vast_update_channel · AdButler MCP: Risk & Policy

WHAT IT DOES

What vast_update_channel does on AdButler

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

PARAMETERS

Parameter	Type	Required	Description
`id`	number	Yes	VAST channel ID
`name`	string	—	Channel name
`description`	string	—	Channel description

Parameters from the server's own tool schema.

WHY IT NEEDS A POLICY

Why vast_update_channel needs a policy

This tool modifies ad serving channel configuration, which is a reversible write operation. The blast radius is medium because misconfigured VAST channels could disrupt ad campaigns or cause incorrect ad delivery, but the action is not destructive (data remains recoverable) and not financial in nature.

From the tool's definition Tool name 'vast_update_channel' and description 'Update an existing VAST channel' indicate modification of existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

vast_update_channel Rate-limited

vast_update_channel 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": {
    "vast_update_channel": {
      "limits": [
        {
          "counter": "vast_update_channel_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches AdButler, so you can run agents against it safely.

FAQ

Questions about vast_update_channel

What does the vast_update_channel tool do? +

Update an existing VAST channel. It is categorised as a Write tool in the AdButler MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does vast_update_channel accept? +

vast_update_channel accepts 3 parameters: id, name, description. Required: id. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on vast_update_channel? +

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

What risk level is vast_update_channel? +

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

Can I rate-limit vast_update_channel? +

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

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

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