users_profile_set · Slack MCP: Risk & Policy

WHAT IT DOES

What users_profile_set does on Slack

AI agents use users_profile_set to create or update resources in Slack — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Slack environment.

WHY IT NEEDS A POLICY

Why users_profile_set needs a policy

This tool modifies user profile data, which is a reversible write operation. It does not delete data (not Destructive), execute arbitrary code (not Execute), or move money (not Financial). The severity is high because unauthorized profile modifications could affect user identity, visibility, and communications across an organization's Slack workspace, impacting multiple users and trust in the system. Confidence is 0.

From the tool's definition Tool name 'users_profile_set' indicates a user profile modification operation. The '_set' suffix denotes mutation/write capability.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

users_profile_set Rate-limited

users_profile_set stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "users_profile_set": {
      "limits": [
        {
          "counter": "users_profile_set_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Slack, so you can run agents against it safely.

FAQ

Questions about users_profile_set

What does the users_profile_set tool do? +

users_profile_set. It is categorised as a Write tool in the Slack MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on users_profile_set? +

Register the Slack MCP server in PolicyLayer and add a rule for users_profile_set: 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. Nothing to install.

What risk level is users_profile_set? +

users_profile_set is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit users_profile_set? +

Yes. Add a rate_limit block to the users_profile_set 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.

How do I block users_profile_set completely? +

Set action: deny in the PolicyLayer policy for users_profile_set. 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.

What MCP server provides users_profile_set? +

users_profile_set is provided by the Slack MCP server (karbassi/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.