AI agents invoke download_plugin to trigger actions in FiftyOne MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool downloads and installs external code (a plugin) into the FiftyOne environment. Installing a plugin executes external code and modifies the system state in a significant way. While not purely destructive, the act of installing arbitrary third-party plugins poses high risk as it introduces executable code that could have broad side effects.
From the tool's definition Downloads and installs a FiftyOne plugin
Documented attack patterns abuse exactly the kind of access download_plugin gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and FiftyOne MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for download_plugin:
{
"version": "1",
"default": "deny",
"tools": {
"download_plugin": {
"limits": [
{
"counter": "download_plugin_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}download_plugin stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Downloads and installs a FiftyOne plugin. It is categorised as a Execute tool in the FiftyOne MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the FiftyOne MCP Server MCP server in PolicyLayer and add a rule for download_plugin: 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 FiftyOne MCP Server. Nothing to install.
download_plugin is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the download_plugin 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 download_plugin. 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.
download_plugin is provided by the FiftyOne MCP Server MCP server (voxel51/fiftyone-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from FiftyOne MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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47 FiftyOne MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.