slack_lists_access_set · Slack MCP: Risk & Policy

WHAT IT DOES

What slack_lists_access_set does on Slack

AI agents use slack_lists_access_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 slack_lists_access_set needs a policy

The tool appears to modify access permissions for Slack lists, making it a Write operation (creates or modifies data reversibly). This could affect who can view or interact with lists, making it medium severity—an AI agent could inadvertently grant overly broad access or lock users out, but the change is reversible.

From the tool's definition Tool name 'slack_lists_access_set' indicates modification of access controls for Slack lists. The verb 'set' combined with 'access' suggests changing permissions or sharing settings, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

slack_lists_access_set Rate-limited

slack_lists_access_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": {
    "slack_lists_access_set": {
      "limits": [
        {
          "counter": "slack_lists_access_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 slack_lists_access_set

What does the slack_lists_access_set tool do? +

slack_lists_access_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 slack_lists_access_set? +

Register the Slack MCP server in PolicyLayer and add a rule for slack_lists_access_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 slack_lists_access_set? +

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

Can I rate-limit slack_lists_access_set? +

Yes. Add a rate_limit block to the slack_lists_access_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 slack_lists_access_set completely? +

Set action: deny in the PolicyLayer policy for slack_lists_access_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 slack_lists_access_set? +

slack_lists_access_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.