upload_asset

POST /v5/assets. Current Bannerbear V5 operation; provider scopes, locks and credits apply. Mandatory confirmation before provider execution; one submission only.

SERVERBannerbear Mcp Cli SOURCE@thenavidm/bannerbear-mcp-cli

Medium RISK CLASS

Category Write

Parameters 42 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/thenavidm-bannerbear-mcp-cli/upload-asset.md

WHAT IT DOES

What upload_asset does on Bannerbear Mcp Cli

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

Parameter	Type	Required	Description
`account`	string	—	Exact private workspace profile label; no fallback to another profile key.
`confirm`	boolean	—	Set true only when the user asked for exactly this action.
`asset_file`	string	Yes	Regular non-symlink local file, at most 5,000,000 bytes. Uploaded only after confirmation.
`content_type`	string	Yes	Exact documented Content-Type for these raw file bytes.

Parameters from the server's own tool schema.

RISK

Why upload_asset is rated Medium

An AI agent can call upload_asset faster than any human can review: one bad instruction and it creates or modifies resources in Bannerbear Mcp Cli by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs upload_asset safely

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

upload_asset Rate-limited

upload_asset 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": {
    "upload_asset": {
      "limits": [
        {
          "counter": "upload_asset_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 Bannerbear Mcp Cli, apply this rule, and every upload_asset call is checked against it from then on.

FAQ

Questions about upload_asset

What does the upload_asset tool do? +

POST /v5/assets. Current Bannerbear V5 operation; provider scopes, locks and credits apply. Mandatory confirmation before provider execution; one submission only. It is categorised as a Write tool in the Bannerbear Mcp Cli MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does upload_asset accept? +

upload_asset accepts 4 parameters: account, confirm, asset_file, content_type. Required: asset_file, content_type. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on upload_asset? +

Register the Bannerbear Mcp Cli MCP server in PolicyLayer and add a rule for upload_asset: 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 Bannerbear Mcp Cli. Nothing to install.

What risk level is upload_asset? +

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

Can I rate-limit upload_asset? +

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

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

upload_asset is provided by the Bannerbear Mcp Cli MCP server (@thenavidm/bannerbear-mcp-cli). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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