worker-threading SKILL.md skillA
worker-threading 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/worker-threading@git:20261027.231c915Pins git:20261027.231c915 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/worker-threading/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261027.231c915, committed Oct 27, 2026
- First version recorded
- Oct 26, 2026
- Size
- 28,122 bytes
- Repository stars
- 24
- License
- GPL-3.0
When map engines move work off the main or render thread (Web Workers, OffscreenCanvas, WASM threads, native thread pools), what they send across, how they size, start, cancel and recover workers, and what they reverted, distilled for a map-from-scratch renderer. Load it before adding a Worker, worker_threads, SharedArrayBuffer or a thread pool to a renderer or to bake.ts, when data must be decoded, triangulated or laid out at run time, when a bench shows main-thread jank during loading, or…
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
# Worker threading: what to move off the main thread, and what it costs A worker keeps the frame loop free while data is decoded, triangulated or laid out, but every engine that adopted workers then paid for them: transfer and message round trips, worker start-up and duplicated bundle code, cancellation and stale-result bugs, browser-specific leaks, and, with SharedArrayBuffer, a requirement on the host's HTTP headers. The 37 engines behind this skill also show the opposite case: work that moved back to the main thread, worker pools cut to one, and decode workers reverted because the network, not the CPU, was the bottleneck. The map-from-scratch rule is to do the work at bake time, so the renderer receives data laid out for exactly what it draws, and no example so far uses a worker [2]. Load this skill when that stops being enough. Per-engine detail, with more numbers, is in [references/engines.md](references/engines.md). Neighbouring skills: `tile-cache-and-loading` (scheduling, cancellation and caches), `data-range-requests` (Range reads), `label-placement` (where collision runs), `polygon-triangulation`, `raster-tiles` (image decoding) and …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/worker-threading@sha256:3f63d87c83280750The line at the top of this page pins the label git:20261027.231c915, 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_yorv5ovjyfyneuf2)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 26, 2026 and Oct 27, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261027.231c915 latest | 2026-10-27 | 231c915 | 28,122 B | A | view · diff |
| git:20261026.79a684e | 2026-10-26 | 79a684e | 28,120 B | A | view |
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 (28122 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_yorv5ovjyfyneuf2 GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/worker-threading GET https://markdownregistry.com/api/v1/blob/3f63d87c83280750553630fe40642b7e192d22a56db4e6c34d2db46476f43992
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.