AI agents use bark_send_notify to create or update resources in Notify MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Notify MCP Server environment.
Sending notifications creates data in an external system (notification sent to recipient), which is a write operation. It does not execute arbitrary code, delete data, or move money. Severity is medium because misuse could spam users or send unwanted notifications, but impact is generally limited to notification delivery without destructive consequences.
From the tool's definition Tool name 'bark_send_notify' and description '通过Bark推送通知' (send notification via Bark) indicate the tool sends/pushes notifications to a service.
Documented attack patterns abuse exactly the kind of access bark_send_notify gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Notify MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for bark_send_notify:
{
"version": "1",
"default": "deny",
"tools": {
"bark_send_notify": {
"limits": [
{
"counter": "bark_send_notify_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}bark_send_notify 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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通过Bark推送通知. It is categorised as a Write tool in the Notify MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Notify MCP Server MCP server in PolicyLayer and add a rule for bark_send_notify: 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 Notify MCP Server. Nothing to install.
bark_send_notify 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 bark_send_notify 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 bark_send_notify. 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.
bark_send_notify is provided by the Notify MCP Server MCP server (oci:ghcr.io/aahl/mcp-notify:latest). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Notify 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.
21 Notify MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.