AI agents call cribl_getSources to retrieve information from Cribl without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves source configurations from a specified worker group. It performs a read-only operation that gathers information without creating, modifying, deleting, or executing anything. The blast radius of misuse is minimal—an attacker could learn about data sources but cannot alter configurations, execute operations, or cause destructive changes. Classified as Read with low severity.
From the tool's definition Tool name 'getSources' and description 'Fetches source configurations' indicate a retrieval operation with no modification or side effects.
Attacks that exploit this kind of access
Fetches source configurations in a specified worker group. It is categorised as a Read tool in the Cribl MCP Server, which means it retrieves data without modifying state.
Register the Cribl MCP server in PolicyLayer and add a rule for cribl_getSources: 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 Cribl. Nothing to install.
cribl_getSources 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 cribl_getSources 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 cribl_getSources. 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.
cribl_getSources is provided by the Cribl MCP server (pebbletek/cribl-mcp). 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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