AI agents use file_upload to create or update resources in Codehooks Io MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Codehooks Io MCP Server environment.
File upload is a Write operation because it creates or adds new data reversibly (files can be modified or deleted later). Severity is medium due to moderate blast radius: an agent could upload large files, malicious content, or consume storage quota, but the operation is not destructive (files remain modifiable), financial, or executable code.
From the tool's definition Tool description states 'Upload files to server' — a create/write operation that adds new data to cloud file storage on the Codehooks.io platform.
Documented attack patterns abuse exactly the kind of access file_upload gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Codehooks Io MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for file_upload:
{
"version": "1",
"default": "deny",
"tools": {
"file_upload": {
"limits": [
{
"counter": "file_upload_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}file_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 files to server. It is categorised as a Write tool in the Codehooks Io MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Codehooks Io MCP Server MCP server in PolicyLayer and add a rule for file_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 Codehooks Io MCP Server. Nothing to install.
file_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 file_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 file_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.
file_upload is provided by the Codehooks Io MCP Server MCP server (restdb/codehooks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Codehooks Io 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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20 Codehooks Io MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.