style-and-expressions SKILL.md skillA
style-and-expressions from yuiseki/map-from-scratch is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add yuiseki/map-from-scratch/style-and-expressions@git:20261026.79a684ePins git:20261026.79a684e in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- yuiseki/map-from-scratch
- Path
.agents/skills/style-and-expressions/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261026.79a684e, committed Oct 26, 2026
- Size
- 31,446 bytes
- Repository stars
- 24
- License
- GPL-3.0
How map engines turn a style (rules, filters, zoom stops, data-driven expressions, feature state) into colours, widths and visibility, where they evaluate it (bake time, tile build, per frame, in the shader), and what each choice cost them. Load it when a map-from-scratch request colours or filters features by attribute or zoom, must reproduce a MapLibre/Mapbox, MapCSS or SLD style, needs run-time restyling, highlighting, hover state or time/threshold filtering, or when style evaluation shows…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Style and expressions: resolve the style before the renderer sees the data A style maps each feature, at each zoom, to "draw or not, in which pass, with which colour, width and pattern". General engines receive the style at run time, so they parse it, interpret filters and expressions per feature in a worker or tile builder, keep an attribute bag per feature for the interpreter to read, and spend years making that interpreter cheaper. Most of that machinery exists because the style is unknown until run time and may change. A renderer made for one request usually knows its style when it bakes the data. The decisions are then: which parts of the style really must stay live (restyle, highlight, a time slider, continuous zoom interpolation), how to keep those few on the GPU, and how to carry the reference renderer's semantics correctly if a third-party style is the source. Per-engine detail and smaller decisions: [references/engines.md](references/engines.md). Numbers in brackets refer to the Sources list at the end of this file. ## First question: what must stay live? | The request | Where style is resolved | Engines that show the cost of the other way | | --- | --- | --- | …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/style-and-expressions@sha256:156adcd19a118d73The line at the top of this page pins the label git:20261026.79a684e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_jd5ppweqj7skieef)
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Versions
The registry has recorded 1 version of this file, committed on Oct 26, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (31446 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
yuiseki/map-from-scratch · 24 stars · license GPL-3.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jd5ppweqj7skieef GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/style-and-expressions GET https://markdownregistry.com/api/v1/blob/156adcd19a118d73971d9809df97da051731166d8cd1b9aef3f547903061f1cc
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.