Get information about a Slack user
AI agents call slack_get_user_info 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 retrieves user information from Slack without modifying, deleting, or executing any operations. It is a straightforward query operation that falls squarely into the Read category. Severity is low because user metadata exposure is generally non-destructive, though confidence is not absolute (0.95) pending confirmation that it does not expose sensitive credentials or enable privilege escalation.
From the tool's definition Tool name is 'slack_get_user_info' and description states 'Get information about a Slack user' — a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get information about a Slack user. 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 slack_get_user_info: 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.
slack_get_user_info 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 slack_get_user_info 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 slack_get_user_info. 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.
slack_get_user_info is provided by the Slack MCP Server MCP server (sdancy10/slack-mcp). 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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