flush_memory · Structured-sh MCP: Risk & Policy

WHAT IT DOES

What flush_memory does on Structured-sh

AI agents invoke flush_memory to trigger actions in Structured-sh. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why flush_memory needs a policy

This tool triggers an explicit I/O operation — forcing buffered in-memory records to be written out to Parquet storage. It is not a simple read, nor does it delete data, but it executes a system-level flush operation whose effects (committing buffered state to persistent storage) depend on current buffer contents and cannot simply be undone. This places it in the Execute category.

From the tool's definition 'Force flush buffered records to Parquet'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

flush_memory Rate-limited

flush_memory stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "flush_memory": {
      "limits": [
        {
          "counter": "flush_memory_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about flush_memory

What does the flush_memory tool do? +

Force flush buffered records to Parquet. It is categorised as a Execute tool in the Structured-sh MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on flush_memory? +

Register the Structured-sh MCP server in PolicyLayer and add a rule for flush_memory: 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 Structured-sh. Nothing to install.

What risk level is flush_memory? +

flush_memory is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit flush_memory? +

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

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

flush_memory is provided by the Structured-sh MCP server (structured-sh/structured). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.