The Used Car Index
Server Details
Free NHTSA recalls, complaints and investigations per vehicle, recall alerts, dealer listing events.
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP · MCP 2025-11-25
- URL
TDQS
Scored across 3 tools
compare_vehicles and vehicle_risk both surface complaint/recall data, but one is explicitly for multi-vehicle comparison and the other for detailed single-vehicle risk, while listing_changes covers a distinct event stream. The descriptions clearly delineate scope and output, so agents can reliably select the right tool.
compare_vehicles uses a verb_noun pattern, while listing_changes and vehicle_risk are noun phrases, creating a mixed convention. All names are snake_case and readable, but the lack of a consistent verb_noun structure prevents a higher score.
Three tools is a well-scoped set for a specialized data service, each covering a substantial, non-overlapping capability. The count is within the ideal 3-15 range and no tool feels redundant.
The surface covers comparison, listing changes, and deep risk data, but lacks operations to search or list vehicles, retrieve current listings, or access pricing/market values. These gaps will force agents to rely on external sources for basic discovery and current market data.
Available Tools
4 toolscompare_vehiclesCompare vehiclesRead-onlyIdempotentInspect
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 explicitly unrated. Counts reflect source coverage; no recommendation, verdict or safety ranking. The free tier compares up to 2 vehicles per call, paid plans up to 5.
| Name | Required | Description | Default |
|---|---|---|---|
| vehicles | Yes |
listing_changesListing changesRead-onlyIdempotentInspect
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 photos or dealer-written text; delisted only means the listing was no longer observed, not that a sale completed. The free tier returns at most 10 events per call with no paging, paid plans up to 200 with cursors.
| Name | Required | Description | Default |
|---|---|---|---|
| vin | No | ||
| make | No | ||
| year | No | ||
| limit | No | ||
| model | No | ||
| since | No | ||
| until | No | ||
| cursor | No | ||
| event_type | No |
recall_changesRecall and investigation changesRead-onlyIdempotentInspect
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, complaint_count) or observed date. Each change has the NHTSA campaign or action number, the record date, a short summary and a source link. These are published records, not a prediction, safety rating or advice. The free tier returns at most 10 changes per call with no paging, paid plans up to 200 with cursors and a vehicle watchlist.
| Name | Required | Description | Default |
|---|---|---|---|
| make | No | ||
| type | No | ||
| year | No | ||
| limit | No | ||
| model | No | ||
| since | No | ||
| until | No | ||
| cursor | No |
vehicle_riskVehicle risk recordRead-onlyIdempotentInspect
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 coverage. Separately labeled Jev model tags (model years 2012 and newer; about 43 percent of all complaints are tagged) carry per-label counts, shares and model confidence, which is not accuracy. Spellings and aliases resolve to the stored vehicle. A zero is confirmed only when coverage_complete is true. These are observed records, not a prediction, safety rating, verdict, repair advice or an individual vehicle history.
| Name | Required | Description | Default |
|---|---|---|---|
| make | Yes | ||
| year | Yes | ||
| model | Yes |
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
1 tool update
- Added
recall_changes
3 tool updates
- First observed
compare_vehicles - First observed
listing_changes - First observed
vehicle_risk
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