add_attachments_to_set

THE RISK

Medium Risk

Why add_attachments_to_set needs a policy

The 'add' operation typically creates or modifies data structures reversibly. Without a detailed description, confidence is moderate. This is classified as Write rather than Read (due to 'add' action) or Destructive (no indication of irreversible deletion). The severity is medium because unintended attachment of data could cause operational issues but is generally reversible.

From the tool's definition Tool name 'add_attachments_to_set' indicates creation or modification of data by attaching items to a set.

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

POLICY

How to control add_attachments_to_set

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "add_attachments_to_set": {
      "limits": [
        {
          "counter": "add_attachments_to_set_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

add_attachments_to_set 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.

Create a free account and register Prometheus MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 805 Prometheus MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about add_attachments_to_set

What does the add_attachments_to_set tool do? +

add_attachments_to_set. It is categorised as a Write tool in the Prometheus MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_attachments_to_set? +

Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for add_attachments_to_set: 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 Prometheus MCP Server. Nothing to install.

What risk level is add_attachments_to_set? +

add_attachments_to_set is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit add_attachments_to_set? +

Yes. Add a rate_limit block to the add_attachments_to_set 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 add_attachments_to_set completely? +

Set action: deny in the PolicyLayer policy for add_attachments_to_set. 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 add_attachments_to_set? +

add_attachments_to_set is provided by the Prometheus MCP Server MCP server (awslabs.prometheus-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 Prometheus MCP Server tool call.

Start from Prometheus MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →