Upload a local file or directory to the specified OSS bucket. Note: You must call the oss_env_init tool to initialize OSS environment variables before using this tool.
AI agents use oss_upload 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 or modifies data in Alibaba Cloud's Object Storage Service (OSS) by uploading files. It is reversible—uploaded files can be deleted or overwritten later—making it Write rather than Destructive.
From the tool's definition Tool name 'oss_upload' and description 'Upload a local file or directory to the specified OSS bucket' indicate creation/modification of data in cloud storage without irreversible deletion.
Documented attack patterns abuse exactly the kind of access oss_upload 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:
{
"version": "1",
"default": "deny",
"tools": {
"oss_upload": {
"limits": [
{
"counter": "oss_upload_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}oss_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 local file or directory to the specified OSS bucket. Note: You must call the oss_env_init tool to initialize OSS environment variables before using this tool. 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: 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 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 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. 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 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.
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59 Wuying AgentBay tools catalogued and risk-classified — across an index of 43,000+ MCP servers.