mcp-use__mcp-use/docs/python/changelog/1_4_0.mdx

---
title: "Version 1.4.0"
description: "Major upgrade to LangChain 1.0.0 with direct provider integrations"
icon: "sparkles"
og:image: "https://mcp-use.com/api/og/release?v=1.4.0"
---

<Card img="https://mcp-use.com/api/og/release?v=1.4.0" title="Release 1.4.0" href="https://github.com/mcp-use/mcp-use/releases/tag/python-v1.4.0">
  We've migrated to **LangChain 1.0.0**, unlocking better performance and simplified agent execution patterns, as well as direct provider integrations for OpenAI, Anthropic, and Google.
</Card>

## Major Changes

### LangChain 1.0.0 Migration

We've successfully migrated to **LangChain 1.0.0**, unlocking better performance and simplified agent execution patterns.

**Key improvements:**
- Upgraded from LangChain 0.3.27 → 1.0.0
- Simplified agent instantiation using `create_agent()`
- Reduced MCPAgent codebase by ~440 lines while adding functionality
- Enhanced internal agent loop handling

**Usage example:**

```python
from mcp_use import MCPAgent

agent = MCPAgent(config={"mcpServers": {...}})

# Run method now uses LangChain 1.0.0 internally
result = await agent.run("Your query")

# Stream method leverages create_agent() and astream()
async for chunk in agent.stream("Your query"):
    print(chunk)
```

### Provider Adapters

Direct integration adapters for major AI providers - **no MCPAgent required!**

Use MCP tools directly with your preferred provider's SDK:

<Tabs>
<Tab title="OpenAI">
```python
from openai import OpenAI
from mcp_use import MCPClient
from mcp_use.agents.adapters import OpenAIMCPAdapter

client = MCPClient(config={"mcpServers": {...}})

# Create adapter for OpenAI format
adapter = OpenAIMCPAdapter()
await adapter.create_all(client)

# Use with OpenAI SDK
openai = OpenAI()
response = openai.chat.completions.create(
    model="gpt-4o",
    messages=[{"role": "user", "content": "Find hotels in Trapani"}],
    tools=adapter.tools + adapter.resources + adapter.prompts
)

# Execute tool calls
for tool_call in response.choices[0].message.tool_calls:
    executor = adapter.tool_executors[tool_call.function.name]
    result = await executor(**json.loads(tool_call.function.arguments))
    content = adapter.parse_result(result)
```
</Tab>

<Tab title="Anthropic">
```python
from anthropic import Anthropic
from mcp_use import MCPClient
from mcp_use.agents.adapters import AnthropicMCPAdapter

client = MCPClient(config={"mcpServers": {...}})

# Create adapter for Anthropic format
adapter = AnthropicMCPAdapter()
await adapter.create_all(client)

# Use with Anthropic SDK
anthropic = Anthropic()
response = anthropic.messages.create(
    model="claude-sonnet-4-5",
    messages=[{"role": "user", "content": "Find hotels in Trapani"}],
    tools=adapter.tools + adapter.resources + adapter.prompts,
    max_tokens=1024
)

# Execute tool calls
for content in response.content:
    if content.type == "tool_use":
        executor = adapter.tool_executors[content.name]
        result = await executor(**content.input)
        parsed = adapter.parse_result(result)
```
</Tab>

<Tab title="Google">
```python
from google import genai
from google.genai import types
from mcp_use import MCPClient
from mcp_use.agents.adapters import GoogleMCPAdapter

client = MCPClient(config={"mcpServers": {...}})

# Create adapter for Google format
adapter = GoogleMCPAdapter()
await adapter.create_all(client)

# Use with Google SDK
gemini = genai.Client()
google_tools = [types.Tool(function_declarations=adapter.tools)]

response = gemini.models.generate_content(
    model="gemini-flash-lite-latest",
    contents=[types.Content(role="user", parts=[types.Part.from_text("Find hotels")])],
    config=types.GenerateContentConfig(tools=google_tools)
)

# Execute function calls
for function_call in response.function_calls:
    executor = adapter.tool_executors[function_call.name]
    result = await executor(**function_call.args)
    content = adapter.parse_result(result)
```
</Tab>
</Tabs>

**Available adapters:**
- `OpenAIMCPAdapter` - OpenAI & compatible APIs
- `AnthropicMCPAdapter` - Claude & Anthropic APIs
- `GoogleMCPAdapter` - Gemini & Google AI APIs
- `LangChainMCPAdapter` - LangChain integration (existing)

## Enhancements

### Agent Improvements
- **Dynamic tool updates**: Tools can now be refreshed during agent execution
- **Enhanced step tracking**: Better visibility into agent execution steps with middleware support
- **Streaming improvements**: More reliable streaming output with proper null checking
- **History filtering**: Automatic filtering of ToolMessage from conversation history
- **Remote mode delegation**: Query streaming properly delegated to remote agents

### Quality & Reliability
- Stricter streaming tests for better reliability
- Improved observability callback handling
- Better null checks for node output message extraction
- Fixed max_steps assignment issues

## Breaking Changes

None - all existing methods have been updated internally to use LangChain 1.0.0 while maintaining the same API.

### Staying on LangChain 0.3.x

If you need to remain on LangChain 0.3.x, pin `mcp-use` to version 1.3.13:

```bash
# Using pip
pip install mcp-use==1.3.13

# Using uv
uv pip install mcp-use==1.3.13
```

Or in your `requirements.txt` or `pyproject.toml`:

```toml
# requirements.txt
mcp-use==1.3.13

# pyproject.toml
[project]
dependencies = [
    "mcp-use==1.3.13",
]
```

Version 1.3.13 is the last release compatible with LangChain 0.3.27.

## Dependencies

```toml
langchain>=1.0.0
langchain-core>=1.0.0
```

## See Also

- [OpenAI Integration Guide](/python/integration/openai)
- [Anthropic Integration Guide](/python/integration/anthropic)
- [Google Integration Guide](/python/integration/google)
- [Agent Configuration](/python/agent/agent-configuration)