refresh_asset_previews

SERVERAos SOURCE@hybridlabor-api/aos

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/hybridlabor-api-aos/refresh-asset-previews.md

WHAT IT DOES

What refresh_asset_previews does on Aos

AI agents use refresh_asset_previews to create or update resources in Aos, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Aos environment.

RISK

Why refresh_asset_previews is rated Medium

Writes image files to disk overwriting existing previews; destructive but reversible through regeneration.

From the tool's definition Capture fresh preview PNG assets, write them to disk, regenerate thumbnails, writes image files (destructive).

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs refresh_asset_previews safely

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

refresh_asset_previews Rate-limited

refresh_asset_previews stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "refresh_asset_previews": {
      "limits": [
        {
          "counter": "refresh_asset_previews_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about refresh_asset_previews

What does the refresh_asset_previews tool do? +

Capture fresh preview PNG assets from one or more live TOP nodes and write them to disk. Use it to regenerate stale thumbnails for library/package assets after a network changes; requires a running TouchDesigner bridge and writes image files (destructive). It is categorised as a Write tool in the Aos MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on refresh_asset_previews? +

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

What risk level is refresh_asset_previews? +

refresh_asset_previews is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit refresh_asset_previews? +

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

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

refresh_asset_previews is provided by the Aos MCP server (@hybridlabor-api/aos). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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