AI agents call list_sessions 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.
This tool queries and returns information about active WhatsApp sessions. It has no side effects—it does not create, modify, delete, or execute operations. While session data may be sensitive (revealing which WhatsApp accounts are paired), the tool itself performs a benign information retrieval operation consistent with the 'Read' category.
From the tool's definition Tool name 'list_sessions' and description 'List paired WhatsApp sessions' indicate a read-only operation that retrieves and enumerates existing session data without modification, deletion, or execution of external commands.
Attacks that exploit this kind of access
List paired WhatsApp sessions (e.g. 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_sessions: 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_sessions 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_sessions 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_sessions. 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_sessions 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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