slack_post_rich_message · Mcp Gmail MCP: Risk & Policy

WHAT IT DOES

What slack_post_rich_message does on Mcp Gmail

AI agents call slack_post_rich_message as a supporting operation in Mcp Gmail workflows.

WHY IT NEEDS A POLICY

Why slack_post_rich_message needs a policy

The description is empty, so classification is based solely on the tool name. The name suggests a Write operation (posting a message to Slack), but the mismatch between the tool name and the server context (Gmail/GitHub) raises uncertainty. If it does post Slack messages, that would be Write/medium severity. Confidence is low due to no description and contextual mismatch.

From the tool's definition Tool description is empty; tool name 'slack_post_rich_message' suggests posting a message to Slack, but this cannot be confirmed from the description alone.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

slack_post_rich_message Rate-limited

slack_post_rich_message gets a rate cap, and everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "slack_post_rich_message": {
      "limits": [
        {
          "counter": "slack_post_rich_message_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

SET A RULE FOR THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about slack_post_rich_message

What does the slack_post_rich_message tool do? +

slack_post_rich_message. It is categorised as a Other tool in the Mcp Gmail MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on slack_post_rich_message? +

Register the Mcp Gmail MCP server in PolicyLayer and add a rule for slack_post_rich_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 Mcp Gmail. Nothing to install.

What risk level is slack_post_rich_message? +

slack_post_rich_message is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit slack_post_rich_message? +

Yes. Add a rate_limit block to the slack_post_rich_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 slack_post_rich_message completely? +

Set action: deny in the PolicyLayer policy for slack_post_rich_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 slack_post_rich_message? +

slack_post_rich_message is provided by the Mcp Gmail MCP server (@monsoft/mcp-gmail). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.