data-range-requests SKILL.md skillA
data-range-requests 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/data-range-requests@git:20261030.260706aPins git:20261030.260706a 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/data-range-requests/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261030.260706a, committed Oct 30, 2026
- First version recorded
- Oct 26, 2026
- Size
- 24,332 bytes
- Repository stars
- 24
- License
- GPL-3.0
How map engines read one big static file (PMTiles, GeoParquet, FlatGeobuf, COG, COPC, Zarr) by HTTP Range instead of downloading it, and how they lay such files out, cache, schedule and harden the reads. Load it when a map-from-scratch renderer will fetch data at run time by byte range, when designing a baked format meant to be range-read, when a Range read misbehaves (200 instead of 206, CORS preflight, 501 on a suffix range, offsets off after gzip, a stale archive), or when deciding whether…
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
# Reading data by HTTP Range A renderer that reads one static file by byte range needs no tile server, and a view costs only the bytes it shows. The price is latency. Every level of index is a sequential round trip before the first payload byte, hosts answer Range in ways that break naive readers, and a cache keyed by URL alone mixes up every range of the same file. A file that is not laid out for the view gives nothing back: pruning selects every block and the reader fetches the whole file in pieces. The engines below converge on one shape: a fixed-size or self-describing header, an index read lazily and cached within a bound, exact payload ranges, coalesced and cancellable requests, and a whole-file fallback that runs on purpose, not by accident. Per-engine detail is in [references/engines.md](references/engines.md). Which of the owner's hosts and files read well by Range is measured in the `yuiseki-open-data` skill [75]; this skill does not repeat it. ## Decide first: range-read, or fetch whole? - **Fetch whole below a size threshold.** ortho-earth converts a GeoParquet whole up to 8 MB and streams row groups only above it [41]; its own GeoPBF …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/data-range-requests@sha256:1a8e926a360b8219The line at the top of this page pins the label git:20261030.260706a, 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_44yogu6xa2blnruh)
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 30, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261030.260706a latest | 2026-10-30 | 260706a | 24,332 B | A | view · diff |
| git:20261026.79a684e | 2026-10-26 | 79a684e | 23,732 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 (24332 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_44yogu6xa2blnruh GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/data-range-requests GET https://markdownregistry.com/api/v1/blob/1a8e926a360b821981c231b156d9deebd2c27984de6e80a99aadcfbdc1b5cba8
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.