axle_merge · Axle MCP: Risk & Policy

WHAT IT DOES

What axle_merge does on Axle

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

WHY IT NEEDS A POLICY

Why axle_merge needs a policy

An AI agent can call axle_merge faster than any human can review — one bad instruction and it creates or modifies resources in Axle by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

axle_merge Rate-limited

axle_merge 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": {
    "axle_merge": {
      "limits": [
        {
          "counter": "axle_merge_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 Axle, so you can run agents against it safely.

FAQ

Questions about axle_merge

What does the axle_merge tool do? +

axle_merge. It is categorised as a Write tool in the Axle MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on axle_merge? +

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

What risk level is axle_merge? +

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

Can I rate-limit axle_merge? +

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

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

axle_merge is provided by the Axle MCP server (vilin97/axle-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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