AI agents call list_tool_groups to retrieve information from Engram without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and presents information about available tools organized by category. It has no side effects, does not execute code, modify data, or trigger external operations. It is purely informational and discovery-oriented, making it a straightforward Read operation with minimal security risk.
From the tool's definition Tool name and description indicate it 'lists' (lista) MCP tools grouped by function. The verb 'list' is a read-only retrieval operation that returns metadata about tools without modifying, executing, or deleting anything.
Risk signalsAdmin/system-level operation
Attacks that exploit this kind of access
Lista las herramientas MCP agrupadas por función principal (Create, Read, Update, Delete, Graph, Ops/Admin). Útil para descubrir rápidamente qué tool usar. It is categorised as a Read tool in the Engram MCP Server, which means it retrieves data without modifying state.
Register the Engram MCP server in PolicyLayer and add a rule for list_tool_groups: 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 Engram. Nothing to install.
list_tool_groups 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 list_tool_groups 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 list_tool_groups. 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.
list_tool_groups is provided by the Engram MCP server (jacksini/engram-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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