save_ui_component

THE RISK

Medium Risk

Why save_ui_component needs a policy

This tool creates or stores UI component definitions, which is a Write operation. Severity is medium rather than high because: (1) the impact is scoped to UI components in Lovable projects, (2) changes are typically reversible (components can be modified or replaced), and (3) there is no financial impact or permanent data destruction.

From the tool's definition Tool name 'save_ui_component' and description 'Save reusable UI components for Lovable projects' indicate creation/modification of UI component data. The verb 'Save' combined with the object 'reusable UI components' shows reversible data creation.

Documented attack patterns abuse exactly the kind of access save_ui_component gives an agent:

POLICY

How to control save_ui_component

PolicyLayer is an MCP gateway — it sits between your AI agents and SAM, and nothing reaches the server without passing your rules. This is the rule we recommend for save_ui_component:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "save_ui_component": {
      "limits": [
        {
          "counter": "save_ui_component_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

save_ui_component 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.

Create a free account and register SAM — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about save_ui_component

What does the save_ui_component tool do? +

Save reusable UI components for Lovable projects. It is categorised as a Write tool in the SAM MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on save_ui_component? +

Register the SAM MCP server in PolicyLayer and add a rule for save_ui_component: 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 SAM. Nothing to install.

What risk level is save_ui_component? +

save_ui_component is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit save_ui_component? +

Yes. Add a rate_limit block to the save_ui_component 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 save_ui_component completely? +

Set action: deny in the PolicyLayer policy for save_ui_component. 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 save_ui_component? +

save_ui_component is provided by the SAM MCP server (pigrieco/mcp-memory-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every SAM tool call.

Start from SAM, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →