Upload binary file (base64) to active project
AI agents use upload_project_asset to create or update resources in N2n Nexus — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your N2n Nexus environment.
This tool writes data (binary files) to the project storage system in a reversible manner. It modifies project state by adding assets but does not delete, execute code, or move financial resources. The 'active project' scope limits exposure compared to system-wide uploads.
From the tool's definition upload_project_asset: 'Upload binary file (base64) to active project' - explicitly performs file upload operation creating or adding data to a project vault
Documented attack patterns abuse exactly the kind of access upload_project_asset gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and N2n Nexus, and nothing reaches the server without passing your rules. This is the rule we recommend for upload_project_asset:
{
"version": "1",
"default": "deny",
"tools": {
"upload_project_asset": {
"limits": [
{
"counter": "upload_project_asset_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload_project_asset 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 binary file (base64) to active project. It is categorised as a Write tool in the N2n Nexus MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the N2n Nexus MCP server in PolicyLayer and add a rule for upload_project_asset: 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 N2n Nexus. Nothing to install.
upload_project_asset 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_project_asset 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_project_asset. 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_project_asset is provided by the N2n Nexus MCP server (n2ns/n2n-nexus). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from N2n Nexus, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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22 N2n Nexus tools catalogued and risk-classified — across an index of 43,000+ MCP servers.