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ableton-mcp

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get_looper_performance_context

Read-onlyIdempotent

Reads a loaded Ableton Looper's state, quantization, monitoring, routing, transport, and parameters in one read-only snapshot.

Instructions

Read one native snapshot of a loaded Looper's State, Quantization, Monitor, Song Control, Tempo Control, all exposed parameters, global clip-launch quantization, track input/output routing, monitoring, and transport. Read-only; source readiness and audible outcome are not 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

A3.8/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true and idempotentHint=true, so the safety profile is covered. The description adds two genuinely useful behavioral facts beyond that: the read is a single point-in-time snapshot ('one native snapshot'), and 'source readiness and audible outcome are not inferred,' which warns the agent not to treat the result as proof of what is actually audible.

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 sentences, front-loaded with the verb and the snapshot concept, with no filler. The long enumeration of captured fields is dense but each item earns its place by defining scope; it could have been punctuated more cleanly, but nothing is redundant.

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

Completeness5/5

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

With an output schema present, the description need not explain return values, and annotations cover the safety profile. The description still supplies the full scope of what the snapshot includes plus the important caveat that readiness and audibility are not inferred, leaving nothing an agent needs missing.

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%, with trackId and deviceId both documented in the schema (including the 'master' special case). The description adds no additional meaning about the parameters, so the baseline of 3 is appropriate.

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 ('Read one native snapshot') and enumerates the exact state surface captured (Looper macros, exposed parameters, routing, monitoring, transport). It is clearly a read tool, but it never explicitly distinguishes itself from near-neighbors like get_looper_export_context or set_looper_state, leaving the agent to infer the boundary from the verb alone.

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?

There is no explicit when-to-use or when-not-to-use guidance and no alternative tool is named. Usage is only implied by the 'read-only' qualifier and the enumeration of captured state, so an agent must reason about the pairing with set_looper_state or export_looper_clip on its own.

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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