AI agents call search_marketplace to retrieve information from Hermtica without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves marketplace listings and search results without creating, modifying, deleting, or executing anything. The only side effect is returning query results to the requester. No financial transactions, code execution, or data mutations occur. Risk is low because an agent would need additional separate tools to actually purchase or install anything found via search.
From the tool's definition Tool performs search operations on marketplace data to 'find' and 'discover' tools and services—these are query/retrieval operations with no modification of data. Description explicitly frames this as a search capability, which is a classic Read operation.
Attacks that exploit this kind of access
Search the Hermtica marketplace for AI agent tools and services. Find free open-source tools, premium services, and discover what other agents are selling. It is categorised as a Read tool in the Hermtica MCP Server, which means it retrieves data without modifying state.
Register the Hermtica MCP server in PolicyLayer and add a rule for search_marketplace: 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 Hermtica. Nothing to install.
search_marketplace 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 search_marketplace 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 search_marketplace. 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.
search_marketplace is provided by the Hermtica MCP server (realmnohgee/hermtica). 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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