HaloCreek: Skill for Codex

.codex/skills/avalonia-api-docs/SKILL.md

avalonia-api-docs is a skill for Codex from xianyu603/HaloCreek. It costs 57 tokens per session (538 once invoked), scanned A, original, MIT.

A lookup guide for version-matched Avalonia API documentation. Avalonia is a framework for building cross-platform desktop interfaces with .NET and XAML.

In plain words
What is it for?
Use it when verifying Avalonia controls, properties, methods, XAML behavior, package details, or migration questions in an Avalonia project.
Why use it?
It checks the project’s installed Avalonia version and searches its local API documentation, reducing errors caused by using APIs from a different version.

Skill for Codex

Written for Codex: agents/openai.yaml present. Also seen: mentions Codex.

This is xianyu603/HaloCreek's own configuration. It tells Codex how to work on HaloCreek itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything HaloCreek configures →

Reuse

Borrowing it

Nothing to install: this file belongs to xianyu603/HaloCreek. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/xianyu603/HaloCreek/master/.codex/skills/avalonia-api-docs/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/xianyu603/HaloCreek

Made for: Codex.

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 avalonia-api-docs

README.md
[![agentmods](https://agentmods.dev/badge/skills/xianyu603/halocreek/avalonia-api-docs/github.svg)](https://agentmods.dev/skills/xianyu603/halocreek/avalonia-api-docs)
Your own site
<a href="https://agentmods.dev/skills/xianyu603/halocreek/avalonia-api-docs"><img src="https://agentmods.dev/badge/skills/xianyu603/halocreek/avalonia-api-docs/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 avalonia-api-docs

Your own site · 80×15
<a href="https://agentmods.dev/skills/xianyu603/halocreek/avalonia-api-docs"><img src="https://agentmods.dev/badge/skills/xianyu603/halocreek/avalonia-api-docs.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 538 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 $0.00057 $0.00538
Opus 5 $0.00028 $0.00269
Sonnet 5 $0.00011 $0.00108
Haiku 4.5 $0.00006 $0.00054

Measured 9d ago against content hash dc70320bd97b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

avalonia-api-docs 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 9d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/search_avalonia_docs.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.

.codex/skills/avalonia-api-docs/SKILL.md · 37 lines

How it starts

The opening of the file, as written. The whole thing — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Avalonia API Docs

Workflow

  1. Prefer project-local package documentation over web search.

    • Read the project's obj/project.assets.json to get the exact Avalonia package versions and NuGet package folder.
    • For HaloCreek, the current restored packages are under the Windows NuGet cache path recorded in project.assets.json, for example C:\Users\cuika\.nuget\packages\, which is /mnt/c/Users/cuika/.nuget/packages/ from WSL.
    • Prefer ref/<target-framework>/*.xml for API surface documentation; fall back to lib/<target-framework>/*.xml.
  2. Use the bundled search script for API lookup:

python3 .codex/skills/avalonia-api-docs/scripts/search_avalonia_docs.py WindowStartupLocation
python3 .codex/skills/avalonia-api-docs/scripts/search_avalonia_docs.py ShowDialog Window
python3 .codex/skills/avalonia-api-docs/scripts/search_avalonia_docs.py --list-files
  1. If the local XML docs are missing, run restore/build first if appropriate for the task. In HaloCreek, prefer the repository build skill for build validation.

  2. Use online docs only as secondary context:

    • API reference: https://api-docs.avaloniaui.net/
    • Concept docs: https://docs.avaloniaui.net/
    • Check the displayed version. Do not assume online API pages match the project's restored package version.
  3. When an API remains ambiguous, inspect the referenced assemblies or source package rather than guessing. If the API field, enum value, overload, or XAML syntax cannot be verified, report that explicitly.

Practical Notes

  • HaloCreek targets net10.0 and currently references Avalonia 12.0.3; the local package XML is the most reliable source for that exact API surface.
  • Common XML files are Avalonia.Controls.xml, Avalonia.Base.xml, Avalonia.Markup.Xaml.xml, Avalonia.Desktop.xml, and Avalonia.Themes.Fluent.xml.
  • The script searches XML member names and documentation text, then prints member IDs and compact summaries. Use the member ID to locate exact overloads.

Read the full file on GitHub · 37 lines

Files

What ships with it

2 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. 9d ago First seen · 37 lines · 57 tokens per session scan A dc70320bd97b

Subscribe to this mod's changes

avalonia-api-docs is a skill published in the GitHub repository xianyu603/HaloCreek (1 stars, last pushed 12d ago), licensed MIT. It adds 57 tokens to every session and 538 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 2026-08-31.

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