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get_usd_attribute

Retrieve a specific USD attribute value from a prim path in a live Houdini session to inspect USD scene data.

Instructions

Get a specific USD attribute value.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
pathYes
attr_nameYes
prim_pathYes

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.4/5.0
Behavior2/5

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

No annotations are provided, so the description must carry the behavioral burden. 'Get' implies a read-only operation, but the description does not state error behavior for missing paths or attributes, permission requirements, or whether any side effects exist.

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

Conciseness3/5

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

The description is a single front-loaded sentence with no filler. It is appropriately concise for a short statement, though arguably too terse given the three required parameters and lack of supporting context.

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?

An output schema exists, so return values need not be explained. However, with no annotations and 0% input schema description coverage, the description is incomplete: it omits all parameter semantics and any usage context needed to call the tool reliably.

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

Parameters1/5

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

Schema description coverage is 0% across three required parameters: path, prim_path, and attr_name. The description adds no explanation of any parameter's meaning, format, or expected value, which is a severe gap for correctly invoking the tool.

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 states a specific verb and resource: 'Get a specific USD attribute value.' It is clear enough to distinguish from the sibling set_usd_attribute, though it does not explicitly name alternatives or scope like prim path.

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?

No when-to-use guidance, prerequisites, or alternatives are provided. The agent can infer it is for reading rather than writing, but nothing routes it between this tool and list_usd_prims, get_usd_composition, or inspect_usd_layer.

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