check_config
Validate Home Assistant configuration before restart.
This record as markdown: /tools/fistacho-ha-nexus-agent/check-config.md
What check_config does on Ha Nexus Agent
AI agents call check_config 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.
Why check_config is rated Low
This tool performs configuration validation—a diagnostic check that queries the state of Home Assistant configuration files to detect errors. It has no side effects, does not create, modify, delete, or execute anything. The purpose is to verify configuration integrity before a restart action (which would be separate). This is fundamentally a Read operation with minimal risk.
From the tool's definition Tool name 'check_config' and description 'Validate Home Assistant configuration before restart' indicate a read-only validation operation that checks configuration state without modifying or executing changes.
Attacks that exploit this kind of access
The rule that runs check_config 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 check_config, this is the rule to start with:
check_config is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Ha Nexus Agent, apply this rule, and every check_config call is checked against it from then on.
Questions about check_config
Validate Home Assistant configuration before restart. It is categorised as a Read tool in the Ha Nexus Agent MCP Server, which means it retrieves data without modifying state.
Register the Ha Nexus Agent MCP server in PolicyLayer and add a rule for check_config: 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.
check_config is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the check_config 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.
Set action: deny in the PolicyLayer policy for check_config. 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.
check_config 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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