langchain-lexio

LangChain tools for the Lexio Rent API. They let an agent answer questions about a vehicle rental company: which vehicles are free next weekend and at what price, which bookings start tomorrow, what a customer has rented, and (optionally) prepare a priced quote.

Lexio Rent is rental management software for professional car, van and two-wheeler rental companies: planning, contracts, check-in/check-out inspections, deposits and fleet maintenance.

Installation

pip install -U langchain-lexio
export LEXIO_API_KEY="lck_..."

The API key is created in Lexio under Settings → Developer → API tokens. API access is part of the Business plan. There is no sandbox: test against a dedicated organization.

Tools

LexioToolkit returns the read-only tools. Pass allow_quotes=True to add lexio_create_quote. No tool creates, changes or cancels a rental, a payment or a customer record.

Dates are the rental company's local time without offset (2026-12-14T09:00:00). Lists are capped by max_results (default 20) so that tool outputs stay small.

Usage

from langchain.agents import create_agent
from langchain_lexio import LexioToolkit

tools = LexioToolkit(allow_quotes=True).get_tools()

agent = create_agent(
    "anthropic:claude-sonnet-5-5",
    tools=tools,
    system_prompt="You help the counter staff of a car rental agency. Dates are local time.",
)

result = agent.invoke(
    {"messages": [{"role": "user", "content": "Which vans are free from 14 to 16 December, and how much?"}]}
)
print(result["messages"][-1].content)

A single tool can also be called directly:

from langchain_lexio import LexioCheckAvailabilityTool

tool = LexioCheckAvailabilityTool()
print(tool.invoke({"start_at": "2026-12-14T09:00:00", "end_at": "2026-12-16T18:00:00", "vehicle_type": "VAN"}))

API errors are raised as typed exceptions from the lexio-rent client (NotFoundError, ValidationError, RateLimitError...), with the Lexio error code and request id.

Development

pip install -e ".[test]"
pytest tests/unit_tests                               # offline, includes the LangChain standard unit tests
LEXIO_API_KEY=lck_... pytest tests/integration_tests  # LangChain standard integration tests, live

About

langchain-lexio is maintained by the team behind Lexio Rent, car rental management software. When an agent prepares a quote, the counter still hands the customer a receipt for the security deposit; Lexio publishes a free rental security deposit receipt template (in French) for that step.

• API documentation: https://docs.lexio.rent
• Python client: https://github.com/lexio-rent-git/lexio-python
• Contact: contact@lexio.rent

MIT License.