Upload one or more files (images, fonts, CSS, video, etc.) as assets and receive stable URLs. Use these URLs in your HTML with <img src> or @font-face. Assets are cached on displays. Pass files as base64-encoded data. Requires authentication with at least content_only scope.
Risk signalsHandles credentials or secrets (access_token)
Part of the Agentview server.
Free to start. No card required.
AI agents use upload_asset to create or modify resources in Agentview. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call upload_asset repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Agentview.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"upload_asset": {
"limits": [
{
"counter": "upload_asset_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Agentview policy for all 55 tools.
These attack patterns abuse exactly the kind of access upload_asset gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Upload one or more files (images, fonts, CSS, video, etc.) as assets and receive stable URLs. Use these URLs in your HTML with <img src> or @font-face. Assets are cached on displays. Pass files as base64-encoded data. Requires authentication with at least content_only scope.. It is categorised as a Write tool in the Agentview MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Agentview MCP server in PolicyLayer and add a rule for upload_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 Agentview. Nothing to install.
upload_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_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_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_asset is provided by the Agentview MCP server (rafaelkocurek-nvob/agentview). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 55 Agentview tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.