Buscar mensagens especificamente em grupos privados
AI agents call search_in_private_groups to retrieve information from Slack MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a search operation on existing data (messages in private Slack groups). It only retrieves information and has no capacity to modify, delete, execute commands, or create financial obligations. It is a read-only query operation with low blast radius if misused by an AI agent — worst case would be unauthorized data discovery within the workspace the MCP server already has access to.
From the tool's definition Tool name 'search_in_private_groups' and description 'Buscar mensagens especificamente em grupos privados' (Search messages specifically in private groups) — retrieves/queries message data from private channels with no modification or side effects.
Attacks that exploit this kind of access
Buscar mensagens especificamente em grupos privados. It is categorised as a Read tool in the Slack MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Slack MCP Server MCP server in PolicyLayer and add a rule for search_in_private_groups: 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 Slack MCP Server. Nothing to install.
search_in_private_groups 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_in_private_groups 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_in_private_groups. 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_in_private_groups is provided by the Slack MCP Server MCP server (will2023a/mcp-slack). 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.
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