TuneWorks

Update vehicle

update_vehicle

Destructive

Edits an existing vehicle in the connected user’s TuneWorks garage. Deletes are not supported.

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": {
      "vehicleId": "<vehicleId>"
    },
    "name": "update_vehicle"
  }
}

Input Schema

Name	Required	Description
`vin`	No
`fuel`	No
`make`	No
`year`	No
`model`	No
`owner`	No
`mileage`	No
`purpose`	No
`subModel`	No
`vehicleId`	Yes
`aspiration`	No
`engineType`	No
`fuelRating`	No
`engineHours`	No
`engineModel`	No
`displacement`	No
`modifications`	No
`transmissionType`	No
`cylindersOrRotors`	No
`expectedUpdatedAt`	No	Optional optimistic-concurrency timestamp from a previous TuneWorks response.
`transmissionSpeeds`	No

Output Schema

Name	Required	Description
`url`	No
`list`	No
`tool`	Yes	TuneWorks MCP tool name that produced this result.
`user`	No
`setup`	No
`status`	Yes	Stable result status such as ok, created, updated, sent, auth_required, or confirmation_required.
`message`	No
`outcome`	No	Optional domain outcome for an otherwise successful read.
`session`	No
`tracker`	No
`vehicle`	No
`activation`	No
`modification`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed6 schema fields changedOct 24, 2026

changedOutput schema / description

Previous value: -"TuneWorks app object create/update result with the saved object and connected user."New value: +"TuneWorks app object create/update result with the saved object, connected user, and next activation actions."

addedOutput schema / properties / activation

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "goal": {
+      "const": "optimize_vehicle",
+      "type": "string"
+    },
+    "missingData": {
+      "items": {
+        "enum": [
+          "vehicle",
+          "accessible_vehicle_id",
+          "baseline_setup",
+          "driving_session",
+          "vehicle_build_state",
+          "vehicle_logs",
+          "structured_vehicle_modifications"
+        ],
+        "type": "string"
+      },
+      "type": "array",
+      "uniqueItems": true
+    },
+    "nextActions": {
+      "items": {
+        "oneOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "arguments": {
+                "additionalProperties": false,
+                "properties": {
+                  "vehicleId": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "vehicleId"
+                ],
+                "type": "object"
+              },
+              "optional": {
+                "type": "boolean"
+              },
+              "reason": {
+                "type": "string"
+              },
+              "requiredInputs": {
+                "items": {
+                  "enum": [
+                    "year",
+                    "make",
+                    "model",
+                    "purpose",
+                    "displacement",
+                    "engineType",
+                    "aspiration",
+                    "cylindersOrRotors",
+                    "fuel",
+                    "fuelRating",
+                    "setupName",
+                    "setupDate",
+                    "sessionDate",
+                    "sessionFormat",
+                    "modifications",
+                    "category",
+                    "system",
+                    "status",
+                    "brand",
+                    "partName"
+                  ],
+                  "type": "string"
+                },
+                "type": "array",
+                "uniqueItems": true
+              },
+              "tool": {
+                "enum": [
+                  "create_vehicle",
+                  "list_vehicles",
+                  "get_vehicle_context",
+                  "create_setup",
+                  "create_session",
+                  "update_vehicle",
+                  "create_vehicle_modification"
+                ],
+                "type": "string"
+              },
+              "type": {
+                "const": "tool",
+                "type": "string"
+              }
+            },
+            "required": [
+              "type",
+              "tool",
+              "reason"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "action": {
+                "enum": [
+                  "select_vehicle",
+                  "optimize_vehicle"
+                ],
+                "type": "string"
+              },
+              "optional": {
+                "type": "boolean"
+              },
+              "reason": {
+                "type": "string"
+              },
+              "type": {
+                "const": "assistant",
+                "type": "string"
+              }
+            },
+            "required": [
+              "type",
+              "action",
+              "reason"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "type": "array"
+    },
+    "recommendedData": {
+      "items": {
+        "enum": [
+          "vehicle",
+          "accessible_vehicle_id",
+          "baseline_setup",
+          "driving_session",
+          "vehicle_build_state",
+          "vehicle_logs",
+          "structured_vehicle_modifications"
+        ],
+        "type": "string"
+      },
+      "type": "array",
+      "uniqueItems": true
+    },
+    "requestedVehicleId": {
+      "type": "string"
+    },
+    "stage": {
+      "enum": [
+        "empty_garage",
+        "select_vehicle",
+        "vehicle_selected",
+        "vehicle_created",
+        "collecting_baseline_data",
+        "ready_to_optimize"
+      ],
+      "type": "string"
+    },
+    "vehicleId": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "goal",
+    "stage",
+    "missingData",
+    "recommendedData",
+    "nextActions"
+  ],
+  "type": "object"
+}

addedOutput schema / properties / message
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / modification
```
Added value: +{
+  "type": "object"
+}
```

addedOutput schema / properties / outcome

Added value: +{
+  "description": "Optional domain outcome for an otherwise successful read.",
+  "enum": [
+    "no_vehicles",
+    "vehicle_not_found",
+    "vehicle_selection_required",
+    "no_data"
+  ],
+  "type": "string"
+}

changedOutput schema / properties / status / description

Previous value: -"Result status such as ok, created, updated, sent, auth_required, or confirmation_required."New value: +"Stable result status such as ok, created, updated, sent, auth_required, or confirmation_required."

First observedOct 18, 2026

TDQS

C2.9/5.0

Behavior2/5

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

Annotations already declare readOnlyHint=false and destructiveHint=true, so the safety profile is carried by structured data; the description adds only the negative fact that deletes aren't supported and the 'connected user's garage' scoping. It says nothing about the behavior that matters most for a 21-field destructive edit: whether this is a partial patch or a full replacement, and what happens to fields that are omitted.

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

Conciseness4/5

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

Two short sentences, front-loaded with the operation and free of filler. The economy is appropriate, though it slides toward under-specification for a tool this wide.

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

Completeness2/5

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

With 21 parameters, 5% schema coverage, a destructive mutation and an output schema already present, the description should at minimum state patch-vs-replace semantics and the role of expectedUpdatedAt. It covers none of that, so an agent can identify the tool but not call it safely.

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

Parameters2/5

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

Schema description coverage is 5% across 21 parameters, so the description carries the burden of documenting them and it names none — not even the required vehicleId. Only the vehicle-attribute framing is implied by 'vehicle'; the concurrency token, enums and unit conventions are left entirely to the schema.

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?

Specifies the verb (edits), the resource (an existing vehicle) and the scope (the connected user's TuneWorks garage), so the agent knows it mutates a pre-existing record rather than creating one. It does not distinguish itself from nearby siblings such as update_vehicle_make, update_vehicle_modification, create_vehicle or archive_vehicle, which is the only thing keeping it from a 5.

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

Usage Guidelines3/5

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

'Edits an existing vehicle' plus 'Deletes are not supported' implicitly routes the agent away from create_vehicle and archive_vehicle, but neither alternative is named and no prerequisites (ownership, permissions, stale-data handling) are stated. Usage is inferable rather than explicit.

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

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