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Asset Spec · donchitos | DecimalAI

design mediaby donchitos

Asset Spec

donchitos/asset-spec

Source donchitos/claude-code-game-studios ↗License MIT

Generate per-asset visual specifications and AI generation prompts from GDDs, level docs, or character profiles. Produces structured spec files and updates the master asset manifest. Run after art bible and GDD/level design are approved, before production begins.

SkillScore55Maintained

Automatic

Design & UX Review pack

Last verified 9/23/2026

What it changes

Passed 7 of 13 test cases with the skill, and 4 of 13 without it.

Without skill32%

With skill55%

Checks it passed that the model alone missed

Surfaces the agent BLOCKED error message immediately.
Spawns only art-director during Phase 3 in lean review mode.
Produces a partial asset spec without discarding completed work.

and 6 more in the full report

8 fixed4 passed either way7 still failing3 broke

Pass-rate lift: +23 pp
Tokens: +194%
Agent turns: 0%
Response time: -42%

Model gemini-3.6-flashMeasured 9/23/2026v2 · latest is v412 of 22 cases passed with skill · 13 comparable

Tokens, turns and time describe resource use, not a dollar price.

This benchmark measured an earlier version of the skill.

A newer attempt on gemini-3.6-flash on 10/13/2026 did not produce a publishable comparison (not comparable). The snapshot above is the previously measured run.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/donchitos-asset-spec/SKILL.md https://app.decimal.ai/s/donchitos-asset-spec/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add donchitos-asset-spec, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/donchitos-asset-spec/ and pins it in .decimal/skills.lock

decimalai skills add donchitos-asset-spec

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/donchitos-asset-spec/SKILL.md https://app.decimal.ai/s/donchitos-asset-spec/SKILL.md

Raw file: /s/donchitos-asset-spec/SKILL.md ↗ · machine-readable summary at /s/donchitos-asset-spec.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

Run asset spec generation for system `magic-combat` with review mode explicitly set to `--review lean`. Which specialist agents should be invoked during Phase 3?

What was checked, without and with the skill
Checked	Without skill	With skill
Spawns only art-director during Phase 3 in lean review mode.	Missed	Passed

case-12 · gemini-3.6-flash · 9/23/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md403 linessingle file

!bash "${CLAUDE_SKILL_DIR}/../../hooks/yaml-helper.sh" resolve_config --keys review_mode,automation

Asset Spec

If no argument is provided, check whether design/assets/entity-inventory.md exists:

If it exists: read it, find the first entity or screen with status "Needed" but no spec file yet, and use AskUserQuestion:
- Prompt: "The next unspecced item is [name]. Generate specs for it?"
- Options: [A] Yes — spec [name] / [B] Pick a different item / [C] Stop here
If no entity inventory: check design/assets/asset-manifest.md. If manifest exists, same flow above but reading from manifest.
If neither exists: start the Entity & Screen Inventory flow (Phase 0b below) rather than failing.

Every AskUserQuestion call follows .claude/docs/automation-modes.md (collaborative asks always · guided major-only · autonomous logs and proceeds; automation_always_ask categories always prompt). Note: actually invoking an external image generator (calling an image API) always prompts regardless of modes.automation — it is an irreversible external action guarded unconditionally, independent of whether external_calls is listed in automation_always_ask. (Today this skill only emits generation-prompt text; the guard applies if live generation is ever wired in.)

Phase 0b: Entity & Screen Inventory (runs when no arguments and no existing inventory)

This flow produces design/assets/entity-inventory.md — the master list of everything the game needs visually. Run once before asset spec work begins.

Step 1 — Gather from docs

Read all available source material in parallel:

design/gdd/systems-index.md — extract every system listed
GDD asset content — do not full-read every GDD. The two wanted sections are standard headings, and named entities live in the registry:
```
Grep pattern="## (Visual/Audio Requirements|UI Requirements)" glob="design/gdd/*.md" output_mode="content" -A 25
```
For named entities (characters, enemies, buildings, items), read design/registry/entities.yaml (entities/items) if it exists and has entries; otherwise grep the GDDs for named content. Full-read a GDD only when

Track record

Benchmark

7 / 13

test cases passed, vs 4 / 13 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v5 — 10/8/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

donchitos / claude-code-game-studios

.claude/skills/asset-spec/SKILL.md

View on GitHub ↗

License MITImported 10/8/2026Version v4

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Asset Spec

Phase 0b: Entity & Screen Inventory (runs when no arguments and no existing inventory)

Step 1 — Gather from docs

Track record

Benchmark

Adoption

SkillSafety

Source

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