libi.upload_file_to_fal

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.upload-file-to-fal.md

WHAT IT DOES

What libi.upload_file_to_fal does on Libi

AI agents use libi.upload_file_to_fal 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.upload_file_to_fal is rated Medium

Creates or modifies data by persisting files to external storage; reversible via FAL API deletion.

From the tool's definition Upload local file to external storage, return CDN URL for reference

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs libi.upload_file_to_fal 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.upload_file_to_fal, this is the rule to start with:

libi.upload_file_to_fal Rate-limited

libi.upload_file_to_fal 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.upload_file_to_fal": {
      "limits": [
        {
          "counter": "libi.upload_file_to_fal_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.upload_file_to_fal call is checked against it from then on.

FAQ

Questions about libi.upload_file_to_fal

What does the libi.upload_file_to_fal tool do? +

Upload a LOCAL libi file to fal.ai storage and return a fal CDN URL, for use as an image_urls/audio_urls reference in fal generation. The FAL key is handled server-side — never extract or pass it yourself. Result is cached (falUploadedUrl) so repeat calls are free. 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.upload_file_to_fal? +

Register the Libi MCP server in PolicyLayer and add a rule for libi.upload_file_to_fal: 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.upload_file_to_fal? +

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

Can I rate-limit libi.upload_file_to_fal? +

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

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

libi.upload_file_to_fal 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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