Low Risk

get_receivers

Get list of all receivers (name of notification integrations)

How to control get_receivers ↓

What get_receivers does on Alertmanager

AI agents call get_receivers to retrieve information from Alertmanager without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

Low Risk

Why get_receivers needs a policy

This tool retrieves configuration metadata about alert receivers without any side effects or state changes. It is purely informational and poses minimal risk even if called by a compromised agent, as it only exposes the names of existing notification integrations without exposing their credentials or triggering any actions.

From the tool's definition Tool name and description both indicate a retrieval-only operation: 'Get list of all receivers' with no mutation capability. The tool queries notification integrations but does not create, modify, or delete them.

Documented attack patterns abuse exactly the kind of access get_receivers gives an agent:

How to control get_receivers

PolicyLayer is an MCP gateway — it sits between your AI agents and Alertmanager, and nothing reaches the server without passing your rules. This is the rule we recommend for get_receivers:

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_receivers": {}
  }
}

get_receivers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

  1. Create a free account and register Alertmanager — nothing to install.
  2. Add this policy — paste it, or build it visually.
  3. Point your MCP client (Claude, Cursor, anything) at your gateway URL.
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Related tools and policies

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Questions about get_receivers

What does the get_receivers tool do? +

Get list of all receivers (name of notification integrations). It is categorised as a Read tool in the Alertmanager MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_receivers? +

Register the Alertmanager MCP server in PolicyLayer and add a rule for get_receivers: 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 Alertmanager. Nothing to install.

What risk level is get_receivers? +

get_receivers is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_receivers? +

Yes. Add a rate_limit block to the get_receivers 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.

How do I block get_receivers completely? +

Set action: deny in the PolicyLayer policy for get_receivers. 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.

What MCP server provides get_receivers? +

get_receivers is provided by the Alertmanager MCP server (ntk148v/alertmanager-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Alertmanager tool call.

Start from Alertmanager, 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.

9 Alertmanager tools catalogued and risk-classified — across an index of 43,000+ MCP servers.

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