AI agents call search_contacts 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 performs a simple search/lookup of contact data with no ability to modify, delete, or execute operations. It is a classic Read category tool. Severity is low because accessing contact names poses minimal risk; contacts are typically non-sensitive metadata and the search scope is limited to the user's own saved contacts.
From the tool's definition Tool description states 'Search saved contacts by name substring (case-insensitive). Returns up to' — a read-only query operation that retrieves contact information without modification or side effects.
Attacks that exploit this kind of access
Search saved contacts by name substring (case-insensitive). Returns up to. 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 search_contacts: 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.
search_contacts 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 search_contacts 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 search_contacts. 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.
search_contacts 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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