update_list_item

THE RISK

Medium Risk

Why update_list_item needs a policy

This tool modifies existing list items within a memory/context management system. It creates or alters data reversibly, fitting the Write category. Severity is low because the blast radius is limited to a single list item within project context memory—no system-wide impact, no financial implications, and no irreversible destruction. The tool operates within a knowledge/memory context, not critical infrastructure.

From the tool's definition Tool name 'update_list_item' and description 'Update an existing item in a list section' indicate modification of existing data in a structured memory system. The action is reversible and does not delete or destroy data.

Documented attack patterns abuse exactly the kind of access update_list_item gives an agent:

POLICY

How to control update_list_item

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Structured Memory, and nothing reaches the server without passing your rules. This is the rule we recommend for update_list_item:

policy.json

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

update_list_item 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.

Create a free account and register Mcp Structured Memory — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Mcp Structured Memory tools

Write add_to_list Add an item to a list section in a memory document Write create_memory Create a new structured memory document with optional initial content. IMPORTANT: After us Write move_list_item Move an item from one section to another Write update_section Update an entire section of a memory document. Content supports full Markdown formatting i Read get_full_memory Retrieve the complete content of a memory document with all Markdown formatting preserved Read get_memory_summary Get a high-level summary of a memory document Read get_section Retrieve a specific section from a memory document Read list_memories List all available memory documents

All 10 Mcp Structured Memory tools →

Write tools on other servers

M-Team MCP Server download_torrent YouTube MCP Server generate_video_title Android Forensics ADB MCP Server combine_reports 0xarchive web3_signup

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about update_list_item

What does the update_list_item tool do? +

Update an existing item in a list section. It is categorised as a Write tool in the Mcp Structured Memory MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_list_item? +

Register the Mcp Structured Memory MCP server in PolicyLayer and add a rule for update_list_item: 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 Mcp Structured Memory. Nothing to install.

What risk level is update_list_item? +

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

Can I rate-limit update_list_item? +

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

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

update_list_item is provided by the Mcp Structured Memory MCP server (nmeierpolys/mcp-structured-memory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Structured Memory tool call.

Start from Mcp Structured Memory, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →