list_calendars

List all calendar entities (REST: GET /api/calendars).

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

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/fistacho-ha-nexus-agent/list-calendars.md

WHAT IT DOES

What list_calendars does on Ha Nexus Agent

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

RISK

Why list_calendars is rated Low

This tool retrieves calendar information from Home Assistant without creating, modifying, deleting, or executing operations. It is purely informational. The GET HTTP method and 'list' operation confirm it is a Read category tool. Severity is low because exposure of calendar entity names poses minimal direct risk, though calendar details could include scheduling information worth protecting.

From the tool's definition Tool description states 'List all calendar entities (REST: GET /api/calendars)' — uses GET method, performs a list/query operation with no modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_calendars safely

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

list_calendars Allowed

list_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": {
    "list_calendars": {}
  }
}

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

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

FAQ

Questions about list_calendars

What does the list_calendars tool do? +

List all calendar entities (REST: GET /api/calendars). It is categorised as a Read tool in the Ha Nexus Agent MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_calendars? +

Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for list_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 Ha Nexus Agent. Nothing to install.

What risk level is list_calendars? +

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

Can I rate-limit list_calendars? +

Yes. Add a rate_limit block to the list_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 list_calendars completely? +

Set action: deny in the PolicyLayer policy for list_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 list_calendars? +

list_calendars is provided by the Ha Nexus Agent MCP server (fistacho/ha-nexus-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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