AI agents call omarchy_preview_theme to retrieve information from Omarchy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and returns a preview image for a theme—a read-only operation that neither modifies system state nor triggers external side effects. It falls clearly under the Read category with low severity since misuse would only result in retrieving image data.
From the tool's definition Tool name 'omarchy_preview_theme' and description 'Get a preview image for an Omarchy theme by name' indicate a retrieval operation with no side effects.
Attacks that exploit this kind of access
Get a preview image for an Omarchy theme by name. It is categorised as a Read tool in the Omarchy MCP Server, which means it retrieves data without modifying state.
Register the Omarchy MCP server in PolicyLayer and add a rule for omarchy_preview_theme: 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 Omarchy. Nothing to install.
omarchy_preview_theme 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 omarchy_preview_theme 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 omarchy_preview_theme. 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.
omarchy_preview_theme is provided by the Omarchy MCP server (servicestack/omarchy-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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