cancel_timer

Cancel a running timer.

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

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/fistacho-ha-nexus-agent/cancel-timer.md

WHAT IT DOES

What cancel_timer does on Ha Nexus Agent

AI agents invoke cancel_timer to trigger actions in Ha Nexus Agent. 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 cancel_timer is rated High

Cancelling a running timer is an active operation that triggers an external state change in the smart home system (stops a scheduled timer), which qualifies as Execute. It is reversible in the sense that a new timer can be created, but the act of cancelling interrupts an ongoing operation. Misuse could disrupt automations or scheduled tasks relying on the timer.

From the tool's definition Cancel a running timer

Attacks that exploit this kind of access

RECOMMENDED RULE

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

cancel_timer Rate-limited

cancel_timer 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": {
    "cancel_timer": {
      "limits": [
        {
          "counter": "cancel_timer_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 Ha Nexus Agent, apply this rule, and every cancel_timer call is checked against it from then on.

FAQ

Questions about cancel_timer

What does the cancel_timer tool do? +

Cancel a running timer. It is categorised as a Execute tool in the Ha Nexus Agent MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on cancel_timer? +

Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for cancel_timer: 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 cancel_timer? +

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

Can I rate-limit cancel_timer? +

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

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

cancel_timer 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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