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lop_import

Import a USD file into a Houdini scene as a reference or sublayer, specifying the target path and optional prim path.

Instructions

Import a USD file via reference or sublayer.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fileYes
pathYes
methodNoreference
prim_pathNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.7/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full behavioral burden. It implies a stage mutation but does not state whether a stage must exist, whether the import is reversible, what path/prim_path refer to, or what the side effects are. This is a significant gap for a write operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

A single front-loaded sentence with no filler or redundancy. It is efficient, though arguably under-specified rather than genuinely well-scoped.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Although an output schema exists so return values need not be explained, the combination of 4 undocumented parameters, zero annotations, and an unclear mutation context leaves the definition inadequate. An agent cannot confidently invoke this with the given information.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% with 4 parameters, and the description only loosely gestures at 'file' and the 'method' (reference/sublayer). The required 'path' and optional 'prim_path' are left entirely undefined in both schema and description, so the description does not compensate for the coverage gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb (import) and resource (USD file) plus the mechanism (reference or sublayer), so the core action is clear. It does not differentiate from sibling USD/LOP importers like import_fbx_character, but the purpose itself is unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no when-to-use guidance, no mention of prerequisites (e.g. an existing stage or LOP node context), and no routing to alternatives such as import_fbx_character or lop_layer_info. The choice between 'reference' and 'sublayer' methods is never explained.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.