Get newsletter info by invite code.
AI agents call whatsapp_get_newsletter_by_invite to retrieve information from WSAPI WhatsApp 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 information about a WhatsApp newsletter using an invite code as input. It performs a lookup or query operation that does not modify, delete, or execute any actions—it only fetches existing data. The potential blast radius is minimal: an attacker could enumerate newsletters if invite codes are guessable, but cannot modify accounts, send unauthorized messages, or cause financial harm.
From the tool's definition Tool name 'get_newsletter_by_invite' and description 'Get newsletter info by invite code' indicate data retrieval with no side effects. The verb 'get' and the action of retrieving newsletter information are characteristic of a Read operation.
Attacks that exploit this kind of access
Get newsletter info by invite code. It is categorised as a Read tool in the WSAPI WhatsApp MCP Server MCP Server, which means it retrieves data without modifying state.
Register the WSAPI WhatsApp MCP Server MCP server in PolicyLayer and add a rule for whatsapp_get_newsletter_by_invite: 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 WSAPI WhatsApp MCP Server. Nothing to install.
whatsapp_get_newsletter_by_invite 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 whatsapp_get_newsletter_by_invite 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 whatsapp_get_newsletter_by_invite. 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.
whatsapp_get_newsletter_by_invite is provided by the WSAPI WhatsApp MCP Server MCP server (wsapi-chat/wsapi-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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