Search the knowledge base by keyword, semantic similarity, and tags. Returns ranked documents.
AI agents call knowledge_search to retrieve information from Ralph Hero without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a read-only operation that searches and returns documents from a knowledge base. There are no create, modify, delete, or execute operations implied. The tool has minimal blast radius; misuse would only return unwanted search results, not corrupt data or trigger external actions.
From the tool's definition Tool performs 'Search the knowledge base by keyword, semantic similarity, and tags. Returns ranked documents.' — a query operation that retrieves data without modification or side effects.
Attacks that exploit this kind of access
Search the knowledge base by keyword, semantic similarity, and tags. Returns ranked documents. It is categorised as a Read tool in the Ralph Hero MCP Server, which means it retrieves data without modifying state.
Register the Ralph Hero MCP server in PolicyLayer and add a rule for 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 Ralph Hero. Nothing to install.
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 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 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.
knowledge_search is provided by the Ralph Hero MCP server (ralph-hero-mcp-server). 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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