detach_group_policy · Finch MCP Server MCP: Risk & Policy

WHAT IT DOES

What detach_group_policy does on Finch MCP Server

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

WHY IT NEEDS A POLICY

Why detach_group_policy needs a policy

The name 'detach_group_policy' strongly implies removing/detaching an IAM-style policy from a group, which modifies access control configuration. This is a Write operation (reversible — policy can be re-attached), but has high severity because removing policies from groups can inadvertently grant or revoke permissions at scale. Confidence is reduced due to the empty description.

From the tool's definition Tool name: detach_group_policy — description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

detach_group_policy Rate-limited

detach_group_policy 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": {
    "detach_group_policy": {
      "limits": [
        {
          "counter": "detach_group_policy_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 Finch MCP Server, so you can run agents against it safely.

FAQ

Questions about detach_group_policy

What does the detach_group_policy tool do? +

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

How do I enforce a policy on detach_group_policy? +

Register the Finch MCP Server MCP server in PolicyLayer and add a rule for detach_group_policy: 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 Finch MCP Server. Nothing to install.

What risk level is detach_group_policy? +

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

Can I rate-limit detach_group_policy? +

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

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

detach_group_policy is provided by the Finch MCP Server MCP server (awslabs.finch-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.