ableton-mcp

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recall_track_state_snapshot

Destructive

Restore captured Ableton track-state JSON onto exactly compatible track topology and group membership, including mixer, sends, routing, Drum Rack pads, and nested parameters in one guarded undo step.

Instructions

Plan or recall captured track-state JSON onto exactly compatible topology and group membership (when captured). Restores track and rack-chain mixer, sends, routing, Drum Rack note routing, populated pad mute/solo and exposed nested parameters in one guarded native undo step; older snapshots without group context remain supported. Does not load devices, clips, samples, hidden state, automation or mappings.

Input Schema

Name	Required	Description
`dryRun`	No	False executes with token and hash.
`trackId`	Yes	ID from list_tracks.
`planHash`	No	Plan hash.
`snapshot`	Yes
`confirmationToken`	No	Single-use plan token.
`expectedStateVersion`	Yes	Observed stateVersion.

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed2 schema fields changedv0.3.1Oct 23, 2026

removedOutput schema / additionalProperties
```
Removed value: -true
```

addedOutput schema / anyOf

Added value: +[
+  {
+    "oneOf": [
+      {
+        "properties": {
+          "confirmation": {
+            "properties": {
+              "expiresAt": {
+                "type": "number"
+              },
+              "planHash": {
+                "pattern": "^[a-f0-9]{64}$",
+                "type": "string"
+              },
+              "token": {
+                "minLength": 1,
+                "type": "string"
+              }
+            },
+            "required": [
+              "token",
+              "planHash",
+              "expiresAt"
+            ],
+            "type": "object"
+          },
+          "dryRun": {
+            "const": true
+          },
+          "plan": {
+            "type": "object"
+          }
+        },
+        "required": [
+          "dryRun",
+          "plan",
+          "confirmation"
+        ],
+        "type": "object"
+      },
+      {
+        "properties": {
+          "dryRun": {
+            "const": false
+          },
+          "operationOutcome": {
+            "properties": {
+              "evidence": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "reason": {
+                "type": "string"
+              },
+              "schemaVersion": {
+                "const": 1
+              },
+              "status": {
+                "enum": [
+                  "applied",
+                  "outcome_unknown",
+                  "postconditions_failed",
+                  "pending_postconditions",
+                  "pending_user_action"
+                ]
+              }
+            },
+            "required": [
+              "schemaVersion",
+              "status",
+              "reason",
+              "evidence"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "dryRun",
+          "operationOutcome"
+        ],
+        "type": "object"
+      }
+    ],
+    "properties": {
+      "dryRun": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "dryRun"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "error": {
+        "properties": {
+          "message": {
+            "type": "string"
+          },
+          "outcome": {
+            "enum": [
+              "unknown",
+              "not_executed"
+            ]
+          }
+        },
+        "required": [
+          "message",
+          "outcome"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  }
+]

Changed6 schema fields changedv0.3.0Oct 19, 2026

changedInput schema / properties / confirmationToken / description

Previous value: -"Short-lived, single-use token returned by the matching dry run."New value: +"Single-use plan token."

changedInput schema / properties / dryRun / description

Previous value: -"Omit or true to return a plan; false requires a valid confirmationToken."New value: +"False executes with token and hash."

changedInput schema / properties / expectedStateVersion / description

Previous value: -"Exact stateVersion observed immediately before planning."New value: +"Observed stateVersion."

changedInput schema / properties / planHash / description

Previous value: -"Hash returned by the matching dry run."New value: +"Plan hash."

changedInput schema / properties / trackId / description

Previous value: -"Stable track ID returned by list_tracks."New value: +"ID from list_tracks."

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "type": "object"
+}

Changed5 schema fields changedv0.2.0Sep 30, 2026

removedInput schema / properties / snapshot / additionalProperties
```
Removed value: -false
```

addedInput schema / properties / snapshot / oneOf

Added value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "devices": {
+        "description": "Ordered top-level device topology.",
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "className": {
+              "description": "Exact native device class.",
+              "type": "string"
+            },
+            "name": {
+              "description": "Captured device name.",
+              "type": "string"
+            },
+            "parameters": {
+              "description": "Complete ordered exposed parameter layout and values.",
+              "items": {
+                "additionalProperties": false,
+                "properties": {
+                  "max": {
+                    "description": "Native maximum.",
+                    "type": "number"
+                  },
+                  "min": {
+                    "description": "Native minimum.",
+                    "type": "number"
+                  },
+                  "originalName": {
+                    "description": "Native parameter identity in index order.",
+                    "type": "string"
+                  },
+                  "quantized": {
+                    "description": "Native quantization.",
+                    "type": "boolean"
+                  },
+                  "value": {
+                    "description": "Captured native value.",
+                    "type": "number"
+                  },
+                  "valueItems": {
+                    "description": "Exact ordered choice labels.",
+                    "items": {
+                      "description": "Native value label.",
+                      "type": "string"
+                    },
+                    "type": "array"
+                  }
+                },
+                "required": [
+                  "originalName",
+                  "min",
+                  "max",
+                  "quantized",
+                  "valueItems",
+                  "value"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "type": {
+              "description": "Native device type.",
+              "type": "string"
+            }
+          },
+          "required": [
+            "name",
+            "className",
+            "type",
+            "parameters"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "format": {
+        "const": "cavi-track-state-v1"
+      },
+      "mixer": {
+        "additionalProperties": false,
+        "properties": {
+          "mute": {
+            "description": "Captured mute.",
+            "type": "boolean"
+          },
+          "pan": {
+            "description": "Captured pan.",
+            "type": "number"
+          },
+          "sends": {
+            "description": "Ordered named sends.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "id": {
+                  "description": "Stable return ID.",
+                  "type": "string"
+                },
+                "name": {
+                  "description": "Captured return name.",
+                  "type": "string"
+                },
+                "value": {
+                  "description": "Captured send value.",
+                  "type": "number"
+                }
+              },
+              "required": [
+                "id",
+                "name",
+                "value"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "solo": {
+            "description": "Captured solo.",
+            "type": "boolean"
+          },
+          "volume": {
+            "description": "Captured volume.",
+            "type": "number"
+          }
+        },
+        "required": [
+          "volume",
+          "pan",
+          "mute",
+          "solo",
+          "sends"
+        ],
+        "type": "object"
+      },
+      "routing": {
+        "additionalProperties": false,
+        "properties": {
+          "inputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "inputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "monitoring": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "outputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "outputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "inputTypeId",
+          "inputChannelId",
+          "outputTypeId",
+          "outputChannelId",
+          "monitoring"
+        ],
+        "type": "object"
+      },
+      "track": {
+        "additionalProperties": false,
+        "properties": {
+          "groupTrackId": {
+            "description": "Captured parent Group Track ID; absent in older snapshots.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "isGroup": {
+            "description": "Captured Group Track state.",
+            "type": "boolean"
+          },
+          "isGrouped": {
+            "description": "Captured child-group membership; absent in older snapshots.",
+            "type": "boolean"
+          },
+          "name": {
+            "description": "Captured track name.",
+            "type": "string"
+          },
+          "type": {
+            "enum": [
+              "midi",
+              "audio",
+              "group",
+              "unknown"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "type",
+          "isGroup"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "format",
+      "track",
+      "mixer",
+      "routing",
+      "devices"
+    ],
+    "type": "object"
+  },
+  {
+    "$defs": {
+      "chain": {
+        "additionalProperties": false,
+        "properties": {
+          "devices": {
+            "description": "Nested devices in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/1/$defs/device"
+            },
+            "type": "array"
+          },
+          "name": {
+            "description": "Captured chain name.",
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "devices"
+        ],
+        "type": "object"
+      },
+      "device": {
+        "additionalProperties": false,
+        "properties": {
+          "chains": {
+            "description": "Rack chains in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/1/$defs/chain"
+            },
+            "type": "array"
+          },
+          "className": {
+            "description": "Exact native device class.",
+            "type": "string"
+          },
+          "name": {
+            "description": "Captured device name.",
+            "type": "string"
+          },
+          "parameters": {
+            "description": "Complete exposed parameter layout and values.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "max": {
+                  "description": "Native maximum.",
+                  "type": "number"
+                },
+                "min": {
+                  "description": "Native minimum.",
+                  "type": "number"
+                },
+                "originalName": {
+                  "description": "Native parameter identity in index order.",
+                  "type": "string"
+                },
+                "quantized": {
+                  "description": "Native quantization.",
+                  "type": "boolean"
+                },
+                "value": {
+                  "description": "Captured native value.",
+                  "type": "number"
+                },
+                "valueItems": {
+                  "description": "Exact ordered choice labels.",
+                  "items": {
+                    "description": "Native value label.",
+                    "type": "string"
+                  },
+                  "type": "array"
+                }
+              },
+              "required": [
+                "originalName",
+                "min",
+                "max",
+                "quantized",
+                "valueItems",
+                "value"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "returnChains": {
+            "description": "Rack return chains in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/1/$defs/chain"
+            },
+            "type": "array"
+          },
+          "type": {
+            "description": "Native device type.",
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "className",
+          "type",
+          "parameters"
+        ],
+        "type": "object"
+      }
+    },
+    "additionalProperties": false,
+    "properties": {
+      "devices": {
+        "description": "Ordered devices including nested rack chains.",
+        "items": {
+          "$ref": "#/properties/snapshot/oneOf/1/$defs/device"
+        },
+        "type": "array"
+      },
+      "format": {
+        "const": "cavi-track-state-v2"
+      },
+      "mixer": {
+        "additionalProperties": false,
+        "properties": {
+          "mute": {
+            "description": "Captured mute.",
+            "type": "boolean"
+          },
+          "pan": {
+            "description": "Captured pan.",
+            "type": "number"
+          },
+          "sends": {
+            "description": "Ordered named sends.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "id": {
+                  "description": "Stable return ID.",
+                  "type": "string"
+                },
+                "name": {
+                  "description": "Captured return name.",
+                  "type": "string"
+                },
+                "value": {
+                  "description": "Captured send value.",
+                  "type": "number"
+                }
+              },
+              "required": [
+                "id",
+                "name",
+                "value"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "solo": {
+            "description": "Captured solo.",
+            "type": "boolean"
+          },
+          "volume": {
+            "description": "Captured volume.",
+            "type": "number"
+          }
+        },
+        "required": [
+          "volume",
+          "pan",
+          "mute",
+          "solo",
+          "sends"
+        ],
+        "type": "object"
+      },
+      "routing": {
+        "additionalProperties": false,
+        "properties": {
+          "inputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "inputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "monitoring": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "outputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "outputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "inputTypeId",
+          "inputChannelId",
+          "outputTypeId",
+          "outputChannelId",
+          "monitoring"
+        ],
+        "type": "object"
+      },
+      "track": {
+        "additionalProperties": false,
+        "properties": {
+          "groupTrackId": {
+            "description": "Captured parent Group Track ID; absent in older snapshots.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "isGroup": {
+            "description": "Captured Group Track state.",
+            "type": "boolean"
+          },
+          "isGrouped": {
+            "description": "Captured child-group membership; absent in older snapshots.",
+            "type": "boolean"
+          },
+          "name": {
+            "description": "Captured track name.",
+            "type": "string"
+          },
+          "type": {
+            "enum": [
+              "midi",
+              "audio",
+              "group",
+              "unknown"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "type",
+          "isGroup"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "format",
+      "track",
+      "mixer",
+      "routing",
+      "devices"
+    ],
+    "type": "object"
+  },
+  {
+    "$defs": {
+      "chain": {
+        "additionalProperties": false,
+        "properties": {
+          "devices": {
+            "description": "Nested devices in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/2/$defs/device"
+            },
+            "type": "array"
+          },
+          "mixer": {
+            "additionalProperties": false,
+            "properties": {
+              "mute": {
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "pan": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "sends": {
+                "description": "Ordered rack-chain sends.",
+                "items": {
+                  "description": "Ordered native send level.",
+                  "type": "number"
+                },
+                "type": "array"
+              },
+              "solo": {
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "volume": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "volume",
+              "pan",
+              "sends",
+              "mute",
+              "solo"
+            ],
+            "type": "object"
+          },
+          "name": {
+            "description": "Captured chain name.",
+            "type": "string"
+          },
+          "noteRouting": {
+            "additionalProperties": false,
+            "properties": {
+              "inputNote": {
+                "maximum": 127,
+                "minimum": 0,
+                "type": [
+                  "integer",
+                  "null"
+                ]
+              },
+              "outputNote": {
+                "maximum": 127,
+                "minimum": 0,
+                "type": [
+                  "integer",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "inputNote",
+              "outputNote"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "name",
+          "mixer",
+          "noteRouting",
+          "devices"
+        ],
+        "type": "object"
+      },
+      "device": {
+        "additionalProperties": false,
+        "properties": {
+          "chains": {
+            "description": "Rack chains in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/2/$defs/chain"
+            },
+            "type": "array"
+          },
+          "className": {
+            "description": "Exact native device class.",
+            "type": "string"
+          },
+          "name": {
+            "description": "Captured device name.",
+            "type": "string"
+          },
+          "parameters": {
+            "description": "Complete exposed parameter layout and values.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "max": {
+                  "description": "Native maximum.",
+                  "type": "number"
+                },
+                "min": {
+                  "description": "Native minimum.",
+                  "type": "number"
+                },
+                "originalName": {
+                  "description": "Native parameter identity in index order.",
+                  "type": "string"
+                },
+                "quantized": {
+                  "description": "Native quantization.",
+                  "type": "boolean"
+                },
+                "value": {
+                  "description": "Captured native value.",
+                  "type": "number"
+                },
+                "valueItems": {
+                  "description": "Exact ordered choice labels.",
+                  "items": {
+                    "description": "Native value label.",
+                    "type": "string"
+                  },
+                  "type": "array"
+                }
+              },
+              "required": [
+                "originalName",
+                "min",
+                "max",
+                "quantized",
+                "valueItems",
+                "value"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "returnChains": {
+            "description": "Rack return chains in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/2/$defs/chain"
+            },
+            "type": "array"
+          },
+          "type": {
+            "description": "Native device type.",
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "className",
+          "type",
+          "parameters"
+        ],
+        "type": "object"
+      }
+    },
+    "additionalProperties": false,
+    "properties": {
+      "devices": {
+        "description": "Ordered devices including rack controls.",
+        "items": {
+          "$ref": "#/properties/snapshot/oneOf/2/$defs/device"
+        },
+        "type": "array"
+      },
+      "format": {
+        "const": "cavi-track-state-v3"
+      },
+      "mixer": {
+        "additionalProperties": false,
+        "properties": {
+          "mute": {
+            "description": "Captured mute.",
+            "type": "boolean"
+          },
+          "pan": {
+            "description": "Captured pan.",
+            "type": "number"
+          },
+          "sends": {
+            "description": "Ordered named sends.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "id": {
+                  "description": "Stable return ID.",
+                  "type": "string"
+                },
+                "name": {
+                  "description": "Captured return name.",
+                  "type": "string"
+                },
+                "value": {
+                  "description": "Captured send value.",
+                  "type": "number"
+                }
+              },
+              "required": [
+                "id",
+                "name",
+                "value"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "solo": {
+            "description": "Captured solo.",
+            "type": "boolean"
+          },
+          "volume": {
+            "description": "Captured volume.",
+            "type": "number"
+          }
+        },
+        "required": [
+          "volume",
+          "pan",
+          "mute",
+          "solo",
+          "sends"
+        ],
+        "type": "object"
+      },
+      "routing": {
+        "additionalProperties": false,
+        "properties": {
+          "inputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "inputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "monitoring": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "outputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "outputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "inputTypeId",
+          "inputChannelId",
+          "outputTypeId",
+          "outputChannelId",
+          "monitoring"
+        ],
+        "type": "object"
+      },
+      "track": {
+        "additionalProperties": false,
+        "properties": {
+          "groupTrackId": {
+            "description": "Captured parent Group Track ID; absent in older snapshots.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "isGroup": {
+            "description": "Captured Group Track state.",
+            "type": "boolean"
+          },
+          "isGrouped": {
+            "description": "Captured child-group membership; absent in older snapshots.",
+            "type": "boolean"
+          },
+          "name": {
+            "description": "Captured track name.",
+            "type": "string"
+          },
+          "type": {
+            "enum": [
+              "midi",
+              "audio",
+              "group",
+              "unknown"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "type",
+          "isGroup"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "format",
+      "track",
+      "mixer",
+      "routing",
+      "devices"
+    ],
+    "type": "object"
+  },
+  {
+    "$defs": {
+      "chain": {
+        "additionalProperties": false,
+        "properties": {
+          "devices": {
+            "description": "Nested devices in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/3/$defs/device"
+            },
+            "type": "array"
+          },
+          "mixer": {
+            "additionalProperties": false,
+            "properties": {
+              "mute": {
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "pan": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "sends": {
+                "description": "Ordered rack-chain sends.",
+                "items": {
+                  "description": "Ordered native send level.",
+                  "type": "number"
+                },
+                "type": "array"
+              },
+              "solo": {
+                "type": [
+                  "boolean",
+                  "null"
+                ]
+              },
+              "volume": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "volume",
+              "pan",
+              "sends",
+              "mute",
+              "solo"
+            ],
+            "type": "object"
+          },
+          "name": {
+            "description": "Captured chain name.",
+            "type": "string"
+          },
+          "noteRouting": {
+            "additionalProperties": false,
+            "properties": {
+              "inputNote": {
+                "maximum": 127,
+                "minimum": 0,
+                "type": [
+                  "integer",
+                  "null"
+                ]
+              },
+              "outputNote": {
+                "maximum": 127,
+                "minimum": 0,
+                "type": [
+                  "integer",
+                  "null"
+                ]
+              }
+            },
+            "required": [
+              "inputNote",
+              "outputNote"
+            ],
+            "type": "object"
+          }
+        },
+        "required": [
+          "name",
+          "mixer",
+          "noteRouting",
+          "devices"
+        ],
+        "type": "object"
+      },
+      "device": {
+        "additionalProperties": false,
+        "properties": {
+          "chains": {
+            "description": "Rack chains in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/3/$defs/chain"
+            },
+            "type": "array"
+          },
+          "className": {
+            "description": "Exact native device class.",
+            "type": "string"
+          },
+          "drumPads": {
+            "description": "Populated Drum Rack pads in native order.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "mute": {
+                  "description": "Captured pad mute.",
+                  "type": "boolean"
+                },
+                "note": {
+                  "maximum": 127,
+                  "minimum": 0,
+                  "type": "integer"
+                },
+                "solo": {
+                  "description": "Captured pad solo.",
+                  "type": "boolean"
+                }
+              },
+              "required": [
+                "note",
+                "mute",
+                "solo"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "name": {
+            "description": "Captured device name.",
+            "type": "string"
+          },
+          "parameters": {
+            "description": "Complete exposed parameter layout and values.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "max": {
+                  "description": "Native maximum.",
+                  "type": "number"
+                },
+                "min": {
+                  "description": "Native minimum.",
+                  "type": "number"
+                },
+                "originalName": {
+                  "description": "Native parameter identity in index order.",
+                  "type": "string"
+                },
+                "quantized": {
+                  "description": "Native quantization.",
+                  "type": "boolean"
+                },
+                "value": {
+                  "description": "Captured native value.",
+                  "type": "number"
+                },
+                "valueItems": {
+                  "description": "Exact ordered choice labels.",
+                  "items": {
+                    "description": "Native value label.",
+                    "type": "string"
+                  },
+                  "type": "array"
+                }
+              },
+              "required": [
+                "originalName",
+                "min",
+                "max",
+                "quantized",
+                "valueItems",
+                "value"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "returnChains": {
+            "description": "Rack return chains in native order.",
+            "items": {
+              "$ref": "#/properties/snapshot/oneOf/3/$defs/chain"
+            },
+            "type": "array"
+          },
+          "type": {
+            "description": "Native device type.",
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "className",
+          "type",
+          "parameters"
+        ],
+        "type": "object"
+      }
+    },
+    "additionalProperties": false,
+    "properties": {
+      "devices": {
+        "description": "Ordered devices including Drum Rack pad state.",
+        "items": {
+          "$ref": "#/properties/snapshot/oneOf/3/$defs/device"
+        },
+        "type": "array"
+      },
+      "format": {
+        "const": "cavi-track-state-v4"
+      },
+      "mixer": {
+        "additionalProperties": false,
+        "properties": {
+          "mute": {
+            "description": "Captured mute.",
+            "type": "boolean"
+          },
+          "pan": {
+            "description": "Captured pan.",
+            "type": "number"
+          },
+          "sends": {
+            "description": "Ordered named sends.",
+            "items": {
+              "additionalProperties": false,
+              "properties": {
+                "id": {
+                  "description": "Stable return ID.",
+                  "type": "string"
+                },
+                "name": {
+                  "description": "Captured return name.",
+                  "type": "string"
+                },
+                "value": {
+                  "description": "Captured send value.",
+                  "type": "number"
+                }
+              },
+              "required": [
+                "id",
+                "name",
+                "value"
+              ],
+              "type": "object"
+            },
+            "type": "array"
+          },
+          "solo": {
+            "description": "Captured solo.",
+            "type": "boolean"
+          },
+          "volume": {
+            "description": "Captured volume.",
+            "type": "number"
+          }
+        },
+        "required": [
+          "volume",
+          "pan",
+          "mute",
+          "solo",
+          "sends"
+        ],
+        "type": "object"
+      },
+      "routing": {
+        "additionalProperties": false,
+        "properties": {
+          "inputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "inputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "monitoring": {
+            "type": [
+              "integer",
+              "null"
+            ]
+          },
+          "outputChannelId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "outputTypeId": {
+            "type": [
+              "string",
+              "null"
+            ]
+          }
+        },
+        "required": [
+          "inputTypeId",
+          "inputChannelId",
+          "outputTypeId",
+          "outputChannelId",
+          "monitoring"
+        ],
+        "type": "object"
+      },
+      "track": {
+        "additionalProperties": false,
+        "properties": {
+          "groupTrackId": {
+            "description": "Captured parent Group Track ID; absent in older snapshots.",
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "isGroup": {
+            "description": "Captured Group Track state.",
+            "type": "boolean"
+          },
+          "isGrouped": {
+            "description": "Captured child-group membership; absent in older snapshots.",
+            "type": "boolean"
+          },
+          "name": {
+            "description": "Captured track name.",
+            "type": "string"
+          },
+          "type": {
+            "enum": [
+              "midi",
+              "audio",
+              "group",
+              "unknown"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "name",
+          "type",
+          "isGroup"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "format",
+      "track",
+      "mixer",
+      "routing",
+      "devices"
+    ],
+    "type": "object"
+  }
+]

removedInput schema / properties / snapshot / properties

Removed value: -{
-  "devices": {
-    "description": "Ordered top-level device topology.",
-    "items": {
-      "additionalProperties": false,
-      "properties": {
-        "className": {
-          "description": "Exact native device class.",
-          "type": "string"
-        },
-        "name": {
-          "description": "Captured device name.",
-          "type": "string"
-        },
-        "parameters": {
-          "description": "Complete ordered exposed parameter layout and values.",
-          "items": {
-            "additionalProperties": false,
-            "properties": {
-              "max": {
-                "description": "Native maximum.",
-                "type": "number"
-              },
-              "min": {
-                "description": "Native minimum.",
-                "type": "number"
-              },
-              "originalName": {
-                "description": "Native parameter identity in index order.",
-                "type": "string"
-              },
-              "quantized": {
-                "description": "Native quantization.",
-                "type": "boolean"
-              },
-              "value": {
-                "description": "Captured native value.",
-                "type": "number"
-              },
-              "valueItems": {
-                "description": "Exact ordered choice labels.",
-                "items": {
-                  "description": "Native value label.",
-                  "type": "string"
-                },
-                "type": "array"
-              }
-            },
-            "required": [
-              "originalName",
-              "min",
-              "max",
-              "quantized",
-              "valueItems",
-              "value"
-            ],
-            "type": "object"
-          },
-          "type": "array"
-        },
-        "type": {
-          "description": "Native device type.",
-          "type": "string"
-        }
-      },
-      "required": [
-        "name",
-        "className",
-        "type",
-        "parameters"
-      ],
-      "type": "object"
-    },
-    "type": "array"
-  },
-  "format": {
-    "const": "cavi-track-state-v1"
-  },
-  "mixer": {
-    "additionalProperties": false,
-    "properties": {
-      "mute": {
-        "description": "Captured mute.",
-        "type": "boolean"
-      },
-      "pan": {
-        "description": "Captured pan.",
-        "type": "number"
-      },
-      "sends": {
-        "description": "Ordered named sends.",
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "id": {
-              "description": "Stable return ID.",
-              "type": "string"
-            },
-            "name": {
-              "description": "Captured return name.",
-              "type": "string"
-            },
-            "value": {
-              "description": "Captured send value.",
-              "type": "number"
-            }
-          },
-          "required": [
-            "id",
-            "name",
-            "value"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      },
-      "solo": {
-        "description": "Captured solo.",
-        "type": "boolean"
-      },
-      "volume": {
-        "description": "Captured volume.",
-        "type": "number"
-      }
-    },
-    "required": [
-      "volume",
-      "pan",
-      "mute",
-      "solo",
-      "sends"
-    ],
-    "type": "object"
-  },
-  "routing": {
-    "additionalProperties": false,
-    "properties": {
-      "inputChannelId": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "inputTypeId": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "monitoring": {
-        "type": [
-          "integer",
-          "null"
-        ]
-      },
-      "outputChannelId": {
-        "type": [
-          "string",
-          "null"
-        ]
-      },
-      "outputTypeId": {
-        "type": [
-          "string",
-          "null"
-        ]
-      }
-    },
-    "required": [
-      "inputTypeId",
-      "inputChannelId",
-      "outputTypeId",
-      "outputChannelId",
-      "monitoring"
-    ],
-    "type": "object"
-  },
-  "track": {
-    "additionalProperties": false,
-    "properties": {
-      "isGroup": {
-        "description": "Captured Group Track state.",
-        "type": "boolean"
-      },
-      "name": {
-        "description": "Captured track name.",
-        "type": "string"
-      },
-      "type": {
-        "enum": [
-          "midi",
-          "audio",
-          "group",
-          "unknown"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "name",
-      "type",
-      "isGroup"
-    ],
-    "type": "object"
-  }
-}

removedInput schema / properties / snapshot / required

Removed value: -[
-  "format",
-  "track",
-  "mixer",
-  "routing",
-  "devices"
-]

removedInput schema / properties / snapshot / type
```
Removed value: -"object"
```

First observedv0.1.0Sep 23, 2026

TDQS

A3.7/5.0

Behavior4/5

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

Annotations already declare destructiveHint=true and idempotentHint=false, so the safety profile is partly covered. The description adds real value beyond them: it discloses that the operation is a single guarded native undo step, that topology/group membership must be 'exactly compatible', and that older snapshots without group context are still supported. It does not mention permission or token-expiry behavior.

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 dense sentences, front-loaded with the action and compatibility constraint, followed by the restore scope and the exclusion list. Every clause carries information, though the enumeration is long enough that a reader must parse carefully.

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?

For a destructive mutation with an output schema and strong annotations, the description covers scope, compatibility requirements, undo semantics, and explicit exclusions. It is close to complete; only the plan/execute handshake and error conditions are left to the schema and annotations.

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 83%, so the schema already documents most parameters (dryRun, trackId, planHash, confirmationToken, snapshot format variants). The description adds the compatibility constraint on trackId/topology but no syntax or format detail beyond the schema, so the baseline 3 applies.

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?

States a specific verb pair (plan/recall) and resource (captured track-state JSON), then enumerates exactly what is restored: mixer, sends, routing, Drum Rack note routing, pad mute/solo, nested parameters. The scope enumeration plus the negative clause ('does not load devices, clips, samples') implicitly separates it from sibling snapshot tools, but no sibling is named explicitly.

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?

'Plan or recall' plus the dryRun/planHash/confirmationToken parameters imply a plan-then-execute workflow, and the closing sentence gives scope exclusions. However, it never says when to choose this over load_track_state_snapshot, recall_group_system_snapshot, or recall_device_chain_snapshot, leaving the routing to inference.

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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