node_instantiate_scene
Instance an external PackedScene (res:// path) as an editable child of a parent node (undoable). Returns the new node
This record as markdown: /tools/godot-breakpoint-mcp/node-instantiate-scene.md
What node_instantiate_scene does on Godot Breakpoint
AI agents use node_instantiate_scene to create or update resources in Godot Breakpoint, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Godot Breakpoint environment.
Why node_instantiate_scene is rated Medium
This tool creates a new node by instantiating a PackedScene and adds it as a child of a parent node. It is explicitly marked as undoable, meaning it is reversible. This is a Write operation — it modifies the scene tree by adding a new node, but does not delete/overwrite existing data irreversibly, execute arbitrary code, or involve financial transactions.
From the tool's definition Instance an external PackedScene (res:// path) as an editable child of a parent node (undoable). Returns the new node
Attacks that exploit this kind of access
The rule that runs node_instantiate_scene safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Godot Breakpoint, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For node_instantiate_scene, this is the rule to start with:
node_instantiate_scene 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Godot Breakpoint, apply this rule, and every node_instantiate_scene call is checked against it from then on.
Questions about node_instantiate_scene
Instance an external PackedScene (res:// path) as an editable child of a parent node (undoable). Returns the new node. It is categorised as a Write tool in the Godot Breakpoint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Godot Breakpoint MCP server in PolicyLayer and add a rule for node_instantiate_scene: 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 Godot Breakpoint. Nothing to install.
node_instantiate_scene is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the node_instantiate_scene 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.
Set action: deny in the PolicyLayer policy for node_instantiate_scene. 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.
node_instantiate_scene is provided by the Godot Breakpoint MCP server (jlivingston-Cipher/godot-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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