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 playcanvas/create-playcanvas --skill override-shader-chunksgit clone --depth 1 https://github.com/playcanvas/create-playcanvasWrote 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/playcanvas/create-playcanvas/override-shader-chunks)<a href="https://agentmods.dev/skills/playcanvas/create-playcanvas/override-shader-chunks"><img src="https://agentmods.dev/badge/skills/playcanvas/create-playcanvas/override-shader-chunks/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/playcanvas/create-playcanvas/override-shader-chunks"><img src="https://agentmods.dev/badge/skills/playcanvas/create-playcanvas/override-shader-chunks.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 | $0.00036 | $0.00390 |
| Opus 5.5 | $0.00014 | $0.00156 |
| Sonnet 5.5 | $0.00007 | $0.00078 |
| Haiku 4.5 | $0.00004 | $0.00039 |
Grade A, and why
override-shader-chunks 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 23d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- override-shader-chunks — 100% identical, 0 lines differ
What it actually says
Override shader chunks
Overriding a StandardMaterial chunk keeps fog, tone mapping, shadows, skinning, and instancing
intact. Use a ShaderMaterial only when the look needs its own vertex and fragment pair.
- Set
material.shaderChunksVersionto the installed major.minor, such as'2.23'. Chunk names and contracts change between versions, so read the installed chunk source, not memory. - Set chunks with
material.getShaderChunks(SHADERLANGUAGE_GLSL).set(name, source)and the WGSL equivalent, then callmaterial.update(). For every material on a device, useShaderChunks.get(device, language); the globalshaderChunksobject is deprecated. - Supply both GLSL and WGSL. On WebGPU, one GLSL-only chunk sends the whole shader through a transpiler that is usually not loaded, so it fails to compile. Otherwise pin the device to WebGL.
- Clone shared materials, including imported ones, before overriding them for only some meshes.
Per-mesh uniforms use
meshInstance.setParameter(). - Uniforms are raw; convert sRGB colours with
Color#linear(). - Vertex chunks that read the model matrix, such as
transformCoreVS, must keep theINSTANCINGpath with amatrix_modelfallback, like the stock chunk. - Expand mesh bounds by the maximum displacement; CPU bounds do not see shader deformation.
- For an emissive-only look, implement
getEmission()writingdEmission, zerodiffuseandspecular, and disableuseSkybox.
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.
- 23d ago Changed d221704d2d4a
- 24d ago Changed · -40 lines · -8 tokens per session df8c173428ad
- 26d ago Changed · +6 lines 87b377b5d831
- 1mo ago First seen · 60 lines · 44 tokens per session scan A f34f489232ff
override-shader-chunks is a skill published in the GitHub repository playcanvas/create-playcanvas (61 stars, last pushed today), licensed MIT. It adds 36 tokens to every session and 390 once invoked, about $0.0001 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.
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