Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add simiancraft/simiancraft-skills --skill asset-optimizationgit clone --depth 1 https://github.com/simiancraft/simiancraft-skillsWrote 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.
[](https://agentmods.dev/skills/simiancraft/simiancraft-skills/asset-optimization)<a href="https://agentmods.dev/skills/simiancraft/simiancraft-skills/asset-optimization"><img src="https://agentmods.dev/badge/skills/simiancraft/simiancraft-skills/asset-optimization/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.
<a href="https://agentmods.dev/skills/simiancraft/simiancraft-skills/asset-optimization"><img src="https://agentmods.dev/badge/skills/simiancraft/simiancraft-skills/asset-optimization.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00241 | $0.02100 |
| Opus 5 | $0.00120 | $0.01050 |
| Sonnet 5 | $0.00048 | $0.00420 |
| Haiku 4.5 | $0.00024 | $0.00210 |
Grade A, and why
asset-optimization 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Asset Optimization
The smallest asset that still serves its purpose. Measure the bytes, not the intent.
An asset is a media file whose bytes we shrink without changing what it is for. This skill is a lookup keyed on the asset's kind that decides format, tool, and whether the pass may lose information, so the file ends up as small as it can be while still doing its job on the surface it will be presented on.
Structure. Each kind is an executor under executors/<kind>/, a folder of standardized organs:
procedure.md (the how-to, including prerequisites and cross-kind redirects), cookbook.md (curated
verbatim recipes), targets.md (surface to format), and expectations.md (measured size data). The
cross-cutting references at the root are tools.md (the tool manifest, defined once because
one tool serves many kinds), surface.md (which surface), classify.md (how
to detect a file's kind), batch.md (repository operation, originals, idempotence, report),
and cookbook.md (the recipe rubric and an index of every kind's cookbook). This
two-level structure is deliberately heavier than the flat references/ layout of the repo's other
skills, because this skill has more orthogonal axes than any sibling: kind, surface, fidelity intent,
and tool.
Fidelity intent (decide first; it gates every tool)
| Intent | Meaning | Consequence |
|---|---|---|
| Lossless-required | a pixel, sample, path, or vertex is load-bearing (design fidelity, a diff, evidence) | only lossless tools; never quantize or re-encode lossy |
| Lossy-acceptable | the asset carries an impression, not exact bytes (walkthrough, delivery, thumbnail) | lossy tools are in play, tuned to "looks the same to the viewer who judges it" |
If compression would change what the asset is for, it is lossless-required by definition. Optimize for "looks exactly the same to the person who will judge it."
What ships with it
38 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.
- AGENTS.md 2.8 KB
- batch.md 4.8 KB
- classify.md 2.5 KB
- cookbook.md 3.0 KB
- executors/animation/cookbook.md 2.7 KB
- executors/animation/expectations.md 791 B
- executors/animation/procedure.md 1.5 KB
- executors/animation/targets.md 696 B
- executors/audio/cookbook.md 4.4 KB
- executors/audio/expectations.md 583 B
- executors/audio/procedure.md 1.4 KB
- executors/audio/targets.md 818 B
- executors/document/cookbook.md 1.9 KB
- executors/document/expectations.md 734 B
- executors/document/procedure.md 2.1 KB
- executors/document/targets.md 706 B
- executors/font/cookbook.md 2.4 KB
- executors/font/expectations.md 1005 B
- executors/font/procedure.md 1.5 KB
- executors/font/targets.md 856 B
- executors/model/cookbook.md 1.6 KB
- executors/model/expectations.md 728 B
- executors/model/procedure.md 1.4 KB
- executors/model/targets.md 803 B
- executors/raster/cookbook.md 5.2 KB
- executors/raster/expectations.md 786 B
- executors/raster/procedure.md 2.2 KB
- executors/raster/targets.md 1002 B
- executors/vector/cookbook.md 1.8 KB
- executors/vector/expectations.md 650 B
- executors/vector/procedure.md 1.5 KB
- executors/vector/targets.md 753 B
- executors/video/cookbook.md 4.8 KB
- executors/video/expectations.md 669 B
- executors/video/procedure.md 1.6 KB
- executors/video/targets.md 745 B
- surface.md 2.8 KB
- tools.md 15 KB
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.
- 10d ago First seen · 133 lines · 241 tokens per session scan A 8581fe0a1564
asset-optimization is a skill published in the GitHub repository simiancraft/simiancraft-skills (7 stars, last pushed 6d ago), licensed MIT. It adds 241 tokens to every session and 2,100 once invoked, about $0.0012 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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