roles_sync · Claude Role Library MCP: Risk & Policy

WHAT IT DOES

What roles_sync does on Claude Role Library

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

WHY IT NEEDS A POLICY

Why roles_sync needs a policy

This tool fetches an updated version of a role from an external source and writes/overwrites the local copy with new content. It modifies local data (the role definition) by replacing it with the latest version from the source. While it could be considered reversible if backups exist, it overwrites existing role data. It's not purely Read (it modifies local state) and not Destructive (it's updating, not deleting).

From the tool's definition Sync a role from its source to get latest version

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

roles_sync Rate-limited

roles_sync 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": {
    "roles_sync": {
      "limits": [
        {
          "counter": "roles_sync_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 Claude Role Library, so you can run agents against it safely.

FAQ

Questions about roles_sync

What does the roles_sync tool do? +

Sync a role from its source to get latest version. It is categorised as a Write tool in the Claude Role Library MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on roles_sync? +

Register the Claude Role Library MCP server in PolicyLayer and add a rule for roles_sync: 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 Claude Role Library. Nothing to install.

What risk level is roles_sync? +

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

Can I rate-limit roles_sync? +

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

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

roles_sync is provided by the Claude Role Library MCP server (tony427/claude-role-library). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.