AI agents call notify_list_providers to retrieve information from Claude Voice Notify without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a list of available voice notification providers. It performs a read-only operation that retrieves configuration/availability data without modifying, executing, or destructing anything. No external operations are triggered by the arguments, and there is no financial impact. This is a straightforward informational lookup.
From the tool's definition Tool name 'notify_list_providers' and description '利用可能な音声プロバイダーの一覧を表示する' (Display a list of available voice providers) indicate retrieval of provider information with no side effects.
Documented attack patterns abuse exactly the kind of access notify_list_providers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Claude Voice Notify, and nothing reaches the server without passing your rules. This is the rule we recommend for notify_list_providers:
{
"version": "1",
"default": "deny",
"tools": {
"notify_list_providers": {}
}
}notify_list_providers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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利用可能な音声プロバイダーの一覧を表示する。. It is categorised as a Read tool in the Claude Voice Notify MCP Server, which means it retrieves data without modifying state.
Register the Claude Voice Notify MCP server in PolicyLayer and add a rule for notify_list_providers: 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 Claude Voice Notify. Nothing to install.
notify_list_providers is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the notify_list_providers 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 notify_list_providers. 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.
notify_list_providers is provided by the Claude Voice Notify MCP server (kubouchiyuya/claude-voice-notify). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Claude Voice Notify, 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.
5 Claude Voice Notify tools catalogued and risk-classified — across an index of 43,000+ MCP servers.