list_media

List files/folders in the Card Builder media directory (relative to www/card_builder/).

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/list-media.md

WHAT IT DOES

What list_media does on Ha Nexus Agent

AI agents call list_media 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 list_media is rated Low

This tool queries the file system to enumerate media files and folders without creating, modifying, deleting, or executing any operations. It has minimal blast radius—an AI agent could at worst enumerate files an authorized user already has access to via Home Assistant's www directory. This is a straightforward read operation.

From the tool's definition Tool name is 'list_media' and description explicitly states it 'List files/folders in the Card Builder media directory'. The verb 'list' and the passive retrieval of directory contents indicate a read-only operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

list_media Allowed

list_media 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": {
    "list_media": {}
  }
}

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 list_media call is checked against it from then on.

FAQ

Questions about list_media

What does the list_media tool do? +

List files/folders in the Card Builder media directory (relative to www/card_builder/). 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 list_media? +

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

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

Can I rate-limit list_media? +

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

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

list_media 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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