Set the volume level of VLC (0-200, where 100 is normal volume).
AI agents use set_volume to create or update resources in Vlc — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vlc environment.
This tool creates or modifies application state (volume level) without irreversible consequences. The user can easily undo the change by setting a different volume value. It does not retrieve data (Read), execute arbitrary code (Execute), permanently delete anything (Destructive), or involve financial transactions (Financial).
From the tool's definition Tool name is 'set_volume' and description states 'Set the volume level of VLC (0-200, where 100 is normal volume)'. This modifies VLC's volume setting, which is a reversible state change.
Documented attack patterns abuse exactly the kind of access set_volume gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vlc, and nothing reaches the server without passing your rules. This is the rule we recommend for set_volume:
{
"version": "1",
"default": "deny",
"tools": {
"set_volume": {
"limits": [
{
"counter": "set_volume_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}set_volume 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.
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Set the volume level of VLC (0-200, where 100 is normal volume). It is categorised as a Write tool in the Vlc MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vlc MCP server in PolicyLayer and add a rule for set_volume: 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 Vlc. Nothing to install.
set_volume is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the set_volume 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.
Set action: deny in the PolicyLayer policy for set_volume. 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.
set_volume is provided by the Vlc MCP server (piebro/vlc-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Vlc, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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8 Vlc tools catalogued and risk-classified — across an index of 43,000+ MCP servers.