add_space_role_members · Huly MCP: Risk & Policy

WHAT IT DOES

What add_space_role_members does on Huly

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

WHY IT NEEDS A POLICY

Why add_space_role_members needs a policy

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

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_space_role_members Rate-limited

add_space_role_members 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": {
    "add_space_role_members": {
      "limits": [
        {
          "counter": "add_space_role_members_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 Huly, so you can run agents against it safely.

FAQ

Questions about add_space_role_members

What does the add_space_role_members tool do? +

Idempotently add members to one role on a typed Huly space while preserving all other role assignments. Role accepts a raw role _id or exact role name from the space. It is categorised as a Write tool in the Huly MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_space_role_members? +

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

What risk level is add_space_role_members? +

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

Can I rate-limit add_space_role_members? +

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

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

add_space_role_members is provided by the Huly MCP server (@firfi/huly-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.