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suno-mcp

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separate_audio_stems

Create a Suno stem-separation task on RunAPI from a source task ID and audio ID; returns a task ID, status, and output URLs for vocals, drums, bass, or selected stems.

Instructions

Create a Suno task on RunAPI (separate audio stems). Returns a task id, status, and output URLs.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
typeNoStem separation mode. Declared type: string. Known values: "separate_vocal", "split_stem", "split_stem_advanced".
waitNoPoll until the task reaches a terminal status.
task_idYesSource task ID. Declared type: string.
audio_idYesAudio ID within the source task. Declared type: string.
stem_nameNoTarget stem for advanced separation. Required when type is split_stem_advanced. Declared type: string. Known values: "Lead Vocal", "Drum Kit", "Kick", "Snare", "Risers", "Bass", "Backing Vocals", "Piano", "Electric Guitar", "Percussion", "String Section", "Synth", "Acoustic Guitar", "Sound Effects", "Synth Pad", "Synth Bass", "Guitar", "Brass Section", "Organ", "Electronic Drum Kit", "Lead Electric Guitar", "Synth Keys", "Rhythm Electric Guitar", "Electric Piano", "Upright Bass", "Keyboards", "Distorted Electric Guitar", "Synth Strings", "Synth Lead", "Woodwinds", "Rhythm Acoustic Guitar", "Flute", "Harp", "Tambourine", "Trumpet", "Arpeggiator", "Accordion", "Fiddle", "Pedal Steel Guitar", "Synth Voice", "Violin", "Digital Piano", "Synth Brass", "Mandolin", "Choir", "Banjo", "Bells", "Clarinet", "Tenor Saxophone", "Trombone", "Shaker", "French Horn", "Glockenspiel", "Electric Bass", "Cello", "Timpani", "Harmonica", "Marimba", "Vibraphone", "Lap Steel Guitar", "Saxophone", "Orchestra", "Horns", "Cymbals", "Hand Clap", "Oboe", "Celesta", "Congas", "Drone", "Alto Saxophone", "Double Bass", "Ukulele", "Harpsichord", "Baritone Saxophone", "Xylophone", "Tuba", "Bass Guitar", "Whistle", "Lead Guitar", "Rhodes", "808", "Bongos", "Bassoon", "Cowbell", "Viola", "Sitar", "Steel Drums", "Piccolo", "Theremin", "Bagpipes", "Hi-Hat", "Music Box", "Melodica", "Tabla", "Koto", "Djembe", "Taiko", "Didgeridoo".
timeout_msNo
callback_urlNoWebhook URL for async notifications. Declared type: string.
poll_interval_msNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed10 schema fields changedv0.4.0
    • addedInput schema / additionalProperties
      Added value: +{}
    • changedInput schema / properties / audio_id / description
      Previous value: -"Audio ID within the source task."New value: +"Audio ID within the source task. Declared type: string."
    • changedInput schema / properties / callback_url / description
      Previous value: -"Webhook URL for async notifications."New value: +"Webhook URL for async notifications. Declared type: string."
    • removedInput schema / properties / stem_name / anyOf
      Removed value: -[
-  {
-    "const": "Lead Vocal",
-    "type": "string"
-  },
-  {
-    "const": "Drum Kit",
-    "type": "string"
-  },
-  {
-    "const": "Kick",
-    "type": "string"
-  },
-  {
-    "const": "Snare",
-    "type": "string"
-  },
-  {
-    "const": "Risers",
-    "type": "string"
-  },
-  {
-    "const": "Bass",
-    "type": "string"
-  },
-  {
-    "const": "Backing Vocals",
-    "type": "string"
-  },
-  {
-    "const": "Piano",
-    "type": "string"
-  },
-  {
-    "const": "Electric Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Percussion",
-    "type": "string"
-  },
-  {
-    "const": "String Section",
-    "type": "string"
-  },
-  {
-    "const": "Synth",
-    "type": "string"
-  },
-  {
-    "const": "Acoustic Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Sound Effects",
-    "type": "string"
-  },
-  {
-    "const": "Synth Pad",
-    "type": "string"
-  },
-  {
-    "const": "Synth Bass",
-    "type": "string"
-  },
-  {
-    "const": "Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Brass Section",
-    "type": "string"
-  },
-  {
-    "const": "Organ",
-    "type": "string"
-  },
-  {
-    "const": "Electronic Drum Kit",
-    "type": "string"
-  },
-  {
-    "const": "Lead Electric Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Synth Keys",
-    "type": "string"
-  },
-  {
-    "const": "Rhythm Electric Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Electric Piano",
-    "type": "string"
-  },
-  {
-    "const": "Upright Bass",
-    "type": "string"
-  },
-  {
-    "const": "Keyboards",
-    "type": "string"
-  },
-  {
-    "const": "Distorted Electric Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Synth Strings",
-    "type": "string"
-  },
-  {
-    "const": "Synth Lead",
-    "type": "string"
-  },
-  {
-    "const": "Woodwinds",
-    "type": "string"
-  },
-  {
-    "const": "Rhythm Acoustic Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Flute",
-    "type": "string"
-  },
-  {
-    "const": "Harp",
-    "type": "string"
-  },
-  {
-    "const": "Tambourine",
-    "type": "string"
-  },
-  {
-    "const": "Trumpet",
-    "type": "string"
-  },
-  {
-    "const": "Arpeggiator",
-    "type": "string"
-  },
-  {
-    "const": "Accordion",
-    "type": "string"
-  },
-  {
-    "const": "Fiddle",
-    "type": "string"
-  },
-  {
-    "const": "Pedal Steel Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Synth Voice",
-    "type": "string"
-  },
-  {
-    "const": "Violin",
-    "type": "string"
-  },
-  {
-    "const": "Digital Piano",
-    "type": "string"
-  },
-  {
-    "const": "Synth Brass",
-    "type": "string"
-  },
-  {
-    "const": "Mandolin",
-    "type": "string"
-  },
-  {
-    "const": "Choir",
-    "type": "string"
-  },
-  {
-    "const": "Banjo",
-    "type": "string"
-  },
-  {
-    "const": "Bells",
-    "type": "string"
-  },
-  {
-    "const": "Clarinet",
-    "type": "string"
-  },
-  {
-    "const": "Tenor Saxophone",
-    "type": "string"
-  },
-  {
-    "const": "Trombone",
-    "type": "string"
-  },
-  {
-    "const": "Shaker",
-    "type": "string"
-  },
-  {
-    "const": "French Horn",
-    "type": "string"
-  },
-  {
-    "const": "Glockenspiel",
-    "type": "string"
-  },
-  {
-    "const": "Electric Bass",
-    "type": "string"
-  },
-  {
-    "const": "Cello",
-    "type": "string"
-  },
-  {
-    "const": "Timpani",
-    "type": "string"
-  },
-  {
-    "const": "Harmonica",
-    "type": "string"
-  },
-  {
-    "const": "Marimba",
-    "type": "string"
-  },
-  {
-    "const": "Vibraphone",
-    "type": "string"
-  },
-  {
-    "const": "Lap Steel Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Saxophone",
-    "type": "string"
-  },
-  {
-    "const": "Orchestra",
-    "type": "string"
-  },
-  {
-    "const": "Horns",
-    "type": "string"
-  },
-  {
-    "const": "Cymbals",
-    "type": "string"
-  },
-  {
-    "const": "Hand Clap",
-    "type": "string"
-  },
-  {
-    "const": "Oboe",
-    "type": "string"
-  },
-  {
-    "const": "Celesta",
-    "type": "string"
-  },
-  {
-    "const": "Congas",
-    "type": "string"
-  },
-  {
-    "const": "Drone",
-    "type": "string"
-  },
-  {
-    "const": "Alto Saxophone",
-    "type": "string"
-  },
-  {
-    "const": "Double Bass",
-    "type": "string"
-  },
-  {
-    "const": "Ukulele",
-    "type": "string"
-  },
-  {
-    "const": "Harpsichord",
-    "type": "string"
-  },
-  {
-    "const": "Baritone Saxophone",
-    "type": "string"
-  },
-  {
-    "const": "Xylophone",
-    "type": "string"
-  },
-  {
-    "const": "Tuba",
-    "type": "string"
-  },
-  {
-    "const": "Bass Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Whistle",
-    "type": "string"
-  },
-  {
-    "const": "Lead Guitar",
-    "type": "string"
-  },
-  {
-    "const": "Rhodes",
-    "type": "string"
-  },
-  {
-    "const": "808",
-    "type": "string"
-  },
-  {
-    "const": "Bongos",
-    "type": "string"
-  },
-  {
-    "const": "Bassoon",
-    "type": "string"
-  },
-  {
-    "const": "Cowbell",
-    "type": "string"
-  },
-  {
-    "const": "Viola",
-    "type": "string"
-  },
-  {
-    "const": "Sitar",
-    "type": "string"
-  },
-  {
-    "const": "Steel Drums",
-    "type": "string"
-  },
-  {
-    "const": "Piccolo",
-    "type": "string"
-  },
-  {
-    "const": "Theremin",
-    "type": "string"
-  },
-  {
-    "const": "Bagpipes",
-    "type": "string"
-  },
-  {
-    "const": "Hi-Hat",
-    "type": "string"
-  },
-  {
-    "const": "Music Box",
-    "type": "string"
-  },
-  {
-    "const": "Melodica",
-    "type": "string"
-  },
-  {
-    "const": "Tabla",
-    "type": "string"
-  },
-  {
-    "const": "Koto",
-    "type": "string"
-  },
-  {
-    "const": "Djembe",
-    "type": "string"
-  },
-  {
-    "const": "Taiko",
-    "type": "string"
-  },
-  {
-    "const": "Didgeridoo",
-    "type": "string"
-  }
-]
    • changedInput schema / properties / stem_name / description
      Previous value: -"Target stem for advanced separation. Required when type is split_stem_advanced."New value: +"Target stem for advanced separation. Required when type is split_stem_advanced. Declared type: string. Known values: \"Lead Vocal\", \"Drum Kit\", \"Kick\", \"Snare\", \"Risers\", \"Bass\", \"Backing Vocals\", \"Piano\", \"Electric Guitar\", \"Percussion\", \"String Section\", \"Synth\", \"Acoustic Guitar\", \"Sound Effects\", \"Synth Pad\", \"Synth Bass\", \"Guitar\", \"Brass Section\", \"Organ\", \"Electronic Drum Kit\", \"Lead Electric Guitar\", \"Synth Keys\", \"Rhythm Electric Guitar\", \"Electric Piano\", \"Upright Bass\", \"Keyboards\", \"Distorted Electric Guitar\", \"Synth Strings\", \"Synth Lead\", \"Woodwinds\", \"Rhythm Acoustic Guitar\", \"Flute\", \"Harp\", \"Tambourine\", \"Trumpet\", \"Arpeggiator\", \"Accordion\", \"Fiddle\", \"Pedal Steel Guitar\", \"Synth Voice\", \"Violin\", \"Digital Piano\", \"Synth Brass\", \"Mandolin\", \"Choir\", \"Banjo\", \"Bells\", \"Clarinet\", \"Tenor Saxophone\", \"Trombone\", \"Shaker\", \"French Horn\", \"Glockenspiel\", \"Electric Bass\", \"Cello\", \"Timpani\", \"Harmonica\", \"Marimba\", \"Vibraphone\", \"Lap Steel Guitar\", \"Saxophone\", \"Orchestra\", \"Horns\", \"Cymbals\", \"Hand Clap\", \"Oboe\", \"Celesta\", \"Congas\", \"Drone\", \"Alto Saxophone\", \"Double Bass\", \"Ukulele\", \"Harpsichord\", \"Baritone Saxophone\", \"Xylophone\", \"Tuba\", \"Bass Guitar\", \"Whistle\", \"Lead Guitar\", \"Rhodes\", \"808\", \"Bongos\", \"Bassoon\", \"Cowbell\", \"Viola\", \"Sitar\", \"Steel Drums\", \"Piccolo\", \"Theremin\", \"Bagpipes\", \"Hi-Hat\", \"Music Box\", \"Melodica\", \"Tabla\", \"Koto\", \"Djembe\", \"Taiko\", \"Didgeridoo\"."
    • addedInput schema / properties / stem_name / type
      Added value: +"string"
    • changedInput schema / properties / task_id / description
      Previous value: -"Source task ID."New value: +"Source task ID. Declared type: string."
    • removedInput schema / properties / type / anyOf
      Removed value: -[
-  {
-    "const": "separate_vocal",
-    "type": "string"
-  },
-  {
-    "const": "split_stem",
-    "type": "string"
-  },
-  {
-    "const": "split_stem_advanced",
-    "type": "string"
-  }
-]
    • changedInput schema / properties / type / description
      Previous value: -"Stem separation mode."New value: +"Stem separation mode. Declared type: string. Known values: \"separate_vocal\", \"split_stem\", \"split_stem_advanced\"."
    • addedInput schema / properties / type / type
      Added value: +"string"
  2. Changed9 schema fields changedv0.3.2
    • removedInput schema / additionalProperties
      Removed value: -false
    • addedInput schema / properties / poll_interval_ms / maximum
      Added value: +9007199254740991
    • addedInput schema / properties / stem_name / anyOf
      Added value: +[
+  {
+    "const": "Lead Vocal",
+    "type": "string"
+  },
+  {
+    "const": "Drum Kit",
+    "type": "string"
+  },
+  {
+    "const": "Kick",
+    "type": "string"
+  },
+  {
+    "const": "Snare",
+    "type": "string"
+  },
+  {
+    "const": "Risers",
+    "type": "string"
+  },
+  {
+    "const": "Bass",
+    "type": "string"
+  },
+  {
+    "const": "Backing Vocals",
+    "type": "string"
+  },
+  {
+    "const": "Piano",
+    "type": "string"
+  },
+  {
+    "const": "Electric Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Percussion",
+    "type": "string"
+  },
+  {
+    "const": "String Section",
+    "type": "string"
+  },
+  {
+    "const": "Synth",
+    "type": "string"
+  },
+  {
+    "const": "Acoustic Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Sound Effects",
+    "type": "string"
+  },
+  {
+    "const": "Synth Pad",
+    "type": "string"
+  },
+  {
+    "const": "Synth Bass",
+    "type": "string"
+  },
+  {
+    "const": "Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Brass Section",
+    "type": "string"
+  },
+  {
+    "const": "Organ",
+    "type": "string"
+  },
+  {
+    "const": "Electronic Drum Kit",
+    "type": "string"
+  },
+  {
+    "const": "Lead Electric Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Synth Keys",
+    "type": "string"
+  },
+  {
+    "const": "Rhythm Electric Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Electric Piano",
+    "type": "string"
+  },
+  {
+    "const": "Upright Bass",
+    "type": "string"
+  },
+  {
+    "const": "Keyboards",
+    "type": "string"
+  },
+  {
+    "const": "Distorted Electric Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Synth Strings",
+    "type": "string"
+  },
+  {
+    "const": "Synth Lead",
+    "type": "string"
+  },
+  {
+    "const": "Woodwinds",
+    "type": "string"
+  },
+  {
+    "const": "Rhythm Acoustic Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Flute",
+    "type": "string"
+  },
+  {
+    "const": "Harp",
+    "type": "string"
+  },
+  {
+    "const": "Tambourine",
+    "type": "string"
+  },
+  {
+    "const": "Trumpet",
+    "type": "string"
+  },
+  {
+    "const": "Arpeggiator",
+    "type": "string"
+  },
+  {
+    "const": "Accordion",
+    "type": "string"
+  },
+  {
+    "const": "Fiddle",
+    "type": "string"
+  },
+  {
+    "const": "Pedal Steel Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Synth Voice",
+    "type": "string"
+  },
+  {
+    "const": "Violin",
+    "type": "string"
+  },
+  {
+    "const": "Digital Piano",
+    "type": "string"
+  },
+  {
+    "const": "Synth Brass",
+    "type": "string"
+  },
+  {
+    "const": "Mandolin",
+    "type": "string"
+  },
+  {
+    "const": "Choir",
+    "type": "string"
+  },
+  {
+    "const": "Banjo",
+    "type": "string"
+  },
+  {
+    "const": "Bells",
+    "type": "string"
+  },
+  {
+    "const": "Clarinet",
+    "type": "string"
+  },
+  {
+    "const": "Tenor Saxophone",
+    "type": "string"
+  },
+  {
+    "const": "Trombone",
+    "type": "string"
+  },
+  {
+    "const": "Shaker",
+    "type": "string"
+  },
+  {
+    "const": "French Horn",
+    "type": "string"
+  },
+  {
+    "const": "Glockenspiel",
+    "type": "string"
+  },
+  {
+    "const": "Electric Bass",
+    "type": "string"
+  },
+  {
+    "const": "Cello",
+    "type": "string"
+  },
+  {
+    "const": "Timpani",
+    "type": "string"
+  },
+  {
+    "const": "Harmonica",
+    "type": "string"
+  },
+  {
+    "const": "Marimba",
+    "type": "string"
+  },
+  {
+    "const": "Vibraphone",
+    "type": "string"
+  },
+  {
+    "const": "Lap Steel Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Saxophone",
+    "type": "string"
+  },
+  {
+    "const": "Orchestra",
+    "type": "string"
+  },
+  {
+    "const": "Horns",
+    "type": "string"
+  },
+  {
+    "const": "Cymbals",
+    "type": "string"
+  },
+  {
+    "const": "Hand Clap",
+    "type": "string"
+  },
+  {
+    "const": "Oboe",
+    "type": "string"
+  },
+  {
+    "const": "Celesta",
+    "type": "string"
+  },
+  {
+    "const": "Congas",
+    "type": "string"
+  },
+  {
+    "const": "Drone",
+    "type": "string"
+  },
+  {
+    "const": "Alto Saxophone",
+    "type": "string"
+  },
+  {
+    "const": "Double Bass",
+    "type": "string"
+  },
+  {
+    "const": "Ukulele",
+    "type": "string"
+  },
+  {
+    "const": "Harpsichord",
+    "type": "string"
+  },
+  {
+    "const": "Baritone Saxophone",
+    "type": "string"
+  },
+  {
+    "const": "Xylophone",
+    "type": "string"
+  },
+  {
+    "const": "Tuba",
+    "type": "string"
+  },
+  {
+    "const": "Bass Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Whistle",
+    "type": "string"
+  },
+  {
+    "const": "Lead Guitar",
+    "type": "string"
+  },
+  {
+    "const": "Rhodes",
+    "type": "string"
+  },
+  {
+    "const": "808",
+    "type": "string"
+  },
+  {
+    "const": "Bongos",
+    "type": "string"
+  },
+  {
+    "const": "Bassoon",
+    "type": "string"
+  },
+  {
+    "const": "Cowbell",
+    "type": "string"
+  },
+  {
+    "const": "Viola",
+    "type": "string"
+  },
+  {
+    "const": "Sitar",
+    "type": "string"
+  },
+  {
+    "const": "Steel Drums",
+    "type": "string"
+  },
+  {
+    "const": "Piccolo",
+    "type": "string"
+  },
+  {
+    "const": "Theremin",
+    "type": "string"
+  },
+  {
+    "const": "Bagpipes",
+    "type": "string"
+  },
+  {
+    "const": "Hi-Hat",
+    "type": "string"
+  },
+  {
+    "const": "Music Box",
+    "type": "string"
+  },
+  {
+    "const": "Melodica",
+    "type": "string"
+  },
+  {
+    "const": "Tabla",
+    "type": "string"
+  },
+  {
+    "const": "Koto",
+    "type": "string"
+  },
+  {
+    "const": "Djembe",
+    "type": "string"
+  },
+  {
+    "const": "Taiko",
+    "type": "string"
+  },
+  {
+    "const": "Didgeridoo",
+    "type": "string"
+  }
+]
    • removedInput schema / properties / stem_name / enum
      Removed value: -[
-  "Lead Vocal",
-  "Drum Kit",
-  "Kick",
-  "Snare",
-  "Risers",
-  "Bass",
-  "Backing Vocals",
-  "Piano",
-  "Electric Guitar",
-  "Percussion",
-  "String Section",
-  "Synth",
-  "Acoustic Guitar",
-  "Sound Effects",
-  "Synth Pad",
-  "Synth Bass",
-  "Guitar",
-  "Brass Section",
-  "Organ",
-  "Electronic Drum Kit",
-  "Lead Electric Guitar",
-  "Synth Keys",
-  "Rhythm Electric Guitar",
-  "Electric Piano",
-  "Upright Bass",
-  "Keyboards",
-  "Distorted Electric Guitar",
-  "Synth Strings",
-  "Synth Lead",
-  "Woodwinds",
-  "Rhythm Acoustic Guitar",
-  "Flute",
-  "Harp",
-  "Tambourine",
-  "Trumpet",
-  "Arpeggiator",
-  "Accordion",
-  "Fiddle",
-  "Pedal Steel Guitar",
-  "Synth Voice",
-  "Violin",
-  "Digital Piano",
-  "Synth Brass",
-  "Mandolin",
-  "Choir",
-  "Banjo",
-  "Bells",
-  "Clarinet",
-  "Tenor Saxophone",
-  "Trombone",
-  "Shaker",
-  "French Horn",
-  "Glockenspiel",
-  "Electric Bass",
-  "Cello",
-  "Timpani",
-  "Harmonica",
-  "Marimba",
-  "Vibraphone",
-  "Lap Steel Guitar",
-  "Saxophone",
-  "Orchestra",
-  "Horns",
-  "Cymbals",
-  "Hand Clap",
-  "Oboe",
-  "Celesta",
-  "Congas",
-  "Drone",
-  "Alto Saxophone",
-  "Double Bass",
-  "Ukulele",
-  "Harpsichord",
-  "Baritone Saxophone",
-  "Xylophone",
-  "Tuba",
-  "Bass Guitar",
-  "Whistle",
-  "Lead Guitar",
-  "Rhodes",
-  "808",
-  "Bongos",
-  "Bassoon",
-  "Cowbell",
-  "Viola",
-  "Sitar",
-  "Steel Drums",
-  "Piccolo",
-  "Theremin",
-  "Bagpipes",
-  "Hi-Hat",
-  "Music Box",
-  "Melodica",
-  "Tabla",
-  "Koto",
-  "Djembe",
-  "Taiko",
-  "Didgeridoo"
-]
    • removedInput schema / properties / stem_name / type
      Removed value: -"string"
    • addedInput schema / properties / timeout_ms / maximum
      Added value: +9007199254740991
    • addedInput schema / properties / type / anyOf
      Added value: +[
+  {
+    "const": "separate_vocal",
+    "type": "string"
+  },
+  {
+    "const": "split_stem",
+    "type": "string"
+  },
+  {
+    "const": "split_stem_advanced",
+    "type": "string"
+  }
+]
    • removedInput schema / properties / type / enum
      Removed value: -[
-  "separate_vocal",
-  "split_stem",
-  "split_stem_advanced"
-]
    • removedInput schema / properties / type / type
      Removed value: -"string"
  3. Addedv0.2.4

TDQS

C2.9/5.0
Behavior2/5

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

With no annotations, the description carries the full burden. It states the tool returns a task id, status, and output URLs, which is useful, but omits that this is an async task-creation call, how polling/`wait` behaves, whether it costs credits, or any auth requirements.

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 with the action and the return shape front-loaded; there is no filler. It is efficient, though terse to the point of under-informing.

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?

For an 8-parameter, async task-creation tool with no annotations and no output schema, the description is thin. It never explains the relationship between task_id/audio_id inputs, the wait/callback_url/poll_interval_ms control trio, or what the returned task id is used for.

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 75%, so the schema already documents most parameters (including the large enum of stem_name values), making 3 the baseline. The description itself adds no parameter meaning; timeout_ms and poll_interval_ms remain undocumented in both places.

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 names a specific verb and resource ('Create a Suno task ... separate audio stems'), so an agent knows this initiates stem separation rather than conversion or remastering. It is clear but does not explicitly contrast itself with siblings like convert_audio or remaster_audio.

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

Usage Guidelines2/5

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

There is no when-to-use guidance, no mention of prerequisites, and no routing to alternatives among the many audio siblings. The agent must infer that it needs an existing source task and audio to operate on.

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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