Sends SMS or MMS messages. MMS is supported for U.S. numbers only. Rate limit: 20 messages per phone number in 24 hours.
Risk signalsAccepts URL/endpoint input (callback_url)
Part of the Wavix server.
Free to start. No card required.
AI agents use sms_and_mms_messages_send to create or modify resources in Wavix. 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 sms_and_mms_messages_send 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 Wavix.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"sms_and_mms_messages_send": {
"limits": [
{
"counter": "sms_and_mms_messages_send_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Wavix policy for all 122 tools.
These attack patterns abuse exactly the kind of access sms_and_mms_messages_send 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.
Sends SMS or MMS messages. MMS is supported for U.S. numbers only. Rate limit: 20 messages per phone number in 24 hours.. It is categorised as a Write tool in the Wavix MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Wavix MCP server in PolicyLayer and add a rule for sms_and_mms_messages_send: 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 Wavix. Nothing to install.
sms_and_mms_messages_send 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 sms_and_mms_messages_send 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 sms_and_mms_messages_send. 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.
sms_and_mms_messages_send is provided by the Wavix MCP server (https://mcp.wavix.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 122 Wavix tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.