AI agents use vast_create_companion 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.
| Parameter | Type | Required | Description |
|---|---|---|---|
name | string | Yes | Companion name |
width | number | — | Companion width in pixels |
height | number | — | Companion height in pixels |
Parameters from the server's own tool schema.
This tool creates/adds a new VAST companion ad, which is a reversible modification to advertising campaign data. VAST (Video Ad Serving Template) companions are standard ad elements that can be created and later modified or removed. The operation has a defined blast radius (affecting ad serving configuration) but is not irreversible (can be modified/deleted), not code execution, and carries no financial transaction.
From the tool's definition Tool name 'vast_create_companion' and description 'Create a new VAST companion' indicate a create operation that modifies ad campaign configuration by adding a new companion ad asset.
Attacks that exploit this kind of access
Create a new VAST companion. 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.
vast_create_companion accepts 3 parameters: name, width, height. Required: name. The full parameter table on this page comes from the server's own tool schema.
Register the AdButler MCP server in PolicyLayer and add a rule for vast_create_companion: 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.
vast_create_companion is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the vast_create_companion 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.
Set action: deny in the PolicyLayer policy for vast_create_companion. 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.
vast_create_companion 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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