AI agents call get_available_numbers to retrieve information from Seven without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about available phone numbers without modifying, deleting, or executing any operations. It is a read-only query operation with minimal blast radius if misused by an AI agent—the worst outcome would be unnecessary API calls or information disclosure about available numbers.
From the tool's definition Tool name 'get_available_numbers' and description 'List available phone numbers for purchase' indicate data retrieval with no side effects. The verb 'list' and action of querying available inventory are characteristic Read operations.
Attacks that exploit this kind of access
List available phone numbers for purchase. It is categorised as a Read tool in the Seven MCP Server, which means it retrieves data without modifying state.
Register the Seven MCP server in PolicyLayer and add a rule for get_available_numbers: 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 Seven. Nothing to install.
get_available_numbers 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 get_available_numbers 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 get_available_numbers. 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.
get_available_numbers is provided by the Seven MCP server (seven-io/seven-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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