dialog_open

Open a dialog with a user.

SERVERSlack SOURCEkarbassi/slack-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/karbassi-slack-mcp/dialog-open.md

WHAT IT DOES

What dialog_open does on Slack

AI agents invoke dialog_open to trigger actions in Slack. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why dialog_open is rated High

Opening a dialog initiates an external operation in the Slack platform, pushing an interactive modal/dialog to a user's interface. This is not a simple read or write of stored data; it triggers a real-time UI event for another user. It could be misused to spam users with dialogs or phish for input, but does not directly delete data or move money.

From the tool's definition "Open a dialog with a user" — triggers an external UI interaction in Slack directed at a specific user

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs dialog_open safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Slack, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For dialog_open, this is the rule to start with:

dialog_open Rate-limited

dialog_open stays usable, but rate-capped: a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "dialog_open": {
      "limits": [
        {
          "counter": "dialog_open_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Slack, apply this rule, and every dialog_open call is checked against it from then on.

FAQ

Questions about dialog_open

What does the dialog_open tool do? +

Open a dialog with a user. It is categorised as a Execute tool in the Slack MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on dialog_open? +

Register the Slack MCP server in PolicyLayer and add a rule for dialog_open: 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 dialog_open? +

dialog_open is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit dialog_open? +

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

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

dialog_open 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.

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