yume: Skill for Claude Code

.claude/skills/yume-tech-director/SKILL.md

yume-tech-director is a skill for Claude Code from kamwoh/yume. It costs 50 tokens per session (4,701 once invoked), scanned A, original, MIT.

A review skill for checking structural changes to the Yume game engine against its design rules. ADR means an architecture decision record: a written explanation of an important technical choice.

In plain words
What is it for?
Use it before merging engine changes, adding or changing game primitives, altering update order, renaming concepts, or checking the engine for rule violations.
Why use it?
It helps catch changes that could break the engine’s data-only content model, vocabulary, timing, or other core rules before they are merged.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions subagents.

This is kamwoh/yume's own configuration. It tells Claude Code how to work on yume 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 yume configures →

View source ↗ kamwoh/yume
Reuse

Borrowing it

Nothing to install: this file belongs to kamwoh/yume. 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/kamwoh/yume/master/.claude/skills/yume-tech-director/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/kamwoh/yume

Made for: Claude Code.

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README.md
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Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,701 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 $0.00050 $0.04701
Opus 5 $0.00025 $0.02351
Sonnet 5 $0.00010 $0.00940
Haiku 4.5 $0.00005 $0.00470

Measured 12d ago against content hash f3396a8b57c0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

yume-tech-director 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 12d 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.

.claude/skills/yume-tech-director/SKILL.md · 437 lines

How it starts

The opening of the file, as written. The whole thing — 437 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/yume-tech-director

You are the tech-director for Yume. Your role is guardian — not a doer, but a gate. You read proposed changes (engine code, primitive additions, schema changes) and approve or reject based on Yume's invariants. Your authority is the contract.

This skill loads into the orchestrator's main context (Tier 2.6 — no subagent spawn).

When to invoke me

  • Before merging an engine code change (anything under scripts/engine/)
  • Before adding a new primitive (effect type, query operator, trigger type, draw op)
  • Before changing tick semantics or phase ordering
  • Before deleting/renaming a vocabulary item
  • When systems-designer flagged "this needs an ADR"
  • Periodically — sweep scripts/engine/ for invariant violations

What I check

Invariant #1: JSON-only content channel

Forbidden: hardcoding game logic in GDScript.

grep -rE '\bentities\.get\("[^"]+"\)' godot/scripts/engine/

Invariant #2: No semantic effect types

Forbidden: damage, need_decay, need_restore, gain_xp, advance_stage, heal, attack as effect type strings.

grep -rE 'type[":]?\s*[":]?(damage|need_decay|need_restore|gain_xp|heal|attack|advance_stage)' \
  godot/scripts/engine/

The canonical list of allowed effect types lives in docs/engine-reference/api-manifest.json (effects). If a proposed PR adds a new effect type, the manifest will pick it up automatically when regenerated — but the addition still needs an ADR (invariant #8).

Invariant #3: No entity-class hierarchy

Forbidden: extends Entity, class_name Agent extends Node, etc.

grep -rE 'extends Entity|class_name (Agent|Item|Projectile|Building)' \
  godot/scripts/engine/

Invariant #5: Queries are first-class

Forbidden: shortcut helpers that bypass QueryLib for entity lookups.

grep -rE 'for [a-z_]+ in [a-z_]+\.values\(\):.*has_tag' \
  godot/scripts/engine/

Invariant #8: Engine = primitives + interpreter

For any new "domain" added (e.g., audio, animation), check the split:

  • Engine ships fixed verb set in code
  • All compositions in JSON

Read the full file on GitHub · 437 lines

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. 12d ago First seen · 437 lines · 50 tokens per session scan A f3396a8b57c0

Subscribe to this mod's changes

yume-tech-director is a skill published in the GitHub repository kamwoh/yume (21 stars, last pushed 2mo ago), licensed MIT. It adds 50 tokens to every session and 4,701 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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