houdini-usd-lops

houdini-usd-lops is a skill for Claude Code from dcc-mcp/dcc-mcp-houdini. It costs 53 tokens per session (456 once invoked), scanned A, original, MIT.

A read-only workflow for inspecting the composed USD scene inside a Houdini LOP node. USD is a format and scene system for describing 3D objects, their properties, transforms, materials, and visibility.

In plain words
What is it for?
Listing scene objects called prims, inspecting a selected prim’s type and state, and reading filtered attribute values at a chosen time.
Why use it?
It helps agents examine what the node graph currently produces without authoring, importing, or exporting USD data. Bounded reads keep large scenes manageable.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Good fit Listing scene objects called prims, inspecting a selected prim’s type and state, and reading filtered attribute values at a chosen time.

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Install with agentmods
npx agentmods add skills/dcc-mcp/dcc-mcp-houdini/houdini-usd-lops
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add dcc-mcp/dcc-mcp-houdini --skill houdini-usd-lops
Clone the repo
git clone --depth 1 https://github.com/dcc-mcp/dcc-mcp-houdini

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for houdini-usd-lops

README.md
[![agentmods](https://agentmods.dev/badge/skills/dcc-mcp/dcc-mcp-houdini/houdini-usd-lops/github.svg)](https://agentmods.dev/skills/dcc-mcp/dcc-mcp-houdini/houdini-usd-lops)
Your own site
<a href="https://agentmods.dev/skills/dcc-mcp/dcc-mcp-houdini/houdini-usd-lops"><img src="https://agentmods.dev/badge/skills/dcc-mcp/dcc-mcp-houdini/houdini-usd-lops/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for houdini-usd-lops

Your own site · 80×15
<a href="https://agentmods.dev/skills/dcc-mcp/dcc-mcp-houdini/houdini-usd-lops"><img src="https://agentmods.dev/badge/skills/dcc-mcp/dcc-mcp-houdini/houdini-usd-lops.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 456 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00053 $0.00456
Opus 5 $0.00026 $0.00228
Sonnet 5 $0.00011 $0.00091
Haiku 4.5 $0.00005 $0.00046

Measured 11d ago against content hash 6758c3409a28, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

houdini-usd-lops scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (scripts/_usd_common.py, scripts/get_prim_attributes.py, scripts/get_prim_info.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

src/dcc_mcp_houdini/skills/houdini-usd-lops/SKILL.md · 48 lines

What it actually says

houdini-usd-lops

Read-only inspection of the composed USD Stage returned by a LOP node.

  1. list_stage_prims for a bounded Stage inventory.
  2. get_prim_info for type, state, visibility, transform, bounds, and material binding.
  3. get_prim_attributes for filtered, size-bounded attribute values at a time code.

Load houdini-interchange instead when the task is file import or export.

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 11d ago First seen · 48 lines · 53 tokens per session scan A 6758c3409a28

Subscribe to this mod's changes

houdini-usd-lops is a skill published in the GitHub repository dcc-mcp/dcc-mcp-houdini (12 stars, last pushed today), licensed MIT. It adds 53 tokens to every session and 456 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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