List all available shadcn/ui blocks
AI agents call list_blocks to retrieve information from shadcn 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 and queries available shadcn/ui blocks without side effects. It performs a simple listing operation that returns information only, matching the Read category definition of retrieval operations with no side effects.
From the tool's definition Tool name 'list_blocks' and description 'List all available shadcn/ui blocks' indicate retrieval of metadata about available UI blocks with no modification or execution capability.
Attacks that exploit this kind of access
List all available shadcn/ui blocks. It is categorised as a Read tool in the shadcn MCP Server MCP Server, which means it retrieves data without modifying state.
Register the shadcn MCP Server MCP server in PolicyLayer and add a rule for list_blocks: 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 MCP Server. Nothing to install.
list_blocks 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_blocks 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_blocks. 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_blocks is provided by the shadcn MCP Server MCP server (magnusrodseth/shadcn-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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