AI agents call list_secrets to retrieve information from Vercel MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves sensitive information (secrets/environment variables) but does not modify or delete data. However, the exposure of secrets themselves represents a moderate security risk if an AI agent gains unauthorized access to this tool, as secrets could be exfiltrated. Read category is correct, but severity is elevated to medium due to the sensitive nature of the data being queried.
From the tool's definition Tool name 'list_secrets' and description 'List all secrets' indicate retrieval/query of existing data without modification. The verb 'list' is a read operation.
Documented attack patterns abuse exactly the kind of access list_secrets 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 list_secrets:
{
"version": "1",
"default": "deny",
"tools": {
"list_secrets": {}
}
}list_secrets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all secrets. It is categorised as a Read tool in the Vercel MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Vercel MCP Server MCP server in PolicyLayer and add a rule for list_secrets: 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.
list_secrets is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list_secrets 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 list_secrets. 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.
list_secrets 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.