CXH AUTO: querying China car-price trends through MCP

I work in the automotive industry. I am opening a public beta of CXH AUTO (车小花) for China new- and used-car market prices and historical trends: a Skill and remote MCP connection focused on Chinese new- and used-car market quotations and available historical price trends.

The interesting engineering problem is not connecting a language model to a search endpoint. It is making sure that the number returned answers the buyer's actual question.

1. Wholesale, retail and guide prices are different observations

A dealer asking another dealer for a wholesale price is doing a different task from a consumer checking a retail listing. A manufacturer's guide price is different again. A price advertised with financing or trade-in conditions may also differ from an unconditional cash offer.

Our rule is to preserve the price category supplied by the observation. The platform's audience alone cannot establish that category. A seller's quote with unverified wholesale/retail semantics remains a seller's quote; a fixed markup should not turn it into another kind of price.

For an agent, this means the tool contract needs more than a number. It needs the configuration, region, quote or observation time, price category, and applicable conditions.

2. “No local match” is not “no market”

If the requested city has too few observations, a provincial reference can still be useful. The important part is keeping the scope visible: a provincial sample must not be relabelled as a quotation from the user's city.

We are developing a comparison view that keeps the used vehicle alongside new-car references. The selection should prefer an exact configuration, then explicitly described newer same-series alternatives. A similar name is not enough to assert that two trims have the same powertrain or that one is a verified successor.

This comparison must also preserve the original used-car query. Switching the displayed new-car reference should not silently change the used vehicle's year, mileage or city, or create another paid lookup just to rearrange data already returned.

3. A working web login does not prove the agent became a member

One failure mode during testing was an apparently completed login while the original agent connection still behaved as a guest. The acceptance test has to return to the same conversation, read the current access state, and continue the same vehicle query.

We are still improving this path in some clients. A successful HTTP connection, a rendered card and a paid membership are separate things to verify.

Try the public beta

The public repository contains only the Skill usage instructions and the public MCP connection address:

https://github.com/leo2026888/cxhauto-car-prices

CXH AUTO is the existing international brand of 车小花: https://cxhauto.com/. The price-query MCP uses the service address below; the brand website is a separate entry.

The official installation page is:

https://www.cxhcf.com/mcp/workbuddy

The remote endpoint uses Streamable HTTP:

https://clue.cxhcf.com/localCarBusinessIntranet/quotesWeb/mcp 

A sample request is: “Use CXH AUTO to look up recent quotes for a used 2023 BMW 530Li in Hangzhou. Separate wholesale from retail, and let me choose the trim.”

Installing the Skill provides instructions; the client still needs an MCP connection. Initial guest queries are limited, and actual allowance is reported by the service. Client compatibility, membership continuity, coverage and first-result latency are still being tested.

Public distribution is intentionally documentation-only. Application code, automation programs, credentials, server configuration and quotation data remain private.

Historical observations, interpolated points and future forecasts need different labels and validation. The interaction demo uses fictional data; it is not evidence of forecast accuracy. Listing quotations are not transaction prices or guaranteed inventory.

I would particularly welcome feedback from automotive developers and dealers: when you ask an agent for a car's price, which missing condition most often makes the answer unusable?