Query the project knowledge graph. Call this before starting any task to load relevant context about concepts, features, and architecture. Returns matched concepts with their children, edges, and parent context.
AI agents call understand to retrieve information from MegaMemory without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The `understand` tool retrieves and queries existing data from a persistent knowledge graph without creating, modifying, deleting, or executing external operations. It is explicitly described as loading context for tasks, which is a classic Read operation. No destructive, financial, or code-execution semantics are present.
From the tool's definition Tool description states 'Query the project knowledge graph' and 'Returns matched concepts' — pure data retrieval with no modification or side effects. The verb 'Query' and the mechanism of returning context confirms read-only access.
Documented attack patterns abuse exactly the kind of access understand gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MegaMemory, and nothing reaches the server without passing your rules. This is the rule we recommend for understand:
{
"version": "1",
"default": "deny",
"tools": {
"understand": {}
}
}understand is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Query the project knowledge graph. Call this before starting any task to load relevant context about concepts, features, and architecture. Returns matched concepts with their children, edges, and parent context. It is categorised as a Read tool in the MegaMemory MCP Server, which means it retrieves data without modifying state.
Register the MegaMemory MCP server in PolicyLayer and add a rule for understand: 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.
understand 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 understand 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 understand. 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.
understand 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.
Deterministic rules across all 9 MegaMemory tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
9 MegaMemory tools catalogued and risk-classified — across an index of 42,500+ MCP servers.