List available log fields. Use to discover filterable fields before searching. Common patterns: http_*, error_*, kubernetes_*
AI agents call graylog_fields to retrieve information from Overwatch MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves schema/metadata information about available fields in Graylog logs. It has no side effects, does not execute queries, does not modify data, and does not trigger external operations. It is purely informational, used to help construct subsequent queries. This is a classic Read operation with minimal blast radius if misused by an AI agent.
From the tool's definition Tool name 'graylog_fields' and description 'List available log fields' indicate a query/discovery operation with no data modification or execution.
Attacks that exploit this kind of access
List available log fields. Use to discover filterable fields before searching. Common patterns: http_*, error_*, kubernetes_*. It is categorised as a Read tool in the Overwatch MCP MCP Server, which means it retrieves data without modifying state.
Register the Overwatch MCP server in PolicyLayer and add a rule for graylog_fields: 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 Overwatch MCP. Nothing to install.
graylog_fields 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 graylog_fields 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 graylog_fields. 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.
graylog_fields is provided by the Overwatch MCP server (malindarathnayake/overwatch-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
graylog_fields is one line of Overwatch's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
Teams ship this data inside their own products. See what a licence covers →