api-design-and-extensibility SKILL.md skillA
api-design-and-extensibility 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/api-design-and-extensibility@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/api-design-and-extensibility/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261027.231c915, committed Oct 27, 2026
- First version recorded
- Oct 26, 2026
- Size
- 33,007 bytes
- Repository stars
- 24
- License
- GPL-3.0
What 40-odd map engines learnt about how much surface a renderer should expose (graphics backends, options, plugin hooks, data handed across worker/WASM/JNI boundaries, mutability, embedding constraints, integration with another engine) and which of those surfaces they later cut. Load it when a map-from-scratch request asks for a renderer to be embedded in someone else's page or app, reused as a small library, given options, layers, overlays or a plugin hook, fed data by host code, laid over…
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
# API design and extensibility: how much surface to give a renderer A general engine is a public API first: every option, backend, layer type and plugin hook is a promise it must keep across versions, and most of the history mined here is engines paying for promises they made too early. They kept two graphics backends alive, exposed internals, accepted any data shape and deep-compared it, let callers mutate geometry every frame, and then spent major versions taking it back. A map-from-scratch renderer serves one request, so most of this surface should not exist: `spec.yaml` is its contract, `architecture_selection.not_doing` is its scope, and the baked file is its data API [112]. This skill is for the moments when some surface is still needed (an embed, a host app feeding data, an overlay, an option the request asks for) and for resisting surface that is not. Per-engine detail is in [references/engines.md](references/engines.md); the numbers in brackets point to the Sources list at the end of this file. Neighbouring skills go deeper on parts of this: `vector-tile-encoding` (format versioning), `data-range-requests` …
Read the whole file at its exact version.
How to install
mdr add yuiseki/map-from-scratch/api-design-and-extensibility@sha256:afb658945e058f53The 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_snjw7o7sjjf7fwmp)
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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 | 33,007 B | A | view · diff |
| git:20261026.79a684e | 2026-10-26 | 79a684e | 33,005 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 (33007 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_snjw7o7sjjf7fwmp GET https://markdownregistry.com/api/v1/resolve?ref=yuiseki/map-from-scratch/api-design-and-extensibility GET https://markdownregistry.com/api/v1/blob/afb658945e058f5318e77f919d63690cec19a132d542eaa3e715d9b3689f80a4
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.