Get the list of supported carriers and their codes
AI agents call get_supported_carriers to retrieve information from Parcel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves a static or semi-static list of supported carriers and their codes. It performs a read-only query with no side effects, no data modification, and no external operations triggered. The information returned is lookup/reference data typically used to inform other operations.
From the tool's definition Tool name 'get_supported_carriers' and description 'Get the list of supported carriers and their codes' indicate a query operation that retrieves reference data without modifying any state.
Attacks that exploit this kind of access
Get the list of supported carriers and their codes. It is categorised as a Read tool in the Parcel MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Parcel MCP Server MCP server in PolicyLayer and add a rule for get_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 Parcel MCP Server. Nothing to install.
get_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 get_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 get_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.
get_supported_carriers is provided by the Parcel MCP Server MCP server (nova-3951/parcel-api-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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