libi.generate_captions

Build a timed caption track from a file

SERVERLibi SOURCENagellabs/libi

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/libi/libi.generate-captions.md

WHAT IT DOES

What libi.generate_captions does on Libi

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

RISK

Why libi.generate_captions is rated Medium

Creates a new caption track asset; reversible write operation with moderate blast radius.

From the tool's definition Build a timed caption track from a file

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs libi.generate_captions safely

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

libi.generate_captions Rate-limited

libi.generate_captions 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": {
    "libi.generate_captions": {
      "limits": [
        {
          "counter": "libi.generate_captions_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 Libi, apply this rule, and every libi.generate_captions call is checked against it from then on.

FAQ

Questions about libi.generate_captions

What does the libi.generate_captions tool do? +

Build a timed caption track from a file. It is categorised as a Write tool in the Libi MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on libi.generate_captions? +

Register the Libi MCP server in PolicyLayer and add a rule for libi.generate_captions: 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 Libi. Nothing to install.

What risk level is libi.generate_captions? +

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

Can I rate-limit libi.generate_captions? +

Yes. Add a rate_limit block to the libi.generate_captions 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 libi.generate_captions completely? +

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

libi.generate_captions is provided by the Libi MCP server (Nagellabs/libi). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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