Borrowing it
Nothing to install: this file belongs to layoutit/polycss. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/layoutit/polycss/main/.agents/skills/compat-hunter/SKILL.mdgit clone --depth 1 https://github.com/layoutit/polycssWrote 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/layoutit/polycss/compat-hunter)<a href="https://agentmods.dev/skills/layoutit/polycss/compat-hunter"><img src="https://agentmods.dev/badge/skills/layoutit/polycss/compat-hunter/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/layoutit/polycss/compat-hunter"><img src="https://agentmods.dev/badge/skills/layoutit/polycss/compat-hunter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00066 | $0.00974 |
| Opus 5.5 | $0.00026 | $0.00390 |
| Sonnet 5.5 | $0.00013 | $0.00195 |
| Haiku 4.5 | $0.00007 | $0.00097 |
Grade A, and why
compat-hunter 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 1mo 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 — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Compat Hunter
Use this skill when the user wants to keep digging for parser compatibility issues without building a fixed local corpus.
Workflow
-
In the repo, prefer the reusable script:
pnpm compat-hunter -- --max-models 2000Equivalent explicit form:
pnpm --filter @layoutit/polycss-core build node .agents/skills/compat-hunter/scripts/compat-hunter.mjs --max-models 2000 -
Let the script stream remote OBJ/GLB/glTF/VOX candidates, parse each model, and discard clean files. Reports are written under
bench/results/, which is ignored by git. -
Treat these as known non-actionable unless the user asks to support them:
- glTF POINTS/LINES/LINE_LOOP/LINE_STRIP primitives.
- Required Draco or meshopt compressed primitives skipped with a warning.
- STL source-quality diagnostics that the parser already handles: degenerate triangles, repaired winding, component orientation, non-manifold/shared-edge topology, supplied-normal mismatches, malformed normals/facets, overdeclared binary triangle counts, trailing binary bytes, and ignored non-Magics binary attribute bytes.
- Empty/corrupt STL containers with no complete triangle records or no valid ASCII facets.
-
Stop and inspect anything classified as:
throwunknown-warningobj-zero-no-warningglb-zero-no-warning
-
If an actionable parser issue is found, keep the saved file under the report's
interesting/directory, add a focused parser test using that behavior, implement the smallest fix, and rerun the focused parser tests plus the hunter on the saved file or source class.
Useful Commands
Fresh Objaverse and expanded GitHub stream:
pnpm compat-hunter -- --max-models 5000 --max-bytes 10mb --timeout-ms 30000
Objaverse only, later shards:
pnpm compat-hunter -- --sources objaverse --objaverse-shards 120:220 --max-models 5000
GitHub only:
pnpm compat-hunter -- --sources github --max-models 500
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.
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.
- 1mo ago First seen · 114 lines · 66 tokens per session scan A 7407423a5cee
compat-hunter is a skill published in the GitHub repository layoutit/polycss (771 stars, last pushed 2mo ago), licensed MIT. It adds 66 tokens to every session and 974 once invoked, about $0.0003 per session on Opus 5.5. 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.
Other skills, from other repositories
regression-suite
Map test coverage to GDD critical paths, find fixed bugs lacking regression tests, flag drift from new features.
soak-test
Soak test protocol for extended play — what to observe and log for slow leaks, fatigue, late-appearing edge cases.
playtest-report
Structured playtest report template, or turn existing playtest notes into structured feedback.
team-polish
Orchestrate the polish team — performance-analyst, technical-artist, sound-designer, qa-tester — to optimize and harden a feature or area.
smoke-check
Critical-path smoke gate before QA hand-off — runs the automated suite. A failed check means the build is not QA-ready.
develop-web-game
Use when Codex is building or iterating on a web game (HTML/JS) and needs a reliable development + testing loop: implement small changes, run a Playwright-based test script with short input bursts and intentional pauses, inspect screenshots/text, and review console errors with rendergametotext.