Send a WhatsApp text message with automatic SMS failover using the Vonage Messages API failover feature
Part of the Vonage Mcp Server Api Bindings server.
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AI agents use whatsapp-send-text-with-sms-failover to create or modify resources in Vonage Mcp Server Api Bindings. 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 whatsapp-send-text-with-sms-failover 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 Vonage Mcp Server Api Bindings.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"whatsapp-send-text-with-sms-failover": {
"limits": [
{
"counter": "whatsapp-send-text-with-sms-failover_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Vonage Mcp Server Api Bindings policy for all 13 tools.
These attack patterns abuse exactly the kind of access whatsapp-send-text-with-sms-failover 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.
Send a WhatsApp text message with automatic SMS failover using the Vonage Messages API failover feature. It is categorised as a Write tool in the Vonage Mcp Server Api Bindings MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vonage Mcp Server Api Bindings MCP server in PolicyLayer and add a rule for whatsapp-send-text-with-sms-failover: 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 Vonage Mcp Server Api Bindings. Nothing to install.
whatsapp-send-text-with-sms-failover 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 whatsapp-send-text-with-sms-failover 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 whatsapp-send-text-with-sms-failover. 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.
whatsapp-send-text-with-sms-failover is provided by the Vonage Mcp Server Api Bindings MCP server (@vonage/vonage-mcp-server-api-bindings). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 13 Vonage Mcp Server Api Bindings tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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