Retrieves basic information about a mobile number (requestedNumber, formattedNumber, numberType, isPossible, isValid, regionCode, isValidNumberForRegion, network, originalNetwork, roaming, ported, country, countryPrefix, details)
AI agents call check_mobile_start to retrieve information from Openapi Mcp Sdk without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a read-only lookup operation that queries data about a phone number without creating, modifying, or deleting any information. However, severity is elevated to 'medium' rather than 'low' because phone number validation and carrier/network information retrieval could enable reconnaissance for targeted attacks, spam campaigns, or privacy violations if misused by an agent without proper controls.
From the tool's definition Tool 'check_mobile_start' retrieves basic information about a mobile number including numberType, isPossible, isValid, regionCode, network, roaming, and country data.
Documented attack patterns abuse exactly the kind of access check_mobile_start gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Openapi Mcp Sdk, and nothing reaches the server without passing your rules. This is the rule we recommend for check_mobile_start:
{
"version": "1",
"default": "deny",
"tools": {
"check_mobile_start": {}
}
}check_mobile_start is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieves basic information about a mobile number (requestedNumber, formattedNumber, numberType, isPossible, isValid, regionCode, isValidNumberForRegion, network, originalNetwork, roaming, ported, country, countryPrefix, details). It is categorised as a Read tool in the Openapi Mcp Sdk MCP Server, which means it retrieves data without modifying state.
Register the Openapi Mcp Sdk MCP server in PolicyLayer and add a rule for check_mobile_start: 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 Openapi Mcp Sdk. Nothing to install.
check_mobile_start 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 check_mobile_start 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 check_mobile_start. 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.
check_mobile_start is provided by the Openapi Mcp Sdk MCP server (openapi/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Openapi Mcp Sdk, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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41 Openapi Mcp Sdk tools catalogued and risk-classified — across an index of 43,000+ MCP servers.