runtime_assert_scene_structure
Assert the LIVE SceneTree matches structural expectations (read-only). Each entry asserts a node exists at a path (and, if given, is of a class via is_class); set absent:true to assert it is NOT present.
This record as markdown: /tools/breakpoint-mcp/runtime-assert-scene-structure.md
What runtime_assert_scene_structure does on Breakpoint
AI agents call runtime_assert_scene_structure to retrieve information from Breakpoint without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
| Parameter | Type | Required | Description |
|---|---|---|---|
peer | string | — | Target a headless peer by id (from runtime_spawn_peers). Omit to address the default running game. |
expect | array | Yes | List of node expectations: {path, type?, absent?}. |
Parameters from the server's own tool schema.
Why runtime_assert_scene_structure is rated Low
The tool is explicitly marked as read-only and only checks/asserts structural expectations against the live scene tree without modifying any data. It reads node paths and class types to validate structure.
From the tool's definition Assert the LIVE SceneTree matches structural expectations (read-only)
Risk signalsAccepts file system path (expect[].path)
Attacks that exploit this kind of access
The rule that runs runtime_assert_scene_structure 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 runtime_assert_scene_structure, this is the rule to start with:
runtime_assert_scene_structure is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Breakpoint, apply this rule, and every runtime_assert_scene_structure call is checked against it from then on.
Questions about runtime_assert_scene_structure
Assert the LIVE SceneTree matches structural expectations (read-only). Each entry asserts a node exists at a path (and, if given, is of a class via is_class); set absent:true to assert it is NOT present. It is categorised as a Read tool in the Breakpoint MCP Server, which means it retrieves data without modifying state.
runtime_assert_scene_structure accepts 2 parameters: peer, expect. Required: expect. The full parameter table on this page comes from the server's own tool schema.
Register the Breakpoint MCP server in PolicyLayer and add a rule for runtime_assert_scene_structure: 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.
runtime_assert_scene_structure is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the runtime_assert_scene_structure 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 runtime_assert_scene_structure. 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.
runtime_assert_scene_structure 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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