Use this to list subscribers with optional filters and pagination. Good for fleet enumeration, bulk status checks, and finding subscribers by account or status. Params: accountId (integer, filter by account), status (string, e.g. 'ACTIVE'/'SUSPENDED'), offset (integer, for pagination — default 0)...
Part of the Carrier MCP: Give Your AI Agent Global Connectivity server.
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AI agents call list_subscribers to retrieve information from Carrier MCP: Give Your AI Agent Global Connectivity without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though list_subscribers only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"list_subscribers": {}
}
}See the full Carrier MCP: Give Your AI Agent Global Connectivity policy for all 65 tools.
These attack patterns abuse exactly the kind of access list_subscribers gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Use this to list subscribers with optional filters and pagination. Good for fleet enumeration, bulk status checks, and finding subscribers by account or status. Params: accountId (integer, filter by account), status (string, e.g. 'ACTIVE'/'SUSPENDED'), offset (integer, for pagination — default 0), limit (integer, max results — always set to avoid unbounded fetches; recommended max 100 per call). Returns: array of subscriber summary records with ICCID, status, and account. Do NOT use this to fetch full details for a specific subscriber — use get_subscriber for that.. It is categorised as a Read tool in the Carrier MCP: Give Your AI Agent Global Connectivity MCP Server, which means it retrieves data without modifying state.
Register the Carrier MCP: Give Your AI Agent Global Connectivity MCP server in PolicyLayer and add a rule for list_subscribers: 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 Carrier MCP: Give Your AI Agent Global Connectivity. Nothing to install.
list_subscribers 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 list_subscribers 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 list_subscribers. 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.
list_subscribers is provided by the Carrier MCP: Give Your AI Agent Global Connectivity MCP server (carrier/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 65 Carrier MCP: Give Your AI Agent Global Connectivity tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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