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ableton-mcp

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get_beat_repeat_performance_context

Read-onlyIdempotent

Read a read-only performance snapshot of a loaded Beat Repeat in Ableton Live: Repeat, Grid, Interval, Block Triplets, Mix Type, parameters, displays, routing, monitoring, transport.

Instructions

Read one native snapshot of a loaded Beat Repeat's Repeat, Grid, Interval, Block Triplets, Mix Type, all exposed parameters and their display values, track routing, monitoring, and transport. Grid and Interval expose labels at their native integer positions; duplicate labels are not assumed equivalent, and quantized behavior is not inferred from this mapping. Read-only; no audible outcome is inferred.

Input Schema

NameRequiredDescriptionDefault
trackIdYestrack-N from list_tracks, return-N from get_set_mixer, or master.
deviceIdYesID from list_devices.

Output Schema

NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changedv0.3.1
    • removedOutput schema / additionalProperties
      Removed value: -true
    • addedOutput schema / anyOf
      Added value: +[
+  {
+    "properties": {
+      "clipId": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "controls": {
+        "type": "object"
+      },
+      "device": {
+        "type": "object"
+      },
+      "deviceId": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "identityToken": {
+        "type": "string"
+      },
+      "parameters": {
+        "items": {
+          "type": "object"
+        },
+        "type": "array"
+      },
+      "reason": {
+        "anyOf": [
+          {
+            "type": "string"
+          },
+          {
+            "type": "null"
+          }
+        ]
+      },
+      "setFingerprint": {
+        "type": "string"
+      },
+      "stateVersion": {
+        "minimum": 1,
+        "type": "integer"
+      },
+      "status": {
+        "type": "string"
+      },
+      "supported": {
+        "type": "boolean"
+      },
+      "trackId": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "stateVersion"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "error": {
+        "properties": {
+          "message": {
+            "type": "string"
+          },
+          "outcome": {
+            "enum": [
+              "unknown",
+              "not_executed"
+            ]
+          }
+        },
+        "required": [
+          "message",
+          "outcome"
+        ],
+        "type": "object"
+      }
+    },
+    "required": [
+      "error"
+    ],
+    "type": "object"
+  }
+]
  2. Changed3 schema fields changedv0.3.0
    • changedInput schema / properties / deviceId / description
      Previous value: -"Stable device ID returned by list_devices."New value: +"ID from list_devices."
    • changedInput schema / properties / trackId / description
      Previous value: -"Stable device-owner ID: track-N from list_tracks, return-N from get_set_mixer, or master."New value: +"track-N from list_tracks, return-N from get_set_mixer, or master."
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "type": "object"
+}
  3. First observedv0.1.0

TDQS

A3.9/5.0
Behavior4/5

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

Annotations already carry the safety profile (readOnly, idempotent, non-destructive), yet the description still adds real domain caveats: labels sit at native integer positions, duplicate labels are not equivalent, and quantization must not be inferred. That is genuine behavioral guidance beyond the structured fields, though it says nothing about failure modes for a non-Beat-Repeat device.

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?

Front-loaded with the core action and scope in the first clause; every clause is substantive rather than filler. The single long enumeration sentence is dense but the content is all load-bearing, with the caveats correctly placed at the end.

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?

An output schema exists, so return-value explanation is not required, and the description still names the covered fields. What remains unstated is behavior when the device is not a Beat Repeat or is unloaded, which an agent would want to know before calling.

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?

Both parameters (trackId, deviceId) are fully documented in the schema at 100% coverage, including the 'track-N / return-N / master' format and where deviceId comes from. The description adds no parameter-level detail, so the baseline 3 applies.

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

Purpose5/5

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

States a specific verb (read) and a precisely enumerated resource: Repeat, Grid, Interval, Block Triplets, Mix Type, parameters, routing, monitoring, transport of a loaded Beat Repeat. This enumeration cleanly separates it from sibling writers (set_beat_repeat_grid, set_beat_repeat_interval) and from get_beat_repeat_fill.

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 scope ('a loaded Beat Repeat') implies usage, and 'read-only; no audible outcome is inferred' signals this is inspection, not action. However, it never explicitly names an alternative such as list_device_parameters or get_beat_repeat_fill, nor states when not to use it (e.g. device not present, non-Beat-Repeat device).

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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