---
title: "Build a Classic Car Valuation Agent with MCP"
description: "A technical walkthrough for building an AI collector-car valuation workflow with Old Cars Data MCP tools, comparable sales, live auctions, bid history, and market stats."
url: "https://oldcarsdata.com/guides/build-classic-car-valuation-agent-mcp"
dateModified: "2026-06-19T00:00:00.000Z"
type: "technical-guide"
tags: ["MCP", "AI agent", "classic car valuation", "collector car API"]
---

# Build a Classic Car Valuation Agent with MCP

## Direct Answer

To build a classic car valuation agent with MCP, connect the agent to Old Cars Data, normalize make and model names, retrieve comparable completed sales, check live auction activity, inspect bid trails where available, and summarize market statistics with appraisal caveats.

## Workflow

| Step | MCP tool | Purpose |
|------|----------|---------|
| Normalize the vehicle | list_makes, list_models | Use canonical names before searching |
| Find comparable sales | search_auctions | Return completed listings, prices, statuses, and vehicle details |
| Check the live market | search_live_auctions | Compare current bidding against completed results |
| Inspect demand | get_auction_bids | Review bid progression where supported |
| Summarize the market | get_price_stats | Add median, range, trend, and volume context |

## MCP server

```json
{
  "mcpServers": {
    "oldcarsdata": {
      "type": "http",
      "url": "https://api.oldcarsdata.com/mcp"
    }
  }
}
```

## Agent policy

```text
You are a collector-car market research assistant.

When a user asks what a car is worth:
1. Use list_makes and list_models to normalize the make and model.
2. Use search_auctions to find comparable completed sales.
3. Use search_live_auctions to check current market activity when relevant.
4. Use get_auction_bids for supported listings when bid behavior matters.
5. Use get_price_stats for market-level context.
6. Explain confidence, caveats, and what a human should inspect next.

Do not call the result a formal appraisal.
```

## Related

- [MCP Setup Guide](/docs/mcp)
- [Classic Car Data for AI Agents](/use-cases/ai-agent-classic-car-data)
- [Classic Car Valuation API](/use-cases/classic-car-valuation-api)
- [Methodology](/methodology)

## Source Citations

- [Bring a Trailer](https://bringatrailer.com)
- [Cars & Bids](https://carsandbids.com)
- [Hagerty](https://hagerty.com)
- [PCAR Market](https://pcarmarket.com)
- [All Collector Cars](https://allcollectorcars.com)
- [Gooding & Co](https://goodingco.com)
- [RM Sotheby's](https://rmsothebys.com)

- [Data sources](https://oldcarsdata.com/data-sources)
- [Methodology](https://oldcarsdata.com/methodology)

## Provenance

Based on Old Cars Data coverage from Bring a Trailer, Cars & Bids, Hagerty, PCAR Market, All Collector Cars, Gooding & Co, RM Sotheby's. Data catalog freshness: 2026-06-19.