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The Used Car Index MCP server

Which MCP servers are The Used Car Index's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-25

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Whose server it is
  • Registry namecom.theusedcarindex/feedverified in the MCP registry

The registry name sits under theusedcarindex.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-25
  • Stateanswerschecked 2026-10-25
  • Tools4
  • Server calls itselfused-car-index
  • Server version1.1.0
  • Protocol version2025-06-18

On 2026-10-25 the server answered initialize and tools/list without a sign-in. First answer in 90 ms.

Should an agent connect itConnect it
  • Its tools do every use case we checked: look up recalls and complaints for a model year; compare up to five vehicles side by side.

Once connected

  • For "look up recalls and complaints for a model year", the likely first call is vehicle_risk.
  • For "compare up to five vehicles side by side", the likely first call is compare_vehicles.
  • Parameters are untyped or undescribed in 4 of 4 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 11, the first on 2026-10-25
  • INITE MCP score96 of 100answers 100 · does the job 100 · definitions 83 · context 100 · connects 100
  • What an agent can do with it2 of 2 use cases
  • Answered100% of days11 of 11 daily checks
  • Median first answer167 ms
  • Space in an agent's context≈ 1,087 tokensthe definitions of all its tools (4), which an agent carries on every turn
  • Tool definitionsB · 83 of 100
  • Typed results0 of 4 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 4 of 4

What an agent can do with it

  • can do · look up recalls and complaints for a model year
  • not sure · track daily listing price and mileage changes
  • can do · compare up to five vehicles side by side

Each of the product's use cases, put to Jev against this server's tool list: can an agent do it with these tools?

Worth a look

None of the five warning signs in these definitions.

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers4 tools · read 2026-10-25
  • vehicle_risk

    Look up the recorded risk facts for one make, model and model year: NHTSA complaint counts by system and subsystem, recalls, investigations, manufacturer communications, an optional verified complaints-per-100k-sold rate and source…

  • compare_vehicles

    Compare recorded facts for several vehicles side by side, with factual orderings by complaints, recalls and available verified complaints-per-100k-sold rates. Unknown vehicles come back with database suggestions and unrated vehicles stay…

  • listing_changes

    List observed dealer listing changes (new, price drop, relisted, delisted) with VIN, price, mileage, dates, source and link, filtered by vehicle, event type or date. Collector status separates an inactive feed from observed events. No…

  • recall_changes

    List new and updated NHTSA recalls, investigations and complaint-count changes that this service recorded from the daily NHTSA bulk-file comparison, newest first, filtered by make, model, model year, type (recall, investigation…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "feed": {
      "type": "http",
      "url": "https://api.theusedcarindex.com/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http theusedcarindex https://api.theusedcarindex.com/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://api.theusedcarindex.com/mcp as a custom connector in the settings.

OpenAPI spec

16 paths, read 2026-10-25. Open the spec ↗

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.