List all JID aliases for a session. Each entry maps an alias JID (typically @lid) to a canonical JID (typically @s.whatsapp.net), so the same person shows up as one conversation regardless of which form WhatsApp used.
AI agents call list_aliases to retrieve information from Wa Bridge without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves and returns alias data for identification purposes. It has no side effects—it does not create, modify, delete, or execute anything. While the WhatsApp bridge exposes communication capabilities, this specific tool is purely informational, mapping user identifiers.
From the tool's definition Tool name 'list_aliases' and description: 'List all JID aliases for a session'. This is a retrieval operation that queries alias mappings without modifying, deleting, or executing external operations.
Attacks that exploit this kind of access
List all JID aliases for a session. Each entry maps an alias JID (typically @lid) to a canonical JID (typically @s.whatsapp.net), so the same person shows up as one conversation regardless of which form WhatsApp used. It is categorised as a Read tool in the Wa Bridge MCP Server, which means it retrieves data without modifying state.
Register the Wa Bridge MCP server in PolicyLayer and add a rule for list_aliases: 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 Wa Bridge. Nothing to install.
list_aliases 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_aliases 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_aliases. 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_aliases is provided by the Wa Bridge MCP server (obirimensah05/whatsapp-bridge). 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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