send_interactive_message · Slack MCP Server MCP

WHAT IT DOES

What send_interactive_message does on Slack MCP Server

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

WHY IT NEEDS A POLICY

Why send_interactive_message needs a policy

The tool name strongly implies sending a message to Slack, which is a Write operation (creates new message content). 'Interactive' likely refers to Block Kit interactive components. Description is empty, lowering confidence, but context from sibling tools and server description supports this classification. Severity is medium as misuse could send messages to any channel in the workspace.

From the tool's definition Tool name 'send_interactive_message' combined with server description mentioning 'messaging' and 'Block Kit formatting'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

send_interactive_message Rate-limited

send_interactive_message 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": {
    "send_interactive_message": {
      "limits": [
        {
          "counter": "send_interactive_message_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 MCP Server, so you can run agents against it safely.

FAQ

Questions about send_interactive_message

What does the send_interactive_message tool do? +

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

How do I enforce a policy on send_interactive_message? +

Register the Slack MCP Server MCP server in PolicyLayer and add a rule for send_interactive_message: 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.

What risk level is send_interactive_message? +

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

Can I rate-limit send_interactive_message? +

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

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

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