AI agents call vast42_get_closed_caption_file to retrieve information from AdButler without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
id | number | Yes | VAST 4.2 closed caption file ID |
Parameters from the server's own tool schema.
This tool retrieves an existing closed caption file from a VAST 4.2 ad resource. It performs a read-only query operation without modifying, deleting, or executing any code. The operation has minimal blast radius - at worst, an AI agent could retrieve caption data it shouldn't access, but cannot cause financial harm, delete data, or trigger external operations.
From the tool's definition The tool name contains 'get' and the description explicitly states 'Get a single VAST 4.2 closed caption file', which is a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get a single VAST 4.2 closed caption file. It is categorised as a Read tool in the AdButler MCP Server, which means it retrieves data without modifying state.
vast42_get_closed_caption_file accepts 1 parameter: id. Required: id. 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 vast42_get_closed_caption_file: 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.
vast42_get_closed_caption_file is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the vast42_get_closed_caption_file 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 vast42_get_closed_caption_file. 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.
vast42_get_closed_caption_file 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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