Enable or disable crossfade between tracks. Crossfade creates smooth transitions between songs.
AI agents use sonos_set_crossfade to create or update resources in Sonos Ts — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Sonos Ts environment.
This tool creates or modifies device settings (crossfade preference) reversibly without irreversible data loss, side effects on other systems, financial impact, or code execution. It fits the Write category as a straightforward configuration update. Severity is low because misuse would only affect audio playback preferences on a single local device with no broader impact.
From the tool's definition The tool 'sonos_set_crossfade' modifies playback settings by enabling or disabling crossfade, which changes the audio device configuration state.
Documented attack patterns abuse exactly the kind of access sonos_set_crossfade gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sonos Ts, and nothing reaches the server without passing your rules. This is the rule we recommend for sonos_set_crossfade:
{
"version": "1",
"default": "deny",
"tools": {
"sonos_set_crossfade": {
"limits": [
{
"counter": "sonos_set_crossfade_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}sonos_set_crossfade 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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Enable or disable crossfade between tracks. Crossfade creates smooth transitions between songs. It is categorised as a Write tool in the Sonos Ts MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Sonos Ts MCP server in PolicyLayer and add a rule for sonos_set_crossfade: 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 Sonos Ts. Nothing to install.
sonos_set_crossfade 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 sonos_set_crossfade 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 sonos_set_crossfade. 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.
sonos_set_crossfade is provided by the Sonos Ts MCP server (tommertom/sonos-ts-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Sonos Ts, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
60 Sonos Ts tools catalogued and risk-classified — across an index of 43,000+ MCP servers.