check_carrier_identity
Full identity-linkage detail for a carrier: why it's flagged and how confident that is. Priced meaningfully above the free screen_carrier_identity — call that first if you only need the flag and a count.
Never names or points at another carrier (redesigned 2026-09-18 — see schemas.IdentityAssessment's docstring): no linked USDOT number, legal name, or shared-identifier hash. A linked carrier's own identity was never this caller's to receive, and an unsalted hash of a low-entropy value like a phone number or address doesn't meaningfully withhold it from a determined party anyway (confirmed by reading Truckin's own hashing code). Every field here is either the subject carrier's own data or a derivative signal — a score, a match-term-type label (which kind of identifier matched, never the value), a count, a boolean.
SSN and EIN matches carry weight 2.0 each in FMCSA's ARCHI methodology and are not present in public data; D&B is nominally weight 2.0 too but is only genuinely available for ~4% of carriers, and officer data (needed for the name x officer term) is missing for another ~15%. So score_provenance.match_score_ceiling is computed per carrier, not a flat 4.5 — most responses cap out at 2.5 or lower. It also states plainly that recall against FMCSA's own declared-predecessor label set is not measurable. flagged applies FMCSA's own ARCHI flag rule (match_score >= 1.5 AND a linked motive >= 1); it is not a fraud determination and must not be presented as one. Note flagged and match_score >= 1.5 are NOT the same condition — clustering requires 2+ independent identifier-type families to agree, so materially more carriers clear the score threshold than are ever flagged.
Paid. A carrier with no linked carriers is a complete answer and bills; an unknown USDOT number is a free not_found.
Tool call template
Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.
{
"id": 1,
"jsonrpc": "2.0",
"method": "tools/call",
"params": {
"arguments": {
"usdot_number": "<usdot_number>"
},
"name": "check_carrier_identity"
}
}Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| usdot_number | Yes | Carrier USDOT number (digits only), the canonical FMCSA carrier identifier. |