Create a multipart upload session for large files (>25MB). This enables efficient upload of large documents by splitting them into chunks. Use this for files that exceed the standard upload limit.
AI agents use upload-create to create or update resources in Universal OpenAI Vector Store MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Universal OpenAI Vector Store MCP Server environment.
This tool creates a reversible resource—an upload session object—without executing arbitrary code or permanently destroying data. It prepares infrastructure for file ingestion but does not yet persist the actual file content.
From the tool's definition The tool 'upload-create' initiates a multipart upload session for large files, which creates a new resource (an upload session) in the vector store system.
Documented attack patterns abuse exactly the kind of access upload-create gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Universal OpenAI Vector Store MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for upload-create:
{
"version": "1",
"default": "deny",
"tools": {
"upload-create": {
"limits": [
{
"counter": "upload-create_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload-create 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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Create a multipart upload session for large files (>25MB). This enables efficient upload of large documents by splitting them into chunks. Use this for files that exceed the standard upload limit. It is categorised as a Write tool in the Universal OpenAI Vector Store MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Universal OpenAI Vector Store MCP Server MCP server in PolicyLayer and add a rule for upload-create: 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 Universal OpenAI Vector Store MCP Server. Nothing to install.
upload-create 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 upload-create 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 upload-create. 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.
upload-create is provided by the Universal OpenAI Vector Store MCP Server MCP server (jezweb/openai-vector-assistant-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Universal OpenAI Vector Store MCP Server, 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.
21 Universal OpenAI Vector Store MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.