app_available

List all available apps from the catalog. Returns apps that can be installed.

SERVERTruenas SOURCEspranab/truenas-mcp

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/spranab-truenas-mcp/app-available.md

WHAT IT DOES

What app_available does on Truenas

AI agents call app_available to retrieve information from Truenas without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why app_available is rated Low

This tool only reads and returns information about available applications; it performs no creation, modification, deletion, execution, or financial operations. The operation is purely informational with no side effects on the TrueNAS system.

From the tool's definition Tool name 'app_available' and description 'List all available apps from the catalog. Returns apps that can be installed.' indicate a query/list operation that retrieves catalog information without modifying state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs app_available safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Truenas, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For app_available, this is the rule to start with:

app_available Allowed

app_available 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": {
    "app_available": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Truenas, apply this rule, and every app_available call is checked against it from then on.

FAQ

Questions about app_available

What does the app_available tool do? +

List all available apps from the catalog. Returns apps that can be installed. It is categorised as a Read tool in the Truenas MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on app_available? +

Register the Truenas MCP server in PolicyLayer and add a rule for app_available: 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 Truenas. Nothing to install.

What risk level is app_available? +

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

Can I rate-limit app_available? +

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

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

app_available is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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