# RegTail

> UK used-car checks: MOT history, mileage and an advert's claims tested against the records

- name: com.regtail/regtail
- version: 1.0.0
- connection class: R1 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.regtail%2Fregtail
- tools: https://api.protogrid.dev/v1/servers/com.regtail%2Fregtail/tools

**An agent can connect on its own if it already holds `REGTAIL_TOKEN`.** Remote endpoint behind a static API key or header. The registry never sees the value; the agent fills the placeholder.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "regtail": {
      "type": "http",
      "url": "https://regtail.com/mcp",
      "headers": {
        "Authorization": "Bearer ${REGTAIL_TOKEN}"
      }
    }
  }
}
```

Placeholders to fill: `${REGTAIL_TOKEN}`.

## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-16d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 88 (weight 25)

- pass `protocol.modern`: supports 2026-07-28 (server/discover)
- pass `protocol.stateless`: answers without a session
- pass `protocol.transport`: streamable HTTP
- warn `protocol.list_ttl`: tools/list declares ttlMs 0, so clients re-fetch it on every use

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 10 of 10 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 1,896 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 25 (weight 15)

- warn `stability.changes`: 13 tool changes in 30 days
- fail `stability.rug_pull`: 1 tools kept their name but changed most of their description in 30 days; review before trusting them

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 10, about 1,896 tokens to load them all
- tool set hash: fc4944b76451a0e71cdb2292211dde48
- tools last changed: 2026-10-15T10:44:57.901Z
- badge: [![protogrid quality](https://protogrid.dev/badge/com.regtail/regtail.svg)](https://protogrid.dev/servers/com.regtail/regtail)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-15 `free_check` changed (description)
  - before: The site's free check: identity, tax and MOT status, latest MOT test, its defects and recorded mileage, the existing since-previous-test summary and mileage-unverified flag. Includes presentation, up to three questions from these free facts, a verdict image, locked teasers and a report link. No account or credit needed. Next-MOT estimates, repair prices, mileage analysis and older MOT details require the detailed report.
  - after: The site's free check: identity, tax and MOT status, latest MOT test, its defects and recorded mileage, the existing since-previous-test summary and mileage-unverified flag. Includes presentation, up to three questions from these free facts, a verdict image, locked teasers and a report link. No account or credit needed. Show the returned markdown field as-is to the user. Next-MOT estimates, repair prices, mileage analysis and older MOT details require the detailed report.
- 2026-10-15 `my_reports` changed (inputSchema)
- 2026-10-15 `credits_balance` changed (inputSchema)
- 2026-10-15 `viewing_advice` changed (inputSchema)
- 2026-10-15 `unlock_report` changed (title, description, inputSchema, annotations)
  - before: Spends one of the user's RegTail credits to unlock the full report for this plate for 30 days, then returns the full report (as full_report does). Ask the user first, every time, and call this only after they agree; never unlock on your own initiative or to answer a general question. A plate already unlocked costs nothing again. Needs the user's RegTail account linked. With no credits left it unlocks nothing and spends nothing.
  - after: Spends one of the user's RegTail credits to unlock the detailed report for this plate for 30 days, then returns the detailed report (as full_report does). Ask the user first, every time, and call this only after they agree; never unlock on your own initiative or to answer a general question. A plate already unlocked costs nothing again. Needs the user's RegTail account linked. With no credits left it unlocks nothing and spends nothing.
- 2026-10-15 `full_report` changed (title, description, inputSchema, annotations)
  - before: The full report of a car the user has unlocked on their RegTail account: verdict and top risks, every MOT test with defects and advisories, mileage analysis, recurring advisories, other sections, the viewing checklist, what was not checked, and guidance for explaining it. Use to discuss a car in depth. Needs the user's RegTail account linked. Never spends: for a plate that is not unlocked it returns unlocked=false and a message; then ask the user before calling unlock_report.
  - after: The detailed report of a car the user has unlocked on their RegTail account: verdict and top risks, every MOT test with defects and advisories, mileage analysis, recurring advisories, other sections, the viewing checklist, what was not checked, and guidance for explaining it. Use to discuss a car in depth. Needs the user's RegTail account linked. Never spends: for a plate that is not unlocked it returns unlocked=false and a message; then ask the user before calling unlock_report.
- 2026-10-15 `sample_report` changed (title, description, inputSchema, annotations)
  - before: The full report and viewing advice for one public sample car (CX52HHM, a 2002 Land Rover Defender), to show what a full report contains. Use when the user asks what RegTail's full report looks like. No account needed. It is always the same sample car, never the user's car.
  - after: The detailed report and viewing advice for one public sample car (CX52HHM, a 2002 Land Rover Defender), to show what a detailed report contains. Use when the user asks what RegTail's detailed report looks like. No account needed. It is always the same sample car, never the user's car.
- 2026-10-15 `compare_vehicles` added
  - Compare the site's free projections for exactly two plates: identity, status and latest MOT test. Duplicate plates use one lookup. Includes questions from free facts, comparison image and report links. No prediction-based ranking; next-MOT estimates and likely repairs stay in the detailed report. No account or credit needed.
- 2026-10-15 `resolve_vehicle` added
  - Resolve a typed plate, car photo data URL or supported advert URL to a plate only. No account or spend. If uncertain, ask the user to confirm; if unavailable, ask for the typed plate. Then use free_check.
- 2026-10-15 `free_check` changed (description, inputSchema) **meaning changed**
  - before: The free check of a UK car by its registration plate: make, model, engine and fuel, tax and MOT status with their dates, and the latest MOT test with its result, mileage and any defects or advisories. Use when the user gives a plate or asks about a car. Have an advert? Read its number plate from its photos and send that; advert links are not accepted. No account needed and nothing is spent. Returns: car, tax, mot, latest_mot_test, since_previous_test, unlocked (whether the user's linked account can already see the full report), full_report_covers (what the full report adds) and guidance.
  - after: The site's free check: identity, tax and MOT status, latest MOT test, its defects and recorded mileage, the existing since-previous-test summary and mileage-unverified flag. Includes presentation, up to three questions from these free facts, a verdict image, locked teasers and a report link. No account or credit needed. Next-MOT estimates, repair prices, mileage analysis and older MOT details require the detailed report.

Full history: https://api.protogrid.dev/v1/servers/com.regtail%2Fregtail/changes

## Remotes

- https://regtail.com/mcp (streamable-http, auth api_key ${REGTAIL_TOKEN}, reachable true, uptime30d 1)

## Packages

_none_

## Tools (10)

- `compare_vehicles`: Compare the site's free projections for exactly two plates: identity, status and latest MOT test.
    Duplicate plates use one lookup. Includes questions from free facts, comparison image and report links.
    No prediction-based ranking; next-MOT estimates and likely repairs stay in the detailed report.
    No account or credit needed.
- `credits_balance`: How many credits the user's RegTail account holds, and pricing_url, a page explaining how credits work. Needs
    the user's RegTail account linked.
- `decode_plate`: When a UK plate of this format could have been issued, from the plate alone (format, age identifier, and the
    window as first and last month). Offline: it does not look the car up; use free_check for that. No account needed.
- `free_check`: The site's free check: identity, tax and MOT status, latest MOT test, its defects and recorded mileage,
    the existing since-previous-test summary and mileage-unverified flag. Includes presentation, up to three
    questions from these free facts, a verdict image, locked teasers and a report link. No account or credit needed.
    Show the returned markdown field as-is to the user.
    Next-MOT estimates, repair prices, mileage analysis and older MOT details require the detailed report.
- `full_report`: The detailed report of a car the user has unlocked on their RegTail account: verdict and top risks, every MOT test
    with defects and advisories, mileage analysis, recurring advisories, other sections,
    the viewing checklist, what was not checked, and guidance for explaining it. Use to discuss a car in depth. Needs
    the user's RegTail account linked. Never spends: for a plate that is not unlocked it returns unlocked=false and a
    message; then ask the user before calling unlock_report.
- `my_reports`: The cars the user has unlocked (with when each unlock ends) and their recent checks, so a conversation can pick
    up a car checked earlier. Needs the user's RegTail account linked.
- `resolve_vehicle`: Resolve a typed plate, car photo data URL or supported advert URL to a plate only. No account or spend.
    If uncertain, ask the user to confirm; if unavailable, ask for the typed plate. Then use free_check.
- `sample_report`: The detailed report and viewing advice for one public sample car (CX52HHM, a 2002 Land Rover Defender), to show
    what a detailed report contains. Use when the user asks what RegTail's detailed report looks like. No account needed.
    It is always the same sample car, never the user's car.
- `unlock_report`: Spends one of the user's RegTail credits to unlock the detailed report for this plate for 30 days, then returns
    the detailed report (as full_report does). Ask the user first, every time, and call this only after they agree; never
    unlock on your own initiative or to answer a general question. A plate already unlocked costs nothing again.
    Needs the user's RegTail account linked. With no credits left it unlocks nothing and spends nothing.
- `viewing_advice`: Advice for viewing an unlocked car in person: a summary, priorities to check (each with why and the report
    records behind it) and known weak spots of the model. Needs the user's RegTail account linked and the plate
    unlocked; never spends.