Search the shared knowledge base semantically. Find bug fixes, patterns, decisions, and conventions contributed by any agent.
AI agents call corn_knowledge_search to retrieve information from CornMCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs semantic search across a knowledge base to retrieve existing information. It does not create, modify, delete, or execute any operations. The action is purely informational retrieval with read-only semantics. No side effects or state changes occur.
From the tool's definition Tool description states 'Search the shared knowledge base semantically. Find bug fixes, patterns, decisions, and conventions' — this is a query/retrieval operation with no modification or execution capability.
Documented attack patterns abuse exactly the kind of access corn_knowledge_search gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and CornMCP, and nothing reaches the server without passing your rules. This is the rule we recommend for corn_knowledge_search:
{
"version": "1",
"default": "deny",
"tools": {
"corn_knowledge_search": {}
}
}corn_knowledge_search is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Search the shared knowledge base semantically. Find bug fixes, patterns, decisions, and conventions contributed by any agent. It is categorised as a Read tool in the CornMCP MCP Server, which means it retrieves data without modifying state.
Register the Corn MCP server in PolicyLayer and add a rule for corn_knowledge_search: 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 CornMCP. Nothing to install.
corn_knowledge_search 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 corn_knowledge_search 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 corn_knowledge_search. 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.
corn_knowledge_search is provided by the Corn MCP server (yuki-20/cornmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 18 CornMCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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18 CornMCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.