Use this to assign a phone number (MSISDN) to a subscriber. Supports both fake/test MSISDNs and real production MSISDNs via the phone_type parameter. Required for MSISDN assignment workflows before activating voice services. Params: iccid (subscriber identifier), phone_number (E.164 format, e.g. ...
Part of the Carrier MCP: Give Your AI Agent Global Connectivity server.
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AI agents use affect_subscriber_phone_number to create or modify resources in Carrier MCP: Give Your AI Agent Global Connectivity. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call affect_subscriber_phone_number repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Carrier MCP: Give Your AI Agent Global Connectivity.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"affect_subscriber_phone_number": {
"limits": [
{
"counter": "affect_subscriber_phone_number_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}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 affect_subscriber_phone_number gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Use this to assign a phone number (MSISDN) to a subscriber. Supports both fake/test MSISDNs and real production MSISDNs via the phone_type parameter. Required for MSISDN assignment workflows before activating voice services. Params: iccid (subscriber identifier), phone_number (E.164 format, e.g. +31612345678), phone_type ('fake' for test/dev, 'real' for production). Returns: updated subscriber record with the new MSISDN. Do NOT use this to check a subscriber's current MSISDN — use get_subscriber instead.. It is categorised as a Write tool in the Carrier MCP: Give Your AI Agent Global Connectivity MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Carrier MCP: Give Your AI Agent Global Connectivity MCP server in PolicyLayer and add a rule for affect_subscriber_phone_number: 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.
affect_subscriber_phone_number 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 affect_subscriber_phone_number 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 affect_subscriber_phone_number. 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.
affect_subscriber_phone_number 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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