selection_set

Replace the editor's node selection with the given node paths.

SERVERBreakpoint SOURCEbreakpoint-mcp

Medium RISK CLASS

Category Write

Parameters 11 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/breakpoint-mcp/selection-set.md

WHAT IT DOES

What selection_set does on Breakpoint

AI agents use selection_set 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
`paths`	array	Yes	Node paths relative to the scene root

Parameters from the server's own tool schema.

RISK

Why selection_set is rated Medium

This tool modifies editor state by replacing the current selection, which is a reversible change (the user can select different nodes afterward). It does not execute arbitrary code, delete data permanently, or affect financial systems.

From the tool's definition Tool description states "Replace the editor's node selection with the given node paths" — the verb "Replace" indicates a modification operation that changes editor state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs selection_set 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 selection_set, this is the rule to start with:

selection_set Rate-limited

selection_set 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": {
    "selection_set": {
      "limits": [
        {
          "counter": "selection_set_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 selection_set call is checked against it from then on.

FAQ

Questions about selection_set

What does the selection_set tool do? +

Replace the editor's node selection with the given node paths. 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 selection_set accept? +

selection_set accepts 1 parameter: paths. Required: paths. The full parameter table on this page comes from the server's own tool schema.

How do I enforce a policy on selection_set? +

Register the Breakpoint MCP server in PolicyLayer and add a rule for selection_set: 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 selection_set? +

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

Can I rate-limit selection_set? +

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

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

selection_set 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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