Low Risk

list_shadcn_components

Get a list of all available shadcn/ui components

Part of the Shadcn Ui server.

list_shadcn_components is read-only, but an agent in a loop can still rack up calls and cost. PolicyLayer caps every call before it runs. Live in minutes.

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AI agents call list_shadcn_components to retrieve information from Shadcn Ui without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.

Even though list_shadcn_components only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.

Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_shadcn_components": {}
  }
}

See the full Shadcn Ui policy for all 4 tools.

Get this rule live on your own Shadcn Ui server in minutes. PolicyLayer enforces it on every call, before it runs.

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These attack patterns abuse exactly the kind of access list_shadcn_components gives an agent. Each links to the full case and the policy that stops it:

Browse the full MCP Attack Database →

Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so list_shadcn_components only ever does what you allow.

SECURE SHADCN UI →

Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.

What does the list_shadcn_components tool do? +

Get a list of all available shadcn/ui components. It is categorised as a Read tool in the Shadcn Ui MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_shadcn_components? +

Register the Shadcn Ui MCP server in PolicyLayer and add a rule for list_shadcn_components: 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 Shadcn Ui. Nothing to install.

What risk level is list_shadcn_components? +

list_shadcn_components is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_shadcn_components? +

Yes. Add a rate_limit block to the list_shadcn_components 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.

How do I block list_shadcn_components completely? +

Set action: deny in the PolicyLayer policy for list_shadcn_components. 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.

What MCP server provides list_shadcn_components? +

list_shadcn_components is provided by the Shadcn Ui MCP server (shadcn-ui-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Shadcn Ui tool call.

Deterministic rules across all 4 Shadcn Ui tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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