AI agents use drive__upload to create or update resources in Proton-MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Proton-MCP environment.
This tool creates or modifies data (files in Proton Drive) in a reversible manner. It is not destructive since uploaded files can be deleted or overwritten. It does not execute arbitrary code, move money, or perform financial transactions.
From the tool's definition Tool name 'drive__upload' and description 'Upload a file to Proton Drive' indicate creation/modification of data in cloud storage without deletion or irreversible operations.
Documented attack patterns abuse exactly the kind of access drive__upload gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Proton-MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for drive__upload:
{
"version": "1",
"default": "deny",
"tools": {
"drive__upload": {
"limits": [
{
"counter": "drive__upload_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}drive__upload 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.
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Upload a file to Proton Drive. It is categorised as a Write tool in the Proton-MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Proton- MCP server in PolicyLayer and add a rule for drive__upload: 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 Proton-MCP. Nothing to install.
drive__upload is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the drive__upload 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 drive__upload. 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.
drive__upload is provided by the Proton- MCP server (jorgenclaw/proton-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Proton-MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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36 Proton-MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.