runtime-internals SKILL.md skillA
runtime-internals from jasonxudeveloper/nino is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jasonxudeveloper/nino/runtime-internals@git:20261027.bf64f38Pins git:20261027.bf64f38 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jasonxudeveloper/nino
- Path
.claude/skills/runtime-internals/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261027.bf64f38, committed Oct 27, 2026
- Size
- 4,089 bytes
- Repository stars
- 652
- License
- MIT
How Nino reads and builds a runtime's own objects through their fields instead of the public API - CollectionViews (List, HashSet, Dictionary layouts per runtime), mirror classes and ObjectTypes.Retype, ImmutableDictionary/ImmutableHashSet trees (HashTrees), SortedSet red-black trees, LinkedList rings, ConcurrentDictionary buckets - with startup checks, public-API fallbacks and the FastPaths tests. Use when adding or changing such a path, when a collection reads or writes wrong on Mono…
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
# Runtime internals ## Reading a runtime's collections through their fields A path through a runtime's internals (`CollectionViews`: the fields of `List<T>`, `HashSet<T>`, `Dictionary<TKey, TValue>`, ...) declares a layout for each implementation (.NET 64-bit and 32-bit, .NET Framework, Mono), checks it against an instance with known contents at startup and uses the public API when none matches. Keep the fallback (the enumerator) out of line. Run the tests on .NET, the `net472` build under Mono and the `linux-arm` and `linux-arm64` builds under qemu (`platforms`). ## Building a runtime's objects without its public API `Nino.Immutable/HashTrees.cs` (an `ImmutableDictionary` or `ImmutableHashSet` built as its tree, instead of one builder `Add` at a time); `SortedSetNodes` in Nino.Core (a `SortedSet<T>`'s red-black tree); `ReadLinked` (a `LinkedList<T>`'s ring of nodes); `ConcurrentTables.Builder` (a `ConcurrentDictionary`'s bucket chains). One way for every runtime where one works, and a separate way per runtime (behind `#if` or a startup check) only where none does. What works everywhere so far: …
Read the whole file at its exact version.
How to install
mdr add jasonxudeveloper/nino/runtime-internals@sha256:6f2e10e927986c3dThe line at the top of this page pins the label git:20261027.bf64f38, 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_rpnelvey5d2ffiuc)
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Versions
The registry has recorded 1 version of this file, committed on Oct 27, 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 (4089 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
jasonxudeveloper/nino · 652 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rpnelvey5d2ffiuc GET https://markdownregistry.com/api/v1/resolve?ref=jasonxudeveloper/nino/runtime-internals GET https://markdownregistry.com/api/v1/blob/6f2e10e927986c3d4a6fbb539cf62e72b05bd5726a48c5986ceb0871ae5ece84
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.