separate_song_stems

Stem Separation. Spends ElevenLabs credits. Returns application/zip bytes; pass output_path to save them.

SERVERElevenlabs SOURCE@aiwerk/mcp-server-elevenlabs

Medium RISK CLASS

Category Write

Parameters 70 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aiwerk-mcp-server-elevenlabs/separate-song-stems.md

WHAT IT DOES

What separate_song_stems does on Elevenlabs

AI agents use separate_song_stems to create or update resources in Elevenlabs, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Elevenlabs environment.

Parameter	Type	Required	Description
`file_path`	string	—	The audio file to separate into stems. Local path. Required for this call.
`file_base64`	string	—	Base64 contents for "file". Use this when the server cannot read your local disk.
`output_path`	string	—	Where to write the returned bytes. Relative paths resolve against ELEVENLABS_OUTPUT_DIR. Omit it to get the data inline as base64 (small files only).
`file_filename`	string	—	Filename to send for "file". Some endpoints infer the audio format from it.
`output_format`	string	—	Output format of the generated audio. Formatted as codec_sample_rate_bitrate. So an mp3 with 22.05kHz sample rate at 32kbs is represented as mp3_22050_32. MP3 w
`sign_with_c2pa`	boolean	—	Whether to sign the generated song with C2PA. Applicable only for mp3 files.
`stem_variation_id`	string	—	The id of the stem variation to use.

Parameters from the server's own tool schema.

RISK

Why separate_song_stems is rated Medium

An AI agent can call separate_song_stems faster than any human can review: one bad instruction and it creates or modifies resources in Elevenlabs by the hundred, each call as confident as the last.

Risk signalsAccepts file system path (file_path)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs separate_song_stems safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Elevenlabs, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For separate_song_stems, this is the rule to start with:

separate_song_stems Rate-limited

separate_song_stems stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "separate_song_stems": {
      "limits": [
        {
          "counter": "separate_song_stems_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Elevenlabs, apply this rule, and every separate_song_stems call is checked against it from then on.

FAQ

Questions about separate_song_stems

What does the separate_song_stems tool do? +

Stem Separation. Spends ElevenLabs credits. Returns application/zip bytes; pass output_path to save them. It is categorised as a Write tool in the Elevenlabs MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does separate_song_stems accept? +

separate_song_stems accepts 7 parameters: file_path, file_base64, output_path, file_filename, output_format, sign_with_c2pa, stem_variation_id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on separate_song_stems? +

Register the Elevenlabs MCP server in PolicyLayer and add a rule for separate_song_stems: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Elevenlabs. Nothing to install.

What risk level is separate_song_stems? +

separate_song_stems is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit separate_song_stems? +

Yes. Add a rate_limit block to the separate_song_stems rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block separate_song_stems completely? +

Set action: deny in the PolicyLayer policy for separate_song_stems. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides separate_song_stems? +

separate_song_stems is provided by the Elevenlabs MCP server (@aiwerk/mcp-server-elevenlabs). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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