update_note

THE RISK

Medium Risk

Why update_note needs a policy

This tool creates or modifies data in a reversible manner, fitting the Write category. Severity is medium because misuse could corrupt semantic relationships in the memory graph (e.g., applying wrong tags/keywords could degrade agent reasoning), but the changes are not irreversible and affect only metadata/summaries rather than core operational systems.

From the tool's definition Tool name 'update_note' and description 'Updates contextual summary, tags or keywords for an existing note' indicate modification of existing data.

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

POLICY

How to control update_note

PolicyLayer is an MCP gateway — it sits between your AI agents and A-MEM: Agentic Memory System, and nothing reaches the server without passing your rules. This is the rule we recommend for update_note:

policy.json

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

update_note 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 A-MEM: Agentic Memory System — 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 →

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EXPLORE

Related tools and policies

More A-MEM: Agentic Memory System tools

Destructive delete_atomic_note Deletes a note from the memory system. Removes the note from Graph and Vector Store as wel Destructive remove_relation Removes a relation between two notes. Destructive reset_memory Resets the complete memory system (Graph + Vector Store). Deletes all notes, edges, and em Execute run_memory_enzymes Runs comprehensive memory maintenance enzymes: repairs corrupted nodes, prunes old/weak li Execute research_and_store Performs deep web research on a query and stores the findings as atomic notes. Uses Google Write add_file Stores the content of a file (e.g., .md) as a note in the memory system. Supports automati Write add_relation Adds a manual relation between two notes. Write create_atomic_note Stores a new piece of information in the memory system. Automatically classifies the note

All 15 A-MEM: Agentic Memory System 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_note

What does the update_note tool do? +

Updates contextual summary, tags or keywords for an existing note. It is categorised as a Write tool in the A-MEM: Agentic Memory System 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_note? +

Register the A-MEM: Agentic Memory System MCP server in PolicyLayer and add a rule for update_note: 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 A-MEM: Agentic Memory System. Nothing to install.

What risk level is update_note? +

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

Can I rate-limit update_note? +

Yes. Add a rate_limit block to the update_note 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_note completely? +

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

update_note is provided by the A-MEM: Agentic Memory System MCP server (tobs-code/a-mem-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every A-MEM: Agentic Memory System tool call.

Start from A-MEM: Agentic Memory System, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →