calendar_get_installed_calendars

List the calendar integrations connected to the user (undocumented session endpoint).

SERVERSlack SOURCEkarbassi/slack-mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/karbassi-slack-mcp/calendar-get-installed-calendars.md

WHAT IT DOES

What calendar_get_installed_calendars does on Slack

AI agents call calendar_get_installed_calendars to retrieve information from Slack without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why calendar_get_installed_calendars is rated Low

This tool queries and returns a list of calendar integrations connected to a user. It performs no side effects, does not modify data, does not execute operations, and does not delete or move data. It is a straightforward information retrieval operation.

From the tool's definition Tool name contains 'get' and description states 'List the calendar integrations' — a retrieval operation with no modification or execution. The endpoint is undocumented but the operation itself is read-only.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs calendar_get_installed_calendars 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 calendar_get_installed_calendars, this is the rule to start with:

calendar_get_installed_calendars Allowed

calendar_get_installed_calendars is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "calendar_get_installed_calendars": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about calendar_get_installed_calendars

What does the calendar_get_installed_calendars tool do? +

List the calendar integrations connected to the user (undocumented session endpoint). It is categorised as a Read tool in the Slack MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on calendar_get_installed_calendars? +

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

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

Can I rate-limit calendar_get_installed_calendars? +

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

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

calendar_get_installed_calendars 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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