Search for posts and messages across all communities. Optionally filter by date to find recent posts (e.g. this week, today).
AI agents call search_messages to retrieve information from Mcp Viva Engage without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
search_messages performs a query operation to retrieve and search existing posts and messages without any side effects or data modification. It is a straightforward Read operation that retrieves information from Viva Engage communities. The low severity reflects that misuse would only expose information the user may not have intended to search for, without causing harm or enabling further actions.
From the tool's definition Tool description states 'Search for posts and messages across all communities' with optional date filtering. The verb 'search' and the absence of any modification, creation, or deletion language indicates a retrieval-only operation.
Attacks that exploit this kind of access
Search for posts and messages across all communities. Optionally filter by date to find recent posts (e.g. this week, today). It is categorised as a Read tool in the Mcp Viva Engage MCP Server, which means it retrieves data without modifying state.
Register the Mcp Viva Engage MCP server in PolicyLayer and add a rule for search_messages: 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 Mcp Viva Engage. Nothing to install.
search_messages 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_messages 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_messages. 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_messages is provided by the Mcp Viva Engage MCP server (pranav4186/mcp-viva-engage). 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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