increment_counter

Increment a counter helper.

SERVERHa Nexus Agent SOURCEfistacho/ha-nexus-agent

Medium RISK CLASS

Category Write

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/increment-counter.md

WHAT IT DOES

What increment_counter does on Ha Nexus Agent

AI agents use increment_counter to create or update resources in Ha Nexus Agent, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Ha Nexus Agent environment.

RISK

Why increment_counter is rated Medium

This tool modifies a counter value by incrementing it. This is a reversible write operation (the counter can be decremented or reset). The blast radius is low as it only affects a counter helper entity in Home Assistant with no destructive or financial implications.

From the tool's definition Increment a counter helper

Attacks that exploit this kind of access

RECOMMENDED RULE

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

increment_counter Rate-limited

increment_counter 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": {
    "increment_counter": {
      "limits": [
        {
          "counter": "increment_counter_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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 increment_counter call is checked against it from then on.

FAQ

Questions about increment_counter

What does the increment_counter tool do? +

Increment a counter helper. It is categorised as a Write tool in the Ha Nexus Agent MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on increment_counter? +

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

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

Can I rate-limit increment_counter? +

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

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

increment_counter 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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