Search the knowledge base
AI agents call search-knowledge to retrieve information from NestJS MCP Server Module without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a search/retrieval operation on existing knowledge base data with no side effects. It matches the Read category pattern of fetching or querying data. Low severity because searching a knowledge base poses minimal risk even if misused by an AI agent—it cannot modify, delete, or execute external operations.
From the tool's definition Tool description states 'Search the knowledge base' — a query operation that retrieves information without modifying or deleting data.
Attacks that exploit this kind of access
Search the knowledge base. It is categorised as a Read tool in the NestJS MCP Server Module MCP Server, which means it retrieves data without modifying state.
Register the NestJS MCP Server Module MCP server in PolicyLayer and add a rule for search-knowledge: 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 NestJS MCP Server Module. Nothing to install.
search-knowledge 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-knowledge 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-knowledge. 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-knowledge is provided by the NestJS MCP Server Module MCP server (rekog-labs/mcp-nest). 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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