node_add_to_group

Add a node to a group (persistent, undoable). No-op if already a member.

SERVERBreakpoint SOURCEbreakpoint-mcp

Medium RISK CLASS

Category Write

Parameters 22 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/breakpoint-mcp/node-add-to-group.md

WHAT IT DOES

What node_add_to_group does on Breakpoint

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

Parameter	Type	Required	Description
`path`	string	Yes	Node path relative to the scene root
`group`	string	Yes	Group name

Parameters from the server's own tool schema.

RISK

Why node_add_to_group is rated Medium

This tool modifies group membership by adding a node, which is a state change. The explicit mention of 'undoable' confirms the change is reversible, placing it in Write rather than Destructive. The medium severity reflects that group modifications affect node organization and potentially behavior, but the impact is contained and reversible.

From the tool's definition Tool description states 'Add a node to a group (persistent, undoable)'. The 'persistent' and 'undoable' qualifiers indicate this creates/modifies state in a reversible manner, characteristic of Write operations.

Risk signalsAccepts file system path (path)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs node_add_to_group safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Breakpoint, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For node_add_to_group, this is the rule to start with:

node_add_to_group Rate-limited

node_add_to_group 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": {
    "node_add_to_group": {
      "limits": [
        {
          "counter": "node_add_to_group_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Breakpoint, apply this rule, and every node_add_to_group call is checked against it from then on.

FAQ

Questions about node_add_to_group

What does the node_add_to_group tool do? +

Add a node to a group (persistent, undoable). No-op if already a member. It is categorised as a Write tool in the Breakpoint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

What parameters does node_add_to_group accept? +

node_add_to_group accepts 2 parameters: path, group. Required: path, group. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on node_add_to_group? +

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

What risk level is node_add_to_group? +

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

Can I rate-limit node_add_to_group? +

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

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

node_add_to_group is provided by the Breakpoint MCP server (breakpoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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