Use this to list all sponsor networks (eSIM sponsor carriers) available to this reseller. A sponsor defines which physical network infrastructure backs a given eSIM profile. Params: resellerId (integer, optional — omit to use the token owner's reseller). Returns: array of sponsor records with spo...
Part of the Carrier MCP: Give Your AI Agent Global Connectivity server.
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AI agents call list_sponsors to retrieve information from Carrier MCP: Give Your AI Agent Global Connectivity without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though list_sponsors only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"list_sponsors": {}
}
}See the full Carrier MCP: Give Your AI Agent Global Connectivity policy for all 65 tools.
These attack patterns abuse exactly the kind of access list_sponsors gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
Use this to list all sponsor networks (eSIM sponsor carriers) available to this reseller. A sponsor defines which physical network infrastructure backs a given eSIM profile. Params: resellerId (integer, optional — omit to use the token owner's reseller). Returns: array of sponsor records with sponsorId, name, and coverage metadata. Do NOT use this to list steering lists or network profiles — those are separate concepts. Use list_steering_lists to see operator preference configurations.. It is categorised as a Read tool in the Carrier MCP: Give Your AI Agent Global Connectivity MCP Server, which means it retrieves data without modifying state.
Register the Carrier MCP: Give Your AI Agent Global Connectivity MCP server in PolicyLayer and add a rule for list_sponsors: 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 MCP: Give Your AI Agent Global Connectivity. Nothing to install.
list_sponsors 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_sponsors 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_sponsors. 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_sponsors is provided by the Carrier MCP: Give Your AI Agent Global Connectivity MCP server (carrier/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 65 Carrier MCP: Give Your AI Agent Global Connectivity tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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