Sync indexers to all connected applications
AI agents invoke prowlarr_sync_apps to trigger actions in Arr Suite MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool initiates an active synchronization process that pushes indexer configurations to all connected applications (Sonarr, Radarr, etc.). It's not a simple read or write to a single resource, but rather triggers an operation with effects across multiple external systems.
From the tool's definition 'Sync indexers to all connected applications' — triggers an external synchronization operation across multiple connected services
Documented attack patterns abuse exactly the kind of access prowlarr_sync_apps gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Arr Suite MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for prowlarr_sync_apps:
{
"version": "1",
"default": "deny",
"tools": {
"prowlarr_sync_apps": {
"limits": [
{
"counter": "prowlarr_sync_apps_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}prowlarr_sync_apps stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Sync indexers to all connected applications. It is categorised as a Execute tool in the Arr Suite MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Arr Suite MCP Server MCP server in PolicyLayer and add a rule for prowlarr_sync_apps: 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 Arr Suite MCP Server. Nothing to install.
prowlarr_sync_apps is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the prowlarr_sync_apps 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 prowlarr_sync_apps. 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.
prowlarr_sync_apps is provided by the Arr Suite MCP Server MCP server (shaktech786/arr-suite-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Arr Suite MCP Server, 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.
25 Arr Suite MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.