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bpx-prop

bpx-prop is a skill for Claude Code from wilddogjp/openbpx. It costs 23 tokens per session (566 once invoked), scanned A, original, Apache-2.0.

A command set for reading and changing decoded properties in one export of an Unreal Engine asset file.

In plain words
What is it for?
Use it to list an export’s properties, update an existing value, add a top-level property from JSON, or remove a property by path.
Why use it?
It provides a focused way to inspect property values and make targeted changes, additions, or removals instead of editing the binary file directly.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is **PREREQUISITE:** Read [bpx-shared](../bpx-shared/SKILL.md)..

Part of the openbpx plugin — 26 skills shipped together

not rated 99repo 2mo ago A scan 23 tokens original Apache-2.0

Good fit Use it to list an export’s properties, update an existing value, add a top-level property from JSON, or remove a property by path.

Compare 6 skills from other repositories ↓
View source ↗ wilddogjp/openbpx
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/wilddogjp/openbpx
agentmods
npx agentmods add skills/wilddogjp/openbpx/bpx-prop

Made for: Claude Code.

Or install openbpx, the plugin that ships this one along with the rest of its 26 skills.

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 bpx-prop

README.md
[![agentmods](https://agentmods.dev/badge/skills/wilddogjp/openbpx/bpx-prop.svg)](https://agentmods.dev/skills/wilddogjp/openbpx/bpx-prop)
Your own site
<a href="https://agentmods.dev/skills/wilddogjp/openbpx/bpx-prop"><img src="https://agentmods.dev/badge/skills/wilddogjp/openbpx/bpx-prop.svg" alt="Measured on agentmods" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 566 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 $0.00023 $0.00566
Opus 5 $0.00012 $0.00283
Sonnet 5 $0.00005 $0.00113
Haiku 4.5 $0.00002 $0.00057

Measured 8d ago against content hash 34f33bb7e9ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

bpx-prop 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 8d ago.

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.

plugins/openbpx/skills/bpx-prop/SKILL.md · 52 lines

What it actually says

prop

PREREQUISITE: Read bpx-shared.

Usage

bpx prop list <file.uasset> --export <n>
bpx prop set <file.uasset> --export <n> --path <dot.path> --value '<json>' [--dry-run] [--backup]
bpx prop add <file.uasset> --export <n> --spec '<json>' [--dry-run] [--backup]
bpx prop remove <file.uasset> --export <n> --path <dot.path> [--dry-run] [--backup]

Behavior

  • list: decodes properties for one export and includes warnings.
  • set: updates an existing property value at --path.
  • add: appends a new top-level property from --spec JSON.
  • remove: removes a property at --path.
  • Write subcommands report old/new values, size deltas, and changed-byte status.

[!CAUTION] This command includes write-capable operations. Confirm intent and run --dry-run first.

Command Matrix

Command Use when Notable defaults
list decodes properties for one export and includes warnings. Read-only path; safe for discovery.
set updates an existing property value at --path. Run --dry-run first and use --backup for real writes.
add appends a new top-level property from --spec JSON. Run --dry-run first and use --backup for real writes.
remove removes a property at --path. Run --dry-run first and use --backup for real writes.

Code-Aligned Caveats

  • Write paths mutate one export only; invalid dot paths fail explicitly.
  • Prefer prop list immediately before prop set/add/remove to avoid stale assumptions.

High-Signal Examples

bpx prop list ./Sample.uasset --export 1
bpx prop set ./Sample.uasset --export 1 --path MyProperty --value '{"value":1}' [--dry-run] [--backup]
bpx prop add ./Sample.uasset --export 1 --spec '{"value":1}' [--dry-run] [--backup]
bpx prop remove ./Sample.uasset --export 1 --path MyProperty [--dry-run] [--backup]
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. 8d ago First seen · 52 lines · 23 tokens per session scan A 34f33bb7e9ef

Subscribe to this mod's changes

bpx-prop is a skill published in the GitHub repository wilddogjp/openbpx (99 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 23 tokens to every session and 566 once invoked, about $0.0001 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.

Game development
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