AI agents use upload_cert to create or update resources in Vercel MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vercel MCP Server environment.
Uploading a certificate is a Write operation (creates or modifies data reversibly). However, it rates high severity because misconfigured or malicious certificates could enable man-in-the-middle attacks, compromise HTTPS security, or break service availability. The blast radius is significant in a deployment context where certificates protect production domains.
From the tool's definition Tool name 'upload_cert' and description 'Upload a certificate' indicate creation/modification of security certificates, which are critical infrastructure components.
Documented attack patterns abuse exactly the kind of access upload_cert gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vercel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for upload_cert:
{
"version": "1",
"default": "deny",
"tools": {
"upload_cert": {
"limits": [
{
"counter": "upload_cert_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}upload_cert 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 certificate. It is categorised as a Write tool in the Vercel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vercel MCP Server MCP server in PolicyLayer and add a rule for upload_cert: 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 Vercel MCP Server. Nothing to install.
upload_cert 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_cert 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_cert. 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_cert is provided by the Vercel MCP Server MCP server (quegenx/vercel-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 154 Vercel MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
154 Vercel MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.