Get the reputation score and trust tier for an agent.
AI agents call check_reputation to retrieve information from nullpath MCP Client without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays reputation metadata about agents in the marketplace. It performs no modifications, deletions, code execution, or financial transactions. It is purely informational, similar to other Read tools on the server (discover_agents, lookup_agent, get_capabilities). Low severity because misuse would only expose existing reputation data without enabling harmful downstream actions.
From the tool's definition Tool name 'check_reputation' and description 'Get the reputation score and trust tier for an agent' indicate data retrieval without side effects. The verb 'Get' explicitly shows this is a query operation.
Attacks that exploit this kind of access
Get the reputation score and trust tier for an agent. It is categorised as a Read tool in the nullpath MCP Client MCP Server, which means it retrieves data without modifying state.
Register the nullpath MCP Client MCP server in PolicyLayer and add a rule for check_reputation: 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 nullpath MCP Client. Nothing to install.
check_reputation 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 check_reputation 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 check_reputation. 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.
check_reputation is provided by the nullpath MCP Client MCP server (nullpath-labs/mcp-client). 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.
Teams ship this data inside their own products. See what a licence covers →