AI agents call search_modules to retrieve information from Oh My KEGG MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and searches data from the KEGG database without creating, modifying, deleting, or executing operations. It is a pure read operation that returns query results. There is no side effect beyond data retrieval. Severity is low because misuse would only expose existing biological data without enabling harmful actions.
From the tool's definition Tool name is 'search_modules' and description states it 'Search[es] KEGG modules by name or function' — a straightforward query operation with no modification, deletion, or execution of external commands.
Documented attack patterns abuse exactly the kind of access search_modules gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Oh My KEGG MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for search_modules:
{
"version": "1",
"default": "deny",
"tools": {
"search_modules": {}
}
}search_modules is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search KEGG modules by name or function. It is categorised as a Read tool in the Oh My KEGG MCP MCP Server, which means it retrieves data without modifying state.
Register the Oh My KEGG MCP server in PolicyLayer and add a rule for search_modules: 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 Oh My KEGG MCP. Nothing to install.
search_modules 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_modules 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_modules. 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_modules is provided by the Oh My KEGG MCP server (martinuslee/oh-my-kegg-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Oh My KEGG MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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33 Oh My KEGG MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.