backends.utils import create_file_data
from langgraph.checkpoint.memory import MemorySaver

checkpointer = MemorySaver()
backend = StateBackend()

skill_url = "https://raw.githubusercontent.com/langchain-ai/deepagents/refs/heads/main/libs/code/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(
    model="ollama:north-mini-code-1.0",
    backend=backend,
    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 langgraph.store.memory import InMemoryStore

store = InMemoryStore()
backend = StoreBackend(
    namespace=lambda _rt: ("filesystem",),
    store=store,
)

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

backend.upload_files(
    [("/skills/langgraph-docs/SKILL.md", skill_content.encode("utf-8"))]
)

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=backend,
    store=store,
    skills=["/skills/"],
)

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

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

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

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

backend = FilesystemBackend(root_dir="/Users/user/{project}", virtual_mode=True)
backend.upload_files(
    [("/skills/langgraph-docs/SKILL.md", skill_content.encode("utf-8"))]
)

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    backend=backend,
    skills=["/skills/"],
    interrupt_on={
        "write_file": True,
        "read_file": False,
        "edit_file": True,
    },
    checkpointer=checkpointer,  # Required for filesystem operations!
)

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.

To generate a repository wiki that coding agents discover through AGENTS.md, see OpenWiki.

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(
    model="google_genai:gemini-3.6-flash",
    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.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(
    model="openai:gpt-5.5",
    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.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(
    model="anthropic:claude-sonnet-4-6",
    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.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(
    model="openrouter:z-ai/glm-5.2",
    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.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(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    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.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(
    model="baseten:zai-org/GLM-5.2",
    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.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(
    model="ollama:north-mini-code-1.0",
    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(
    model="google_genai:gemini-3.6-flash",
    backend=StoreBackend(namespace=lambda _rt: ("filesystem",)),
    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 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(
    model="openai:gpt-5.5",
    backend=StoreBackend(namespace=lambda _rt: ("filesystem",)),
    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 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(
    model="anthropic:claude-sonnet-4-6",
    backend=StoreBackend(namespace=lambda _rt: ("filesystem",)),
    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 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(
    model="openrouter:z-ai/glm-5.2",
    backend=StoreBackend(namespace=lambda _rt: ("filesystem",)),
    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 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(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    backend=StoreBackend(namespace=lambda _rt: ("filesystem",)),
    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 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(
    model="baseten:zai-org/GLM-5.2",
    backend=StoreBackend(namespace=lambda _rt: ("filesystem",)),
    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 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(
    model="ollama:north-mini-code-1.0",
    backend=StoreBackend(namespace=lambda _rt: ("filesystem",)),
    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 deepagents.backends import FilesystemBackend
from langgraph.checkpoint.memory import MemorySaver

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

agent = create_deep_agent(
    model="google_genai:gemini-3.6-flash",
    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!
)

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

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

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

agent = create_deep_agent(
    model="openai:gpt-5.5",
    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!
)

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

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

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

agent = create_deep_agent(
    model="anthropic:claude-sonnet-4-6",
    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!
)

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

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

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

agent = create_deep_agent(
    model="openrouter:z-ai/glm-5.2",
    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!
)

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

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

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

agent = create_deep_agent(
    model="fireworks:accounts/fireworks/models/glm-5p2",
    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!
)

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

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

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

agent = create_deep_agent(
    model="baseten:zai-org/GLM-5.2",
    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!
)

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

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

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

agent = create_deep_agent(
    model="ollama:north-mini-code-1.0",
    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!
)

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

Profiles

A harness profile is a reusable bundle of per-model configuration that create_deep_agent applies automatically when the matching model is selected. Profiles are the right tool when you want behaviour that follows the model—not the call site—such as a system prompt suffix tuned for Claude’s instruction style, tool descriptions rewritten for GPT, or extra middleware that only makes sense with a specific provider. A single profile can carry: a custom base system prompt (base_system_prompt), an appended suffix (system_prompt_suffix), tool description overrides, tools or middleware to exclude, additional middleware to inject, and edits to the auto-added general-purpose subagent.

from deepagents import HarnessProfile, register_harness_profile

# Append a system-prompt suffix whenever gpt-5.5 is selected.
register_harness_profile(
    "openai:gpt-5.5",
    HarnessProfile(system_prompt_suffix="Respond in under 100 words."),
)

See Profiles for registration keys, merge semantics, and plugin packaging. A narrower companion API, provider profiles, packages model-construction arguments (API keys, timeouts, retry settings) for a provider.

Structured output

Deep Agents support structured output. 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(
    model=model,
    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.'

View example trace

Open a public LangSmith run for this example.

For more information and examples, see response format.

Advanced

create_deep_agent pre-assembles a middleware stack on top of create_agent. To build a fully custom agent—choosing exactly which capabilities to include—see Configure the harness.

Connect these docs to Claude, VSCode, and more via MCP for real-time answers.

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Override a default middleware instance

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View example trace

Advanced

​Model

​Tools

​MCP tools

​System prompt

​Middleware

​Deep Agents stack

​Bare stack

​Full stack

​Synchronous subagent stack

​Prebuilt middleware

​Provider-specific middleware

​Custom middleware

​Override a default middleware instance

​Examples

​Interpreters

​Subagents

​Backends

​Sandboxes

​Human-in-the-loop

​Skills

​Memory

​Profiles

​Structured output

View example trace

​Advanced

Model

Tools

MCP tools

System prompt

Middleware

Deep Agents stack

Bare stack

Full stack

Synchronous subagent stack

Prebuilt middleware

Provider-specific middleware

Custom middleware

Override a default middleware instance

Examples

Interpreters

Subagents

Backends

Sandboxes

Human-in-the-loop

Skills

Memory

Profiles

Structured output

Advanced