AI agents use create_access_group 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.
This tool creates a new access group, which is a reversible write operation. It modifies system state by adding a new resource but does not execute arbitrary code, delete data, move money, or trigger external operations with unpredictable side effects. The severity is medium because misconfigured access groups could grant unintended permissions, but the action itself is reversible through deletion or modification.
From the tool's definition Tool name 'create_access_group' indicates creation of a new resource (access group). Description states 'Create a new access group', which is a data creation operation.
Documented attack patterns abuse exactly the kind of access create_access_group 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 create_access_group:
{
"version": "1",
"default": "deny",
"tools": {
"create_access_group": {
"limits": [
{
"counter": "create_access_group_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_access_group 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 new access group. 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 create_access_group: 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.
create_access_group 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 create_access_group 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 create_access_group. 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.
create_access_group 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.
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154 Vercel MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.