Lists all blocks that are currently installed in the project. Agents can use this to determine which blocks are available for customization or updating, and optionally filter by specific block names.
AI agents call listInstalledBlocks to retrieve information from Shadcn Space MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about installed blocks in a project without creating, modifying, deleting, or executing any operations. It is a read-only operation that provides visibility into the current state of the project, similar to other sibling tools like 'listComponents', 'listPages', and 'listInstalledPages'.
From the tool's definition Tool name 'listInstalledBlocks' and description stating it 'Lists all blocks that are currently installed in the project' indicates a query/retrieval operation with no side effects.
Attacks that exploit this kind of access
Lists all blocks that are currently installed in the project. Agents can use this to determine which blocks are available for customization or updating, and optionally filter by specific block names. It is categorised as a Read tool in the Shadcn Space MCP MCP Server, which means it retrieves data without modifying state.
Register the Shadcn Space MCP server in PolicyLayer and add a rule for listInstalledBlocks: 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 Space MCP. Nothing to install.
listInstalledBlocks 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 listInstalledBlocks 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 listInstalledBlocks. 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.
listInstalledBlocks is provided by the Shadcn Space MCP server (shadcnspace/shadcnspace-mcp). 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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