Rank documents by PageRank (importance). Returns top documents by incoming citation weight. Isolated nodes (no edges) receive a score of 0 and rank last.
AI agents call knowledge_central 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 tool queries and ranks existing documents using a graph-based algorithm (PageRank). It retrieves information without side effects, creating no new data, executing no code, and causing no irreversible changes. It is a straightforward Read operation with low severity since misuse would only return ranked document lists without operational impact.
From the tool's definition Tool description states it 'Rank documents by PageRank' and 'Returns top documents' — purely a retrieval and ranking operation with no modification, deletion, or execution of external operations.
Attacks that exploit this kind of access
Rank documents by PageRank (importance). Returns top documents by incoming citation weight. Isolated nodes (no edges) receive a score of 0 and rank last. 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_central: 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_central 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_central 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_central. 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_central 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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