composiohq__composio/python/providers/langgraph/README.md

# composio-langgraph

Adapts Composio tools to LangChain's `StructuredTool` format for use in LangGraph agents and graph workflows, giving them access to 1000+ apps through a single Composio session.

## Installation

```bash
pip install composio composio-langgraph langgraph langchain langchain-openai
```

Set `COMPOSIO_API_KEY` (get one from [dashboard.composio.dev/settings](https://dashboard.composio.dev/settings)) and `OPENAI_API_KEY` in your environment:

```bash
export COMPOSIO_API_KEY=xxxxxxxxx
export OPENAI_API_KEY=xxxxxxxxx
```

## Quickstart

Create a session for your user, fetch its tools, and hand them to your agent. The wrapped tools also work anywhere LangGraph accepts LangChain tools, such as a `ToolNode` in a custom graph.

```python
from composio import Composio
from composio_langgraph import LanggraphProvider
from langchain.agents import create_agent
from langchain_openai import ChatOpenAI

composio = Composio(provider=LanggraphProvider())
llm = ChatOpenAI(model="gpt-5.2")

# Each session is scoped to one of your users
session = composio.create(user_id="user_123")
tools = session.tools()

agent = create_agent(tools=tools, model=llm)
result = agent.invoke(
    {
        "messages": [
            (
                "user",
                "Send an email to john@example.com with the subject 'Hello' and body 'Hello from Composio!'",
            )
        ]
    }
)

print(result["messages"][-1].content)
```

## Error handling

Each wrapped tool builds its `args_schema` from the Composio tool's input schema. When argument validation fails, the tool does not raise; it returns a structured result:

```python
{"successful": False, "error": "<validation message>", "data": None}
```

Check `successful` in tool output instead of wrapping calls in `try`/`except`.

## Links

- [LangChain provider docs](https://docs.composio.dev/docs/providers/langchain) (covers LangGraph)
- [Composio documentation](https://docs.composio.dev)