create_memory · Structured-sh MCP: Risk & Policy

WHAT IT DOES

What create_memory does on Structured-sh

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

WHY IT NEEDS A POLICY

Why create_memory needs a policy

This tool creates new memory schemas and structures for persistent storage. It is a Write operation because it creates and defines new data structures that are stored persistently. While reversible (the sibling tool 'delete_memory' can remove them), the creation of structured memory schemas affects system state.

From the tool's definition Tool name is 'create_memory' and description states it 'Create a new structured memory with typed fields' and 'defines a schema for storing structured data as Parquet files.' This is a data creation operation that modifies the persistent memory state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_memory Rate-limited

create_memory 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": {
    "create_memory": {
      "limits": [
        {
          "counter": "create_memory_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 Structured-sh, so you can run agents against it safely.

FAQ

Questions about create_memory

What does the create_memory tool do? +

Create a new structured memory with typed fields. This defines a schema for storing structured data as Parquet files. It is categorised as a Write tool in the Structured-sh MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_memory? +

Register the Structured-sh MCP server in PolicyLayer and add a rule for create_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 create_memory? +

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

Can I rate-limit create_memory? +

Yes. Add a rate_limit block to the create_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 create_memory completely? +

Set action: deny in the PolicyLayer policy for create_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 create_memory? +

create_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.