summarize_session · Memory Engine MCP: Risk & Policy

WHAT IT DOES

What summarize_session does on Memory Engine

AI agents use summarize_session to create or update resources in Memory Engine — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Memory Engine environment.

WHY IT NEEDS A POLICY

Why summarize_session needs a policy

The tool creates/stores data (session summary and optional snapshot) in the memory engine. This is a Write operation since it persists new records without irreversibly destroying existing data. Severity is medium because an AI agent misusing this tool could corrupt session history or inject false memories, affecting future agent behavior across sessions.

From the tool's definition 「セッションの要約を保存する。スナップショットも同時に保存できる。」— the tool saves/stores a session summary and optionally a snapshot, which are reversible write operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

summarize_session Rate-limited

summarize_session stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "summarize_session": {
      "limits": [
        {
          "counter": "summarize_session_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Memory Engine, so you can run agents against it safely.

FAQ

Questions about summarize_session

What does the summarize_session tool do? +

セッションの要約を保存する。スナップショットも同時に保存できる。セッション終了時に呼ぶ。. It is categorised as a Write tool in the Memory Engine MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on summarize_session? +

Register the Memory Engine MCP server in PolicyLayer and add a rule for summarize_session: 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 Memory Engine. Nothing to install.

What risk level is summarize_session? +

summarize_session is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit summarize_session? +

Yes. Add a rate_limit block to the summarize_session 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 summarize_session completely? +

Set action: deny in the PolicyLayer policy for summarize_session. 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 summarize_session? +

summarize_session is provided by the Memory Engine MCP server (kagioneko/memory-engine-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.