Eugene Yurtsev 8734c05f64 feat(langchain_v1): tool retry middleware (#33503) ...

Adds `ToolRetryMiddleware` to automatically retry failed tool calls with
configurable exponential backoff, exception filtering, and error
handling.

## Example

```python
from langchain.agents import create_agent
from langchain.agents.middleware import ToolRetryMiddleware
from langchain_openai import ChatOpenAI

# Retry up to 3 times with exponential backoff
retry = ToolRetryMiddleware(
    max_retries=3,
    initial_delay=1.0,
    backoff_factor=2.0,
)

agent = create_agent(
    model=ChatOpenAI(model="gpt-4"),
    tools=[search_tool, database_tool],
    middleware=[retry],
)

# Tool failures are automatically retried
result = agent.invoke({"messages": [{"role": "user", "content": "Search for AI news"}]})
```

For advanced usage with specific exception handling:

```python
from requests.exceptions import Timeout, HTTPError

def should_retry(exc: Exception) -> bool:
    # Only retry on 5xx errors or timeouts
    if isinstance(exc, HTTPError):
        return 500 <= exc.response.status_code < 600
    return isinstance(exc, Timeout)

retry = ToolRetryMiddleware(
    max_retries=4,
    retry_on=should_retry,
    tools=["search_database"],  # Only apply to specific tools
)
```

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..

integration_tests

chore(langchain): add ruff rules D for langchain_v1 (#32808)

2025-09-03 15:26:17 -04:00

unit_tests

feat(langchain_v1): tool retry middleware (#33503)

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__init__.py

…