log_body_metrics · MCP Logger MCP: Risk & Policy

WHAT IT DOES

What log_body_metrics does on MCP Logger

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

WHY IT NEEDS A POLICY

Why log_body_metrics needs a policy

The tool name 'log_body_metrics' strongly implies creating or recording body metric data (e.g., weight, body fat) into the local SQLite database. This is a Write operation as it adds new records. Severity is medium since misuse could corrupt personal health tracking data. Confidence is reduced due to the empty description, but the name and server context are fairly clear.

From the tool's definition Tool name 'log_body_metrics' combined with server description mentioning 'logging... body metrics through a local SQLite database'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

log_body_metrics Rate-limited

log_body_metrics 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": {
    "log_body_metrics": {
      "limits": [
        {
          "counter": "log_body_metrics_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 MCP Logger, so you can run agents against it safely.

FAQ

Questions about log_body_metrics

What does the log_body_metrics tool do? +

log_body_metrics. It is categorised as a Write tool in the MCP Logger 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_body_metrics? +

Register the MCP Logger MCP server in PolicyLayer and add a rule for log_body_metrics: 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 Logger. Nothing to install.

What risk level is log_body_metrics? +

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

Can I rate-limit log_body_metrics? +

Yes. Add a rate_limit block to the log_body_metrics 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_body_metrics completely? +

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

log_body_metrics is provided by the MCP Logger MCP server (johnzolton/mcp-logger). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.