update_family_variant · BotUyo MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_family_variant does on BotUyo MCP Server

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

WHY IT NEEDS A POLICY

Why update_family_variant needs a policy

This tool creates or modifies data reversibly—it updates variant properties within an agent family configuration without deleting the underlying data or triggering external operations. This is characteristic of a Write operation. Severity is medium because misuse could alter agent behavior and routing (handoffTargets), but the changes are reversible and scoped to a single variant record.

From the tool's definition Tool description states 'Update a single variant' with modifiable fields (label/overrides/handoffTargets/order). The word 'Update' and the ability to modify variant configuration indicates data modification.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_family_variant Rate-limited

update_family_variant 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": {
    "update_family_variant": {
      "limits": [
        {
          "counter": "update_family_variant_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 BotUyo MCP Server, so you can run agents against it safely.

FAQ

Questions about update_family_variant

What does the update_family_variant tool do? +

Update a single variant (label/overrides/handoffTargets/order) by its key. The variant key itself. It is categorised as a Write tool in the BotUyo 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 update_family_variant? +

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

What risk level is update_family_variant? +

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

Can I rate-limit update_family_variant? +

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

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

update_family_variant is provided by the BotUyo MCP Server MCP server (marcoar1/botuyo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.