gateway_plan · Slack Max API MCP: Risk & Policy

WHAT IT DOES

What gateway_plan does on Slack Max API MCP

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

WHY IT NEEDS A POLICY

Why gateway_plan needs a policy

An AI agent can call gateway_plan faster than any human can review — one bad instruction and it creates or modifies resources in Slack Max API MCP by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gateway_plan Rate-limited

gateway_plan 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": {
    "gateway_plan": {
      "limits": [
        {
          "counter": "gateway_plan_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 Max API MCP, so you can run agents against it safely.

FAQ

Questions about gateway_plan

What does the gateway_plan tool do? +

Plan a Slack task with minimal context. Returns ranked candidate methods and the next actions. It is categorised as a Write tool in the Slack Max API MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gateway_plan? +

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

What risk level is gateway_plan? +

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

Can I rate-limit gateway_plan? +

Yes. Add a rate_limit block to the gateway_plan 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 gateway_plan completely? +

Set action: deny in the PolicyLayer policy for gateway_plan. 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 gateway_plan? +

gateway_plan is provided by the Slack Max API MCP server (jeongwoobin335/slack-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.