update_phone_number_messaging_settings

THE RISK

Medium Risk

Why update_phone_number_messaging_settings needs a policy

This tool creates or modifies data reversibly (update pattern). It changes messaging settings associated with a phone number, which is a configuration change that can be undone or modified again. While the description is empty, the tool name and server context clearly indicate a write operation.

From the tool's definition Tool name 'update_phone_number_messaging_settings' indicates modification of configuration settings for phone number messaging. The 'update' verb denotes a write operation that alters existing data.

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

POLICY

How to control update_phone_number_messaging_settings

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

policy.json

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

update_phone_number_messaging_settings 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 Telnyx 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.

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EXPLORE

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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 update_phone_number_messaging_settings

What does the update_phone_number_messaging_settings tool do? +

update_phone_number_messaging_settings. It is categorised as a Write tool in the Telnyx 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 update_phone_number_messaging_settings? +

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

What risk level is update_phone_number_messaging_settings? +

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

Can I rate-limit update_phone_number_messaging_settings? +

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

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

update_phone_number_messaging_settings is provided by the Telnyx MCP Server MCP server (team-telnyx/telnyx-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 Telnyx MCP Server tool call.

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

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