set_value

Set value of input_number, number, or climate temperature.

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/set-value.md

WHAT IT DOES

What set_value does on Ha Nexus Agent

AI agents use set_value 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 set_value is rated Medium

This tool modifies the state of smart home entities (input_number helpers, number entities, or climate temperature setpoints). It creates or changes values in a reversible way — the values can be changed again — making it a Write operation. Misuse could cause discomfort (e.g., setting extreme temperatures) but is generally reversible.

From the tool's definition 'Set value of input_number, number, or climate temperature'

Attacks that exploit this kind of access

RECOMMENDED RULE

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

set_value Rate-limited

set_value 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": {
    "set_value": {
      "limits": [
        {
          "counter": "set_value_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 set_value call is checked against it from then on.

FAQ

Questions about set_value

What does the set_value tool do? +

Set value of input_number, number, or climate temperature. 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 set_value? +

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

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

Can I rate-limit set_value? +

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

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

set_value 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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