list_roots

List all top-level concepts in the knowledge graph with their direct children. Call this at the start of a session to get a high-level project overview.

SERVERMegaMemory SOURCE0xk3vin/megamemory

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade D, identity unverified Pull the record →

WHAT IT DOES

What list_roots does on MegaMemory

AI agents call list_roots to retrieve information from MegaMemory without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why list_roots is rated Low

This tool retrieves and displays existing data from the knowledge graph without creating, modifying, deleting, or executing anything. It is purely informational, making it a Read operation with low severity since unauthorized access to project structure information poses minimal direct risk.

From the tool's definition Tool name 'list_roots' and description 'List all top-level concepts' indicate retrieval/querying of data. The phrase 'get a high-level project overview' confirms read-only introspection with no modifications or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_roots safely

PolicyLayer is an MCP gateway: it sits between your AI agents and MegaMemory, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_roots, this is the rule to start with:

list_roots Allowed

list_roots is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_roots": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect MegaMemory, apply this rule, and every list_roots call is checked against it from then on.

FAQ

Questions about list_roots

What does the list_roots tool do? +

List all top-level concepts in the knowledge graph with their direct children. Call this at the start of a session to get a high-level project overview. It is categorised as a Read tool in the MegaMemory MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_roots? +

Register the MegaMemory MCP server in PolicyLayer and add a rule for list_roots: 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 MegaMemory. Nothing to install.

What risk level is list_roots? +

list_roots is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list_roots? +

Yes. Add a rate_limit block to the list_roots 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.

How do I block list_roots completely? +

Set action: deny in the PolicyLayer policy for list_roots. 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.

What MCP server provides list_roots? +

list_roots is provided by the MegaMemory MCP server (0xk3vin/megamemory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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