Find bridge documents that connect different topic clusters. Uses betweenness centrality on an undirected graph. Nodes with score 0 are excluded (they are not bridges).
AI agents call knowledge_bridges 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 retrieves and analyzes information from a graph structure without creating, modifying, or deleting data. It computes centrality metrics and returns results, which is a read-only operation with no side effects. The low severity reflects minimal risk from misuse—an attacker could learn network structure but cannot manipulate data or systems.
From the tool's definition Tool performs graph analysis to 'find bridge documents that connect different topic clusters' using betweenness centrality. No modification, deletion, or execution of external operations is described.
Attacks that exploit this kind of access
Find bridge documents that connect different topic clusters. Uses betweenness centrality on an undirected graph. Nodes with score 0 are excluded (they are not bridges). 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_bridges: 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_bridges 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_bridges 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_bridges. 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_bridges 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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