Look up a concept by its exact ID. Returns the concept with its full context including children, edges, incoming edges, and parent. Unlike
AI agents call get_concept 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.
This tool retrieves and queries data from a knowledge graph without modifying, deleting, or executing code. It is a straightforward read operation that returns concept information. The only potential concern is that retrieved knowledge graph data could theoretically be sensitive, but the tool itself performs no mutations and has minimal blast radius if misused by an agent.
From the tool's definition Tool name 'get_concept' and description 'Look up a concept by its exact ID. Returns the concept with its full context' indicates a retrieval operation with no side effects.
Documented attack patterns abuse exactly the kind of access get_concept 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 get_concept:
{
"version": "1",
"default": "deny",
"tools": {
"get_concept": {}
}
}get_concept is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Look up a concept by its exact ID. Returns the concept with its full context including children, edges, incoming edges, and parent. Unlike. 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 get_concept: 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.
get_concept 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 get_concept 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 get_concept. 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.
get_concept 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.
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9 MegaMemory tools catalogued and risk-classified — across an index of 42,500+ MCP servers.