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Agent skill

Skyrim Creature System

by bryantmh in bryantmh/tes4skyrim

Complete reference for how a creature (wolf, draugr, dragon, etc.) works in Skyrim (TES5) — the RACE record hookup, the NIF mesh, the skeleton.hkx (animation skeleton + ragdoll + skeleton mappers)…

No licenceAuto-check passedDevelopment

Install Skyrim Creature System

skills CLI
$ npx skills add bryantmh/tes4skyrim --skill skyrim-creature-system -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install bryantmh/tes4skyrim skyrim-creature-system --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/bryantmh/tes4skyrim.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/skyrim-creature-system .claude/skills/skyrim-creature-system && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
skyrim-creature-system
GitHub stars
130
Token cost
~4.5k tokens
SKILL.md length
1,409 words
Files
7 (incl. references)
Skills in repo
5
Repo updated
First seen
Licence
None found

At a glance

Complete reference for how a creature (wolf, draugr, dragon, etc.) works in Skyrim (TES5) — the RACE record hookup, the NIF mesh, the skeleton.hkx (animation skeleton + ragdoll + skeleton mappers)…

  • Works in 9 steps: The big picture — the whole chain in one… → The ESM side — the RACE record → The mesh (NIF) → …
  • Converting Skyrim creature assets
  • SKILL.md covers 0. The big picture — the whole…, 1. The ESM side — the RACE…, 2. The mesh (NIF) and 3. The skeleton and ragdoll…, plus 5 more sections
  • Calls python

What it does

Skyrim Creature System is an agent skill from bryantmh/tes4skyrim. Complete reference for how a creature (wolf, draugr, dragon, etc.) works in Skyrim (TES5) — the RACE record hookup, the NIF mesh, the skeleton.hkx (animation skeleton + ragdoll + skeleton mappers), the behavior graph .hkx files (state machines, clip generators, events, variables), and the animationdata / animationsetdata text cache formats. Use when authoring, reading, debugging, or converting Skyrim creature assets, when you need the exact binary layout of any Havok class in a creature file, the exact…

Its SKILL.md is about 4.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files (for example `references/animation_cache.md`, `references/behavior_graph.md` and `references/creature_nif.md`).

It sits in Development. The repository describes itself as: Complete and automated Gamebryo to TES5 plugin and asset conversion.

When your agent uses it

  • Converting Skyrim creature assets
  • You need the exact binary layout of any Havok class in a creature file
  • The exact line-by-line format of the animation cache text files
  • The exact chain that turns a game event into a playing animation

Example prompts

  • “/skyrim-creature-system”

Workflow steps

9 steps, taken from the step headings in SKILL.md.

  1. The big picture — the whole chain in one place
  2. The ESM side — the RACE record
  3. The mesh (NIF)
  4. The skeleton and ragdoll (skeleton.hkx)
  5. The behavior graph
  6. The animation cache text files
  7. Events and variables — the runtime vocabulary
  8. Verification recipes
  9. Known traps

What it can do on your machine

Read from SKILL.md and the folder at commit 0174e9d. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • python

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Skyrim Creature System loads about 4.5k tokens when it runs, and up to ~30k if it reads all its reference files. Until then it costs about 184 tokens; SKILL.md has 1,409 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~184
When it runs · the whole SKILL.md, loaded when a task matches
~4.5k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~30k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Without a licence we can't republish the file, so here is its outline and opening line. It has 1,409 words (~4,488 tokens).

“Every fact here was verified against real vanilla Skyrim assets (byte-level), the HKX2-Enhanced-Library auto-generated Havok class definitions, Haviour's hkclass.inl (official Havok enum documentation), the Skyrim Behavior Editor C++ parsers, xEdit's record definitions, and the Creation Kit wiki. Where a fact…”

— opening of SKILL.md by bryantmh
name
skyrim-creature-system

Read the full SKILL.md on GitHub

Files

SKILL.md and 6 other files (references) in .claude/skills/skyrim-creature-system of bryantmh/tes4skyrim.

  • SKILL.md
  • references/animation_cache.md
  • references/behavior_graph.md
  • references/creature_nif.md
  • references/hkx_container.md
  • references/skeleton_ragdoll.md
  • references/worked_example_wolf.md

Open the folder on GitHubat commit 0174e9d

Compare with similar skills

Skyrim Creature System next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Skyrim Creature System compared with similar skills
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Skyrim Creature System this skillbryantmh/tes4skyrim130—~4.5kAutomated safety check: PassNone
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Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Skyrim Creature System

What does Skyrim Creature System do?

Complete reference for how a creature (wolf, draugr, dragon, etc.) works in Skyrim (TES5) — the RACE record hookup, the NIF mesh, the skeleton.hkx (animation skeleton + ragdoll + skeleton mappers)…. Skyrim Creature System is an agent skill from bryantmh/tes4skyrim.hkx files (state machines, clip generators, events, variables), and the animationdata / animationsetdata text cache formats.

When should I use Skyrim Creature System?

Skyrim Creature System fits situations like: converting Skyrim creature assets; you need the exact binary layout of any Havok class in a creature file; the exact line-by-line format of the animation cache text files; the exact chain that turns a game event into a playing animation.

How do I install Skyrim Creature System in Claude Code?

Run `npx skills add bryantmh/tes4skyrim --skill skyrim-creature-system -a claude-code`. Or copy the skill folder (.claude/skills/skyrim-creature-system in bryantmh/tes4skyrim) into .claude/skills/skyrim-creature-system in your project. Claude Code loads it when a task matches its description.

How do I install Skyrim Creature System in Codex?

Run `npx skills add bryantmh/tes4skyrim --skill skyrim-creature-system -a codex`. Or copy the skill folder (.claude/skills/skyrim-creature-system in bryantmh/tes4skyrim) into .agents/skills/skyrim-creature-system in your project. Codex loads it when a task matches its description.

Can I use Skyrim Creature System in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add bryantmh/tes4skyrim --skill skyrim-creature-system -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skyrim-creature-system, .gemini/skills/skyrim-creature-system, .github/skills/skyrim-creature-system and .opencode/skills/skyrim-creature-system in your project.

What does Skyrim Creature System need to run?

Going by SKILL.md and its folder, Skyrim Creature System needs the command-line tools its instructions call (python).

Does Skyrim Creature System access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Skyrim Creature System safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Skyrim Creature System use?

No licence was found for Skyrim Creature System or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Skyrim Creature System use?

About 4.5k tokens (SKILL.md is roughly 18k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 26k tokens, read only when the agent opens those files.

What are the alternatives to Skyrim Creature System?

Skills that share tags, products or a category with Skyrim Creature System: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Skyrim Creature System?

bryantmh (a GitHub user) maintains it in bryantmh/tes4skyrim, which has 130 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 11, 2026.

Source: bryantmh/tes4skyrim on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.