Detail for a single contact — person OR group, by stable id. Returns shape depends on kind: - Person: contact (phone, names, email, org), all chats they appear in, all JID variants, message stats. - Group: chat (group metadata), members with display names, member_count. Args: - contactId: phone d...
AI agents call whatsapp_get_contact to retrieve information from Waha without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a straightforward read operation that queries and returns contact information without modifying, deleting, or executing any actions. The blast radius if misused by an agent would be limited to information disclosure (contact details, chat associations, message statistics), which is a low-severity concern.
From the tool's definition Tool retrieves contact details (phone, names, email, org, chat history, JID variants, message stats for persons; group metadata and members for groups).
Attacks that exploit this kind of access
Detail for a single contact — person OR group, by stable id. Returns shape depends on kind: - Person: contact (phone, names, email, org), all chats they appear in, all JID variants, message stats. - Group: chat (group metadata), members with display names, member_count. Args: - contactId: phone digits (person;. It is categorised as a Read tool in the Waha MCP Server, which means it retrieves data without modifying state.
Register the Waha MCP server in PolicyLayer and add a rule for whatsapp_get_contact: 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 Waha. Nothing to install.
whatsapp_get_contact 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_contact 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_contact. 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_contact is provided by the Waha MCP server (@marcos-heidemann/waha-mcp-server). 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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