List all carriers currently configured in the system.
AI agents call list_supported_carriers to retrieve information from Carrier Accounting MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves configuration metadata (list of supported carriers) from the system without modifying, executing against, or deleting any data. It is a read-only operation with minimal blast radius; misuse by an AI agent would only expose the names of configured carriers, not financial data or system controls.
From the tool's definition Tool name is 'list_supported_carriers' and description states it 'List all carriers currently configured in the system' — a pure query/retrieval operation with no side effects.
Attacks that exploit this kind of access
List all carriers currently configured in the system. It is categorised as a Read tool in the Carrier Accounting MCP MCP Server, which means it retrieves data without modifying state.
Register the Carrier Accounting MCP server in PolicyLayer and add a rule for list_supported_carriers: 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 Carrier Accounting MCP. Nothing to install.
list_supported_carriers 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 list_supported_carriers 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 list_supported_carriers. 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.
list_supported_carriers is provided by the Carrier Accounting MCP server (pramodmisra/carrier-accounting-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.
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