AUTO411 Vehicle Intelligence

Get Wheel and Tire Fitment

get_vehicle_fitment

Read-only

Use this for wheel and tire fitment after identifying a vehicle by VIN or year, make, and model. Returns available OEM tire sizes, bolt pattern / PCD, center bore, wheel offset, and thread / lug size without guessing through ambiguous configurations.

Input Schema

TableJSON Schema

Name	Required	Description
`vin`	No	Full 17-character VIN. Use VIN by itself as the identity path, or omit it and provide year, make, and model.
`make`	No	Vehicle make. Required with year and model when VIN is not provided.
`trim`	No	Optional identity refinement. Use only an explicitly known trim.
`year`	No	Model year. Required with make and model when VIN is not provided.
`model`	No	Customer-facing model family. Required with year and make when VIN is not provided.
`engine`	No	Optional identity refinement. Use only an explicitly known engine.
`drivetrain`	No	Optional identity refinement. Use only an explicitly known drivetrain.
`configuration_id`	No	AUTO411 configuration identifier returned by a prior NEEDS_IDENTITY response.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`error`	No
`choices`	No
`fitment`	No
`conflicts`	No
`fact_scope`	No
`choice_count`	No
`completeness`	No
`missing_fields`	No
`evidence_status`	No
`policy_withheld`	No
`configuration_id`	No
`agent_instruction`	Yes
`canonical_vehicle`	No
`resolution_status`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed9 schema fields changedSep 28, 2026

addedInput schema / properties / configuration_id / description

Added value: +"AUTO411 configuration identifier returned by a prior NEEDS_IDENTITY response."

addedInput schema / properties / drivetrain / description

Added value: +"Optional identity refinement. Use only an explicitly known drivetrain."

addedInput schema / properties / engine / description

Added value: +"Optional identity refinement. Use only an explicitly known engine."

addedInput schema / properties / make / description

Added value: +"Vehicle make. Required with year and model when VIN is not provided."

addedInput schema / properties / model / description

Added value: +"Customer-facing model family. Required with year and make when VIN is not provided."

addedInput schema / properties / trim / description

Added value: +"Optional identity refinement. Use only an explicitly known trim."

changedInput schema / properties / vin / description

Previous value: -"17-character VIN"New value: +"Full 17-character VIN. Use VIN by itself as the identity path, or omit it and provide year, make, and model."

addedInput schema / properties / year / description

Added value: +"Model year. Required with make and model when VIN is not provided."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "properties": {
+    "agent_instruction": {
+      "type": "string"
+    },
+    "canonical_vehicle": {
+      "anyOf": [
+        {
+          "additionalProperties": {},
+          "properties": {
+            "configuration_id": {
+              "type": "number"
+            },
+            "drivetrain": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "engine": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "generation": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "identity": {
+              "additionalProperties": {
+                "type": [
+                  "string",
+                  "number",
+                  "boolean",
+                  "null"
+                ]
+              },
+              "propertyNames": {
+                "type": "string"
+              },
+              "type": "object"
+            },
+            "make": {
+              "type": "string"
+            },
+            "model": {
+              "type": "string"
+            },
+            "trim": {
+              "type": [
+                "string",
+                "null"
+              ]
+            },
+            "year": {
+              "type": [
+                "number",
+                "string"
+              ]
+            }
+          },
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ]
+    },
+    "choice_count": {
+      "maximum": 9007199254740991,
+      "minimum": 0,
+      "type": "integer"
+    },
+    "choices": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "configuration_id": {
+            "type": "number"
+          },
+          "drivetrain": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "engine": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "evidence_status": {
+            "type": "string"
+          },
+          "generation": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "identity": {
+            "additionalProperties": {
+              "type": [
+                "string",
+                "number",
+                "boolean",
+                "null"
+              ]
+            },
+            "propertyNames": {
+              "type": "string"
+            },
+            "type": "object"
+          },
+          "trim": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "configuration_id"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "completeness": {
+      "type": "string"
+    },
+    "configuration_id": {
+      "type": [
+        "number",
+        "null"
+      ]
+    },
+    "conflicts": {
+      "items": {},
+      "type": "array"
+    },
+    "error": {
+      "additionalProperties": {},
+      "properties": {
+        "code": {
+          "type": "string"
+        },
+        "message": {
+          "type": "string"
+        },
+        "retryable": {
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "code"
+      ],
+      "type": "object"
+    },
+    "evidence_status": {
+      "type": "string"
+    },
+    "fact_scope": {
+      "type": "string"
+    },
+    "fitment": {
+      "additionalProperties": {},
+      "properties": {
+        "bolt_pattern": {
+          "additionalProperties": {},
+          "properties": {
+            "evidence": {
+              "additionalProperties": {},
+              "properties": {
+                "evidence_status": {
+                  "type": "string"
+                },
+                "fact_scope": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "facts": {
+              "additionalProperties": {},
+              "properties": {
+                "bolt_pattern": {
+                  "description": "Normalized wheel bolt pattern / PCD.",
+                  "type": "string"
+                },
+                "center_bore": {
+                  "description": "Center bore when individually unambiguous.",
+                  "type": "string"
+                },
+                "offset": {
+                  "description": "Wheel offset or range when individually unambiguous.",
+                  "type": "string"
+                },
+                "thread_size": {
+                  "description": "Thread or lug size when individually unambiguous.",
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "status": {
+              "type": "string"
+            },
+            "values": {
+              "items": {},
+              "type": "array"
+            }
+          },
+          "type": "object"
+        },
+        "tires": {
+          "additionalProperties": {},
+          "properties": {
+            "evidence": {
+              "additionalProperties": {},
+              "properties": {
+                "evidence_status": {
+                  "type": "string"
+                },
+                "fact_scope": {
+                  "type": "string"
+                }
+              },
+              "type": "object"
+            },
+            "facts": {
+              "additionalProperties": {},
+              "propertyNames": {
+                "type": "string"
+              },
+              "type": "object"
+            },
+            "status": {
+              "type": "string"
+            },
+            "values": {
+              "description": "Available normalized OEM tire-size values.",
+              "items": {},
+              "type": "array"
+            }
+          },
+          "type": "object"
+        }
+      },
+      "type": "object"
+    },
+    "missing_fields": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "policy_withheld": {
+      "items": {
+        "additionalProperties": {},
+        "properties": {
+          "category": {
+            "type": "string"
+          },
+          "policy_state": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "category",
+          "policy_state"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "resolution_status": {
+      "enum": [
+        "INVALID_INPUT",
+        "MATCHED_SINGLE",
+        "NEEDS_IDENTITY",
+        "NO_MATCH",
+        "UNAVAILABLE",
+        "SOURCE_UNAVAILABLE"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "resolution_status",
+    "agent_instruction"
+  ],
+  "type": "object"
+}

First observedSep 27, 2026

TDQS

A3.8/5.0

Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds useful context by listing the returned attributes and framing the tool as resolving 'ambiguous configurations' without guessing. It says nothing about auth requirements, rate limits, or error/lookup-failure behavior beyond what the schema and annotations imply.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight sentences with no filler: the first leads with purpose and prerequisite, the second with the concrete return payload. Every clause earns its place.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With annotations, a 100%-documented schema, and an output schema present, the description covers the identity prerequisite and the returned fitment data well. It omits mention of the configuration_id continuation path from a prior NEEDS_IDENTITY response, though the schema documents that parameter, leaving a minor gap.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so each parameter is fully documented in the schema itself. The description restates the two identity paths (VIN or year/make/model) but adds no syntax or format detail beyond that. Baseline 3 is appropriate when the schema carries the parameter burden.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource ('wheel and tire fitment') and enumerates the returned data (OEM tire sizes, bolt pattern/PCD, center bore, offset, lug size), which clearly separates it from siblings like get_vehicle_specs or get_vehicle_efficiency. It does not explicitly name the sibling tools, so differentiation is implied by domain rather than stated.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives a clear usage condition and a prerequisite: use it for fitment 'after identifying a vehicle by VIN or year, make, and model.' This routes the agent to resolve the vehicle first. However, it names no explicit alternatives or exclusions for when fitment is the wrong choice versus specs or safety.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

All AUTO411 Vehicle Intelligence tools Inspect

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