list_tts_engines

List installed Text-to-Speech engines (entities in the tts domain).

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-tts-engines.md

WHAT IT DOES

What list_tts_engines does on Ha Nexus Agent

AI agents call list_tts_engines 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_tts_engines is rated Low

This tool queries and returns information about installed TTS engines without modifying, deleting, or executing any actions. It is a straightforward read operation that retrieves system configuration metadata. The low severity reflects minimal blast radius—an attacker gaining this capability alone could only enumerate TTS capabilities, not control them or affect the system.

From the tool's definition Tool name 'list_tts_engines' and description 'List installed Text-to-Speech engines' indicate retrieval of configuration data with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

list_tts_engines Allowed

list_tts_engines 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_tts_engines": {}
  }
}

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_tts_engines call is checked against it from then on.

FAQ

Questions about list_tts_engines

What does the list_tts_engines tool do? +

List installed Text-to-Speech engines (entities in the tts domain). 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_tts_engines? +

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

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

Can I rate-limit list_tts_engines? +

Yes. Add a rate_limit block to the list_tts_engines 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_tts_engines completely? +

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

list_tts_engines 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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