Upload a local file or directory to the specified URL using HTTP PUT. If a directory is specified, it will be compressed into a zip file before uploading.
AI agents use oss_upload_annon to create or update resources in Wuying AgentBay — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Wuying AgentBay environment.
This tool creates new objects in cloud storage (OSS). While write operations are generally reversible (files can be deleted), the severity is elevated to medium because: (1) uploaded data persists in cloud storage accessible to the system, (2) it could overwrite existing objects if URLs are reused, and (3) in an agent context, unintended uploads could expose sensitive data or consume storage resources.
From the tool's definition Tool description states 'Upload a local file or directory to the specified URL using HTTP PUT', which creates/modifies data in an external storage system (OSS - Object Storage Service). The name 'oss_upload' confirms interaction with cloud object storage.
Documented attack patterns abuse exactly the kind of access oss_upload_annon gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Wuying AgentBay, and nothing reaches the server without passing your rules. This is the rule we recommend for oss_upload_annon:
{
"version": "1",
"default": "deny",
"tools": {
"oss_upload_annon": {
"limits": [
{
"counter": "oss_upload_annon_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}oss_upload_annon 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 local file or directory to the specified URL using HTTP PUT. If a directory is specified, it will be compressed into a zip file before uploading. It is categorised as a Write tool in the Wuying AgentBay MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Wuying AgentBay MCP server in PolicyLayer and add a rule for oss_upload_annon: 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 Wuying AgentBay. Nothing to install.
oss_upload_annon 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 oss_upload_annon 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 oss_upload_annon. 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.
oss_upload_annon is provided by the Wuying AgentBay MCP server (michael98671/agentbay). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Wuying AgentBay, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
59 Wuying AgentBay tools catalogued and risk-classified — across an index of 43,000+ MCP servers.