l6e_record_usage · L6e MCP: Risk & Policy

WHAT IT DOES

What l6e_record_usage does on L6e

AI agents use l6e_record_usage to create or update resources in L6e — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your L6e environment.

WHY IT NEEDS A POLICY

Why l6e_record_usage needs a policy

This tool writes/updates billing/usage records by reconciling a pending call with actual token usage. It is a reversible write operation (updating a record), not destructive. The idempotency note confirms it modifies existing data. Severity is low since misuse would at worst result in inaccurate usage records rather than financial transactions or data loss.

From the tool's definition Reconcile a pending call with actual token usage after the call completes. Idempotent for the same values on the same call_id.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

l6e_record_usage Rate-limited

l6e_record_usage 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": {
    "l6e_record_usage": {
      "limits": [
        {
          "counter": "l6e_record_usage_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 L6e, so you can run agents against it safely.

FAQ

Questions about l6e_record_usage

What does the l6e_record_usage tool do? +

Reconcile a pending call with actual token usage after the call completes. Idempotent for the same values on the same call_id. It is categorised as a Write tool in the L6e MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on l6e_record_usage? +

Register the L6e MCP server in PolicyLayer and add a rule for l6e_record_usage: 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 L6e. Nothing to install.

What risk level is l6e_record_usage? +

l6e_record_usage is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit l6e_record_usage? +

Yes. Add a rate_limit block to the l6e_record_usage 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 l6e_record_usage completely? +

Set action: deny in the PolicyLayer policy for l6e_record_usage. 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 l6e_record_usage? +

l6e_record_usage is provided by the L6e MCP server (l6e-ai/l6e-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.