TuneWorks

Get vehicle modification

get_vehicle_modification

Read-only

Read one structured modification from an accessible TuneWorks vehicle.

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>",
      "modificationId": "<modificationId>"
    },
    "name": "get_vehicle_modification"
  }
}

Input Schema

Name	Required	Description	Default
`vehicleId`	Yes
`modificationId`	Yes

Output Schema

Name	Required	Description
`logs`	No
`tool`	Yes	TuneWorks MCP tool name that produced this result.
`user`	No
`count`	No
`lists`	No
`setups`	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.
`sessions`	No
`vehicles`	No
`snapshots`	No
`activation`	No
`maintenance`	No
`modifications`	No
`requestedVehicleId`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed8 schema fields changedOct 24, 2026

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 / logs

Added value: +{
+  "items": {
+    "type": "object"
+  },
+  "type": "array"
+}

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

addedOutput schema / properties / modifications

Added value: +{
+  "items": {
+    "type": "object"
+  },
+  "type": "array"
+}

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"
+}

addedOutput schema / properties / requestedVehicleId
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / snapshots

Added value: +{
+  "items": {
+    "type": "object"
+  },
+  "type": "array"
+}

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

B3.3/5.0

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 the access constraint 'accessible TuneWorks vehicle' and return nature 'structured modification', but does not describe error behavior for missing or inaccessible records.

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?

The definition is a single front-loaded sentence with no filler. Every phrase contributes to identifying the operation and its scope.

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

Completeness3/5

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

The tool has an output schema and safe-read annotations, which reduce the description's burden. Still, for a two-parameter lookup with no schema parameter descriptions, the definition does not explain identifier semantics or failure cases, leaving an agent with gaps when invoking it.

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 0%, so vehicleId and modificationId are documented only by their names. The description implies the modification belongs to a vehicle but does not explain identifier formats, access requirements, or whether modificationId is scoped to vehicleId.

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: 'Read one structured modification' from a TuneWorks vehicle. It clearly implies a single-record retrieval, distinguishing it from list_vehicle_modifications and mutation siblings, though it does not explicitly name those alternatives.

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?

The phrase 'from an accessible TuneWorks vehicle' implies an access precondition, and 'one' implies single-record retrieval rather than listing. However, it does not explicitly say when to use this instead of list_vehicle_modifications, get_vehicle_context, or update_vehicle_modification.

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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