read_config_file

Read a config file relative to HA config dir. E.g. 'automations.yaml' or 'packages/lights.yaml'.

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/read-config-file.md

WHAT IT DOES

What read_config_file does on Ha Nexus Agent

AI agents call read_config_file 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 read_config_file is rated Low

This tool retrieves and queries configuration files from the Home Assistant config directory without modifying, deleting, or executing them. It is a read-only operation. Severity is elevated to medium rather than low because Home Assistant configuration files may contain sensitive information (API keys, passwords, integration credentials, automation rules, device locations), which could be valuable to an attacker.

From the tool's definition Tool name 'read_config_file' and description 'Read a config file' explicitly indicate data retrieval with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

read_config_file Allowed

read_config_file 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": {
    "read_config_file": {}
  }
}

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 read_config_file call is checked against it from then on.

FAQ

Questions about read_config_file

What does the read_config_file tool do? +

Read a config file relative to HA config dir. E.g. 'automations.yaml' or 'packages/lights.yaml'. 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 read_config_file? +

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

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

Can I rate-limit read_config_file? +

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

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

read_config_file 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.

KEEP EXPLORING

More on Ha Nexus Agent, and thousands of servers like it.

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All 276 Ha Nexus Agent tools →

Across the catalogue

claude_read_file on Claude Bridge → The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →