log_message

THE RISK

Medium Risk

Why log_message needs a policy

This tool creates and stores conversation data in a persistent database. While it modifies state, it is not destructive (messages can be deleted via the 'forget' tool), not executable (it doesn't run code or commands), and not financial.

From the tool's definition The tool 'log_message' with description 'Save a conversation message to persistent memory' performs a create operation that stores data in Supabase.

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

POLICY

How to control log_message

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

policy.json

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

log_message 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 Claude 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 Claude Memory tools

Destructive forget Deactivate a previously saved fact. Use when the user says Write start_session Initialize a new memory session and load context. Call once at the start of each conversat Write end_session Save a session summary before ending. Call at the end of each conversation. Write remember Save an important fact to persistent memory. Use when the user says Read load_context Load recent conversation summaries and saved facts. Call at session start for context. Read recall Search conversation history, summaries, and facts for a topic. Use when the user asks abou

All 7 Claude 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 log_message

What does the log_message tool do? +

Save a conversation message to persistent memory. Call this for each user/assistant exchange. It is categorised as a Write tool in the Claude 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 log_message? +

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

What risk level is log_message? +

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

Can I rate-limit log_message? +

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

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

log_message is provided by the Claude Memory MCP server (jordanl61/claude-memory). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Claude Memory tool call.

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

CHECK YOUR STACK →